1) The document provides disassembly and assembly instructions for a final drive on an excavator.
2) It describes 32 steps to disassemble the final drive by removing components like housing covers, gears, shafts, and seals.
3) It describes 28 steps to reassemble the final drive by cleaning parts and reinstalling components like seals, bearings, gears, and housing pieces in the reverse order of disassembly. Proper cleaning, lubrication, and torque specifications are emphasized.
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𝘼𝙣𝙩𝙞𝙦𝙪𝙚 𝙋𝙡𝙖𝙨𝙩𝙞𝙘 𝙏𝙧𝙖𝙙𝙚𝙧𝙨 𝙞𝙨 𝙫𝙚𝙧𝙮 𝙛𝙖𝙢𝙤𝙪𝙨 𝙛𝙤𝙧 𝙢𝙖𝙣𝙪𝙛𝙖𝙘𝙩𝙪𝙧𝙞𝙣𝙜 𝙩𝙝𝙚𝙞𝙧 𝙥𝙧𝙤𝙙𝙪𝙘𝙩𝙨. 𝙒𝙚 𝙝𝙖𝙫𝙚 𝙖𝙡𝙡 𝙩𝙝𝙚 𝙥𝙡𝙖𝙨𝙩𝙞𝙘 𝙜𝙧𝙖𝙣𝙪𝙡𝙚𝙨 𝙪𝙨𝙚𝙙 𝙞𝙣 𝙖𝙪𝙩𝙤𝙢𝙤𝙩𝙞𝙫𝙚 𝙖𝙣𝙙 𝙖𝙪𝙩𝙤 𝙥𝙖𝙧𝙩𝙨 𝙖𝙣𝙙 𝙖𝙡𝙡 𝙩𝙝𝙚 𝙛𝙖𝙢𝙤𝙪𝙨 𝙘𝙤𝙢𝙥𝙖𝙣𝙞𝙚𝙨 𝙗𝙪𝙮 𝙩𝙝𝙚 𝙜𝙧𝙖𝙣𝙪𝙡𝙚𝙨 𝙛𝙧𝙤𝙢 𝙪𝙨.
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2. Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 385C EXCAVATOR KKK
Configuration: 385C & 385C L Excavator KKK00001-UP (MACHINE) POWERED BY C18 Engine
Disassembly and Assembly
385C Excavator and 385C MHPU Mobile Hydraulic Power Unit Machine Systems
Media Number -RENR8620-05 Publication Date -01/02/2012 Date Updated -20/02/2012
i02565371
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 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 Hex Bit Socket 1
E 176-6536 Forcing Bolt 2
Start By:
A. Remove the final drive. Refer to Disassembly and Assembly, "Final Drive - Remove".
Note: Cleanliness is an important factor. Before you begin the disassembly procedure, the exterior
of the components should be thoroughly cleaned. This will help to prevent dirt from entering the
internal mechanism. Precision components can be damaged by contaminants or by dirt. Perform
disassembly procedures on a clean work surface. Keep components covered and protected at all
times.
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3. Illustration 1 g01284546
1. Fasten final drive (1) to Tooling (A). Put an alignment mark across the sections of final
drive (1) for assembly purposes. All parts must be reinstalled in the original locations. The
weight of final drive (1) is approximately 1020 kg (2250 lb).
Illustration 2 g01284563
2. Remove socket setscrews (2) from housing cover (3) .
Illustration 3 g01284577
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4. 3. Fasten Tooling (B) and a suitable lifting device to housing cover (3) .
4. Remove bolts (4) and the washers. Use a soft faced hammer in order to break the seal
between housing cover (3) and the ring gear. Remove housing cover (3). The weight of
housing cover (3) is approximately 95 kg (210 lb).
Illustration 4 g01284579
5. Remove spacer (5) and the shims from housing cover (3) .
6. Remove socket head bolts (6) and ring gear (7) from housing cover (3) .
Illustration 5 g01284589
7. Remove sun gear (8) .
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5. Illustration 6 g01284593
8. Use Tooling (B) and a suitable lifting device in order to remove carrier assembly (9). The
weight of carrier assembly (9) is approximately 43 kg (95 lb).
Illustration 7 g01284596
9. Remove retaining ring (10), spacer (11), and sun gear (12) .
Illustration 8 g01284599
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7. 10. Drive spring pin (14) into planetary shaft (15). Remove planetary shaft (15) and planetary
gear assembly (13) .
Illustration 9 g01284603
11. Remove washers (16) and bearing (17) from planetary gear (18). Remove spring pin (14)
from planetary shaft (15) .
12. Repeat Steps 10 and 11 for the remaining planetary gear assemblies.
Illustration 10 g01284605
13. Use Tooling (B) and a suitable lifting device in order to remove carrier assembly (19). The
weight of carrier assembly (19) is approximately 95 kg (210 lb).
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8. Illustration 11 g01284609
14. Remove retaining ring (20), spacer (21), and sun gear assembly (22) .
Illustration 12 g01284612
15. Drive spring pin (23) into planetary shaft (25). Remove planetary shaft (25) and planetary
gear assembly (24) .
Illustration 13 g01284616
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9. 16. Remove washers (28) and bearing (27) from planetary gear (26). Remove spring pin (23)
from planetary shaft (25) .
17. Repeat Steps 15 and 16 for the remaining planetary gear assemblies.
Illustration 14 g01284622
18. Remove spacer (30). Use Tooling (B) and a suitable lifting device in order to remove carrier
assembly (29). The weight of carrier assembly (29) is approximately 132 kg (290 lb).
Illustration 15 g01284632
19. Drive spring pin (32) into planetary shaft (33). Remove planetary shaft (33) and planetary
gear assembly (31) .
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10. Illustration 16 g01284637
20. Remove washers (34) and (38), and bearings (35) and (37) from planetary gear (36).
Remove spring pin (32) from planetary shaft (33) .
21. Repeat Steps 19 and 20 for the remaining planetary gear assemblies.
Illustration 17 g01284647
22. Use Tooling (B) and a suitable lifting device in order to remove ring gear (39) from housing
(40). The weight of ring gear (39) is approximately 155 kg (340 lb).
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11. Illustration 18 g01284657
23. Remove O-ring seal (41) from housing (40) .
Illustration 19 g01284704
24. Place suitable cribbing under motor housing (42) in order to support motor housing (42) .
Illustration 20 g01284709
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12. Illustration 21 g00865969
25. Use Tooling (D) in order to remove bolts (43) from coupling gear (44) .
Note: A part of Tooling (D) must be modified. Cut Length (X) on the Hex Bit Socket to a
length of 14.0 mm (0.55 inch).
Illustration 22 g01284713
26. Install Tooling (E) in coupling gear (44), as shown. Tighten Tooling (E) evenly in order to
loosen coupling gear (44). Remove coupling gear (44) from motor housing (42) .
Illustration 23 g01284718
27. Remove shims (45) from motor housing (42) .
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13. Illustration 24 g01284723
28. Remove bolts (46). Use Tooling (C) and a suitable lifting device in order to separate
housing (40) from motor housing (42). Motor housing (42) will rest on the suitable cribbing.
The weight of housing (40) is approximately 250 kg (550 lb).
Illustration 25 g01284734
29. Remove bearing cone (47) from housing (40) .
Illustration 26 g01284738
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14. 30. Use Tooling (C) and a suitable lifting device in order to flip housing (40) on the other side.
The weight of housing (40) is approximately 250 kg (550 lb).
31. Remove Duo-Cone seal (48), and bearing cups (49) and (50) from housing (40) .
Illustration 27 g01284743
32. Remove pins (51) from motor housing (42), if necessary.
33. Remove bearing cone (52) from motor housing (42) .
34. Remove Duo-Cone seal (53) from motor housing (42) .
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sun Oct 11 11:31:48 UTC+0800 2020
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15. Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 385C EXCAVATOR KKK
Configuration: 385C & 385C L Excavator KKK00001-UP (MACHINE) POWERED BY C18 Engine
Disassembly and Assembly
385C Excavator and 385C MHPU Mobile Hydraulic Power Unit Machine Systems
Media Number -RENR8620-05 Publication Date -01/02/2012 Date Updated -20/02/2012
i04956682
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 138-7575 Link Bracket 3
C 138-7576 Link Bracket 2
F 205-8241 Installer 1
G 6V-3175 Double Acting Cylinder 1
3S-6224 Electric Hydraulic Pump Gp 1
1U-9889 Crossblock 1
9S-7338 Crossblock 1
150-1961 Washer 2
150-1786 Plate 2
4C-9634 Puller Stud 1
9U-6832 Nut 1
2K-7468 Locknut 1
4K-0684 Locknut 2
6V-2078 Stud 2
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16. 5P-4807 Cap 2
H 5P-3931 Anti-Seize Compound 1
J 9S-3263 Thread Lock Compound 1
K 1U-8846 Gasket Sealant 1
L 200-5937 Lubricant 1
M FT-2770 Leak Testing Tool 1
Note: Cleanliness is an important factor. Before assembly, thoroughly clean all parts in cleaning
fluid. Allow the parts to air dry. Do not use wiping cloths or rags to dry parts. Lint may be
deposited on the parts which may cause trouble. Inspect all parts. If any parts are worn or
damaged, use new parts for replacement. Dirt and other contaminants can damage the precision
component. Perform assembly procedures on a clean work surface. Keep components covered and
protected at all times.
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.
1. Reassemble the final drive on Tooling (A) and suitable cribbing.
Illustration 1 g01284743
Note: Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install".
Note: The rubber portion of Duo-Cone seal (53) and all surfaces that contact Duo-Cone seal
(53) must be clean and dry. After installation of Duo-Cone seal (53) , apply Tooling (L) on
the contact surfaces of the metal portion of Duo-Cone seal (53) .
2. Use Tooling (F) in order to install Duo-Cone seal (53) .
3. Apply Tooling (H) to the surfaces on motor housing (42) that will contact bearing cone
(52) .
4. Raise the temperature of bearing cone (52) . Use a suitable press in order to install bearing
cone (52) in motor housing (42) .
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17. 5. Apply Tooling (H) to the surfaces that contact pins (51) . Install pins (51) .
Illustration 2 g01284738
6. Apply Tooling (H) to the surfaces that contact bearing cups (49) and (50) on housing (40) .
Install bearing cups (49) and (50) in housing (40) .
Note: Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install".
Note: The rubber portion of Duo-Cone seal (53) and all surfaces that contact Duo-Cone seal
(48) must be clean and dry. After installation of Duo-Cone seal (48) , apply Tooling (L) on
the contact surfaces of the metal portion of Duo-Cone seal (48) .
Note: Make sure that the Duo-Cone seals (53) and (48) are not scratched or damaged during
the assembly of housing (40) or during the assembly of motor housing (42) . After
installation of housing (40) on the motor housing (42) , 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.
7. Use Tooling (F) in order to install Duo-Cone seal (48) .
Illustration 3 g01285518
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18. 8. Attach Tooling (C) and a suitable lifting device to housing (40) in order to flip housing (40)
on the other side.
9. Use Tooling (C) and a suitable lifting device in order to install housing (40) on motor
housing (42) . The weight of the housing (40) is approximately 250 kg (550 lb).
Illustration 4 g01285527
10. Install bearing cone (47) .
11. Use the following procedure to determine the bearing preload and the correct number of
shims.
Illustration 5 g01285536
a. Use a depth micrometer in order to measure the step length of coupling gear (44) .
Take measurements at several different locations around gear (44) . Compute the
average of the measured dimensions and record the number. Call this Dimension (X) .
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19. Illustration 6 g01285550
Illustration 7 g01285553
b. Use Tooling (G) in order to apply a load of 10700 kPa (1550 psi) to bearing cone (47)
(not shown) and to bearing cone (52) (not shown). The load will seat bearing cone
(47) (not shown) and bearing cone (52) (not shown). A pressure of 10700 kPa (1550
psi) on the electric hydraulic pump of Tooling (G) will result in a pressure of 10000
kg (22050 lb) on bearing cone (47) (not shown) and on bearing cone (52) (not
shown). Rotate the housing in order to seat bearing cone (47) (not shown) and bearing
cone (52) (not shown). Reduce the load on the electric hydraulic pump of Tooling (G)
to 4825 kPa (700 psi).
c. Rotate Tooling (G) by 90° and repeat Step 11.b.
d. Maintain the load on bearing cone (47) (not shown) and on bearing cone (52) (not
shown). Use a depth micrometer and measure the distance between the top face of
housing (42) and bearing cone (47) . Take this measurement in several locations
around bearing cone (47) . 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
bearing cone (47) and coupling gear (44) . The shim pack thickness is equal to
Dimension (Y) minus Dimension (X) . Tolerance for the shim pack is 0.10 mm (0.003
inch).
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20. Illustration 8 g01284718
Illustration 9 g01284709
Note: If two shims are required, install the thinner shim next to coupling gear (44) when
coupling gear (44) is installed.
12. Place shims (45) in the correct position on motor housing (42) . If two shims were required,
put the thinner shim in contact with coupling gear (44) . Make sure that all of the holes in
the components are in alignment with each other. Put coupling gear (44) in the original
position on the motor housing.
13. ApplyTooling (J) on the threads of bolts (43) . Install bolts (43) in order to secure coupling
gear (44) in place. Tighten bolts (43) evenly and tighten bolts (43) in diagonally opposite
pairs. Tighten bolts (43) to a torque of 900 ± 100 N·m (665 ± 75 lb ft).
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21. Illustration 10 g01284657
14. Install O-ring seal (41) in main housing (40) .
Illustration 11 g01285592
15. Use Tooling (C) and a suitable lifting device in order to position housing (40) and motor
housing (42) on Tooling (A) . Remove the suitable cribbing. The weight of both housings is
approximately 430 kg (950 lb).
Illustration 12 g01284647
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22. 16. Thoroughly clean the mating surface of housing (40) that contacts ring gear (39) . Apply a
bead of Tooling (K) on the mating surface of ring gear (39) . Use Tooling (B) and a suitable
lifting device in order to position ring gear (39) on housing (40) . Make sure that the
alignment mark on housing (40) and ring gear (39) line up with each other. It may be
necessary to use a soft faced hammer to seat ring gear (39) on housing (40) .
17. Assemble planetary gear assembly (31) , as follows:
Illustration 13 g01284637
Illustration 14 g01284632
a. Apply clean SAE 30 oil on bearings (35) and (37) . Install bearings (35) and (37) in
planetary gear (36) .
b. Install washers (34) and (38) on each side of planetary gear (36) .
c. Install planetary gear assembly (31) and washers (34) and (38) in carrier assembly
(29) .
d. Install planetary shaft (33) in carrier assembly (29) and through planetary gear
assembly (31) . Make sure that the spring pin hole in planetary shaft (33) is in
alignment with the spring pin hole in the carrier.
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23. Illustration 15 g03142259
e. Install spring pin (32) in the carrier 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 the
carrier.
f. Orient the split in spring pin (32) as shown. Make a stake mark on each side of the
spring pin hole in the carrier. This will prevent spring pin (32) from falling out of the
spring pin hole. Each stake mark should be approximately to 2.25 ± 0.75 mm (0.089 ±
0.030 inch) from the outside diameter of the spring pin hole.
g. Repeat Steps 17.a through 17.f in order to install the other three planetary gear
assemblies in carrier assembly (29) .
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24. Illustration 16 g01285680
18. Fasten Tooling (B) and a suitable lifting device to carrier assembly (29) . Put carrier
assembly (29) in position in ring gear (39) . It may be necessary to move carrier assembly
(29) back and forth during installation in order to ensure that all gears engage properly.
19. Install spacer (30) .
20. Assemble planetary gear assembly (24) , as follows:
Illustration 17 g01284616
a. Apply clean SAE 30 oil on bearing (27) . Install bearing (27) in planetary gear (26) .
b. Install washers (28) on each side of planetary gear assembly (24) .
c. Install washers (28) and planetary gear assembly (24) in carrier assembly (19) .
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25. Illustration 18 g01284612
d. Install planetary shaft (25) in carrier assembly (19) and through planetary gear
assembly (24) . Make sure that the spring pin hole in planetary shaft (25) is in
alignment with the spring pin hole in the carrier.
Illustration 19 g03142259
e. Orient the split in spring pin (23) as shown. Make a stake mark on each side of the
spring pin hole in the carrier. This will prevent spring pin (23) from falling out of the
spring pin hole. Each stake mark should be approximately to 2.25 ± 0.75 mm (0.089 ±
0.030 inch) from the outside diameter of the spring pin hole.
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26. f. Repeat Steps 20.a through 20.e in order to install the other two planetary gear
assemblies in carrier assembly (19) .
Illustration 20 g01284609
21. Install sun gear assembly (22) , spacer (21) , and retaining ring (20) .
Illustration 21 g01284605
22. Use Tooling (B) and a suitable lifting device in order to install carrier assembly (19) . The
weight of carrier assembly (19) is approximately 95 kg (210 lb).
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27. Illustration 22 g01284603
23. Apply clean SAE 30 oil on bearing (17) . Install washers (16) and bearing (17) in planetary
gear (18) .
Illustration 23 g01284599
24. Install planetary gear assembly (13) , planetary shaft (15) , and drive spring pin (14) into
planetary shaft (15) .
25. Repeat Steps 23 and 24 for the remaining planetary gear assemblies.
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28. Thank you very much for
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29. Illustration 24 g01284596
26. Install sun gear (12) , spacer (11) , and retaining ring (10) .
Illustration 25 g01284593
27. Use Tooling (B) and a suitable lifting device in order to install carrier assembly (9) . The
weight of carrier assembly (9) is approximately 43 kg (95 lb).
Illustration 26 g01284589
28. Install sun gear (8) .
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30. Illustration 27 g01284579
29. Install the shims and spacer (5) in housing cover (3) .
30. Install ring gear (7) and socket head bolts (6) in housing cover (3) .
Illustration 28 g01284577
31. Use Tooling (B) and a suitable lifting device in order to position housing cover (3) . Install
bolts (4) and the washers. The weight of housing cover (3) is approximately 95 kg (210 lb).
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31. Illustration 29 g01284563
32. Remove Tooling (B) and install socket setscrews (2) in housing cover (3) .
Illustration 30 g01286860
33. Remove plug (54) . Attach Tooling (M) in order to perform a pressure test on the final
drive.
Note: The final drive must sustain 98 kPa (14 psi) air pressure without a drop in pressure
for 30 seconds. A pressure over 98 kPa (14 psi) must be avoided.
34. Install plug (54) . Tighten plug (54) to a torque of 80 ± 10 N·m (59 ± 7 lb ft).
Illustration 31 g01284546
35. Remove final drive (1) from Tooling (A) . The weight of final drive (1) is approximately
1020 kg (2250 lb).
End By: Install the final drive. Refer to Disassembly and Assembly, "Final Drive - Install".
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Sun Oct 11 11:32:45 UTC+0800 2020
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