Caterpillar cat 308 c cr mini hydraulic excavator (prefix kcx) service repair manual (kcx00001 and up)

Service Repair Manual
Models
308C CR Mini Hydraulic
Excavator

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Product: MINI HYD EXCAVATOR
Model: 308C MINI HYD EXCAVATOR KCX
Configuration: 308C CR Excavator KCX00001-UP (MACHINE) POWERED BY 4M40 Engine
Disassembly and Assembly
308C Excavator Machine Systems
Media Number -RENR5848-02 Publication Date -01/11/2007 Date Updated -12/11/2007
i01701366
Bucket - Install
SMCS - 6101-012
Installation Procedure
Note: Make sure that the stick pin bore, the bucket pin bores, the bucket pins, the flange and the O
-ring seals are thoroughly clean prior to installation of the bucket.
Illustration 1 g00880328
1/3308C CR Excavator KCX00001-UP (MACHINE) POWERED BY 4M40 Engine(SEB...
2020/1/18https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

1. Check the condition of O-ring seals (7). If the O-ring seals are worn or damaged, use new
parts for replacement.
2. Put a thin coat of 5P-0960 Molybdenum Grease on the outside machined surface of flange
(11). Put a thin coat of 5P-0960 Molybdenum Grease in the bore of flange (11). Install
flange (11) in the bucket. Install dowel (12) in the flange.
3. Lower the stick into the bucket and align the pin bores. Move the bucket until one side of
the bucket makes contact with the stick. Measure the clearance between the bucket and the
stick at flange (11). Add a minimum of three shims between plate (9) and flange (11). Add
shims until the clearance between the stick and the bucket is 0.5 mm (0.02 inch) to 1.0 mm
(0.04 inch).
4. Put a thin coat of 5P-0960 Molybdenum Grease on bucket pin (6). Install bucket pin (6) and
O-ring seals (7). Align the retaining bolt hole in the bucket pin with the retaining bolt hole
in the bucket. Install the retaining bolt and nuts (2).
5. Align the pin bore in link assembly (1) with the pin bores in the bucket.
6. Put a thin coat of 5P-0960 Molybdenum Grease on bucket pin (4). Install bucket pin (4) and
O-ring seals (3).
7. Align the retaining bolt hole in the bucket pin with the retaining bolt hole in the bucket.
Install retaining bolt (5) and the nuts.

8. Tighten retaining nuts (2) and (5). Position the outside nut even with the end of the retaining
bolt or 0.5 mm (0.02 inch) beyond the end of the retaining bolt. Tighten the inside nut
against the outside nut to a torque of 70 ± 15 N·m (50 ± 10 lb ft).
9. Lubricate the bucket control linkage. Refer to Operation and Maintenance Manual,
SEBU7421, "Bucket Linkage - Lubricate" for the correct procedure.
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Sat Jan 18 17:26:20 UTC+0800 2020

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i01944367
Bucket Linkage - Remove
SMCS - 6513-011
Removal Procedure
When the pin assembly is removed, the linkage assembly may swing out
of the bucket. To prevent possible personal injury, do not stand in front
of the linkage assembly when the pin assembly is being removed.
1. Position the bucket and the stick on the ground.
2. Remove retaining bolt (4) and nuts (2) from bucket pin (3).

3. Remove bucket pin (3). Link assembly (1) will swing forward when the bucket pin is
removed.
4. Attach a suitable lifting device to link assembly (1). Attach a suitable lifting device to the
left and right link assemblies (8) and (9). Raise link assembly (1) until the link assembly is
in a horizontal position.
5. Remove nuts (7) and retaining bolt (5) from pin (6). Remove pin (6) from the link
assemblies and the rod end of the bucket cylinder. Remove link assembly (1). The weight of
link assembly (1) is approximately 85 kg (190 lb).
6. Remove nuts (10) and retaining bolt (11) from pin (12). Use a hammer and a punch to drive
pin (12) into the stick until the left hand link assembly is free. Remove the left link
assembly. Remove pin (12) from the stick and right link assembly. Remove the right link
assembly.
Sat Jan 18 17:27:17 UTC+0800 2020

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i01701657
Bucket Linkage - Install
SMCS - 6513-012
1. Apply 5P-0960 Molybdenum Grease on the bearings and seals in the stick and link
assembly.
2. Position the right link assembly and left link assembly (3). Move the left link assembly until
the link assembly makes contact with the stick. Move the right link assembly away from the
stick. Measure the clearance between the right link assembly and the stick. The clearance
should not be more than 0.8 mm (0.03 inch). If the clearance is less than 0.8 mm
(0.03 inch), the addition of shims will not be required. Apply 5P-0960 Molybdenum Grease
on pin (4), and install the pin. Align the retaining bolt hole in pin (4) with the retaining bolt
hole in left link assembly (3). Install retaining bolt (2) and nuts (1).
3. If the clearance is more than 0.8 mm (0.03 inch), the addition of shims will be required.
Install the shims that are required between the right link assembly and the stick. Apply 5P-
0960 Molybdenum Grease on pin (4), and install the pin. Align the retaining bolt hole in pin

(4) with the retaining bolt hole in left link assembly (3). Install retaining bolt (2) and nuts
(1).
4. Prior to installing link assembly (7), be sure that the grease fitting in the rod end of the
bucket cylinder is facing away from the stick.
5. Attach a suitable lifting device to link assembly (7), the right and left link assemblies (6)
and (10). The weight of link assembly (7) is approximately 85 kg (190 lb). Position the link
assemblies on the rod end of the bucket cylinder. Apply 5P-0960 Molybdenum Grease on
pin (8). Install the pin that connects the link assemblies together. Align the retaining bolt
hole in pin (8) with the retaining bolt hole in the left link assembly. Install retaining bolt (5)
and nuts (9).
6. Apply 5P-0960 Molybdenum Grease on bucket pin (12). Position the link assembly at the
bucket and install bucket pin (12) and the O-ring seals. Align the retaining bolt hole in
bucket pin (12) with the retaining bolt hole in the bucket. Install retaining bolt (13) and nuts
(11).

7. Tighten retaining nuts (9), (11) and (1). Tighten the outside nut until the nut is 0.5 mm
(0.02 inch) beyond the end of the retaining bolt. Tighten the inside nut against the outside
nut to a torque of 70 ± 15 N·m (50 ± 10 lb ft).
8. Lubricate the pins for the bucket control linkage. Refer to Operation and Maintenance
Manual, SEBU7421, "Bucket Linkage - Lubricate" for the proper procedure.
Sat Jan 18 17:28:14 UTC+0800 2020

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i01701823
Bucket Cylinder - Remove
SMCS - 5457-011
Removal Procedure
At operating temperature, the hydraulic oil is hot and under pressure.
Hot oils can cause burns.
To prevent possible personal injury, release the pressure in the
implement hydraulic circuit (boom, stick, bucket, and swing), travel
circuits, and the hydraulic oil tank at the filler cap before any hydraulic
lines or components are disconnected or removed.
Remove the filler cap only when the engine is stopped and the filler cap
is cool enough to touch.
NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and repair
of the product. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component
containing fluids.
Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop
Products Guide" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.
Note: Put identification marks on all hose assemblies for installation purposes. Plug all hose
assemblies. This helps to prevent fluid loss, and this helps to keep contaminants from entering the
system.
1. Fully extend the stick and the bucket. Lower the stick and the bucket to the ground.
2. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic
System Pressure - Release".
3. Attach a suitable lifting device to the rod end of the bucket cylinder. Put a wood block (3)
under the link assemblies as a support.
4. Remove the nuts and retaining bolt (1). Remove pin (2).
5. Attach a suitable lifting device to the head end of the bucket cylinder. Raise bucket cylinder
(4) until the cylinder is level.

6. Disconnect hose assemblies (5) from the bucket cylinder.
7. Remove nuts and retaining bolt (6). Remove pin (7). Remove the bucket cylinder. The
weight of the bucket cylinder is approximately 50 kg (110 lb).
Note: Shims may be used between the stick and the bucket cylinder. These shims are used
to adjust the lateral clearance between the components at the pin joint. Put identification
marks on all shims for assembly purposes.
8. Remove the shims that are used at the pin joint for the bucket cylinder.
Sat Jan 18 17:29:11 UTC+0800 2020

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i01702272
Bucket Cylinder - Install
SMCS - 5457-012
NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and repair
of the product. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component
containing fluids.
Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop
Products Guide" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
1. Be sure that the pin bores in the stick, in the link assemblies, and in the bucket cylinder are
clean and free of dirt prior to installation of the bucket cylinder.

2. Attach a suitable lifting device to bucket cylinder (4), and position the bucket cylinder on
the stick. Be sure that the grease fittings in the head end and in the rod end of the bucket
cylinder are facing away from the stick.
3. Slide the bucket cylinder to one side until the bucket cylinder makes contact with the stick.
Measure the total clearance between the bucket cylinder and the stick at the pin bore. The
total clearance of Measurement (a) plus Measurement (b) must not be more than 1.0 mm
(0.04 inch). If the total clearance is less than 1.0 mm (0.04 inch), the addition of shims
between the bucket cylinder and stick will not be required. Apply 5P-0960 Molybdenum
Grease on pin (7) and install the pin. Install retaining bolt (6) and the nuts.

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Top View Of Stick And Bucket Cylinder
4. If the total clearance is more than 1.0 mm (0.04 inch), the addition of shims between the
bucket cylinder and the stick will be required. Install the shims between the stick and the
bucket cylinder. The shims should be installed on the side of the retaining bolt. Apply 5P-
0960 Molybdenum Grease on pin (7) and install the pin. Install retaining bolt (6) and the
two nuts.
5. Lower the bucket cylinder between the link assemblies. Apply 5P-0960 Molybdenum
Grease on pin (2) and install the pin. Install retaining bolt (1) and the nuts.

6. Rotate pin (2) until the retaining bolt is parallel with the link assembly. Tighten the outside
nut until the nut is 0.5 mm (0.02 inch) beyond the end of the retaining bolt. Tighten the
inside nut against the outside nut to a torque of 70 ± 15 N·m (50 ± 10 lb ft).
7. Check the condition of the O-ring seals in the ends of hose assemblies (5) prior to
installation. If the seals are damaged, use new parts for replacement. Connect two hose
assemblies (5) to the bucket cylinder.
8. Fill the hydraulic oil tank with oil. Refer to Operation and Maintenance Manual,
SEBU7421, "Hydraulic Oil Level - Check". Lubricate the bucket cylinder pins. Refer to
Operation and Maintenance Manual, SEBU7421, "Bucket Linkage - Lubricate".
9. Start the machine, and run the machine at low idle speed. Remove wood block (3). Extend
the bucket cylinder to the halfway position. Retract the cylinder rod. The cylinder should be
cycled in this manner for approximately ten cycles in order to remove the air from the
hydraulic system. Recheck the oil level in the hydraulic oil tank.

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i01773034
Stick Cylinder - Remove
SMCS - 5458-011
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1U-8222 Sling 2
B
4C-6486 Stand 1
8S-7641 Tube 1
8S-8048 Saddle 1
C
6V-9510 Face Seal Plug 1
6V-9831 Cap As 1
SERVICE DATA: TOOLING (C) WILL NOT BE IDENTIFIED IN PHOTOGRAPHS IN
THE REMOVAL OR THE INSTALLATION. THIS TOOLING IS SHOWN IN ORDER
TO ASSIST THE EXPERIENCED SERVICEMAN.
Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the
component should be thoroughly cleaned. This will help to prevent dirt from entering the internal
mechanism.
At operating temperature, the hydraulic oil is hot and under pressure.
Hot oils can cause burns.

Caterpillar cat 308 c cr mini hydraulic excavator (prefix kcx) service repair manual (kcx00001 and up)

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