This document provides instructions for disassembling and assembling the final drive of an excavator model 345B. It describes removing components such as the travel motor, final drive, ring gear, and carrier assemblies. Detailed steps are provided to disassemble each assembly into individual parts. The assembly section instructs cleaning and inspecting parts before reassembling components like the sprocket housing, bearing cones, and coupling gear in their proper positions and orientations. Proper tools and safety precautions are noted throughout.
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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.
Over the 10 years, we have gained a strong foothold in the market due to our range's high quality, competitive prices, and time-lined delivery schedules.
2. Illustration 1 g00625301
3. Remove bolts (1) and the washers that hold travel motor (2) to the final drive. Fasten a
suitable lifting device to the travel motor, and carefully remove the travel motor from the
final drive. The weight of the travel motor is approximately 125 kg (275 lb).
Illustration 2 g00625305
4. Remove O-ring seal (3) and coupling (4) from the final drive.
5. Fasten a suitable lifting device to the final drive, and turn the final drive over 180 degrees.
The weight of the final drive is approximately 590 kg (1300 lb).
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3. Illustration 3 g00625310
6. 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.
7. Remove two socket head cap screws (5) from the final drive cover.
Illustration 4 g00625314
8. Attach Tooling (B) and a suitable lifting device to cover (7) , as shown.
9. Remove bolts (6) and the washers that hold the cover in place.
10. Use a soft faced hammer in order to break the seal between cover (7) and the ring gear.
Remove the cover. The weight of cover (7) is approximately 45 kg (100 lb).
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4. Illustration 5 g00625319
11. Remove spacer (8) from the cover.
Illustration 6 g00625320
12. Remove shims (9) from the cover.
13. Remove socket head bolts (10) and ring gear (11) from the cover.
Illustration 7 g00625322
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5. 14. Remove sun gear (12) from carrier assembly (13) . Remove carrier assembly (13) by lifting
the carrier assembly straight up.
15. Disassemble carrier assembly (13) , as follows:
Illustration 8 g00625397
a. Remove spacers (14) . A spacer is located on each side of the sun gear in carrier
assembly (13) .
Note: Planetary gears (17) might be stamped with identification marks "L". Note the
position of the identification marks in relation to the carrier for assembly purposes.
Illustration 9 g00625398
b. Remove retaining ring (15) with Tooling (C) .
c. Remove thrust washers (16) and planetary gear (17) from the carrier.
d. Remove bearing (18) from planetary gear (17) .
e. Repeat Steps 15.b through 15.d for the remaining planetary gears.
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6. Illustration 10 g00625399
f. Use a screwdriver in order to remove retaining ring (19) from the carrier. Remove sun
gear (20) from the carrier.
Illustration 11 g01033059
16. Attach Tooling (D) and a suitable lifting device to carrier assembly (21) . Remove carrier
assembly (21) by pulling the carrier assembly straight up. The weight of carrier assembly
(21) is approximately 41 kg (90 lb).
17. Disassemble carrier assembly (21) , as follows:
Note: Spacer (22) may remain with carrier assembly (21) , or the spacer may remain with
carrier assembly (30) . Refer to Step 18.
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7. Illustration 12 g00625403
a. Remove spacer (22) from carrier assembly (21) .
Illustration 13 g00625406
b. Drive spring pin (23) into planetary shaft (24) with a hammer and a punch.
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8. Illustration 14 g00625408
c. Remove planetary shaft (24) , thrust washers (25) and planetary gear (26) from the
carrier.
Note: Planetary gears (26) might be stamped with identification marks "M". Note the
position of the identification marks in relation to the carrier for assembly purposes.
d. Remove bearing (27) from the planetary gear.
e. Remove spring pin (23) from planetary shaft (24) with a hammer and a punch.
f. Repeat Steps 17.b through 17.e for the remaining planetary gears from the carrier.
Illustration 15 g00625411
g. Use a screwdriver to remove retaining ring (28) . Remove sun gear (29) from the
carrier.
Illustration 16 g00625528
18. If spacer (22) was not removed in Step 17.a, remove the spacer from carrier assembly (30)
at this time.
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9. Illustration 17 g01033066
19. Attach Tooling (E) and a suitable lifting device to carrier assembly (30) . Remove carrier
assembly (30) . The weight of the carrier assembly (30) is approximately 59 kg (130 lb).
20. Disassemble carrier assembly (30) , as follows:
Illustration 18 g00625413
a. Drive spring pin (31) into planetary shaft (32) with a hammer and a punch.
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10. Illustration 19 g00625415
b. Remove planetary shaft (32) , thrust washers (33) and planetary gear (34) from the
carrier.
Note: Planetary gears (34) might be stamped with identification marks "N". Note the
position of the identification marks in relation to the carrier for assembly purposes.
c. Remove bearings (35) from the planetary gear.
d. Drive spring pin (31) out of planetary shaft (32) with a hammer and a punch.
e. Repeat Steps 20.a through 20.d for the remaining planetary gears.
Illustration 20 g01033070
21. Attach Tooling (E) and a suitable lifting device to ring gear (36) , as shown. Remove ring
gear (36) from sprocket housing (37) . The weight of ring gear (36) is approximately 82 kg
(180 lb).
Illustration 21 g00625418
22. Remove O-ring seal (38) from sprocket housing (37) .
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11. Illustration 22 g00625419
23. Remove bolts (39) from coupling gear (40) .
Illustration 23 g00625421
Note: Mark the orientation of coupling gear (40) for assembly purposes.
24. Install suitable forcing bolts (41) in coupling gear (40) , as shown. Tighten the forcing bolts
evenly in order to loosen coupling gear (40) . Remove the coupling gear from the motor
housing.
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12. Illustration 24 g00625423
Illustration 25 g00625424
25. Remove shims (42) from the motor housing.
Note: Inner cones and outer bearing cones (46) are a slip fit on the motor housing. While
you remove sprocket housing (37) from the motor housing, inner bearing cone (46) may
stay with the sprocket housing or the inner bearing cone may stay on the motor housing.
26. Attach Tooling (F) and a suitable lifting device to sprocket housing (37) , as shown.
Separate sprocket housing (37) from the motor housing. The weight of sprocket housing
(37) is approximately 127 kg (280 lb).
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13. Illustration 26 g00625425
27. Remove the locating pins from the motor housing.
28. Remove Duo-cone seal kit (43) from the motor housing.
29. Remove rope seal (44) from the motor housing.
Note: The 138-0961 rope seal (44) has been removed for the following machines: 345B
(2NW123-UP) and 345B L (4SS952-UP9GS239-UP).
30. If inner bearing cone (46) remained on the motor housing, then remove the inner bearing
cone.
Illustration 27 g00625426
31. Remove Duo-cone seal kit (45) from the sprocket housing.
32. If inner bearing cone (46) remained on the sprocket housing, then remove the inner bearing
cone.
33. Remove the bearing cups from the sprocket housing.
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sun Aug 30 19:43:42 UTC+0800 2020
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14. Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 345B EXCAVATOR AYR
Configuration: ISJ HEX COMMONALITY CHART AYR00001-UP (MACHINE)
Disassembly and Assembly
345B, 345B Series II and W345B Series II Excavators Machine Systems
Media Number -SENR1934-11 Publication Date -01/01/2012 Date Updated -12/01/2012
i05970383
Final Drive - Assemble
SMCS - 4050-016
S/N - 2NW1-UP
S/N - 2SW1-UP
S/N - 2ZW1-UP
S/N - 3MW1-UP
S/N - 4SS1-UP
S/N - 5WS1-UP
S/N - 6MW1-UP
S/N - 6XS1-UP
S/N - 7KS1-UP
S/N - 8KW1-UP
S/N - 8RW1-UP
S/N - 9CW1-UP
S/N - 9GS1-UP
S/N - AGS1-UP
S/N - AKJ1-UP
S/N - AKX1-UP
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15. S/N - ALB1-UP
S/N - ALD1-UP
S/N - AMD1-UP
S/N - AMJ1-UP
S/N - AMN1-UP
S/N - APB1-UP
S/N - AYR1-UP
S/N - BFG1-UP
S/N - CCC1-UP
S/N - DCW1-UP
S/N - DET1-UP
S/N - FEE1-UP
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-2420 Transmission Stand Group 1
B 138-7573 Link Bracket 2
C 1P-1860 Retaining Ring Pliers 1
D 138-7575 Link Bracket 3
E 138-7575 Link Bracket 2
F 138-7574 Link Bracket 2
G 8T-0531 Seal Installer 1
H 5P-3931 Anti-Seize Compound 1
J 5P-0960 Grease Cartridge 1
K 9S-3263 Thread Lock Compound 1
L 1U-8846 Gasket Sealant 1
M 1U-9895 Crossblock 1
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16. 1. Make sure that all parts of the final drive are thoroughly clean and free of dirt and debris
prior to assembly. Check the condition of all O-ring seals that are used in the final drive. If
any of the seals are damaged, use new parts for replacement. Reassemble the final drive on
Tooling (A) .
Illustration 1 g00630989
2. Apply Tooling (H) to the surfaces inside the sprocket housing that will make contact with
the two bearing cups. Install a bearing cup that is in each side of the sprocket housing with a
press. Make sure that the bearing cups are properly seated.
3. Apply Tooling (H) to the surfaces inside the motor housing that will make contact with
bearing cones (46) .
4. Install inner bearing cone (46) on the motor housing.
Illustration 2 g00625424
5. Attach Tooling (F) and a suitable lifting device to sprocket housing (37) , as shown. Install
sprocket housing (37) on the motor housing. Carefully install outer bearing cone (46) on the
sprocket housing.
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17. Illustration 3 g00625423
6. Adjust the bearing preload of the final drive. Determine the correct number of shims (42)
that are required for the proper bearing preload, as follows:
Illustration 4 g00630996
a. Use a depth micrometer in order to measure the step height of coupling gear (40) at
several locations around the gear. Find the average for the measured dimensions
around the gear and record the dimension. Call this dimension (X) .
b. Apply a load of 10000 kg (22000 lb) to bearing cones (46) .
c. Rotate sprocket housing (37) several times in order to seat the bearing cones.
d. Reduce the load to 3500 ± 350 kg (7700 ± 770 lb).
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18. Illustration 5 g00631001
Illustration 6 g03742715
e. While the load is still on the bearing cones, measure the distance between the top face
of the motor housing and the top face of bearing cone (46) . Take measurements in
several locations around the motor housing. Find the average of the measured
dimensions, and record the dimensions. Call this dimension (Y) .
f. Determine the correct thickness of shims (42) which are used between bearing cone
(46) and coupling gear (40) . Use the following equation in order to determine the
shim pack thickness.
Shim pack thickness ... (X) − (Y) ± 0.05 mm (0.002 inch)
Note: If two shims (42) are required, install the thinnest shim next to coupling gear
(40) during final assembly.
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19. Illustration 7 g00625424
7. Attach Tooling (F) and a suitable lifting device to sprocket housing (37) , as shown.
Separate the sprocket housing from the motor housing.
ReferenceRefer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install".
Note: The rubber seals and all surfaces that makes contact with the seals must be clean and
dry. After installation of the seals, put clean SAE 30 oil on the contact surfaces of the metal
seals.
Illustration 8 g00631006
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20. Illustration 9 g00625426
8. Install Duo-Cone seal kit (45) in the sprocket housing with Tooling (G) .
Illustration 10 g00631014
Illustration 11 g00625425
9. Install Duo-Cone seal kit (43) in the motor housing with Tooling (G) .
10. Apply Tooling (H) in the bores for the six locating pins that are in the motor housing.
Reinstall the six locating pins in the motor housing.
11. Apply Tooling (J) in the seal groove of the motor housing. Install rope seal (44) in the motor
housing. Make sure that the seal is not twisted.
Note: The 138-0961 Rope Seal (44) has been removed for the following machines: 345B
(2NW123-UP) and 345B L (4SS952-UP9GS239-UP).
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21. Illustration 12 g00625424
12. Make sure that inner bearing cone (46) is seated properly on the motor housing.
Note: Do not scratch the Duo-Cone seal kit or damage the Duo-Cone seal kit in the main
housing, or the motor housing during assembly of the two components. After installation of
the main housing on the motor housing, there will be a small gap between the components.
The gap between the components is caused by the Duo-Cone seal kit. This will be
eliminated during the installation of coupling gear (40) .
13. Attach Tooling (F) and a suitable lifting device to sprocket housing (37) , as shown.
Carefully install the sprocket housing on the motor housing.
14. Install outer bearing cone (46) on the sprocket housing. Make sure that the outer bearing
cone is properly seated.
Illustration 13 g00625423
15. Install shims (42) that were determined in Steps 6.a through 6.f on the end of the sprocket
housing, as shown. If two shims were required, make sure that the thinnest shim is installed
on top.
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22. Illustration 14 g00625419
16. Put coupling gear (40) in the original position on the motor housing.
17. Apply Tooling (K) on the threads of bolts (39) that hold coupling gear (40) in position.
Tighten bolts (39) evenly and tighten bolts (39) in diagonally opposite pairs. Tighten bolts
(39) to a torque of 900 ± 100 N·m (664 ± 74 lb ft).
Illustration 15 g00625418
18. Install O-ring seal (38) in sprocket housing (37) .
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23. Illustration 16 g01033070
19. Thoroughly clean the mating surface of sprocket housing (37) that makes contact with the
ring gear (36) .
20. Apply a bead of Tooling (L) on the mating surface of ring gear (36) .
21. Attach Tooling (E) and a suitable lifting device to ring gear (36) . Position ring gear (36) on
the sprocket housing. Make sure that the alignment mark on the sprocket housing and ring
gear (36) line up with each other.
Illustration 17 g00625415
Illustration 18 g00625413
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24. Illustration 19 g00513451
22. Assemble carrier assembly (30) , as follows:
Note: If planetary gear (34) is stamped with an "N", make sure that the planetary gear
identification grooves are facing in the correct direction, which was noted during the
disassembly of the carrier assembly (30) .
a. Assemble carrier assembly (30) .
b. Put clean SAE 30 oil on bearings (35) .
c. Install bearings (35) in planetary gear (34) .
d. Install thrust washers (33) on each side of planetary gear (34) .
e. Install planetary gear (34) and thrust washers (33) in carrier (30) .
f. Install planetary shaft (32) in carrier (30) and through planetary gear (34) . Make sure
that the spring pin hole in the planetary shaft is in alignment with the spring pin hole
in the carrier.
g. Install spring pin (31) in the carrier and into the planetary shaft. Install the spring pin
until the spring pin is even with the outside surface of the carrier. Orient the split in
the spring pin horizontally to the carrier. Align the split in the spring pin to the left or
to the right. Refer to Illustration 19.
h. 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 (0.59 to 0.118 inch) from the spring pin hole.
i. Repeat Steps 22.a through 22.h for the remaining planetary gears.
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25. Illustration 20 g01033066
23. Attach Tooling (E) and a suitable lifting device to carrier assembly (30) . Position carrier
assembly (30) in ring gear (36) . It will be necessary to rotate carrier assembly (30) back and
forth during installation in order to engage all the gears properly.
Illustration 21 g00625528
24. Install spacer (22) on carrier assembly (30) , as shown.
25. Assemble carrier assembly (21) , as follows:
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2020/8/30
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