Caterpillar Cat 374F L Excavator (Prefix NFJ) Service Repair Manual Instant Download.pdf

Service Repair Manual
Models
374F L Excavator

Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 374F L EXCAVATOR NFJ
Configuration: 374F L Excavator NFJ00001-UP (MACHINE) POWERED BY C15 Engine
Disassembly and Assembly
374F Excavator Machine Systems
Media Number -UENR0163-04 Publication Date -01/10/2017 Date Updated -31/10/2017
i05793237
Final Drive - Disassemble
SMCS - 4050-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-2420 Transmission Repair Stand 1
B 439-3940 Link Bracket 3
C 439-3941 Link Bracket 2
D
385-7874 Hydraulic Wrench 1
385-8479 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.
1. Thoroughly clean the outside of the final drive prior to disassembly.
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Illustration 1 g00865168
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) .
Typical example
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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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.
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Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 374F L EXCAVATOR NFJ
Configuration: 374F L Excavator NFJ00001-UP (MACHINE) POWERED BY C15 Engine
Disassembly and Assembly
374F Excavator Machine Systems
Media Number -UENR0163-04 Publication Date -01/10/2017 Date Updated -31/10/2017
i05793279
Final Drive - Assemble
SMCS - 4050-016
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-2420 Transmission Repair Stand 1
B 439-3941 Link Bracket 3
C 439-3940 Link Bracket 2
D
385-7874 Hydraulic Torque Wrench 1
385-8479 Hydraulic Pump and Motor Gp 1
9U-7418 Hex Bit Socket 1
F 6V-3175 Double Acting Cylinder 1
350-7768 Electric Hydraulic Pump Gp 1
150-1784 Crossblock 1
1U-9889 Crossblock 1
*150-1961* Washer 2
150-1786 Plate 2
4C-9634 Puller Stud 1
9U-6832 Nut 1
2K-7468 Locknut 1
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4K-0684 Locknut 2
6V-2078 Stud 2
5P-4807 Cap 2
G 439-3940 Link Bracket 2
H 205-8241 Seal Installer 1
J 5P-3931 Anti-Seize Compound 1
K 9S-3263 Thread Lock Compound 1
L - Loctite High Flex Form-In-Place Gasket -
When you are using hydraulic cylinders and puller studs, always ensure
that the rated capacity of the puller stud meets or exceeds the rated
capacity of the hydraulic cylinder. If the puller stud does not meet or
exceed the rated capacity of the hydraulic cylinder, a sudden failure of
the puller stud could occur. The sudden failure of the puller stud could
result in personal injury or death.
1. Make sure that all parts of the final drive are thoroughly clean and free of dirt and debris
prior to assembly.
Note: Check the condition of all the O-ring seals that are used in the final drive. If any of
the seals are worn or damaged, use new parts for replacement.
2. Reassemble the final drive on wood blocks and Tooling (A) .
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3. Apply Tooling (J) to the surfaces that contact the bearing cones. Install the bearing cone
with a press. Raise the temperature of bearing cone (51) and install the bearing cone.
4. Apply Tooling (J) to the surfaces that contact pins (50) and install contact pins (50) .
5. Apply Tooling (J) to the surfaces that contact the bearing cups. Install bearing cups (48) and
(49) .
6. Attach Tooling (C) and a suitable lifting device to main housing (45). Install main housing
(45) on motor housing (39). The weight of main housing (45) is approximately 191 kg (420
lb).
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7. Install bearing cone (46) and the bearing cone.
8. Use the following procedure in order to determine the bearing preload and the correct
number of shims.
a. Use a depth micrometer in order to measure the step length of the coupling gear (42).
Take measurements at several different locations around the gear. Compute the
average of the measured dimensions and record the number. Call this Dimension (X) .
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b. Use Tooling (F) to apply a load of 10700 kPa (1550 psi) in order to seat the bearings.
A pressure of 10700 kPa (1550 psi) is the equivalent of 10000 kg (22050 lb) on a
suitable press. Rotate the housing in order to seat the bearing. Reduce the load to
4825 kPa (700 psi).
c. Rotate Tooling (F) by 90° and repeat Step 8.b.
d. Maintain the load on the bearings. Use a depth micrometer and measure the distance
between the top face of motor housing and the bearing cone. Take this measurement
in several locations around the bearing. Compute the average of the measured
dimensions and record the number. Call this Dimension (Y) .
e. Determine the correct thickness of the shim pack that will be installed between the
bearing cone and the coupling gear. The shim pack thickness is equal to Dimension
(X) minus Dimension (Y). Tolerance for the shim pack is 0.10 mm (0.003 inch).
Note: If two shims are required, install the thinner shim next to the coupling gear
when the coupling gear is installed.
9. Use Tooling (C) and a suitable lifting device to remove the main housing from the motor
housing. The weight of the main housing is approximately 191 kg (420 lb).
Note: Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install".
Note: The rubber seals and all surfaces that contact the seals must be clean and dry. After
installation of the seals, apply clean oil on the contact surfaces of the metal seals.
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10. Use Tooling (H) to install Duo-Cone seal (47) in the main housing.
11. Use Tooling (H) to install Duo-Cone seal (52) in the motor housing.
Note: Make sure that the Duo-Cone seals are not scratched or damaged during the assembly
of the main housing or during the assembly of the motor housing. After installation of the
main housing on the motor housing, there will be a small gap between the components. The
gap is caused by the Duo-Cone seals. The gap will be eliminated during installation of the
gear.
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12. Use Tooling (C) and a suitable lifting device to position main housing (45) on motor
housing (39). Make sure that the Duo-Cone seals are not scratched or damaged during
installation. The weight of the main housing is approximately 191 kg (420 lb).
13. Install bearing cone (46) .
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Typical Example
14. Place shims (43) in the correct position on the motor housing. If two shims were required,
put the thinner shim in contact with coupling gear (42). Make sure that all of the holes in the
components are in alignment with each other. Put coupling gear (42) in the original position
on the motor housing.
15. Apply Tooling (K) on the threads of bolts (41). Install the bolts to secure coupling gear (42)
in place. Tighten bolts (41) evenly in a crisscross pattern to a torque of 1800 ± 200 N·m
(1327 ± 148 lb ft).
16. Install O-ring seal (40) in the main housing.
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17. Use Tooling (C) and a suitable lifting device to position housings (39) and (45) on Tooling
(A). The combined weight of housings (39) and (45) is approximately 363 kg (800 lb).
18. Install bolts (44) in order to secure the housings to Tooling (A) .
19. Remove the suitable cribbing.
20. Thoroughly clean the mating surface of main housing (39) that contacts ring gear (38).
Apply a bead of Tooling (L) on the mating surface of ring gear (38). Use Tooling (C) and a
suitable lifting device to place ring gear (38) in position on main housing (39). Make sure
that the alignment mark on main housing (39) and ring gear (38) line up with each other. It
may be necessary to use a suitable hammer to seat ring gear (38) on main housing (39) .
21. Assemble the carrier assembly, as follows:
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a. Apply clean oil on bearings (34) and (36). Install bearings (34) and (36) in planetary
gear (35) .
b. Install thrust washers (33) and (37) on each side of planetary gear (35) .
c. Install planetary gear (35) and thrust washers (33) in carrier assembly (28) .
d. Install planetary shaft (32) in carrier assembly (28) and through planetary gear
assembly (30). Make sure that the spring pin hole in planetary shaft (32) is in
alignment with the spring pin hole in carrier assembly (28) .
e. Install spring pin (31) in carrier assembly (28) and into planetary shaft (32). Make
sure that the spring pin hole in planetary shaft (32) is in alignment with the spring pin
hole in carrier assembly (28) .
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f. Orient the split in spring pin (31) horizontally to the carrier. Align the split in the
spring pin to the left or to the right. Make a stake mark on each side of the spring pin
hole in the carrier. This will prevent the spring pin from falling out of the spring pin
hole. Each stake mark should be approximately 1.5 to 3.00 mm (0.06 to 0.118 inch)
from the outside diameter of the spring pin hole.
g. Repeat Steps 21.a through 21.f in order to install the other three planetary gears in
carrier assembly (28) .
22. Use Tooling (C) and a suitable lifting device to install carrier assembly (28) in the ring gear.
The weight of carrier assembly (28) is approximately 125 kg (275 lb).
23. Install spacer (29) .
24. Assemble the carrier assembly, as follows:
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a. Apply clean oil on bearing (26). Install bearing (26) in planetary gear (25) .
b. Install thrust washers (27) on each side of planetary gear (25) .
c. Install thrust washers (27) and planetary gear (25) in the carrier assembly.
d. Install planetary shaft (24) in the carrier assembly and through planetary gear
assembly (23). Make sure that the spring pin hole in planetary shaft (24) is in
alignment with the spring pin hole in the carrier.
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e. Orient the split in the spring pin (22) horizontally to the carrier. Align the split in the
spring pin to the left or to the right. Make a stake mark on each side of the spring pin
hole in the carrier. This will prevent the spring pin from falling out of the spring pin
hole. Each stake mark should be approximately 1.5 to 3.00 mm (0.06 to 0.118 inch)
from the outside diameter of the spring pin hole.
f. Repeat Steps 24.a through 24.e in order to install the other two planetary gears in the
carrier assembly.
25. Install gear assembly (21), spacer (20), and retaining ring (19) .
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26. Use Tooling (B) and a suitable lifting device to install carrier assembly (18). The weight of
27. Apply clean oil on bearing (16). Install washers (15) and bearing (16) in gear (17) .
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