Caterpillar cat 374 d l excavator (prefix pax) service repair manual (pax00001 and up)

Service Repair Manual
Models
374D L Excavator

Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 374D L EXCAVATOR PAX
Configuration: 374D L Excavator PAX00001-UP (MACHINE) POWERED BY C15 Engine
Disassembly and Assembly
374D Excavator Machine Systems
Media Number -KENR6406-01 Publication Date -01/02/2012 Date Updated -23/02/2012
i03768729
Travel Motor - Assemble
SMCS - 4351-016
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 138-7573 Link Bracket 1
B 1P-1861 Retaining Ring Pliers As 1
C 6V-2055 Grease 1
D 128-5049 Guide Stud 2
Illustration 1 g02002733
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https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

1. Lubricate actuator piston (43) with hydraulic oil. Install actuator piston (43) into housing
(2). Install plug (42). Tighten plug (42) to a torque of 430 ± 40 N·m (315 ± 30 lb ft).
2. Install shaft seal (41). Use Tooling (B) in order to install retaining ring (44) .
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3. Use a suitable press to install bearing (39) onto shaft assembly (29). Bearing (39) must be
installed with retaining clip (X) toward the barrel assembly.
4. Install shaft assembly (29). Install the key and pin assemblies (38) .
5. Install swashplate (37) into motor housing (2) .
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6. Install barrel spacer (36), washers (35), thick spacer (34), thin spacer (33), and bearing 32
onto barrel assembly (27) .
7. Install piston assemblies (31), and plate (30) onto barrel assembly (27) .
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8. Wrap a piece of nylon string around the pistons (31), as shown. Install barrel assembly (27)
into the pump housing. Use the nylon string in order to hold the assembly together during
installation. Remove the nylon string.
9. Install the brake discs (28). Start with brake disc (Y). Alternate between brake discs (Y) and
brake discs (Z) with brake discs (Y) on the top and the bottom.
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10. Install O-ring seal (26) and backup ring (27) onto the brake piston (22). Install O-ring seal
(25) and backup ring (24) onto the brake piston (22).
11. Install O-ring seals (23) onto motor housing (2). Install springs (21) onto brake piston (22) .
12. Install balls (20), O-ring seals (19), backup rings (18), and retainers (17) into head (3) .
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Improper assembly of parts that are spring loaded can cause bodily
injury.
To prevent possible injury, follow the established assembly procedure
and wear protective equipment.
13. Install spring (13), spool (14), and adapter (15). Tighten adapter (15) to a torque of 115 ± 10
N·m (85 ± 7 lb ft). Install elbow (16) .
14. Install ball (9), spring (10), and orifice (11). Tighten orifice (11) to a torque of 7 ± 1 N·m
(62 ± 9 lb in). Install bearing (8). Install adapter (7) and elbow (6) .
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15. Apply Tooling (C) to the back side of plate (5) in order to hold plate (5) in place during
assembly. Install plate (5) to head (3) .
Improper assembly of parts that are spring loaded can cause bodily
injury.
To prevent possible injury, follow the established assembly procedure
and wear protective equipment.
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16. Install Tooling (D) to housing (2). Install head (3) onto motor housing (2). Use a suitable
lifting device to install head (3). The weight of the head (3) is approximately 40 kg (90 lb).
Remove Tooling (A) and Tooling (D). Install bolts (4). Tighten bolts (4) to a torque of 530
± 70 N·m (390 ± 50 lb ft).
17. Install O-ring seal (1) onto motor housing (2) .
End By: Install the travel motor. Refer to Disassembly and Assembly, "Travel Motor - Remove &
Install".
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Wed Nov 4 00:56:03 UTC+0800 2020
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Shutdown SIS
Previous Screen
Product: EXCAVATOR
i07285033
Final Drive - Remove and Install
SMCS - 4050-010
Removal Procedure
Table 1
Required Tools
A
132-8223 Power Pack 1
132-8119 Hydraulic Torque Wrench Assembly 1
B - Loctite 243 -
Start By:
a. Remove the final drive sprocket.
b. Remove the travel motor.
Note: The final drive sprocket does not need to be removed prior to removal of the final drive.
The sprocket should be removed to disassemble the final drive.
Note: The travel motor does not need to be removed prior to removal of the final drive. The travel
motor should be removed to disassemble the final drive.
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
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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.
1. Attach a suitable lifting device to final drive (1). The weight of final drive (1) is
approximately 817 kg (1800 lb).
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Note: Mark the location of mounting bolt holes (Z) for the travel motor for installation
purposes.
2. Use Tooling (A) to remove bolts (2). Use the suitable lifting device to remove the final
drive.
Installation Procedure
1. Install final drive (1) in the reverse order of removal.
a. Apply Tooling (B) to bolts (2).
b. Tighten bolts (2) to a torque of 500 ± 50 N·m (369 ± 37 lb ft). Turn bolts (2) an
additional 50° ± 5°.
Wed Nov 4 00:56:59 UTC+0800 2020
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Shutdown SIS
Previous Screen
Product: EXCAVATOR
i02388153
Final Drive - Disassemble
SMCS - 4050-015
Disassembly Procedure
Table 1
Required Tools
A 1P-2420 Transmission Repair Stand 1
B 138-7575 Link Bracket 3
C 138-7576 Link Bracket 2
D
132-8119 Hydraulic Wrench 1
132-8223 Hydraulic Pump and Motor Gp 1
9U-7418 (1)
Hex Bit Socket 1
E 176-6536 Forcing Bolt 2
( 1 )
Cut the tool to length (X). Length (X) is equal to 14 mm (0.55 inch). Refer to Step 27 for the correct
modification.
Start By:
A. Remove the final drive. Refer to Disassembly and Assembly, "Final Drive - Remove".
1. Thoroughly clean the outside of the final drive prior to disassembly.
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2. Fasten 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. The
weight of the final drive is approximately 817 kg (1800 lb).
3. Remove socket head bolts (1) from the final drive cover.
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4. Attach Tooling (C) and a suitable lifting device to cover (2). The weight of cover (2) is
approximately 66 kg (145 lb).
5. Remove bolts (3). Use a suitable hammer to break the seal between cover (2) and the ring
gear. Remove cover (2).
6. Remove spacer (4) and the shims from the cover.
7. Remove socket head bolts (5) and ring gear (6) from the cover.
8. Remove sun gear (7) .
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9. Use Tooling (B) and a suitable lifting device to remove carrier assembly (8). The weight of
carrier assembly (8) is approximately 30 kg (55 lb).
10. Remove retaining ring (9), spacer (10), and sun gear (11) .
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11. Drive spring pin (13) into shaft (14). Remove shaft (14) and gear assembly (12) .
12. Remove washers (15) and bearing (16) from gear (17). Remove spring pin (13) from shaft
(14) .
13. Repeat Steps 11 and 12 for the remaining gear assemblies.
14. Use Tooling (B) and a suitable lifting device to remove carrier assembly (18). The weight of
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15. Remove retaining ring (19), spacer (20), and gear assembly (21) .
16. Drive spring pin (22) into planetary shaft (24). Remove planetary shaft (24) and gear
assembly (23) .
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17. Remove thrust washers (27) and bearing (26) from planetary gear (25). Remove spring pin
(22) from shaft (24) .
19. Use Tooling (C) and a suitable lifting device to remove carrier assembly (28). The weight of
20. Remove spacer (29) .
21. Drive spring pin (31) into shaft (32). Remove planetary shaft (32) and gear assembly (30) .
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22. Remove thrust washers (33) and (37), and bearings (34) and (36) from planetary gear (35).
Remove spring pin (31) from shaft (32) .
24. Use Tooling (C) and a suitable lifting device to remove ring gear (38) from housing (39).
The weight of ring gear (38) is approximately 125 kg (275 lb).
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25. Remove O-ring seal (40) from the main housing.
26. Place suitable cribbing under the final drive in order to support the motor housing.
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Dimension (X) is equal to 14.0 mm (0.55 inch).
27. Use Tooling (D) to remove bolts (41) from gear (42) .
28. Install Tooling (E) in the gear, as shown. Tighten Tooling (E) evenly in order to loosen the
gear. Remove the gear from the motor housing.
29. Remove shims (43) from the motor housing.
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374D L Excavator PAX00001-UP (MACHINE) POWERED BY C15 Engine(SEBP...
2020/11/4

30. Attach Tooling (C) and a suitable lifting device to main housing (45). The weight of main
housing (45) is approximately 191 kg (420 lb).
31. Remove bolts (44) .
32. Use the suitable lifting device to separate main housing (45) from motor housing (39) .
Note: Motor housing (39) will rest on the suitable cribbing.
33. Remove bearing cone (46) from the main housing.
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34. Remove Duo-Cone seal (47), and bearing cups (48) and (49) from the main housing.
35. Remove pins (50), if necessary.
36. Remove bearing cone (51) .
37. Remove Duo-Cone seal (52) from the motor housing.
Wed Nov 4 00:57:56 UTC+0800 2020
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Caterpillar cat 374 d l excavator (prefix pax) service repair manual (pax00001 and up)

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