Caterpillar Cat 345D L Excavator (Prefix MLK) Service Repair Manual Instant Download.pdf

Service Repair Manual
Models
345D L Excavator

Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 345D L EXCAVATOR MLK
Configuration: 345D L Excavator MLK00001-UP (MACHINE) POWERED BY C13 Engine
Disassembly and Assembly
345D, 349D and 349D2 Excavators and 345D MHPU and 349D MHPU Mobile
Hydraulic Power Units Machine Systems
Media Number -RENR9574-10 Publication Date -01/08/2014 Date Updated -18/09/2018
i03778971
Travel Motor - Assemble
SMCS - 4351-016
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 3E-3879 Eyebolt 1
D 4C-8359 Eyebolt 1
F 1P-1862 Pliers 1
G 1P-0510 Driver Group 1
J 4C-4030 Thread Lock Compound 1
K 180-6533 Seal Driver 1
L 6V-7030 Micrometer Depth Gauge 1
M 8T-0447 Calipers 1
N 1U-6396 O-Ring Assembly Compound 1
NOTICE
Keep all parts clean from contaminants.
Contamination of the hydraulic system with foreign material will
reduce the service life of the hydraulic system components.
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https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

To prevent contaminants from entering the hydraulic system, always
plug or cap the lines, fittings, or hoses as they are disconnected. Cover
any disassembled components and clean them properly before
assembly.
Clean the hydraulic system properly after any major component
exchange or especially after a component failure, to remove any
contamination.
Note: If a failure occurs, an accurate diagnosis of the cause can prevent a recurrence. Information
is available to analyze failures for piston pumps and motors. Refer to Special Publication,
SEBD0641, "Analyzing Axial Piston Pump and Motor Failures".
Note: Inspect all parts. If any parts are worn or damaged use new parts for replacement. The
installation of used parts during reconditioning is acceptable. Reuse and salvage information is
available on piston pumps. Refer to Guideline For Reusable Parts and Salvage Operations,
SEBF8032, "Piston Pumps and Motors". During reconditioning, correct any conditions that might
have caused the original failure.
Note: O-ring seals , gaskets, and seals should always be replaced. A used O-ring seal may not
have the same sealing properties as a new O-ring seal. Use Tooling (H) during the assembly
procedure.
Note: Apply a light film of "10W" oil to all components before assembly.
Illustration 1 g01204890
1. Install O-ring seal (34) on plug (33).
2. Install piston (32) and the plug in the travel motor body. Tighten the plug to a torque of
430 ± 40 N·m (317 ± 30 lb ft).
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3. Apply a thin coat of Tooling (J) on the outer surfaces of lip seal (31).
4. Use Tooling (K) and a suitable hammer to drive the lip seal into the travel motor body.
Drive the seal downward until Tooling (K) makes contact with the travel motor housing.
5. Use Tooling (F) to install retaining ring (30) to the shaft end of the travel motor body.
6. Install keys (29) inside the travel motor body.
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7. Assemble washers (25), inner spacer (28) and outer spacer (27) in the proper orientation, as
shown.
8. Use Tooling (L) to measure the distance from the outer spacer to the surface of the table.
The distance should be 22.1 ± 0.6 mm (0.87 ± 0.02 inch). If this measurement is off, check
orientation of the washers. If orientation is correct, replace washers and spacers with new
parts.
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9. Install inner spacer (28), washers (25), and outer spacer (27) to barrel (24).
10. Install guide (26) to the barrel.
11. Install piston assemblies (23) with retainer (22) in the piston assembly's original bore in
barrel (24).
12. Install cam plate (21) on the rotating group.
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13. Use a suitable press to install bearing (19) onto shaft assembly (18).
14. Use a suitable press in order to install inner race (20) onto shaft assembly (18).
Note: Place the two support plates under the lip of shaft assembly (18).
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15. Insert shaft assembly (18) in the rotating group.
16. Alternate disks (17) and separator plates (16) into the travel motor housing. Start with a
separator plate and end with a separator plate.
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17. Attach Tooling (D) to the shaft. Use a suitable lifting device in order to place barrel
assembly into the travel motor body.
Note: Align the notches of the cam plate with the keys in the travel motor body before you
lower the barrel assembly into the travel motor body.
18. Use Tooling (M) to measure the depth from the top surface of the travel motor body to the
bronze face of the barrel assembly. The distance should be 32.2 ± 2 mm (1.27 ± 0.08 inch).
If this measurement is off, check orientation of the barrel assembly. Also check if the cam
plate is properly seated on the keys.
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(15) O-Ring seals
19. Install O-ring seals (15) and the backup rings on the brake piston.
Note: Make sure that you install the backup ring and the O-ring seal in the original position.
Refer to Illustration 19.
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20. Install brake piston (14) in the body of the travel motor by hand. It may be necessary to use
a soft faced hammer to seat the brake piston correctly.
21. Use Tooling (M) to measure the distance from the top of the brake piston (14) to the top
surface of the travel motor body. The distance should be 20.8 ± 1.0 mm (0.82 ± 0.04 inch).
If this measurement is off, drive the brake piston further into the travel motor body.
22. Install springs (12) and plate (11).
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2020/6/24

23. Install O-ring seals (13).
24. Use Tooling (G) to drive the bearing into the head.
25. Install O-ring seal (9) onto the head.
26. Install port plate (8) on the head. It may be necessary to apply a small amount of grease to
the port plate in order to hold the port plate in place during the installation of the head.
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27. Turn over head (6). Install Tooling (A) onto the head. Use a suitable lifting device to install
the head onto the travel motor.
28. Install Pins (7) into the head.
29. Install an O-ring on each plug (5).
30. Install bolts (4) which hold the head in place. Tighten the six bolts to a torque of
530 ± 70 N·m (391 ± 52 lb ft).
31. Install plugs (5) that hold the pins in the head. Tighten the plugs to a torque of 75 ± 7 N·m
(55 ± 5 lb ft).
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32. Install O-ring seals (2) and rings (3) on the displacement change valve.
33. Install displacement change valve (1) onto the head of the travel motor. Tighten the
displacement change valve to a torque of 50 ± 3 N·m (37 ± 2 lb ft).
34. To prevent possible damage to the travel motor, the unit should be filled with oil at least up
to the fill port prior to operation. Refer to Operation and Maintenance Manual for the
correct oil specification.
End By:
a. Install the travel motor. Refer to Disassembly and Assembly, "Travel Motor - Install".
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Wed Jun 24 11:24:26 UTC+0800 2020
13/13
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Shutdown SIS
Previous Screen
Product: EXCAVATOR
i02429546
Travel Motor - Install
SMCS - 4351-012
Installation Procedure
Table 1
Required Tools
A -
Threaded Rod
M 20 X 2.5 by 18 inch
2
B 140-7742 Sleeve 1
Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned
in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts.
Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are
worn or damaged, use new parts for replacement.
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1. Install Tooling (A) as a guide. Attach Tooling (B) and a suitable lifting device onto travel
motor (4). The weight of travel motor assembly (4) is approximately 127 kg (280 lb).
Position travel motor assembly (4) and install bolts (3).
2. Install bolts (2). Connect hose assemblies (1).
End By:
a. Install the counterbalance valve. Refer to Disassembly and Assembly, "Counterbalance
Valve (Travel) - Install".
Wed Jun 24 11:25:23 UTC+0800 2020
2/2
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Shutdown SIS
Previous Screen
Product: EXCAVATOR
i02429611
Final Drive and Travel Motor - Remove
SMCS - 4050-011; 4351-011
Removal Procedure
Table 1
Required Tools
A Block 1
B
1U-6221 Hydraulic Torque Wrench Assembly 1
132-8154 3/4 inch Square Drive Link 1
132-8223 Power Pack 1
C 138-7575 Link Bracket 2
Note: The final drive sprocket does not need to be removed prior to removal of the final drive.
The sprocket must be removed in order to disassemble the final drive.
Note: The procedure to remove the right hand final drive and the procedure to remove the left
hand final drive is identical. The procedure that follows is for one of the final drives.
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.
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Refer to Special Publication, NENG2500, "Dealer Service Tool
Catalog" for tools and supplies suitable to collect and contain fluids on
Cat®
products.
Dispose of all fluids according to local regulations and mandates.
1. Release track tension. Refer to Operation and Maintenance Manual, "Track Adjustment -
Adjust".
2. Start the machine and position track roller (1) on Tooling (A). Make sure that the pin for
separating the track is positioned over the final drive.
3. Separate the track. Refer to Disassembly and Assembly, "Track - Seperate".
4. Drain the final drive. Refer to Operation and Maintenance Manual, "Final Drive Oil -
Change".
5. Remove the counterbalance valve. Refer to Disassembly and Assembly, "Counterbalance
Valve - Remove and Install".
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6. Attach two lifting slings and a suitable lifting device to final drive (2), as shown. It may be
necessary to adjust the lifting straps for correct balance of the final drive.
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7. Disconnect hose assemblies (3). Remove fittings (4) and bolts (5).
8. Use Tooling (B) to remove bolts (5) and the washers that hold the final drive to the
undercarriage frame assembly. Carefully remove the final drive and the travel motor from
the undercarriage frame assembly. The combined weight of the final drive and the travel
motor is 725 kg (1600 lb).
9. Invert final drive assembly (6) onto the cover, as shown.
10. Attach Tooling (C) and a suitable lifting device in order to remove travel motor (6). The
weight of travel motor assembly (6) is approximately 127 kg (280 lb). Remove travel motor
assembly (6).
Wed Jun 24 11:26:20 UTC+0800 2020
4/4
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Shutdown SIS
Previous Screen
Product: EXCAVATOR
i05331566
Final Drive - Disassemble
SMCS - 4050-015
Disassembly Procedure
Table 1
Required Tools
A 1P-2420 Transmission Stand Group 1
B 138-7573 Link Bracket 2
C 1P-1860 Retaining Ring Pliers 1
D 4C-8359 Eyebolt 3
E 4C-8359 Eyebolt 2
F 138-7574 Link Bracket 2
Start By:
A. Remove the final drive. Refer to Disassembly and Assembly, "Final Drive and Travel Motor
- Remove" in this manual.
1. Thoroughly clean the outside of the final drive and travel motor prior to disassembly.
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2. Remove coupling (1) from final drive (2) .
3. Attach a suitable lifting device to the final drive, and turn final drive (2) over 180 degrees.
The weight of final drive (2) is approximately 590 kg (1300 lb).
4. Attach the final drive to Tooling (A) . Put an alignment mark across the sections of the final
drive for assembly purposes. All parts must be reinstalled in the original locations.
5. Remove socket head screws (3) from the final drive cover.
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6. Attach Tooling (B) and a suitable lifting device to cover (5) , as shown. The weight of cover
(5) is approximately 52 kg (115 lb).
7. Remove bolts (4) and the washers that hold the cover in place.
8. Use a soft faced hammer in order to break the seal between cover (5) and the ring gear.
Remove cover (5) . The weight of cover (5) is 52 kg (115 lb).
9. Remove spacer (6) from the cover.
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10. Remove shims (7) from the cover.
11. Remove socket head bolts (8) and ring gear (9) from the cover.
12. Remove sun gear (10) from carrier assembly (11) . Remove carrier assembly (11) by lifting
the carrier assembly straight up.
13. Disassemble carrier assembly (11) , as follows:
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a. Remove spacers (12) . A spacer is located on each side of the sun gear in carrier
assembly (11) .
Note: Planetary gears (15) might be stamped with identification marks "L". Note the
position of the identification marks in relation to the carrier for assembly purposes.
b. Remove retaining ring (13) with Tooling (C) .
c. Remove thrust washers (14) and planetary gear (15) from the carrier.
d. Remove bearing (16) from the planetary gear.
e. Repeat Steps 13.b through 13.d for the other two planetary gears.
f. Use a screwdriver in order to remove retaining ring (17) from the carrier. Remove sun
gear (18) from the carrier.
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14. Attach Tooling (D) and a suitable lifting device to carrier assembly (19) , as shown.
Remove carrier assembly (19) by pulling the carrier assembly straight up. The weight of
carrier assembly (19) is approximately 45 kg (100 lb).
15. Disassemble carrier assembly (19) , as follows:
Note: Spacer (20) may remain with carrier assembly (19) , or the spacer may remain with
carrier assembly (28) . Refer to Step 17.
a. Remove spacer (20) from carrier assembly (19) .
6/13
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Caterpillar Cat 345D L Excavator (Prefix MLK) Service Repair Manual Instant Download.pdf

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