Caterpillar Cat 349D2 L Excavator (Prefix XAC) Service Repair Manual (XAC00001 and up).pdf

Service Repair Manual
Models
349D2 L Excavator

Shutdown SIS
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Product: EXCAVATOR
Model: 349D2 L EXCAVATOR XAC
Configuration: 349D2 L Excavators XAC00001-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
i02407350
Travel Motor - Disassemble
SMCS - 4351-015
Disassembly Procedure
Start By:
a. Remove the travel motor. Refer to Disassembly and Assembly, "Travel Motor - Remove" .
Table 1
Required Tools
Tool Part Number Part Description Qty
A 3E-3879 Eyebolt 1
B 1P-0074 Slide Hammer Puller 1
C 6V-3010 Puller Group 1
D 4C-8359 Eyebolt 1
E 9S-9152 Bearing Puller 1
F 1P-1862 Pliers 1
G 1P-0510 Driver Group 1
H 1U-7600 Slide Hammer Puller 1
NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting, and repair
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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, "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.
NOTICE
Failure to properly assemble parts or failure to follow established
procedures can lead to damage to the parts and assembly.
To avoid damage to parts, always identify and mark the parts so that
they can be installed into the same location. Never force parts during
assembly. Keep parts clean and lubricated.
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.
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.
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2020/9/12

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1. Thoroughly clean the outside of the travel motor prior to disassembly. Fasten the travel
motor to a suitable holding fixture in a vertical position. The weight of the travel motor is
141 kg (310 lb).
Illustration 1 g00627438
2. Remove displacement change valve (1) from the head of the travel motor.
3. Remove O-ring seals (2) and rings (3) from the displacement change valve.
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Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
4. Remove plugs (5) from the head. Remove an O-ring seal from each plug.
5. Remove outer bolts (4) from the head of the travel motor.
6. Use Tooling (A) and a suitable lifting device to remove the head of the travel motor from
the travel motor housing. The weight of head (6) is approximately 43 kg (95 lb).
Note: There are pins (7) that may fall out of the inside of the head when the head is
removed.
Note: Be careful during the removal of head (6) from the travel motor housing. Be careful
not to scratch mating surfaces or damage the mating surfaces of the components.
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7. Turn over the head. If pins (7) are in the bottom side of the head, remove the pins.
8. Remove port plate (8) and O-ring seal (9) from the head.
9. Use Tooling (B) in order to remove bearing (10) from the head of the travel motor.
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10. Remove plate (11) and remove springs (12) from the travel motor housing.
11. Remove O-ring seals (13) from the upper surface of the travel motor housing.
12. Install Tooling (C) on the brake piston (14). Remove the brake piston.
13. Remove O-ring seals (15) and the backup rings from the brake piston.
Note: Make sure that you take note of the location of the O-rings versus the backup rings.
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14. Remove separator plates (16) from the travel motor housing.
15. Remove disks (17) from the travel motor housing.
16. Install Tooling (D) to the shaft and use a suitable lifting device in order to remove the
rotating group from the travel motor housing. The weight of the rotating group is 29 kg
(65 lb).
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Note: Do not allow the components of the rotating group to come apart during the removal
from the travel motor. All of the components in the rotating group must be reinstalled in the
component's original location.
17. Turn over the rotating group. Remove shaft assembly (18) from the rotating group.
18. Use a suitable press to remove bearing (19) from shaft assembly (18).
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19. Use Tooling (E) and a suitable press in order to remove inner race (20) from shaft assembly
(18).
20. Remove cam plate (21) from the rotating group.
21. Retainer (22) and piston assemblies (23) are nonserviceable separately. Prior to the removal
of the retainer and the piston assemblies from barrel (24), put identification marks on the
piston assemblies, the retainer and the barrel for assembly purposes.
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22. The piston assemblies must be reinstalled in the original bores in the retainer and the barrel.
23. Remove retainer (22) and piston assemblies (23) from barrel (24).
24. Separate the piston assemblies from the retainer.
Note: The orientation of the washers (25) is important. The washers must be reinstalled on
barrel (24) in the same orientation.
25. Remove guide (26) and outer spacer (27) from barrel (24).
26. Remove washers (25) and inner spacer (28) from the barrel.
27. Remove keys (29) from the travel motor housing.
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349D2 L Excavators XAC00001-UP (MACHINE) POWERED BY C13 Engine(SE...
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28. Use Tooling (F) to remove retaining ring (30) from the shaft end of the travel motor
housing.
29. Use Tooling (G) to remove lip seal (31) from the travel motor housing if the shaft has been
removed from the travel motor.
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30. Use Tooling (H) to remove lip seal (31) if the shaft has not been removed from the travel
motor. Place the travel motor in a vertical position when you use Tooling (H) to remove the
lip type seal.
31. Remove plug (33) and piston (32) from the travel motor housing. Remove O-ring seal (34)
from the plug.
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
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12/12
2020/9/12

Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 349D2 L EXCAVATOR XAC
Configuration: 349D2 L Excavators XAC00001-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.
1/13
2020/9/12

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.
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.
9/13
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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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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).
12/13
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Caterpillar Cat 349D2 L Excavator (Prefix XAC) Service Repair Manual (XAC00001 and up).pdf

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