KUBOTA U15 MICRO EXCAVATOR Service Repair Manual

WORKSHOP MANUAL
KUBOTA EXCAVATOR
U15
Code No.97899-61282
Service Chapter
U15-3

CONTENTS
V Electrical system
IV Hydraulic System
III Engine
II Machine Body
I General

WSM U15, U15-3 Service
I-S-1
I. General
A.Body and engine identification marks . . . . . . . . . . . . . I-S-3
B.Safety precautions for servicing, disassembly and reassembly . . I-S-4
a. Safety measures before starting work. . . . . . . . . . . . . . . . . . . I-S-4
b. Safety measures during work . . . . . . . . . . . . . . . . . . . . . . . . . I-S-4
c. Preparation for disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-5
d. Precautions for disassembly and reassembly. . . . . . . . . . . . . I-S-5
C.Important Safety process and critical functional process. . I-S-6
a. Essential Adhesives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-6
b. Important Safety Process .. . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-6
c. Important Critical Functional Process . . . . . . . . . . . . . . . . . . I-S-6
D.Important inspection items after reassembling . . . . . . I-S-6
a. Operate the Machine and check for Unusual Noise and Vibrations. . . . I-S-6
b. Make Sure the Safety decals and Wireharness Clamps are in their
Specified Positions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-6
c. With the Machine Front in a Specified Posture, Check the Amount of
Hydrauric Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-6
d. Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-7
E.Maintenance intervals . . . . . . . . . . . . . . . . . . . . . . . . I-S-12
a. EU version. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-12
b. PP (KTC, KCL)-version. . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-15
b-1. KTA-version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-16-1
c. Hydraulic Oil Check for machines with Hydraulic Breakers . I-S-16-2
d. Maintenance items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-17
e. Troubleshooting for operators. . . . . . . . . . . . . . . . . . . . . . . . I-S-19
f. Periodic replacement of important component parts. . . . . . . I-S-20
g. Recommend oils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-21
h. Lifting capacity : U15-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-22
F.Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-23
a. Machine Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-23
b. Main Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-23
c. Lever stroke and operating force . . . . . . . . . . . . . . . . . . . . . I-S-24
d. Dimensions of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-25
e. Quality specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-34
Note : PP - version = Pan Pacific - version = KTC, KCL, KTA - version

I-S-3
A.Body and engine identification marks
(1) Machine serial number
(2) Engine serial number
e.g. D782 5L0023
“5” indicates year of 2005 and “L” indicates June.
So, 5L indicates that the engine was manufactured
in June 2005.
Model Serial No.
Excavator
Engine
Dealer's name
(To be filled in through the owner)
If trouble should occur during use, or if servicing is
necessary, contact the dealer who handles the
machine. At that time please inform the machine
model and engine type and serial numbers.
Name plate : Code No. RA018-57721
EU - version
U15-3Machine model
Serial No.
Engine No.
PRODUCT IDENTIFICATION No. >JKUU0153*00S40001<
40001
4
3
2
1
1
No. Items Contents ; Example
2
3
4
RA018-5772
PRODUCT
IDENTIFICATION
NUMBER
ENGINE No.
SERIAL No.
MODEL
2-47,Shikitsuhigasi1-Chome,Naniwa-ku,Osaka,556-8601JAPAN
Example : S/N 40001
(1) Serial No.
(1) Engine serial No.

I-S-4
B.Safety precautions for servicing, disassembly and reassembly
Safety precautions for servicing
Most accidents during servicing arise from carelessness. Please remember that Safety involves both the
welfare of the employees and improved work efficiency.
Safety precautions for Disassembly and reassembly
Machines must be diassembled and assembled efficiently and safely.
It is very important to thoroughly understand the construction and function of the machine, to make all appro-
priate preparations, and start operations according to the specified working procedures.
a. Safety measures before starting work
(1)Work clothes
1. Wear specified work cap and clothed.
(Under no circumstances may workers wear
undershirts only.)
Cuffs must be kept buttoned, and any tears
must be mended.)
2. Wear safety shoes.
3. Do not wear cotton gloves when working on
the internal section of engine, reduction
gears or hydrauricunits for repair or others,
or when using a hammer. Wear leather
gloves, however, when hoisting wires.
(2)Inspecting equipment and tools
1. Prepare equipment (cranes, fork lifts, tool,
etc.) required for servicing and inspect for
any problems before starting work.
2. Hammer heads (metal parts) must be firmly
secured to their handles.
3. Check hosting tools (wire ropes, hoisting
chains, etc.) before use.
(3)Keep workshop in order
1. Secure appropriate space needed for disas-
sembly to the job.
2. Secure a clean, safe place for arranging dis-
assembled parts.
3. Store volatile substances (gasoline, light oil,
thinner, oily articles, etc.) in appropriate con-
tainers at selected locations to prevent fire
hazards.
b. Safety measures during work
(1)Protectors
1. Wear goggles when using chisels for chip-
ping.
2. Use appropriate protectors during welding.
3. Wear a helmet when working with a crane or
at elevated locations.
(2)Team work
1. When working with two or more people,
divide the work and maintain close commu-
nication.
2. Clane work must be carried out using prede-
termined signals.
(3)Disassembly and assembly
1. Do not wear gloves when using hammers.
2. Use rods of the specified soft material for
removing pins. Do not use a hammer as a
pad.
3. Do not place fingers in holes when center-
ing.
4. Heavy parts must be adequately supported
before removingbolts.
(4)Cranes
1. In principle, use a crane for objects heavier
than 44lb (20kg).
2. Crane operation and hoisting must be per-
formed only by qualified personal.
3. Pay careful attention to the center of gravity
when hoisting, and do not stand under the
lifted objects.
(5)Others
1. To work under a jacked-up carrier, be sure to
place wood pieces under it.
2. When charging batteris, make sure there
are no open flames in the immediate vicinity.
3. All electric tools must be grounded.
4. Before welding the machine, remove the
battery.
• When removing the battery, be sure to dis-
connect negative (-) cord first.
• When mounting the battery, be sure tp
connect the positive (+) cord first.

I-S-5
c. Preparation for disassembly
(1)Cleaning
Remove mud and dirt from the body before disassembly.
(2)Acceptance inspection
The machine must be checked before it is disassembled to record existing conditions, such as those
listed below.
Model, serial number, and hourmeter reading
• Reason for repair and repair history
• Element stains
• Fuel and oil condition
• Parts damage *(Take photographs if necessary.)
(3)Equipment and tools
prepare equipment, tools, cranes and parts storage racks as required.
d. Precautions for disassembly and reassembly
(1)Disassembly
1. Follow the specified disassembly procedures.
2. Make alignment marks to insure correct reassembly.
3. Arrange disassembled parts in an orderly way, and attach identification tags or put marks if needed.
(2)Reassembly
1. Clean all parts before assembly. Repair any scratches or dents. Take special precautions against dirt
and dust.
2. Parts with rust-preventive coatings must be assembles only after removing the corting.
3. Separated parts must be correctly reassembled using alignment marks.
4. As a rule, use a press to reassembled bearings, bushing and oil seals. Use pads when using a ham-
mer.
e. Maintenance
CAUTION
When adding oil and servicing
1. Park the machine on a large, flat place.
2. Place the bucket and dozer on the ground.
3. Stop the engine
4. Move the attachment control lever and dozer lever to make sure the remaining pressure is relieved.
5. Draw out the starter key and check around the machine for safety.
Before starting the job, carefully read the Operational Manual in " ! Servicing Precautions" on the yellow
pages.
f. Waste Disposal
WARNING
Do not carelessly throw away and burn waste materials. Such actions may lead to environmental pollu-
tion and punishment by local laws.
When disposing of waste:
* Let out waste fluid from the machine into a container.
* Do not let waste fluid flow on the ground as well as into a river, lake, marsh, and sea.
* Contact your dealer or a qualified industrial waste handler to treat (dispose of or incinerate) harmful
waste materials. Those materials include waste oil, fuel, cooling water (anti-freeze), coolant, solvent,
filters, batteries, rubber and other toxic substances.

I-S-6
C.Important Safety process and critical functional process
The following instructions are related to essential adhesives, important safety process and critical func-
tional process .Pay special attention in servicing these process. (Pay also close attention in reconnecting
the electrical cables.)
a. Essential Adhesives
Type of screw adhesive
• Unless otherwise specified, use Three-Bond 1324 adhesive (medium-duty type).
Keep the screw threads free of oil and water.
Type of instantaneous adhesive
• Use Three-Bond 1733 or Three-Bond 1741E adhesive.
Keep the bond areas free of oil and water.
b. Important Safety Process .
1. Reconnecting the fuel hose (clearance, hose routes, clamps, etc.)
2. Electrical cabling (engine, instrument panal, controls, etc.) (wiring routes, clamps and couplers)
c. Important Critical Functional Process .
1. Setting up the travel wheel motor (tightening torque)
2. Reassembling the rotary joints (joint direction and shaft set-up)
3. Installing the swivel base bearing and the swivel motor (tightening torque)
4. Fitting the pump couplings (tightening torque)
D.Important inspection items after reassembling
a. Operate the Machine and check for Unusual Noise and Vibrations.
b. Make Sure the Safety decals and Wireharness Clamps are in their
Specified Positions.
c. With the Machine Front in a Specified Posture, Check the Amount of
Hydrauric Oil
Checking the oil level (For further datails, refer to the Operator’s Manual of each model.)
1) Park the machine on a level ground.
2) Make sure the hydrauric oil temperature is in the range of 10-30°C (50-86°F) and see if the oil level is
within the specified zone of the oil level gauge.
3) Extend the track cyrinder to Max. position.
4) Keep the machine front as shown as following posture.
Posture: Extend the rods of the arm and bucket cylinders to max. Place the bucket link on the ground, the
offset swing at the center, and the dozer also on the ground.
S
A
S
A
Leftward
swinging
Some space needed
Specified
machine posture
Red circle
Oil gauge (level)

I-S-7
d. Piping
(1)General precautions
• Tightening the pipe socket to the specified torque. If too tight, the socket itself or a hydraulic component
may get damaged. It too loose, an oil leak may result.
• In connecting a new hose or pipe, tighten its nut first to the specified torque and then turn it back (about
45°). Then tighten it again to the specified torque. (Do not this to the sealing tape-applied hose or pipe.)
• When disconnecting a vertical hose or pipe, separate its bottom connection first.
• In desconnecting and reconnecting the hose and pipe, be sure to use two wrenches. With one wrench,
restrain the mating part to allow no twist.
• Check the mating connector’s sleeve and the hose’s taper for dust deposits and scratches.
• When the pipe socket has been tightened up, wipe the joint clean. Apply the maximum operating pres-
sure 2 or 3 times to make sure there is no oil leak.
(2)Hydraulic hose
Check the hydraulic hose for too tight a connect or twist.
* Excessivly tight contact
Let’s suppose that a hose is in contact with another hose or other part. If the hose is pulled away by a force
of 2 kg but still in contact, it means the contact is too tight.
(3)Precautions in tightening the bolts and nuts
• Use bolts of specified length.
• Do not over tighten the bolts: Its threads may get deformed or the fixed part may get damaged. Do not
undertighten the bolt either: It may get loose.
• In other words, tighten the bolt to the specified torqoe.
• Tighten the bolts and nuts diagonally for even tightness.
R (Tapered thread)
G (Straight thread)
Nut
Sleeve
Steel pipe Union nut Tapered thread
Joint body

I-S-8
(4)Hose screw
(5)Joint bodies
Thread size
(piping screw)
Tightening torque
N·m
kgf·m
ft·lbf
Wrench size
(reference)
Union nut section
Taper thread
section
1/8”
7.8 ~ 11.8 N·m
0.8 ~ 1.2 kgf·m
5.8 ~ 8.7 ft·lbf
14.71 ~ 19.61 N·m
1.5 ~ 20 kgf·m
10.85 ~ 14.47 ft·lbf
17 mm
0.67 in
1/4”
24.5 ~ 29.4
2.5 ~ 3.0
18.1 ~ 21.7
36.3 ~ 44.1
3.7 ~ 4.5
26.8 ~ 32.5
19 mm
0.75 in
3/8”
49.0 ~ 53.9
5.0 ~ 5.5
36.2 ~ 39.8
49.0 ~ 68.6
5.0 ~ 7.0
36.2 ~ 50.6
22 mm
0.87 in
1/2”
58.8 ~ 63.7
6.0 ~ 6.5
43.4 ~ 47.0
83.4 ~ 88.3
8.5 ~ 9.0
61.5 ~ 65.1
27 mm
1.06 in
3/4”
117.7 ~ 127.5
12.0 ~ 13.0
86.8 ~ 94.0
127.5 ~ 147.1
13.0 ~ 15.0
94.0 ~ 108.5
36 mm
1.42 in
1”
137.3 ~ 147.1
14.0 ~ 15.0
101.3 ~ 108.5
147.1 ~ 166.7
15.0 ~ 17.0
108.5 ~ 123.0
41 mm
1.61 in
Thread size
(piping screw)
Tightening torque
N·m
kgf·m
ft·lbf
Spanner size
(reference)
Remarks
Steel pipe (OD)
R (tapered thread) G (straight thread)
1/8”
19.6 ~ 29.4 N·m
2.0 ~ 3.0 kgf·m
14.5 ~ 21.7 ft·lbf
-
17 mm
0.67 in
When in
steel pipe is
in use.
8 mm
0.31 in
1/4”
36.3 ~ 44.1
3.7 ~ 4.5
26.8 ~ 32.5
W/O-ring
Joint Torque
58.8 ~ 78.5
6 ~ 8
43.4 ~ 57.9
19 mm
0.75 in
12 mm
0.47 in
3/8”
39.2 ~ 49.0
4.0 ~ 5.0
28.9 ~ 36.2
W/O-ring
Joint Torque
78.5 ~ 98.1
8 ~ 10
57.9 ~ 72.3
23 mm
0.91 in
15 mm
0.59 in
1/2”
49.0 ~ 68.6
5.0 ~ 7.0
36.2 ~ 50.6
W/O-ring
Joint Torque
117.7 ~ 137.3
12 ~ 14
86.8 ~ 101.3
26 mm
1.02 in
16 mm
0.63 in
Metric Size Hose
Thread size
(piping screw)
Torque
N·m
kgf·m
ft·lbf
M12 × 1.5
20 ~ 30
2.0 ~ 3.1
14.75 ~ 22.13
M14 × 1.5
20 ~ 30
2.0 ~ 3.1
14.75 ~ 22.13
M16 × 1.5
30 ~ 50
3.1 ~ 5.1
22.13 ~ 36.9
M18 × 1.5
30 ~ 50
3.1 ~ 5.1
22.13 ~ 36.9
M22 × 1.5
40 ~ 60
4.1 ~ 6.1
29.5 ~ 44.25

I-S-9
(6)Tightening torque table for hose clamp (Screw type)
(7)Nuts for piping
No. Dia. (mm) Code No.
Tightening torque
N·m
kgf·m
ft·lbf
1 Ø12 ~ 16 09318-89016
2.5 ~ 3.4
25 ~ 35
1.84 ~ 2.51
2 Ø19 ~ 25 09318-89024
3 Ø31 ~ 40 09318-89039
4 Ø36 ~ 46 09318-89045
5 Ø15 ~ 25 RC101-64580 4.9 ~ 5.9
50 ~ 60
3.61 ~ 4.356 Ø26 ~ 38 68311-72820
7 Ø13 ~ 20 RB101-63630
3.4 ~ 4.4
35 ~ 45
2.58 ~ 3.31
8 Ø40 ~ 55 RC411-63180
4.9 ~ 5.9
50 ~ 60
3.61 ~ 4.35
9 Ø77 ~ 95 69284-63170
10 Ø50 ~ 60 RC401-63190
11 Ø32 ~ 44 RD411-63820
12 Ø32 ~ 51 68311-72830
Steel pipe size
(O.D. × I.D. ×
Thickness)
Tightening torque
N·m
kgf·m
ft·lbf
Spanner size
(reference)
Remarks
8 × 6 × 1 mm
0.31 × 0.24 × 0.04 in
29.4 ~ 39.2
3.0 ~ 4.0
21.7 ~ 28.9
17 mm
0.67 in
When sleeve nut is
in use.
10 × 7 × 1.5 mm
0.39 × 0.28 × 0.06 in
39.2 ~ 44.1
4.0 ~ 4.5
28.9 ~ 32.5
19 mm
0.75 in
12 × 9 × 1.5 mm
0.47 × 0.35 × 0.06 in
53.9 ~ 63.7
5.5 ~ 6.5
39.7 ~ 47.0
21 mm
0.83 in
16 × 12 × 2 mm
0.63 × 0.47 × 0.08 in
88.3 ~ 98.1
9.0 ~ 10.0
65.1 ~ 72.3
29 mm
1.14 in
18 × 14 × 2 mm
0.71 × 0.55 × 0.08 in
127.5 ~ 137.3
13.0 ~ 14.0
94.0 ~ 101.3
32 mm
1.26 in
27.2 × 21.6 × 2.8 mm
1.07 × 0.85 × 0.11 in
235.4 ~ 254.97
24.0 ~ 16.0
173.6 ~ 188.1
41 mm
1.61 in

I-S-10
(8)Tightening torque of bolts and nuts
Refer to the tightness torque table below.
(9)Types and materials of bolts and nuts
[ex. bolts]
Bolts, Nuts
Nomial Dia.
4T 7T 9T
SS41 S40C, S45C SCr4
M6
7.8 ~ 9.3 N·m
0.80 ~ 0.95 kgf·m
5.8 ~ 6.9 ft·lbf
9.8 ~ 11.3 N·m
1.00 ~ 1.15 kgf·m
7.2 ~ 8.3 ft·lbf
12.3 ~ 14.2 N·m
1.25 ~ 1.45 kgf·m
9.0 ~ 10.5 ft·lbf
M8
17.7 ~ 20.6 N·m
1.80 ~ 2.10 kgf·m
13.0 ~ 15.2 ft·lbf
23.5 ~ 27.5 N·m
2.40 ~ 2.80 kgf·m
17.4 ~ 20.3 ft·lbf
29.4 ~ 34.3 N·m
3.00 ~ 3.50 kgf·m
21.7 ~ 25.3 ft·lbf
M10
39.2 ~ 45.1 N·m
4.00 ~ 4.60 kgf·m
28.9 ~ 33.3 ft·lbf
48.0 ~ 55.9 N·m
4.90 ~ 5.70 kgf·m
35.4 ~ 41.2 ft·lbf
60.8 ~ 70.6 N·m
6.20 ~ 7.20 kgf·m
44.8 ~ 52.1 ft·lbf
M12
62.8 ~ 72.6 N·m
6.40 ~ 7.40 kgf·m
46.3 ~ 53.5 ft·lbf
77.5 ~ 90.2 N·m
7.90 ~ 9.20 kgf·m
57.1 ~ 66.5 ft·lbf
103.0 ~ 117.7 N·m
10.50 ~ 12.00 kgf·m
75.9~ 86.8 ft·lbf
M14
107.9 ~ 125.5 N·m
11.00 ~ 12.80 kgf·m
79.6 ~ 92.6 ft·lbf
123.6 ~ 147.1 N·m
12.60 ~ 15.0 kgf·m
91.1 ~ 108.5 ft·lbf
166.7 ~ 196.1 N·m
17.00 ~ 20.00 kgf·m
123.0 ~ 144.7 ft·lbf
M16
166.7 ~ 191.2 N·m
17.00 ~ 19.50 kgf·m
123.0 ~ 141.0 ft·lbf
196.1 ~ 225.6 N·m
20.00 ~ 23.00 kgf·m
144.7 ~ 166.4 ft·lbf
259.9 ~ 304.0 N·m
26.50 ~ 31.00 kgf·m
191.7 ~ 224.2 ft·lbf
M18
245.2 ~ 284.4 N·m
25.00 ~ 29.0 kgf·m
180.8 ~ 209.7 ft·lbf
274.6 ~ 318.7 N·m
28.00 ~ 32.50 kgf·m
202.5 ~ 235.1 ft·lbf
343.2~ 402.1 N·m
35.00 ~ 41.00 kgf·m
253.2 ~ 296.5 ft·lbf
M20
333.4~ 392.2 N·m
34.00 ~ 40.00 kgf·m
245.9 ~ 389.3 ft·lbf
367.7 ~ 431.5 N·m
37.50 ~ 44.0 kgf·m
271.2 ~ 318.2 ft·lbf
519.8 ~ 568.8 N·m
53.00 ~ 58.00 kgf·m
383.3 ~ 419.5 ft·lbf
Types Material Tensile strength Hardness Bolt head marking
4T SS41
Over 392 MPa
4000 kgf/cm2
56892 lbf/in2
HRB
62 ~ 98
No mark or marked 4
7T
S40C
S45C
Over 686 MPa
7000 kgf/cm2
99561 lbf/in2
HRC
20 ~ 28
Marked 7
9T SCr4
Over 882 MPa
9000 kgf/cm2
128007 lbf/in2
HRC
28 ~ 34
Marked 9

I-S-11
(10)Washer-equipped elbow
Tightening torque
Tightening procedure
1) Connecting with the valve
• Screw in the elbow by hand until the washer comes
into contact.
Note:Clean up hte mating seal boforehand.
2) Positioning
• Turn the elbow back to its set position.
Note:Do not make any more than one turn back.
3) Fixing
• Tighten up the lock nut with a wrench.
• Lock nut tightening torque
G1/4:25 ~ 30 N·m (2.5 ~ 3.0 kgf·m, 18 ~ 22 ft·lbs)
G3/8:50 ~ 55 N·m (5.0 ~ 5.5 kgf·m, 36 ~ 40 ft·lbs)
G1/2:60 ~ 65 N·m (6.0 ~ 6.5 kgf·m, 43 ~ 47 ft·lbs)
G3/4:118 ~ 127 N·m (12.0 ~ 13.0 kgf·m, 87 ~ 94 ft·lbs)
G1:118 ~ 127 N·m (12.0 ~ 13.0 kgf·m, 87 ~ 94 ft·lbs)
(11)Adhesives
1. Thread adhesive
* No oil and water allowed on the threads.
* No oil and water allowed on the threads.
2. Radiator hose sealant
Size N·m kgf·m ft·lbs
G1/4 25 ~ 30 2.5 ~ 3.0 18 ~ 22
G3/8 49 ~ 54 5.0 ~ 5.5 36 ~ 40
G1/2 59 ~ 64 6.0 ~ 6.5 43 ~ 47
G3/4
G1
118 ~ 127 12.0 ~ 13.0 87 ~ 94
Types of thread adhesive
Loctite 271 or equivalent (heavy-duty)
ThreeBond 1305P or equivalent (heavy-duty)
ThreeBond TB1401B or equivalent (light-duty)
ThreeBond 1324 (medium-duty) unless otherwise specified
Type of instant adhesive ThreeBond 1733 or 1741E
Sealant ThreeBond #1208E or equivalent

I-S-12
E.Maintenance intervals
a. EU version
[Operator servicing]
1.) Under dusty conditions the air filter must be cleaned more frequently or replaced.
Elapsed hours of operationGeneral maintenance
50 100 150 200 250 300 350 400 450 500 Interval
Checking the engine oil level daily
Check hydraulic oil level daily
Check fuel level daily
Check coolant level daily
Lubricate front-end
attachments
daily
Checking the radiator and oil
cooler
daily
Check electric cables and
connections
daily
Check water separator daily
Check V-belt daily
Drain water from the fuel
reservoir
500 h
Lubricate the swivel gear 50 h
Battery service 50 h
Tracks and chassis: clean,
visually inspect and check
tension
weekly
(50 h)
Check nuts and bolts 100 h
Check, clean air filter 1.) 200 h
Grease the swivel bearing 200 h

I-S-13
[Operator servicing]
Elapsed hours of operationGeneral maintenance
550 600 650 700 750 800 850 900 950 1000 Interval
Checking the engine oil level daily
Check hydraulic oil level daily
Check fuel level daily
Check coolant level daily
Lubricate front-end
attachments
daily
Checking the radiator and oil
cooler
daily
connections
daily
Check water separator daily
Check V-belt daily
Drain water from the fuel
reservoir
500 h
Lubricate the swivel gear 50 h
Battery service 50 h
Tracks and chassis: clean,
visually inspect and check
tension
weekly
(50 h)
Check nuts and bolts 100 h
Check, clean air filter 1.) 200 h
Grease the swivel bearing 200 h

I-S-13-1
[Servicing by skilled personnel or KUBOTA dealer]
* The servicing identified with must be carried out after the specified hours of operation after initial
operation have been reached.
2.) When using a hydraulic hammer over 20% → every 800 h.
When using a hydraulic hammer over 40% → every 400 h.
3.) When using a hydraulic hammer up to 50% → every 200 h.
Replace the return filter approximately 250 hours after the initial operation.
4.) Earlier if necessary.
Elapsed hours of operation *Servicing
50 100 150 200 250 300 350 400 450 500 Interval
Check/adjust V-belt tension 250 h
Check coolant hoses and
clamps
250 h
Grease pilot valve linkage 250 h
Change engine oil and oil
filter
500 h
Replace the fuel filter 4.) 500 h
Change return filter for the
hydraulic oil tank 3.) Please contact your KUBOTA dealer.
500 h
Replace the drive unit oil 500 h
Change hydraulic oil and
suction filter 2.)
Please contact your KUBOTA dealer. 1000 h
Replace the in-line filter Please contact your KUBOTA dealer. 1000 h
Replace the air filter elements
).1
1000 h
Change running gear and
track roller oil
Check alternator and starter
motor
connections
Please contact your KUBOTA dealer. Annually
Safety inspection Annually
Replace the coolant and rinse
the cooling system
every 2
years
Replace coolant hoses and
clamps Please contact your KUBOTA dealer.
250 h
Change hydraulic hoses Please contact your KUBOTA dealer.
every 6
years

I-S-14
[Servicing by skilled personnel or KUBOTA dealer]
2.) When using a hydraulic hammer over 20% → every 800 h.
3.) When using a hydraulic hammer up to 50% → every 200 h.
4.) Earlier if necessary.
Elapsed hours of operationServicing
550 600 650 700 750 800 850 900 950 1000 Interval
Check/adjust V-belt tension 250 h
Check coolant hoses and
clamps
250 h
Grease pilot valve linkage 250 h
Change engine oil and oil
filter
500 h
Replace the fuel filter 4.) 500 h
Change return filter for the
hydraulic oil tank 3.) Please contact your KUBOTA dealer.
500 h
Replace the drive unit oil 500 h
Change hydraulic oil and
suction filter 2.)
Replace the in-line filter Please contact your KUBOTA dealer. 1000 h
Replace the air filter elements
).1
1000 h
Change running gear and
track roller oil
Check alternator and starter
motor
connections
Please contact your KUBOTA dealer. Annually
Safety inspection Annually
Replace the coolant and rinse
the cooling system
every 2
years
Replace coolant hoses and
clamps Please contact your KUBOTA dealer.
250 h
Change hydraulic hoses Please contact your KUBOTA dealer.
every 6
years

I-S-15
b. PP (KTC, KCL)-version
* 500 thru 1000 continued to the following table.
No. Check points Intervals
Hour meter indicator
Consequently
50 100 150 200 250 300 350 400 450
1 Coolant
check Daily check
change every 2 years
2 Fuel check Daily check
3 Engine oil
check Daily check
change every 500 hrs
4 Hydraulic oil
check Daily check
change every 1000 hrs *1
5 Lubrication points - Daily check
6 Radiator and oil cooler check Daily check
7 Engine and electrical wiring check Daily check every year
8 Fuel tank, Fuel filter drain every 50 hrs
9 Battery condition check every 50 hrs
10 Greasing swing bearing teeth - every 50 hrs
11 Fan belt tension adjust every 200 hrs
12 Radiator hoses and clamps
check every 200 hrs
replace every 2 years
13 Air filter element
Outer element
clean every 200 hrs *2
@replace every 1000 hrs *2
Inner element replace every 1000 hrs *2
14 Greasing swing ball bearings - every 200 hrs
15 Fuel filter element replace every 400 hrs @
16 Engine oil filter replace every 500 hrs
17 Drive unit oil change every 500 hrs
18 Hydraulic return filter element replace every 500 hrs
19 Hydraulic suction filter element replace every 1000 hrs
20 Fuel injection nozzle injection
pressure
check every 1500 hrs *4 @
21 Front idler and track roller oil change every 2000 hrs
22 Alternator and starter motor check every 2000 hrs
23 Injection pump check every 3000 hrs *4 @
24 Radiator system rinse every 2 years
25 Fuel line and Intake air line
check every 200 hrs
@
replace every 2 years *3

I-S-16
First operation
*1 When using a hydraulic breaker, change hydraulic oil and return filter according to the table on "Hydraulic Oil Change
(Including Exchange of the Suction Filter in the Hydraulic Tank) under "EVERY 1000 SERVICE HOURS" in the chapter
"REGULAR CHECKS AND MAINTENANCE WORK".
*2 Clean and replace the air filter more frequently if used under dusty conditions. By heavy soiling, replace the filter.
*3 Replace only if necessary.
*4 Consult your local KUBOTA Dealer for this service.
A The items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the U.S. EPA non-
road emission regulation. As the engine owner, you are responsible for the performance of the required maintenance
on the engine according to the above instruction. Please see the Warranty Statement in detail.
No. Check points Intervals
Consequently
500 550 600 650 700 750 800 1000
1 Coolant
check Daily check
change every 2 years
2 Fuel check Daily check
3 Engine oil
check Daily check
change every 500 hrs
4 Hydraulic oil
check Daily check
change every 1000 hrs *1
5 Lubrication points - Daily check
6 Radiator and oil cooler check Daily check
7 Engine and electrical wiring check Daily check every year
8 Fuel tank, Fuel filter drain every 50 hrs
9 Battery condition check every 50 hrs
10 Greasing swing bearing teeth - every 50 hrs
11 Fan belt tension adjust every 200 hrs
12 Radiator hoses and clamps
check every 200 hrs
replace every 2 years
13 Air filter element
Outer element
clean every 200 hrs *2
@replace every 1000 hrs *2
Inner element replace every 1000 hrs *2
14 Greasing swing ball bearings - every 200 hrs
15 Fuel filter element replace every 400 hrs @
16 Engine oil filter replace every 500 hrs
17 Drive unit oil change every 500 hrs
18 Hydraulic return filter element replace every 500 hrs
19 Hydraulic suction filter element replace every 1000 hrs
20 Fuel injection nozzle injection
pressure
check every 1500 hrs *4 @
21 Front idler and track roller oil change every 2000 hrs
22 Alternator and starter motor check every 2000 hrs
23 Injection pump check every 3000 hrs *4 @
24 Radiator system rinse every 2 years
25 Fuel line and Intake air line
check every 200 hrs
@
replace every 2 years *3

I-S-16-1
b-1. KTA-version
IMPORTANT:
• * Clean the air filter more frequently if used in dusty conditions. With heavy soiling, replace the filter.
** When using a hydraulic breaker, change hydraulic oil and return filter according to the table on
"Hydraulic Oil Change(Including Exchange of the Suction Filter in the Hydraulic Tank)" under
"EVERY 1000 SERVICE HOURS" in "REGULAR CHECKS AND MAINTENANCE WORK".
• The items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the
U.S.EPA nonroad emission regulation. As the engine owner, you are responsible for the performance of
the required maintenance on the engine according to the above instruction. Please see the Warranty
Statement in detail.
No. Checkpoints Intervals
1 Fuel check
2 Engine oil
check
change
3 Hydraulic oil**
check
change
4 Coolant
check
change
5 Lubrication points Daily check
6 Radiator check
check
7 Battery condition check
8 Electrical lines check
9
Greasing of swing
bearing teeth
10
Fan belt tension
Drive unit oil
adjust11
Radiator hoses
and clamps
check
change
change
12
Air filter element*
clean
change
13
Greasing of swing
ball bearings
14
Fuel pipes and
hoses
check
change
15
Engine oil filter change16
Fuel filter
check
change
17
Hydraulic return
filter element
change18
Hydraulic suction
filter element
change19
Front idler and
track roller oil
change20
Dynamo and
starter motor
check21
Radiator system rinse22
Fuel injection nozzle
(Injection pressure)
check23
24 Injection pump check
Consequently
50 100 150 200 250 300 350 400 450 500 550 600 1000 2000
Daily check
Daily check
every 250 hrs
Daily check
every 1000 hrs
Daily check
every 2 years
Daily check
every 50 hrs
Daily check, Annual servicing
every 50 hrs
every 200 hrs
every 500 hrs
every 200 hrs
every 2 years
every 200 hrs
every 1000 hrs
every 200 hrs
every 200 hrs
every 2 years
every 250 hrs
every 50 hrs
every 500 hrs
every 1000 hrs
every 1000 hrs
every 2000 hrs
every 2000 hrs
every 2 years
@
@
@
@
every 1500 hrs
every 3000 hrs

I-S-16-2
c. Hydraulic Oil Check for Machines with Hydraulic Breakers
The hydraulic oil change after 1000 operating hours in
the operator’s manual is based on the type of work
done. Following inspection measure are valid when
hydraulic breakers are used:
1. Changing and filling up of hydraulic oil
1) The hydraulic oil must be changed more often
when breakers are used because the machine is
subject to harder conditions than at normal
excavating work.
2) Use only the recommended oils mentioned in
the operator’s manual when changing or fill oil.
3) When filling up oil, never mix oils of different
makes.
2. Changing the return filter and oil
1) The filter must be changed more often because
of contamination resulting from the frequent
assembly and disassembly of the hoses.
2) Use the correct replacement filter.
3) Oil change according to operating hours.
3. Kubota’s recommended breakers for U17-3α and
U17/U17-3.
(Japanese breakers)
Hydraulic oil Return Filter Suction Filter
Normal excavator work every 1000 hrs. 500 hrs.
1000 hrs.Breaker
work
portion
20% every 800 hrs.
300 hrs.
40% every 400 hrs.
60% every 300 hrs.
100 hrs.More
than
80%
every 200 hrs.
Furukawa HB2G
Tokuu TNB-1E
Maruzen MHB-71
Nippon Pneumatic H-08X

I-S-17
d. Maintenance items
(1)Drive unit Oil Change(First Oil Change of the 100 hours)
CAUTION
To avoid personal injury:
• Lower attachments on theground, stop the engine andremove the key beforeundertaking the oil
change.
1) Rotate the crawler so that the drain plugof the
drive unit is in the bottom position.
2) Remove the drain plug to let the oil runout. Screw
in and tighten the drain plugagain and fill with gear
oil through the oilcheck port.
3) Fill oil until it overflows out of the oilcheck port.
Oil change
• first oil change after 100 hrs
• then every 500 hrs
• or at least once a year
4) Use prescribed gear oil SAE 90.
(2)Inspection and Cleaning of the Air Filter Element
Open the engine bonnet and remove thedust-cover. Take out only outer element,clean the element, case
interior and reassemble. During reassembly, take care to install the dust-cover so that its TOP mark (arrow)
faces up-wards. Do not remove the inner element.
IMPORTANT :
• Should the machine be used in extremely dusty areas, the air filter element must be inspected and
cleaned more frequently than in the specified maintenance periods.
• The air filter has a dry element, keep free from oil.
• Do not run the engine without the air filter.
Gear oil volumes approx. 0.25 L (0.07 USgal.)
(1) Oil check port (also serves as oil filling port)
(2) Drain plug
(1) Outer element
(2) Inner element
(3) Dust-cover
(4) Clamps

I-S-18
CAUTION
To avoid personal injury:
• Wear eye protection.
Cleaning with compressed air
Pressure of compressed air must be under 205 kPa
(2.1 kgf/cm2
, 30 psi) and the cartridge should be
blown clean from the inside to the outside until the
dust deposits are remarkably reduced.
IMPORTANT:
• If the air suction is still inadequate, or the colour of
the exhaust gases is abnormal even after the
cleaning, the air filter element must be replaced.
(3)Cleaning the Track Frame Slide Pipes
When the slide pipes of the track frame are clogged or adhered with soil or sand, clean the slide pipes in the
following manner according to need.
WARNING
To avoid the personal injury or death:
• Place the machine on even ground when cleaning the track frame slide pipes.
1. First lift the machine off the ground using the
dozer blade and boom functions.
2. Switch the track width change / dozer select lever
to the “Track width change” position.
3. Push the control lever forward, and expand the
track width to 1240 mm (48.8 in.).
4. Remove soil and sand adhered to the slide pipes,
then put grease evenly around the pipes. Make
sure all 4 slide pipes are greased.
5. Retract and expand the track width repeatedly for
a few times by moving the control lever, so that
the grease is spread adequately.
6. Switch the track width change / dozer select lever
to the “Dozer” position.
7. Place the machine down on the ground carefully
by moving the dozer blade and the boom.
(1) Track frame slide pipes

I-S-19
e. Troubleshooting for operators
If the excavator does not show the desired performance, or when trouble arises, refer to the table below and
undertake appropriate measures.
Trouble Cause Countermeasure
Engine
Starting difficulties
Fuel is too viscous
* Check fuel tank and filter
* Remove impurities and water
* If necessary, replace filter
Air or water in the fuel system
* Remove water from the fuel tank
* Check fuel pipe joint bolts and nuts for looseness
* Purging of the fuel system (for fuel filter and injection pump,
see "PURGING OF THE FUEL SYSTEM" in "OTHER
ADJUSTMENTS AND REPLACEMENTS".)
Oil viscosity is too high that the
engine runs sluggishly in winter
* Pour hot water over the radiator
* Use oils of different viscosities depending on the ambient
temprature. (Use SAE10W, SAE10W-30 or SAE10W-40)
Battery is almost dead; insufficient
compression
* Recharge battery
Insufficient engine
power
Low fuel level * Check fuel and add if necessary
Clogged air cleaner * Clean the air filter element
Engine suddenly
stops
Low fuel level
* Check fuel and add if necessary
* Purge the fuel system
Abnormal exhaust
gascolour
Poor fuel * Use high quality fuel
Too much engine oil * Drain engine oil to prescribed oil level
Water temperature
too high (Overheat-
ing)
Defective seal of the water pump * Replace
Worn or torn fan belt * Adjust or replace
Thermostat is defect * Replace
Coolant level too low * Fill to prescribed level
Radiator grill or fins are clogged * Clean
Coolant is contaminated with rust
from the cylinder head or crank case
* Replace coolant fluid and add anti-rust
Defective radiator cap (Evaporation) * Replace
Corroded coolant pipes * Clean
Continuous operation under full load * Reduce load
Cylinder head gasket is damaged
(Coolant loss)
* Replace
Engine oil level too low * Fill to prescribed level
Maladjustment of fuel injection * Readjust ignition timing
Use of poor fuel * Use prescribed fuel
HydraulicSystem
Boom, arm, bucket,
drive, swing and
dozer power is too
low
Hydraulic oil level too low * Add oil
Leakages of hoses and / or joints * Replace hose or joint
Non-function of
swing motor
Swing lock pin is in lock position * Remove swing lock pin in unlock position
DriveSystem
Deviation of drive
direction
Blocked through stones * Remove
Crawler too loose or too tight * Adjust accordingly

I-S-20
f. Periodic replacement of important component parts
To ensure safety in operation, you are strongly requested to inspect and service the machine at regular inter-
vals. For added safety, ask your KUBOTA dealer to replace the following important component parts.
These parts are prone to degradation in material or subject to wear and tear with time. It is difficult to judge
how much they have been affected at regular inspection. It is therefore necessary to replace them with new
ones, whether wear is visible or not after a specified time of use.
If any of them is found worn even before the specified use, it must be repaired or replaced the same way as
other parts.
If any of the hose clamps is found deformed or cracked, the hose clamp must also be replaced.
For the hydraulic hoses other than the ones to be replaced periodically, inspect them for the following points.
If found unusual, tighten them up, replace them.
When replacing the hydraulic hoses, change their O rings and sealings with new ones.
For replacement of the important parts, contact your KUBOTA dealer.
• At the following periodic inspections, check the fuel hoses and hydraulic hoses as well.
List of important component parts
To prevent serious damage to the hydraulic system, use only a KUBOTA genuine hydraulic
hose.
Inspection Interval Check points
Daily Checks Oil leak at fuel and hydraulic hose connections and points
Every month Oil leak at fuel and hydraulic hose connections and points Damages at fuel and hydraulic hose
(cracks, chafing)
Every year Oil leak at fuel and hydraulic hose connections and points Interference, deformation, degrada-
tion, twist and other damages (cracks, chafing) of fuel and hydraulic hoses
No. Component parts Q'ty Period
1 Fuel hose (Fuel tank-Fuel filter) 2
Every 2 years or 4000 hours
2 Fuel hose (Fuel filter-Fuel pump) 2
3 Fuel hose (Fuel pump-Fuel nozzle) 2
4 Fuel hose (Fuel nozzle-Fuel tank) 1
5 Fuel hose (Fuel tank-Fuel drain) 1
6 Hydraulic hose (Main pump suction) 1
7 Hydraulic hose (Main pump delivery) 4
8 Hydraulic hose (Boom cylinder) 2
9 Hydraulic hose (Arm cylinder) 2
10 Hydraulic hose (Bucket cylinder) 2
11 Hydraulic hose (Swing cylinder) 2
12 Hydraulic hose (Dozer cylinder) 2
13 Hydraulic hose (Service port) 4

I-S-21
g. Recommend oils
IMPORTANT
1. Before delivery, the hydraulic oil used was an ISO 46 viscosity grade.
2. Use engine oil API service classification CD, CE or CF.
3. Use SAE 90 (API, CLA/GL5) as drive unit oil for all seasons.
Application Viscosity Shell Mobil Exxon MIL-Standard
Engineoil
In winter or by
low tempera-
tures
SAE
10W
Shell Rotella T10W
Shell Rimula 10W
Mobil Delvac 1310
XD-3 10W
XD-3 Extra 10W
MIL-L-2104C
MIL-L-2104D
SAE
20W
Shell Rotella T20W-2
Shell Rimula 20W-20
Mobil Delvac 1320
XD-3 20W-20
XD-3 Extra 20W-20
In summer or by
high ambient
temperatures
SAE
30
Shell Rotella T30
Shell Rimula 30
Mobil Delvac 1330
XD-3 30
XD-3 Extra 30
SAE
40
Shell Rotella T40
Shell Rimula 40
Mobil Delvac 1340
XD-3 40
XD-3 Extra 40
SAE
50
Shell Rimula 50 Mobil Delvac 1350
All-Season
engine oil
Multi-pur-
pose
Shell Rotella T15W
XD-3 15W-40
XD-3 Extra 15W-40
Gearoil
In winter or by
low tempera-
tures
SAE
75
Mobilube HD80W-90
MIL-L-2105C
Shell Oil S8643
SAE
80
Mobilube HD80W-90
Shell Spirax HD80W
In summer or by
high ambient
temperatures
SAE
90
Mobilube 46 MIL-L-2105
Shell Spirax HD90 Mobilube HD80W-90 MIL-L-2105C
SAE
140
MobilubeHD85W-140 MIL-L-2105C
Shell Spirax HD140 MobilubeHD80W-140 MIL-L-2105C
All-weather
gear oil
Multi-pur-
pose
Shell Spirax HD80W
Shell Spirax HD85W
Mobilube HD80W-90 GX80W-90 MIL-L-2105C
Hydraulicoil
In winter or by
low tempera-
tures
ISO
32
Shell Tellus T32 Mobil DTE-Oil 13 NUTO H32
ISO
46
In summer or by
high ambient
temperatures
ISO
68
Grease Shell Alvania EP2 Mobilux EP2 BEACON Q2
Fuel Light oil No. 2-D (ASTM D975)
Fuel under -5 °C Light oil No. 1-D (ASTM D975)

I-S-22
h. Lifting capacity : U15-3
3500
3000
2.9
(0.30)
3.1
(0.32)
2.9
(0.30)
4.0
(0.41)
5.2
(0.53)
2.8
(0.29)
2.1
(0.22)
3.8
(0.39)
2.7
(0.28)
2.1
(0.21)
3.6
(0.37)
2.6
(0.27)
2.0
(0.21)
3.5
(0.36)
2.6
(0.26)
2.0
(0.20)
3.5
(0.36)
2.5
(0.26)
2.0
(0.20)
7.3
(0.75)
5.5
(0.56)
3.5
(0.36)
2.5
(0.26)
11.0
(1.12)
5.6
(0.57)
3.6
(0.37)
5.3
(0.54)
2500
2000
1500
1000
500
0
–500
–1000
–1500
–2000
0 500 1000 1500 2000 2500 3000 3500
LOAD RADIUS (mm)HEIGHT
(mm)
(i) OVER – END (BLADE UP)
kN (ton)
GL
3500
3000
2.7
(0.28)
3.1
(0.32)
2.7
(0.28)
3.7
(0.38)
5.2
(0.53)
2.7
(0.27)
2.0
(0.20)
3.5
(0.36)
2.6
(0.26)
2.0
(0.20)
3.3
(0.34)
2.5
(0.25)
1.9
(0.19)
3.3
(0.33)
2.4
(0.24)
1.9
(0.19)
3.2
(0.33)
2.4
(0.24)
1.8
(0.19)
7.3
(0.75)
5.0
(0.51)
3.2
(0.33)
2.4
(0.24)
10.9
(1.11)
5.1
(0.52)
3.3
(0.34)
5.2
(0.53)
2500
2000
1500
1000
500
0
–500
–1000
–1500
–2000
0 500 1000 1500 2000 2500 3000 3500
(mm)
(iii) OVER – SIDE (TRACK WIDTH 1240mm)
kN (ton)
GL
3500
3000
3.7
(0.37)
3.1
(0.32)
3.6
(0.36)
4.5
(0.46)
5.2
(0.53)
4.0
(0.41)
3.6
(0.37)
6.2
(0.63)
4.6
(0.47)
3.8
(0.38)
6.9
(0.70)
4.9
(0.50)
3.8
(0.39)
6.6
(0.67)
4.8
(0.49)
3.6
(0.37)
5.8
(0.60)
4.3
(0.44)
3.2
(0.33)
7.3
(0.75)
8.1
(0.83)
4.9
(0.50)
3.6
(0.37)
11.0
(1.12)
7.0
(0.71)
3.7
(0.37)
5.3
(0.54)
2500
2000
1500
1000
500
0
–500
–1000
–1500
–2000
0 500 1000 1500 2000 2500 3000 3500
(mm)
(ii) OVER – END (BLADE DOWN)
kN (ton)
GL

I-S-23
F.Specifications
a. Machine Weight
Iron crawler isn’t available for these models.
(1)KE, KDG, KUK version
(2)PP (KTC, KCL, KTA) version
Long arm is installed in standard version.
b. Main Specifications
unit U15-3
Canopy Long arm kg 1490
Cabin Long arm kg 1580
4 post Rops Rubber crawler
kg
lbs
1600
3527
model U15-3 (EU, new) U-15 (EU, old)
Engine
Brand KUBOTA KUBOTA
Type D782-EBH-4 D782-BH
Output
PS/rpm 13/2300 12/2100
kW/rpm 9.6/2300 8.8/2100
Displacement cm3 (in3) 778 (47.5) 778 (47.5)
Machine weight kg (lbs) 1600 (3527.4) 1450 (3196.7)
Excavating capacity
Bucket kN (kgf) lbf 15.2 (1550) 3147 12.5 (-) 2810
Arm kN (kgf) lbf 8.8 (900) 1978 8.5 (-) 1910
Hydraulic pump
P1, P2
Relief pressure MPa (kg/cm2
) psi 21.6 (220) 3129 20.6 (210) 2988
Pump discharge rate L/min (US GPM) 16.6 (4.39) 15.1 (3.99)
P3
Relief pressure MPa (kg/cm2
) psi 18.6 (190) 2702 210 (2988)
Pump discharge rate L/min (US GPM) 10.4 (2.75) 9.5 (2.51)

I-S-24
c. Lever stroke and operating force
Reference on new vehicle
Unit U15, U15-3 Remarks
Boom lever
Stroke mm (in) 72 (2.83) Measured at the grip end
Operating force N (kgf) lbf 13.7 (1.4) 3.1 Measured 20 mm below the grip end
Play mm (in) 2 (0.079 )
Arm lever
Play mm (in) 2 (0.079 )
Bucket lever
Play mm (in) 2 (0.079 )
Swivel lever
Play mm (in) 2 (0.079 )
Travel lever
Clearance LH/RH lever
at neutral position.
mm (in) 5 (0.197) Longitudinal direction
Clearance LH/RH lever
at most forward and
backward position.
mm (in) 10 (0.394) Longitudinal direction
Clearance LH/RH lever mm (in) 2 ~ 5 (0.079 ~ 0.197) Lateral direction
Acceleration lever Operating force N (kgf) lbf 33.3 (3.4) 7.5 Measured 30 mm below the grip top
Dozer lever
Lock lever, up Operating force 19.6 (2.0) 4.4
Lock lever, down Operating force 29.4 (3.0) 6.6
Swing pedal Operating force N (kgf) lbf 98.0 (10.0) 22.0 Measured at the grip end
Travel high SW Operating force N (kgf) lbf - Electric switch
>= >=
>= >=
>= >=
>= >=

I-S-25
d. Dimensions of Parts
(1)Front pins and bush
[Unit : mm (in)]
* The working limits of the pins are 1.0 shorter than the reference on new vehicle.
Location No. Pin diameter x length Bush inner dia. x outer dia. x length Remarks
(1) φ35 x 257 (φ1.38 x 10.12) φ35 x φ45 x 45 (φ1.38 x φ1.77 x1.77)
(2) φ35 x 160 (φ1.38 x 6.30) φ35 x φ45 x 35, 44 (φ1.38 x φ1.77 x1.38, 1.73)
(3) φ35 x 160 (φ1.38 x 6.30) φ35 x φ45 x 45 (φ1.38 x φ1.77 x1.77)
(4) φ30 x 112.5 (φ1.38 x 4.43) φ30 x φ40 x 35 (φ1.18 x φ1.57 x1.38)
(5) φ30 x 96 (φ1.38 x 3.78) φ30 x φ40 x 35 (φ1.18 x φ1.57 x1.38)
(6) φ50 x 109 (φ1.38 x 4.29) φ50 x φ60 x 37, 28, 40 (φ1.97 x φ2.36 x1.46, 1.10, 1.57)
(7) φ50 x 109 (φ1.38 x 4.29) φ50 x φ60 x 37, 28, 40 (φ1.97 x φ2.36 x1.46, 1.10, 1.57)
(8) φ30 x 160 (φ1.38 x 6.30) φ30 x φ40 x 35 (φ1.18 x φ1.57 x1.38)
(9) φ30 x 142 (φ1.38 x 5.59) φ30 x φ40 x 35 (φ1.18 x φ1.57 x1.38)
(10) φ30 x 191 (φ1.38 x 7.52) φ30 x φ38 x 35 (φ1.18 x φ1.50 x1.38)
(11) φ30 x 142 (φ1.38 x 5.59) φ30 x φ40 x 45 (φ1.18 x φ1.57 x1.77)
(12) φ30 x 192.5 (φ1.38 x 7.58) φ30 x φ40 x 35 (φ1.18 x φ1.57 x1.38)
(13) φ30 x 192.5 (φ1.38 x 7.58) φ30 x φ38 x 35 (φ1.18 x φ1.50 x1.38)
(14) φ30 x 182 (φ1.38 x 7.17) φ30 x φ38 x 35 (φ1.18 x φ1.50 x1.38)
(15) φ30 x 182 (φ1.38 x 7.17) φ30 x φ38 x 35 (φ1.18 x φ1.50 x1.38)
Length
Outside
diameter
Length
Outside
diameter
pin : φ25 , φ30 , φ35 , φ50
bush : Inner dia. φ25 , φ30 , φ35 , φ50
Outer dia. φ38 , φ40 , φ45 , φ60
-0.05
-0.08
-0.05
-0.07
-0.05
-0.07
-0.05
-0.07
+0.130
+0.100
+0.130
+0.100
+0.130
+0.100
+0.090
+0.060
+0.070
+0.040
+0.100
+0.070
+0.100
+0.070
+0.100
+0.070
(New pin and bush tolerance)
[Unit : mm]
pin : φ0.98 , φ1.18 , φ1.38 , φ1.97
bush : Inner dia. φ0.98 , φ1.18 , φ1.38 , φ1.97
Outer dia. φ1.50 , φ1.57 , φ1.77 , φ2.36
-0.002
-0.003
-0.002
-0.003
-0.002
-0.003
-0.002
-0.003
+0.005
+0.004
+0.005
+0.004
+0.005
+0.004
+0.004
+0.002
+0.003
+0.002
+0.003
+0.002
+0.003
+0.002
+0.003
+0.002
[Unit : in]

I-S-26
(2)Bucket fixture dimensions
Unit U15-3, U15 Remarks
A mm (in) 45.3 (1.78)
B mm (in) 2 x M12 x 1.25
C mm (in) 45.3 (1.78)
D mm (in) 45.3 (1.78)
E mm (in) 16.5 (0.65)
F mm (in) 3.95 (0.16)
G mm (in) 865 (34.06)
H mm (in) 2 (0.08)
I mm (in) 180 (7.09)
J mm (in) 167.5 (6.59)
K mm (in) 104.5 (4.11)
L mm (in) 735 (28.94)
M mm (in) 173 (6.81)
N mm (in) 175 (6.89)
O mm (in) 85 (3.35)

I-S-27
(3)Bucket link pin
[Unit : mm (in)]
Parts name Specifications
(1) Bucket link 1 φ30 x 95.5 (φ1.18 x 3.76)
(2) Bush A φ30 x φ38 x W35 (φ1.18 x φ1.50 x W1.38)
(3) Pin A dia φ30 x 192.5 (φ1.18 x 7.58)
(5) Bucket link 2, 3 φ30 - φ30 (φ1.18 - φ1.18)
(6) Arm boss φ55 x φ38 x L125.5 (φ2.17 x φ1.50 x L4.94)
(7) Bush B φ30 x φ38 x W35 (φ1.18 x φ1.50 x W1.38)
(8) Pin B dia φ30 x 192.5 (φ1.18 x 7.58)
(10) Bucket cylinder L/S (stroke) 529 / 802 (269) (20.83 / 31.57 (10.59))

I-S-28
(4)Track roller
(A) Reference on new vehicle
(B) Allowable limit
Lower roller
(a) Guide width
(A)/(B) mm φ80/76 (3.15/2.99)
(b) Outside diameter (A)/(B) mm φ110 (4.33)
(c) Roller width (A)/(B) mm 102 (4.02)
(d) Roller width (A)/(B) mm 23/20 (0.91/0.79)
(e) Slide plate (A)/(B) mm 9/4 (0.35/0.16)
(a) (b)
(c)
(d)
(e)
Slide plate

I-S-29
(5)Idler and sprocket
(A) Reference on new vehicle
(B) Allowable limit
Idler
(a) Outside diameter
(A)/(B) mm (in)
202/196 (7.95/7.72) Rubber Crawler
196/190 (7.72/7.48) Steel Crawler
(b) Guide width (A)/(B) mm (in) 27/23 (1.06/0.91)
(c) Idler width (A)/(B) mm (in) 60/55 (2.36/2.17)
Sprocket
(d) Outside diameter
(A)/(B) mm (in) 290/284 (11.42/11.18)
Sprocket
(e) Wheel width
(A)/(B) mm (in) 23/18 (0.91/0.71)
(a)
(b)
(c)
(d)
(e)

I-S-30
(6)Dozer
(1) Pin outside dia. - Length mm (in) φ30-102.5 (φ1.18-4.04)
(2) Outside diameter - Length mm (in) φ30-84.5 (φ1.18-3.33)
(3) Outside diameter - Length mm (in) φ30-84.5 (φ1.18-3.33)
(4) Outside diameter - Length mm (in) φ30-95 (φ1.18-3.74) Track cylinder mounting pin
(5) Outside diameter - Length mm (in) φ25-133 (φ0.98-5.24) Extension blade mounting pin
A Width mm (in) 1244/990 (48.98/38.98)
B Height mm (in) 261 (10.28)
C Length mm (in) 710 (27.95)
D Tip wear thickness mm (in) t 9 (t0.35)
E Distance between supports mm (in) 434 (17.09)
Movement above ground/below ground mm (in) 263/182 (10.35/7.17)
Dozer capacity m3
(ft3
) 0.067 (2.25) w/o Extention blade

I-S-31
(7)Bucket dimensions
(1) mm (in) 400 (15.75) Lip outside width
(2) mm (in) 456 (17.95) Side cutter outside width
(3) mm (in) 60.5 x 6 (2.38) φ x t
(4) mm (in) 139.5 (5.49)
(5) mm (in) 95.5 (3.76) Arm end width
(6) mm (in) 16 (0.63)
(7) mm (in) 22 (0.87)
(8) mm (in) 47.75 (1.88)
(9) mm (in) φ49 (1.93)
(10) mm (in) φ60 (2.63)
(11) mm (in) φ30 (1.18)
(12) mm (in) φ30 (1.18)
(13) mm (in) 457 (17.99)
(14) mm (in) 380.5 (14.98)
(15) mm (in) φ48.5 (1.91)
(16) mm (in) 126.5 (4.98)
(17) mm (in) 88.5 (3.48)
(18) mm (in) 16.5 (0.65)

I-S-32
(8)Machine weight and parts weight
* The weights in the table below are approximate.
Machine weight kg (lbs) 1600 (3527)
Body weight kg (lbs) 1340 (3527)
Maximum breaker weight kg (lbs) 90 (198)
Backhoe overall kg (lbs) 177 (390)
Swing bracket and boom cylinder
not included
Upper swivel structure kg (lbs) 816 (1799) Canopy/cabin
Lower travel structure kg (lbs) 577 (1272) Rubber crawler
Track frame kg (lbs) 61/83/61 (135/183/135) Left/center/right
Swivel frame kg (lbs) 150 (331)
Swing bracket kg (lbs) 28 (62)
Boom kg (lbs) 67 (148)
Arm kg (lbs) 30 (66)
Bucket kg (lbs) 29 (64) 450-400
Dozer kg (lbs) 67 (148)
Counterweight kg (lbs) 205 (452)
Iron crawler kg (lbs) 89 (196)
Rubber crawler kg (lbs) 56 (124)
Engine kg (lbs) 64 (141) Dry weight
Hydraulic tank kg (lbs) 13 (29) With filter
Fuel tank kg (lbs) 1.6 (3.5)
Swivel bearing kg (lbs) 17 (38)
Battery kg (lbs) 13 (29)
Track roller kg (lbs) 4 (8.8)
Upper track roller kg (lbs) -
Sprocket kg (lbs) 5 (11.0)
Idler kg (lbs) 18 (40) Sprocket included
Canopy roof kg (lbs) 9 (20)
Post (support) kg (lbs) 21 (46)
Pump assembly kg (lbs) 14 (31)
Wheel motor kg (lbs) 17 (38)
Swivel motor kg (lbs) 15,(33)
Control valve kg (lbs) 14 (31) Without joint
Boom cylinder kg (lbs) 15 (33)
Arm cylinder kg (lbs) 12 (27)
Bucket cylinder kg (lbs) 11 (24)
Swing cylinder kg (lbs) 9 (20) Offset
Dozer cylinder kg (lbs) 7 (15)
Rotary joint kg (lbs) 13 (29)
Radiator kg (lbs) 2 (4.4)

I-S-33
(9)Water and Oil Quantity
Radiator soft water L (US gal) 2.7 (0.713) Kubota LLC-N-50F
Reserve tank soft water L (US gal) 0.6 (0.159)
Crankcase engine oil
(at filter replacement)
L (US gal) 3.5 (0.295)
Class CC
10W30
Hydraulic tank oil L (US gal) 13 (3.434) ISO VG 46
Total hydraulic oil L (US gal) 22 (5.812) ISO VG 46
Wheel motor gear oil L (US gal) 0.25 (0.066) SAE 90 (API, GL-4)
Swivel reducer gear oil L (US gal) -
Track roller gear oil cc (cu-in) 40 (2.44) Engine Oil SAE 30 Class CD
Carrier roller
(upper track roller)
cc (cu-in) - (-) Grease EP2
Front idler cc (cu-in) 30 (1.83) Engine Oil SAE 30 Class CD
Fuel tank light oil (full) L (US gal) 18 (4.755) Diesel light oil No. 3

I-S-34
e. Quality specifications
(Installation : Rubber track, standard arm and bucket.)
No Specificatios Items Unit U15-3 EU / U15(KTC) Remarks
Q1 Main Speed JIS A8404
1 1 Machine size Total length(Transport) mm 2600 ± 52
inch 102.4 ± 2.05
2 Total width mm 1240/990 ± 12
inch 48.8/39.0 ± 0.5
3 Total height(Canopy) mm 2300 ± 23
inch 90.6 ± 0.9
4 Total height(Cabin) mm -
inch -
2 1 Weight Machine weight(Canopy) kg 1600 ± 32 Fuel tank full
lbs 3527.4 ± 70.5
2 Machine weight(Cabin) kg -
lbs -
3 Ground contact press.
(Canopy)
kPa 27.73
psi 4.02
kgf/cm2 0.28
4 Ground contact press.
(Cabin)
kPa -
psi -
kgf/cm2 -
3 1 Performance Swivel speed rpm 8.7 ± 0.9 Rated engine RPM, η=100%
2 Travel speed F1 km/h 2.2 ± 0.2
mph 1.37 ± 0.12
3 F2 km/h 4.0 ± 0.4
mph 2.49 ± 0.25
4 R1 km/h 2.2 ± 0.2
mph 1.37 ± 0.12
5 R2 km/h 4.0 ± 0.4
mph 2.49 ± 0.25
6 Gradeability deg. 30 <
4 1 Rear end min. turning radius mm 620 ± 12
inch 24.4 ± 0.5
2 Swivel frame rear ground clearance mm 422 ± 8
inch 16.6 ± 0.3
3 Tambler center distance mm 1230 ± 37
inch 48.4 ± 1.5
4 Crawler total length mm 1587 ± 48
inch 62.5 ± 1.9
5 Crawler total width mm 1240/990 ± 26
inch 48.8/39.0 ± 1.0
6 Crawler shoe width mm 230 ± 5
inch 9.1 ± 0.2
7 Min. ground clearance mm 145 ± 4
inch 5.7 ± 0.2

I-S-35
5 1 Engine Model name EU : D782-BH-4
PP : D782-E2-BH-4
2 Rated output kW 9.6 ± 0.2
ps 13.0 ± 0.3
3 Rated speed rpm 2300
4 Displacement L 0.778
cc 778
US gal 0.21
6 1 Hydraulic pump type Variable x2 + gear
2 Pump delivery P1,P2 L 16.6
US gal 4.38
P3 L 10.4
US gal 2.75
P4 L 6.2
US gal 1.64
4 Main relief pres-
sure (Bench set)
P1,P2 MPa 21.6 +1.0
-0.5
kgf/cm2 220 +10
-5
bar 216 +9.8
-4.9
psi 3128 +142
-71
P3 MPa 18.6 +1.0
-0.5
kgf/cm2 190 +10
-5
bar 186 +9.8
-4.9
psi 2702 +142
-71
5 Main relief pres-
sure (Bench set)
P4 MPa 3.9 +0.3
-0.2
kgf/cm2 40 +3
-2
bar 39 +3
-2
psi 569 +43
-28
7 1 Swivel motor type
8 1 Under carriage Travel motor type Variable displacement
pump
2 Parking brake type -
3 Crawler shoe type Rubber
9 1 Front attachment Bucket
heaped
capacity
CECE m3 0.04 ± 0.002
yd3 0.05 ± 0.003
2 SAE, JIS m3 0.04 ± 0.002
yd3 0.05 ± 0.003
3 Bucket width mm 456 ± 10 Without side cutter
inch 18.0 ± 0.4
4 Swing angle L deg. 63 ± 2
5 R deg. 58 ± 2
6 Max. digging radius mm 3901 ± 59
inch 153.6 ± 2.3
7 Ground level Max. digging
radius
mm 3843 ± 58
inch 151.3 ± 2.3
8 Ground level Min. finish
radius
mm 1320 ± 26 Bucket bottom horizontal
inch 52.0 ± 1.0
9 Max. digging depth mm 2306 ± 46
inch 90.8 ± 1.8

I-S-36
9 10 Front attachment Max. vertical digging depth mm 1911 ± 38
inch 75.2 ± 1.5
11 Max. digging height mm 3536 ± 71
inch 139.2 ± 2.8
12 Max. dump height mm 2443 ± 49
inch 96.2 ± 1.9
13 Max. dump height
(Arm vertical)
mm -
inch -
14 Mini. turning radius mm 1426 ± 43
inch 56.1 ± 1.7
15 Mini. turning radius
(Left swing)
mm 1207 ± 36
inch 47.5 ± 1.4
16 Off-set
amount
L mm 510 ± 15
inch 20.1 ± 0.6
17 R mm 385 ± 12
inch 15.2 ± 0.5
18 Max. digging force kgf 1.55
N 15.2
lbw 3.42
19 Optional
bucket range
JIS, SAE m3
yd3
10 1 Blade Width mm 1244/990 ± 5
inch 49.0/39.0 ± 0.2
2 Height mm 261 ± 5
inch 10.3 ± 0.2
3 Length mm -
inch -
4 Max. lift above GL mm 263 ± 13
inch 10.4 ± 0.5
5 Max. below GL mm 182 ± 9
inch 7.2 ± 0.4
6 Displacement capacity m3
yd3
11 1 Water & oil Radiator capacity L 2.7
US gal 0.71
2 Reserve tank capacity L 0.6
US gal 0.16
3 Engine crank case L 3.5
US gal 0.30
4 Hydraulicoil
(all amount)
Full L 22
US gal 5.81
5 Hydraulicoil
(tank amount)
Tank L 13
US gal 3.43
6 Wheel motor L 0.25
US gal 0.07
7 Swivel reduction case L -
US gal -
8 Track roller L 0.04
US gal 0.01
9 Front idler L 0.03
US gal 0.01

I-S-37
11 10 Water & oil Fuel tank L 17.5 ± 0.9
US gal 4.62 ± 0.24
Q2 Main Specs JIS A8404
1 1 Bucket tooth slaggish mm 73 ± 93
inch 2.87 ± 3.66
2 Decline of front attachment mm 0 ± 10
inch 0.00 ± 0.39
3 Blade's declination mm 0 ± 10
inch 0.00 ± 0.39
2 1 Eccentric amount from swing center mm - From swivel center
inch -
2 Distance to swing center mm -
inch -
3 1 Distance to boom pin mm -
inch -
2 Boom pin height mm - exclude grouser
inch -
3 Min. clearance of bucket teeth to boom cylinder
protector
mm 37 +34
-16
inch 1.46 +1.34
-0.63
4 Clearance of boom cylinder to shoe mm -
inch -
4 1 Approach angle deg. 30.1 ± 3.0
2 Distance to blade tip mm - From swivel center
inch -
3 Distance of crawler end to blade mm -
inch -
4 Clearance of blade to weight mm -
inch -
5 1 Crawler height mm 360 ± 7 Include grouser on the spocket
inch 14.17 ± 0.28
2 Max. crawler height mm 360 ± 7
inch 14.17 ± 0.28
3 Clearance of swivel frame to crawler mm
inch
4 Distance to idler center mm From swivel center
inch
5 Distance to sprocket center mm
inch
6 Protrusion amount of upper
frame to crawler outer end
L / R mm
inch
6 1 Swivel frame height mm
inch
2 Height to step mm Include rubber mat
inch
3 Height to seat mm
inch
4 SIP (ISO) mm
inch

I-S-38
Q3 Engine performance
1 1 Max. engine torque kgf·m 4.52 / 1750rpm
N·m 44.3 / 1750rpm
ft·lbs 32.7 / 1750rpm
2 Torque rise %
2 1 Max, engine rpm no load rpm 2600 >
2 1 pump relief rpm
3 2 pump relief rpm 2300 < arm + buckt
4 3 pump relief sec. 2300 < arm + buckt + dozer
3 1 Idling rpm rpm 1200 +150
0
4 1 Engine start time (Normal temp and grow) sec. Glow 5 sec
5 1 Cold start Cell start time sec. Temp. -17°C
2 Number of start
6 1 Charge starting engine rpm
2 Charging voltage
& ampare
alternation Battery spec 12V 40A
Q4 Travelling performance
1 1 Travel motor block performance, L/R mm 300 > 20 deg, 10 min
inch 11.81 >
2 1 Max, Traction
force
F1 kgf 1255 ± 126 η=65%
kN 12.31 ± 1.24
lbs 2767 ± 278
2 F2 kgf 637 ± 64
kN 6.25 ± 0.63
lbs 1404 ± 141
3 1 Travel straight-
ness
F1 mm 600 > 10m distance
inch 23.62 >
2 R1 mm 600 >
inch 23.62 >
3 Blade F1 mm 600 > Blade up & down 10m distance
inch 23.62 >
4 Blade R1 mm 600 >
inch 23.62 >
4 1 Track shoe sag
distance
Steel mm 25 to 30
inch 0.98 to 1.18
2 Rubber mm 10 to 15
inch 0.39 to 0.59
Q5 Work performance
1 1 Work amount 45 deg digging & side dump m3
/h
yd3
/h
2 Digging, 180 deg loading m3
/h
yd3
/h
2 1 Cycle time 45 deg digging & side dump sec.
2 Digging, 180 deg loading sec.
3 1 Fuel consumption Calculated L/h Load coefficiency=60%
US gal/h
2 Actual L/h
US gal/h

I-S-39
4 1 Boom lifting capacity kgf - Front end, Arm extend bucket
crowd, at toothkN -
lbw -
2 Arm digging force kgf 836, 824 < Bucket tooth root
kN 8.5, 8.08 <
lbw 1903, 1817 <
3 Bucket digging force kgf 1491, 1412 < Machine stance to JIS bucket tooth
rootkN 14.6, 13.85 <
lbw 3287, 3113 <
4 Blade force up kgf Cutting edge down force at ground
levelkN
lbw
down kgf
kN
lbw
5 1 Boom speed up sec. 2.2 ± 0.3 Oil temp. 50 ± 5°C
Max. height to ground2 down sec. 2.5 ± 0.3
6 1 Arm speed crowd sec. 3.5 ± 0.3
2 extend sec. 2.4 ± 0.3
7 1 Bucket speed crowd sec. 2.8 ± 0.3
2 dump sec. 1.9 ± 0.3
8 1 Blade speed up sec. 1.4 ± 0.3 Max. down to max. up
2 down sec. 1.9 ± 0.3 Max. up to max. down
9 1 Swivel angle while boom raise deg. GL-Max. height, before cushioning
2 Inching performance mm - CV spool stroke
inch -
10 1 Arm cylinder cavitation - Oil temp. 50 ± 5°C
2 Arm cylinder shrink mm 5 > Oil temp. 95 ± 5°C ,1300 rpm,
bucket heaped, loadinch 0.2 >
11 1 Blade cylinder cavitation
12 1 Bucket outer width without side
cutter
mm
inch
2 with side cutter mm
inch
13 1 Max. digging height radius mm 2015 ± 202
inch 79.33 ± 7.95
2 Max. dump height radius mm 2012 ± 121 at bucket pin
inch 79.21 ± 4.76
3 Distance max. digging depth mm From swivel center
inch
4 Bucket bottom height at arm vertical mm 1200 ± 36 Bucket horizontal
inch 47.24 ± 1.42
5 Bucket wrist angle deg. 180 ± 3
6 Bucket bottom angle deg. Boom up, arm extend bucket
crowd
7 Distance to bucket tooth tip min. mm From swivel center
inch
8 Distance to bucket tooth tip Bucket bottom
horizontal
mm
inch
9 Item 7 to sprocket center mm
inch

I-S-40
13 10 Item 7 to blade mm
inch
11 Item 8 to sprocket center mm
inch
12 Item 8 to blade mm
inch
Q6 Swivel, swing performance
1 1 Swivel torque L kgf·m 255, 217 < Arm extend,slow/quick
kN·m 2.5, 2.1 <
ft·lbs 1844, 1569 <
2 R kgf·m 255, 217 <
kN·m 2.5, 2.1 <
ft·lbs 1844, 1569 <
2 1 Swivel capable angle at slope deg. 18 < Bucket load=JIS heaped x 1.8
3 1 Swivel block performance L / R deg. 30 >
4 1 Swivel slippage (Flat ground, no
load)
L / R deg. 90 deg swivel
deg.
5 1 Swivel start-up speed sec. 2.1 ± 0.2 0~90 deg swivel
6 1 Swivel torque, max. Left / Right kgf·m 255
N·m 2.5
ft·lbs 1844
7 1 Swing speed Left sec. 4.6 ± 0.3
2 Right sec. 3.7 ± 0.3
8 1 Swing Lock Swivel R&L mm 6 > 90 deg-swivel, 100 times actual
digging cylinder dislocationinch 0.24 >
2 Reciprocating
motion
L / R Swing mm 90 deg-swivel, 100 times
inch
Q7 Hydraulic performance
1 1 Relief pressure setting P1,P2 kgf/cm2 21.6 +1.0
-0.5
At pump delivery port 50 ± 5 °C
MPa 220.0 +10
-5
bar 215.7 +9.8
-4.9
psi 3128.4 +142
-71
2 P3 kgf/cm2 18.6 +1.0
-0.5
MPa 190.0 +10
-5
bar 186.3 +9.8
-4.9
psi 2701.8 +142
-71
3 P4 kgf/cm2 3.9 +1.0
-0.5
MPa 40.0 +10
-5
bar 39.2 +9.8
-4.9
psi 568.8 +142
-71
2 1 Swivel brake relief pressure kgf/cm2 At pump delivery port
MPa
bar
psi
3 1 Suction negative pressure kgf/cm2 At -10 °C
MPa
bar
psi

I-S-41
4 1 Boom relief pressure kgf/cm2 At +50 °C
MPa
bar
psi
5 1 Cylinder oil sealing capacity Boom mm 25 > Arm extend, bucket
inch 0.98 >
2 Arm mm 15 > height 1m, 10 min.
inch 0.59 >
3 Bucket mm 10 > Bucket load=JIS heaped*1.8
inch 0.39 >
4 Blade mm 25 >
inch 0.98 >
6 1 Boom cushioning performance 30°C sec. 3 >
2 50°C sec. 0.5 to 1.5
3 80°C sec. 0.3 <
7 1 Accumulator function time sec.
8 1 Service port flow No load L 27
US gal 8.14
2 Load L At 50 kgf/cm2
US gal
Q8 Lever operating force & stroke
1 1 Boom lever operating force up 1st kgf 1.4 ± 0.5 20 mm lower the lever top
N 13.7 ± 4.9
lbf 3.1 ± 1.1
2 up 2nd kgf
N
lbf
3 down kgf 1.4 ± 0.5
N 13.7 ± 4.9
lbf 3.1 ± 1.1
4 Arm lever Dump / crowd kgf 1.4 ± 0.5 Extend & crowd
20 mm lowerN 13.7 ± 4.9
lbf 10.1 ± 3.6
5 Bucket lever Dump / crowd kgf 1.4 ± 0.5 Dump & crowd
20 mm lowerN 13.7 ± 4.9
lbf 10.1 ± 3.6
6 Swivel lever L / R kgf 1.4 ± 0.5 Left & right
20 mm lowerN 13.7 ± 4.9
lbf 10.1 ± 3.6
7 Blade lever Up / down kgf 3.1 ± 0.5 Up & down
20 mm lowerN 30.4 ± 4.9
lbf 22.4 ± 3.6
8 Travel lever L/R
F / R
kgf 1.5 ± 0.5 F & R
20 mm lowerN 14.7 ± 4.9
lbf 10.8 ± 3.6
9 Accelerator lever kgf 3.4 ± 1.5 30 mm lower
N 33.3 ± 14.7
lbf 25 ± 10.8
10 Swing pedal kgf 7.0 ± 0.7
N 68.6 ± 6.9
lbf 15.4 ± 1.5

I-S-42
1 11 Safety lock lever, L&R up kgf 2.0 ± 1.0
N 19.6 ± 9.8
lbf 14.5 ± 7.2
down kgf 3.0 ± 1.0
N 29.4 ± 9.8
lbf 21.7 ± 7.2
12 Travel Hi-Lo change kgf - Electrical push - type switch on the
dozer leverN -
lbf -
13 Service port pedal L / R kgf 5.0 ± 1.0
N 49.0 ± 9.8
lbf 36.2 ± 7.2
14 Bonnet lifting force kgf
N
lbf
15 TPSS lever (PP - version) kgf 10.0 ± 1.0
N 98 ± 9.8
lbf 22 ± 2.2
2 1 Boom lever stroke up mm 72 ± 10 Tip of the grip
inch 2.83 ± 0.39
2 down mm 72 ± 10
inch 2.83 ± 0.39
3 Arm lever stroke mm 72 ± 10
inch 2.83 ± 0.39
4 Bucket lever stroke mm 74 ± 10
inch 2.91 ± 0.39
5 Swivel, swing lever stroke mm 74 ± 10
inch 2.91 ± 0.39
6 Blade lever up & down mm 80 ± 10
inch 3.15 ± 0.39
7 Travel lever, F & R L mm 75 ± 10
inch 2.95 ± 0.39
R mm 75 ± 10
inch 2.95 ± 0.39
8 Accelerator lever stroke mm 99
inch 3.9
9 Swing pedal stroke mm 6 ± 10 Pedal edge
inch 0.24 ± 0.39
10 Service port pedal stroke mm 12 ± 10
inch 0.47 ± 0.39

I-S-43
Q9 Stability
1 1 Tipping load/distance of load
point to tipping point
Front, Blade up kgf·m Arm extend, bucket crowd
N·m
ft·lbs
2 Front, Blade
down
kgf·m
N·m
ft·lbs
3 Rear, Blade up kgf·m
N·m
ft·lbs
4 Side
(variable track)
kgf·m
N·m
ft·lbs
2 1 Dynamic operation limit slope
angle
STD arm deg. Swivel angle=0 deg. Blade up ,
side direction2 Long arm deg.
3 Telescopic arm deg.
3 1 Bucket limited
load, static
Extended Side kgf 180, 162< Front horizonal, bucket crowd arm
tip end load swing straifht dozer
up.
Bucket weight 37 kgf isn’t included.
N 1765, 1558<
lbs 397, 357<
2 Forward kgf 190, 175<
N 1863, 1715<
lbs 419, 386<
3 Retracted Side kgf 105, 95<
N 1030, 931<
lbs 231, 209<
N 1912, 1715<
lbs 430, 386<
4 1 Bucket limited
load, slow opera-
tion
Extended Side kgf 135, 121< Arm extended, bucket crowd,
dozer up swing straight.
Bucket weight 37 kgf isn’t included.
N 1324, 1186<
lbs 298, 267<
N 1422, 1274<
lbs 320, 287<
3 Retracted Side kgf 70, 63<
N 686, 619<
lbs 154, 139<
N 1422, 1274<
lbs 320, 287<
Q10 Comfortability
1 1 Noise level At opera-
tor's ear LPA
Canopy dB(A) 78> / 79>
2 Cab dB(A) - Cab door close
3 Noise source± LWA dB(A) 92 >

II-S-1
II.Machine Body
A.Front attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-3
a. Pin, bush and shim installation . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-3
b. Instruction to press in the bushing . . . . . . . . . . . . . . . . . . . . . . . . II-S-7
c. Greasing points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-12
B.Upper Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-17
a. Swivel bearing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-17
b. Travel lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-18
c. Accelarator lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-21
d. Dozer lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-23
e. Control link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-24
f. Swing pedal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-25
g. Service port pedal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-26
h. Pilot control valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-27
i. Limit switch installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-29
j. Seat and Seat belt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-30
k. Wrist rest. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-31
l. Canopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-32
m. Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-33
C.Undercarrige . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-34
a. Track tension device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-34
b. Track Roller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-36

II-S-3
A.Front attachment
a. Pin, bush and shim installation
(1)Swing cylinder, swing bracket, boom
21
22
23 24
30
31
32
33 36
40414243
50
5152
53
60
61 62
707172
10
11
12
14 15
3435
13
20
Swing bracket - swivel frame
Code No. Q’ty Part No. Remarks
RB2386645 2 Pin 10 φ 50 (φ 1.97in)
RB2386639 2 Bush 11 506037
RB2386638 2 Bush 12 506028
RB2384113 2 Bush 13 506040
0117361204 2 Bolt 14
0257250120 2 Nut 15
Swing bracket - boom cylinder
RB2386664 1 Pin 20 φ 35 (φ 1.38in)
RB2386659 1 Bush 21 354332
RB2386637 1 Bush 22 354348
0117361080 1 Bolt 23
0257450100 1 Nut 24
Swing bracket - boom
RB2386656 1 Pin 30 φ 35 (φ 1.38in)
RB2386646 2 Bush 31 354535
RB2376657 1 Bush 32 354344
RB2376658 1 Bush 33 354344
0117361204 1 Bolt 34
0257450100 1 Nut 35
0661115010 1 Grease nipple 36
Swing bracket - Swing cylinder
RB2386746 1 Pin 40 φ 30 (φ 1.18in)
0113361020 1 Bolt 41
691816644 1 Spacer 42
535825356 1 Washer 43
Boom - boom cylinder
RB2386664 1 Pin 60 φ 35 (φ 1.38in)
0117361080 2 Bolt 61
0257450100 1 Nut 62
Boom - arm cylinder
RB2386654 1 Pin 70 φ 30 (φ 1.18in)
0117361080 2 Bolt 71
0257450100 1 Nut 72
Swing bracket - Swing cylinder
RA22166481 1 Pin 50 φ 30 (φ 1.18in)
0113361020 1 Bolt 52
6718166441 Spacer 54
5358253561 1 Washer 55

II-S-4
(2)Arm, bucket link
80
818283
84
90
9192
100
101102
110
112113
114 111
120
123124125
122
121
130131
134
132133
140142
141143144145
126
146
Boom - arm
RB2386663 1 Pin 80 φ 30 (φ 1.18in)
687216652Δ 2 Bush 81 303835
0117361080 1 Bolt 82
0257450100 1 Nut 83
Arm - arm cylinder
RB2386665Δ 1 Pin 90 φ 30 (φ 1.18in)
0117361065 1 Bolt 91
0257450100 1 Nut 92
Arm - bucket cylinder
RB2386665 1 Pin 100 φ 30 (φ 1.18in)
0117361065 1 Bolt 101
0257450100 1 Nut 102
Arm - bucket link2, 3
RB2386675 1 Pin 110 φ 30 (φ 1.18in)
687216652 2 Bush 111 303835
0117361080 1 Bolt 112
0211860100 2 Nut 113
Arm - bucket
RA22166761 1 Pin-EU 120 φ 30 (φ 1.18in)
RB2386676Δ 1 Pin-PP 120 φ 30 (φ 1.18in)
687216652Δ 2 Bush 121 303835
RA11167331 2 Dust seal 122
0113361225 1 Bolt 123
0401560120 1 Plain washer 124
6874166921 1 Spacer 125
Bucket link1 - link2, 3
RB23866771 1 Pin 130 φ 30 (φ 1.18in)
RB23866781 2 Bush 131 303840
0117361080 1 Bolt 132
0211860100 2 Nut 133
Bucket link1 - bucket
RA22166761 1 Pin-EU 140 φ 30 (φ 1.18in)
RB2386676Δ 1 Pin-PP 120 φ 30 (φ 1.18in)
6872166521 2 Bush 141 303835
RA11167331 2 Dust seal 142
0113361225 1 Bolt 143
0401560120 1 Plain washer 144
6874166921 1 Spacer 145

II-S-5
(3)Blade, blade cylinder and truck cylinder
150151152153 154
160
161162163
170
171172173
180
181
190191 192
182
Truck frame - blade
RA21174441 2 Pin 150 φ 30 x 102.5L
(φ 1.18 x L4.04 in)
0113361020 2 Bolt 151
6918166441 2 Collar 152
5358253661 2 Washer 153
Truck frame - blade cylinder
RB2387446 1 Pin 160 φ 30 x 84.5L
(φ 1.18 x L3.33 in)
0113361020 1 Bolt 161
5358253661 1 Collar 162
0661625010 1 Washer 163
Blade - blade cylinder
RB2387446 1 Pin 170 φ 30 x 84.5L
(φ 1.18 x L3.33 in)
0113361020 1 Bolt 171
5358253661 1 Collar 172
0661625010 1 Washer 173
Truck frame - truck cylinder
RA21121441 2 Pin 180 φ 30 x 95L
(φ 1.18 x L3.54 in)
691912129 2 Bolt (Stopper) 181
0451260120 2 Washer 182
Blade - extention blade
RA21121441 2 Pin 190 φ 25 x 113L
(φ 0.98 x L4.45 in)
0552551000 2 Split pin 191
RG1088948 2 Pin 192

II-S-6
(4)Clearance adjustment
(1) 68721-6697 Shim (0.5, 60-31) SPCC
68051-6633 Shim (1.0, 60-31) SPCC
68051-6634 Shim (1.6, 60-31) SPCC
Selective use
* Insert a number of shims according to the clearance on the
swing cyl bottom side.
(2) RA211-6647 Shim (0.3, 70-36) SPCC
RB211-6762 Shim (0.5, 70-36) SPCC
68741-6688 Shim (1.0, 70-36) SPCC
68741-6689 Shim (1.6, 60-36) SPCC
RA211-6649 Shim (2.0, 70-36) SPCC
}Selective use
(3) RB238-6644 Thrust collar (2.3, 92-51) SK5M
* Refer to the mounting method of thrust collar.
(4) RB238-6644 Thrust collar (2.3, 92-51) SK5M
RB238-6648 Thrust collar (2.0, 92-51) SK5M
RB238-6649 Thrust collar (2.5, 92-51) SK5M
}Selective use
* Refer to the mounting method of thrust collar.
(5) RG401-6762 Shim (0.5, 70-36) SPCC
(6) 68721-6697 Shim (0.5, 60-31) SPCC
68051-6633 Shim (1.0, 60-31) SPCC }Selective use
(7) 68721-6697 Shim (0.5, 60-31) SPCC
(8) 68721-6697 Shim (0.5, 60-31) SPCC
(9) 68721-6697 Shim (0.5, 60-31) SPCC
(1)
(3)
(4)
(5)
(2)
(6)
(7)
(8)
(9)
1. Front Play
* Pin on fulcrum
Thrust direction
Clearance
0.6 mm (0.023 in) max.
* If the play exceeds 0.6
mm, add some shims
and make adjustments.
(Use the shims shown in
the illustration.)
2. Vertical clearance
between swivel frame
and swing bracket.
+ 0.3 ~ +1.3 mm
(+ 0.012 ~ +0.051 in)
3. Use the shim and
thrust collar selec-
tively with each part.
4. Installation of thrust
collar
Apply grease on both sur-
face.
Apply grease
A clearance of 1-2 mm to be ensured
between lock-bolt tightened face and nut
Lock nut type Double nut type

II-S-7
b. Instruction to press in the bushing
(1)Bush installation steps
(2)Installing direction of dust seal
(1)(1)
(2)
(2)
(2)
Part where bushing and dust seal are inserted.
(Completed assembly with bushing press-fit is excluded.)
(1) Both bushing and dust seal
(2) Only bushings
1. Bushing insertion Insert the bushing by using an
appropriate steel plate.
* Do not directly hit the bushing.
2. Bushing insertion
dimension
1) If no dust seals are used,
check that the bushing does
not protrude from either side.
2) Maintain room for a dust seal
on each side if it is used.
(Only the dimension manage-
ment of the press-fit direction
can be enough.)
3. Dust seal mounting
direction
Mount as shown in the illustration.
4. Bushing insertion
direction
Insert the bushing from the 15°
chamfer side.
Bush Dust Seal
Toward the Bushing
OutSide
(Enlarged view of dust seal)
Install the dust seals in the direction as shown
at left. If in the wrong direction, the sealing
effect is adversely affected, which may get the
pins worn out earlier.
55
15
3
C
0.5
C
0.5
15
3Dust seal Dust seal
Bush
Bush direction Bush direction
Press in
Bush
Jig

II-S-8
(3)Installation of thrust collar on the swing bracket
1. Install the thrust collar, with its grooved face downward, on top of the swivel frame.
2. Select and install a 0.5 or 1.0 mm(0.02 ~ 0.04”) thick shim to have the clearance smaller than 0.5
mm(0.02”).
Thrust collar
090 : 2.3 mm (0.09 in)
095 : 2.3, 2.0, 2.5 selective
Shim
200 : 0.5, 1.0, 1.6 selective
Thrust collar

II-S-9
(4)Swing bracket pin & bush.
(1) Attention to the bush driving direction (align the holes). Make
sure later that the shaft goes through smoothly.
(2) Keep flush with the end face.
(3) Keep the collar upward.
(4) Attention to the bush driving direction (align the holes). Make
sure later that the shaft goes through smoothly.
Specifications, New pin and bushing
[ Unit : mm (inch)]
pin : High frequency induction surface hardening/
Effective hardened depth : 2 ~ 4mm (0.08” ~ 0.16”)
Surface hardness : 52 ~ 59 HRC
Diameter value is for single part before installation.
(1)
(2)
(3)
(4)
(2)
(3)
1Bush
2Dust seal
3Collar
1
23
Model KX008-3, U10-3 KX36-3, KX41-3S, V U15, U15-3 U20-3, U25-3 Remarks
Pin outer dia. 35 ( 1.38 ) 50 ( 1.97 ) ← 60 ( 2.36 )
Pin material S45C-D, S43C-D ← ← ←
Bush inner dia. 35 ( 1.38 ) 50 ( 1.97 ) ← 60 ( 2.36 )
Bush outer dia. 43 ( 1.69 ) 60 ( 2.36 ) ← 72 ( 2.83 )
Bush material STKM16A
S43C
S45C
← ← ←
Thrust washer, shims
thickness
Thrust collar
: 2.0, 2.3, 2.5
Shim : 0.5, 1.0, 1.6
←
Thrust collar
: 2.8, 3.2
Shim : 0.5, 1.0, 1.6
Swing bracket material FCD500-7 ← ←
Test pin, to go through
smoothly
- 49.95 ( 1.967) ← -
o -0.05
-0.08 o -0.002
-0.003 o -0.05
-0.08 o -0.002
-0.003 o -0.05
-0.08 o -0.002
-0.003
o +0.07
+0.04 o +0.011
+0.006 o +0.07
+0.04 o +0.011
+0.006 o +0.07
+0.04 o +0.011
+0.006
o +0.09
+0.06 o +0.004
+0.002 o +0.09
+0.06 o +0.004
+0.002 o +0.09
+0.06 o +0.004
+0.002
o o

II-S-10
(5)Measuring the swing bracket looseness
Set a dial gauge as shown below and note the height of the pointer. Lift the machine front until the swing
bracket tilts to maximum frontward. Now set the dial gauge reading to zero.
Next move the boom and arm until the swing bracket tilts to maximum backward. Now take the dial
gauge reading.
There is no specifications yet. This measuring data is just for your reference.
Swing bracket looseness measuring procedure photos

II-S-11
(6)Service tip to ease customer complain
Front slaggishness caused by pin-bushing worn-out largely depends on the following facters.
1. Maintenance: Daily maintenance, frequent applying of grease to renew, proper type of
grease.
2. Attachment installed: Weight of front attachment more than expected affects the excessive wear
of pin and bushing.
3. Application and operation:Heavy load digging operation and high rate of vibration work, such as
breaker also causes the abrasive wear than ordinary digging work.
4. Job site and strage: Dust, sand, moisture, salt or chemical acid accelerate the surface abrasive
and corrosion.
5. Total operation hours: Operating hour is the basic factor to evaluate the wear. Bushing wear-
curve is basically depended on the operation hours. And varies one by one
according to the ratio of oparating condition, attachment weight, applica-
tion and maintenance level mentioned-above.
6. Service limit: Allowable service limit to all pins and bushings is 1.0 mm (0.039 in) wear
from the new diameter size.

II-S-12
c. Greasing points
1) Keep applying grease until it comes out of the circumference at the
other end surface of each rotating part.
2) Apply grease to the end surfaces of all the rotating parts and their
related shims.
(1) View from the front (5) A - type (Boss - greasing)
(2) Swing cylinder, bottom (6) A - type (Pin - greasing)
(3) Swivel bearing, ball (7) B - type (Boss - greasing)
(4) Swivel bearing, teeth (8) C - type (Boss - greasing)
A-type: Straight type
(06611-15010)
B-type: 67°
(06616-25010)
C-type: 90°
(06616-35010)
(2) (3) (4)
(1)
Turn the swivel bearing every 90 degrees
and lubricate the balls and tooth faces (8
locations in total). If already disassembled,
the balls and tooth faces may be lubri-
cated before being reassembled.
(5)
(5)
(5)
(5)
(5) (8)
(7)
(6)
(5)
(5)
(6)
(6)
(3)
(4)

II-S-13
(5) A - type (Boss - greasing) (7) B - type (Boss - greasing)
(7)
(7)
(5)
(7)

II-S-14
Q’ty
(1) Frame (Truck, center) 1
(2) Frame (Truck, L) 1
(3) Frame (Truck, R) 1
(4) Bolt, stopper 4
(5) Spring washer 4
(6) Apply grease on all surfaces of truck frame
L & R as shown by hatching lines.
1
4 5
3
2
Stopper bolt 4
Thread adhesive applied
in 4 locations
Set-bolt 6
2 locations at the back
of machine

II-S-15
Stopper bolt
Model Code No. Bolt Tightening torque
Tip-end dia.
ø
Across
flats length
[mm]
K008-3
U10-3
U15, U15-3
KX41-3V
69191-2129-3
M12 x 1.25
(7T)
77.5 ~ 90.2 N·m
(7.90 ~ 9.20 kgf·m)
57.1 ~ 66.5 ft·lbf
10 17
U17
U17-3
U17-3α
RA231-21292
M20 x 1.5
367.7 ~ 431.5 N·m
(37.5 ~ 44.0 kgf·m)
271.2 ~ 318.2 ft·lbf
17 27
(1)
(1) Advanced Double Sheathed-box Structure
1. Remove the two 9bolts (stopper) when
detaching the track frame (right & left)
from the center one.
2. Apply grease over the stretching part of
track frame (right & left) when installing.
(Use one which equivalent to Dynamax
EP2)
Track Width Variable StructureTrack frame (left) detached
3. Tightening torque for the plate: 48.1~55.9 N·m
(4.9~5.7 kgf·m) 35.1~41.1 ft·lbf
*Use screw lock agent
8 0.2
10
(1)
0
-0.2
+- 25 0.5+-
11 0.3+-
0.6
M12x1.25
27
13
17 0
-0.2
M20x1.5
41

II-S-16
(2)
(3)
(4)
(1)
100
090
010
110
120
050
060
070 080
070
080
060
040
040
050
030
020
RA228-022-12
OLD PART
RA228-804-10
140
130
(1) View from the bottom of the
track frame
(2) Track cylinder
(3) To track cylinder rod side
(4) To track cylinder bottom side
(5) Keep the clearance more than
1 mm (0.04“) and less than 10
mm (0.4“) between the plate
and hose after adjusting the
adaptor’s angle.
(6) Fix the hose with vyneel clamp.
Keep the clearance more than
10 mm (0.4“) adjusting the
track cylinder rod side.
Q’ty
010 Frame,track center 1
020 Frame,track LH 1
030 Frame,track RH 1
040 Cover, motor 2
050 Bolt,flange 6
060 Pin 2
070 Bolt, stopper 2
080 Washer,spring 2
090 Cover, bottom 1
100 Bolt 4
110 Bolt, stopper 4
120 Washer,spring 4
(5)
(6)

II-S-17
B.Upper Structure
a. Swivel bearing
1. Innerring soft zone: S mark.
• Set “S” mark at its right position.
2. Outer-ring soft zone: Ball inlet
• This soft zone should be at its left sode.
3. Align the grease nipple hole of the swivel frame with the nipple on the bearing.
4. Swivel Bearing Tightening
• Apply Locktite #271 on the bolts.
• Tightening torque: 103 ~ 117.7 N·m
10.5 ~ 12 kgf·m
75.9 ~ 86.8 ft·lbs
• Apply grease to the entire surface of the bearing teeth uniformly.
• Mounting bolts: Truck frame side, 01138-51230, 18 pcs
Swivel frame side, 01138-51230, 19 pcs
1
2
3
Front
Pass between the hoses
(selector valve - SJ).
A
B
Swing
cylinder
Tooth
face Ball
Selector
valve
Machine front
Direction of the swing
cylinder's grease adaptor
Horizontal
ＳＳ
(1) Machine rear
(2) Marked “S“ (Soft zone of inside gear)
(3) Machine front
(4) Grease supply port (Must be faced to the
swivel frame hole)
(5) The ball inlet (Soft zone of outer race)
(6) Grease supply to teeth
(2)
(3)
(4)
(1)
(5)
(6)
A

II-S-18
b. Travel lever
Stopper bolt details
(7) (9.5)
Front
2 5Grip-to-grip clearance
Lever (travel, left)
Lever (travel, right)
Grip
(34.5)
67156-1833
RA221-6531
RA221-6532
1. Adjustments of
lever to neutral
position
Mounting direc-
tion and angle
Mount the levers as
shown in the illus-
tration.
Improper position
↓
Improper control
2. Travel lever rota-
tion
The levers must
return to the neu-
tral position
promptly after oper-
ation.
Improper return
↓
Improper action
3. Travel lever
adjustments
1) Forward/
Backward
tolerance of
left and right
levers
2) Clearance of
left and right
levers
→ 5 mm (max.)
(0.2 in)
→ 5 ~ 25 mm (EU)
(0.2 ~ 0.98 in)
5 ~ 14 mm (KTC)
(0.2 ~ 0.55 in)
Levers not aligned
↓
Contact between
levers
Improper action
4. Grip mounting
Mounting direc-
tion and angle
Mount the grips
securely.
The grips must be
in backward/for-
ward directions.
Improper assembly
↓
Grips rotate
5. Check items
after mounting
The valve spool
must operate full
stroke.
The valve spool
must operate
smoothly.
Improper action
↓
Increase in required
operational power
To-and-fro differences of the right and left travel
levers
Lever position To-and-fro difference ( )
Forward and
backward ends
Within 10 mm (0.39 in.) each
Neutral Within 5 mm (0.21 in.)
Travel lever adjustment
Top view Front view
Link (MB)
RA221-6561Δ
Set up with the end
groove vertical.
Parallel

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for your reading.
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KUBOTA U15 MICRO EXCAVATOR Service Repair Manual