Caterpillar Cat 325C Excavator (Prefix BKW) Service Repair Manual (BKW00001 and up).pdf

Service Repair Manual
Models
325C and 325C L Excavator

Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 325C EXCAVATOR BKW
Configuration: 325C & 325C L Excavators BKW00001-UP (MACHINE) POWERED BY 3126B Engine
Disassembly and Assembly
325C Excavator Machine Systems
Media Number -RENR5367-11 Publication Date -01/01/2012 Date Updated -17/02/2017
i05453130
Final Drive - Disassemble
SMCS - 4050-015
S/N - BKW1-UP
S/N - BMM1-UP
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-2420 Transmission Repair Stand 1
B 439-3938 Link Bracket 2
C 154-6181 Forcing Bolt 1
D 439-3940 Link Bracket 2
E
5F-7366 Forcing Bolt 1
1P-5546 Crossblock 1
1U-9889 Crossblock 1
1P-0520 Driver Group 1
6V-7888 Puller Leg 2
1H-3112 Puller Assembly 1
1P-5551 Adjustable Screw Assembly 1
F - Loctite 5127 1
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325C & 325C L Excavators BKW00001-UP (MACHINE) POWERED BY 3126B En...
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https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

Start By:
a. Remove the final drive.
Note: Cleanliness is an important factor. Before the disassembly procedure, thoroughly
clean the exterior of the component. This action will prevent dirt from entering the internal
mechanism.
1. Put an alignment mark across the sections of the final drive for assembly purposes. The
parts must be reinstalled in the original locations.
Illustration 1 g00708089
2. Fasten the final drive to Tooling (A), as shown. The combined weight of the final drive and
final drive sprocket is approximately 312 kg (688 lb).
3. Remove bolts (1) and the washers that hold the cover in position.
4. Remove the setscrews from cover (2), and fasten Tooling (B) and a suitable lifting device to
cover (2), as shown. The weight of cover (2) is approximately 32 kg (70 lb). Remove cover
(2).
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5. Remove thrust plate (3) from cover (2).
6. Remove plugs (4) from cover (2).
7. Remove O-ring seals (5) from both plugs (4) that were in the cover.
8. Remove spacer (6) from carrier assembly (7).
9. Remove sun gear (8) from carrier assembly (7).
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10. Remove carrier assembly (7) by lifting the carrier assembly straight up. The weight of
carrier assembly (7) is approximately 14 kg (30 lb).
11. Disassemble carrier assembly (7), as follows.
a. Drive spring pin (10) into planetary shaft (9) with a hammer and a punch.
b. Remove planetary shaft (9) with spring pin (10) from the carrier assembly.
c. Remove spring pin (10) from planetary shaft (9) with a hammer and a punch.
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d. Remove thrust washers (11) and planetary gear (13) from the carrier assembly.
e. Remove bearing (12) from planetary gear (13).
12. Repeat Steps 11.a through 11.e in order to remove the remaining planetary gears from the
carrier assembly.
13. Remove sun gear (14) from carrier assembly (15).
14. Remove spacer (16).
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Note: It will be necessary to pry ring gears (17) away from main housing (18) in order to
install the lifting slings.
15. Fasten a suitable lifting device to ring gears (17), as shown. Remove the ring gears from
main housing (18). The weight of ring gears (17) is approximately 45 kg (100 lb).
16. Use a screwdriver or a chisel in order to separate two ring gears (17).
Note: Two ring gears (17) are held together with Tooling (F). It may be necessary to heat
ring gears (17) in order to soften the sealant. Do not heat over 135 °C (275 °F) for more
than thirty minutes.
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17. Position a 12.7 mm (0.50 inch) shackle under carrier assembly (15).
18. Fasten a suitable lifting device to the shackle.
19. Slowly lift carrier assembly (15) from the final drive. The weight of carrier assembly (15) is
approximately 39 kg (85 lb).
20. Disassemble carrier assembly (15), as follows.
a. Drive spring pin (20) into planetary shaft (19) with a hammer and a punch.
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b. Remove planetary shaft (19) with spring pin (20) from the carrier assembly.
c. Remove spring pin (20) from planetary shaft (19) with a hammer and a punch.
d. Remove thrust washers (21) and planetary gear (23) from the carrier assembly.
e. Remove bearings (22) from planetary gear (23).
21. Repeat Steps 20.a through 20.e in order to remove the remaining planetary gears from the
carrier.
22. Remove O-ring seal (24) from main housing (18).
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23. Remove bolts (25) from gear (26).
24. Use Tooling (C) in order to remove gear (26) from main housing (18).
Note: The motor housing will separate from main housing (18) once gear (26) is removed.
Make sure that the motor housing is supported.
25. Remove shims (27) from the main housing.
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26. Fasten Tooling (D) and a suitable lifting device to main housing (18), as shown.
27. Use a hammer and a punch in order to separate main housing (18) and the final drive
sprocket from motor housing (28). The combined weight of main housing (18) and the final
drive sprocket is approximately 82 kg (180 lb).
28. Remove Duo-Cone seal (29) from motor housing (28).
29. Remove alignment pins (30).
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30. Remove Duo-Cone seal (31) from main housing (18).
31. Use Tooling (E) in order to remove bearings (32) and (33) from the main housing.
32. If necessary, remove the final drive sprocket from the main housing.
33. Refer to Disassembly and Assembly, "Final Drive Sprocket - Remove and Install".
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
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Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 325C EXCAVATOR BKW
Configuration: 325C & 325C L Excavators BKW00001-UP (MACHINE) POWERED BY 3126B Engine
Disassembly and Assembly
325C Excavator Machine Systems
Media Number -RENR5367-11 Publication Date -01/01/2012 Date Updated -17/02/2017
i04758848
Final Drive - Assemble
SMCS - 4050-016
Assembly Procedure (227-6116)
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-2420 Transmission Repair Stand 1
B 138-7573 Link Bracket 2
C 1P-1863 Retaining Ring Pliers 1
D
194-3878 Spanner Wrench As 1
194-3884 Spacer 1
E 138-7574 Link Bracket 2
H 6V-7030 Micrometer Depth Gauge Group 1
J FT-2770 Leak Down Test Tool 1
K 1U-6396 O-Ring Assembly Compound 1
L 5P-3931 Anti-Seize Compound 1
M 1U-8846 Gasket Sealant 1
N 8T-0531 Duo-Cone Seal Installer As 1
P 5P-3931 Anti-Seize Compound 1
Q 240-1886 Drill Fixture Gp 1
R 9S-3263 Thread Lock Compound 1
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Note: Cleanliness is an important factor. Before assembly, clean all parts thoroughly in cleaning
fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be
deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or
damaged, use new parts for replacement. All disassembly and all assembly procedures must be
performed on a clean work surface and in a clean hydraulic area. Keep cleaned parts covered and
protected at all times.
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. Use Tooling (K) during the assembly procedure.
Note: Apply a light film of hydraulic oil to all components before assembly.
Note: Some of the images that are in this procedure do not show the sprocket assembly that is
attached to the final drive housing. If necessary, the weights that are given include the weight of
the sprocket assembly.
1. Apply Tooling (P) to the outer diameter of the bearings.
2. Use a suitable press to Install bearings (40) and (41). Make sure that bearing (41) and
bearing (40) contact the counterbore in housing (36) .
3. Use Tooling (N) to install Duo-Cone seal (39B) .
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4. Use Tooling (N) to install Duo-Cone seal (39A) onto housing (38).
5. Use Tooling (E) and a suitable lifting device to install housing (36) onto housing (38). The
weight of housing (36) is approximately 100 kg (220 lb).
6. Remove Tooling (E) from housing (36) .
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7. Install stopper plate (35). Do not tighten stopper plate assembly (35) at this time.
Note: Stopper plate (35) will secure housing (36) to housing (38) .
8. Install Tooling (E) and a suitable lifting device to housing (36). The combined weight of
housing assembly (36) and (38) is approximately 120 kg (265 lb). Install housing assembly
(36) and (38) in a suitable press.
9. Remove stopper plate (35) .
10. Assemble Tooling (D), as shown.
11. Install Tooling (D) into housing (36), as shown.
12. Apply a force of 4000 kg (8818 lb) to the top of Tooling (D). Rotate housing (36) in order to
seat the bearings.
13. Reduce the force on the top of Tooling (D) to 1000 kg (2205 lb).
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14. Use Tooling (H) to take a measurement in three locations. Average the three measurements
and record the average measurement as Dimension (W) .
15. Remove Tooling (D) .
16. Separate Tooling (D) .
17. Use a micrometer in order to measure the thickness at three locations of the spacer from
Tooling (D). Record the average measurement as Dimension (X) .
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18. Use a micrometer in order to measure the thickness at three locations of stopper plate (35).
Record the average measurement as Dimension (Y) .
19. Subtract Dimension (X) from Dimension (Y) and record this figure as Dimension (Z) .
20. Install stopper plate (35) onto housing (38). Do not tighten stopper plate (35) at this time.
Stopper plate (35) will secure the final drive assembly while the final drive assembly is
repositioned onto Tooling (A) .
21. Use Tooling (E) and a suitable lifting device to reposition the final drive assembly onto
Tooling (A). The combined weight of housing assembly (36) and (38) is approximately 120
kg (265 lb).
22. Secure the final drive assembly to Tooling (A) .
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23. Secure the spanner socket from Tooling (D) to stopper plate (35) .
24. In order to determine the final bearing preload, add Dimension (W) to Dimension (Z) and
record this figure as Dimension (V) .
25. Use Tooling (H) to measure the distance in three locations.
26. Tighten stopper plate (35) until the average of the measurements is equal to Dimension (V) .
27. Remove Tooling (D) .
28. Install Tooling (Q) and a suitable vacuum onto stopper plate (35) .
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29. Use a suitable drill and Tooling (Q) in order to drill a hole to the depth of 15 mm (0.6 inch)
in the stopper palte and in housing (38) .
30. Install dowel (37) .
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31. Apply Tooling (R) on bolts (35A). Install plate (35B) and bolts (35A) .
32. Repeat Steps 28 through 31 for the opposite side of stopper plate (35) .
33. Install O-ring seal (34) on housing (36) .
34. Install gear (33) on housing (36).
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35. Assemble carrier assembly (27), as follows.
a. Use a deburring tool in order to remove the metal burr from the openings in the
carrier.
b. Install two bearings (31) in planetary gear (32) .
c. Install thrust washers (30) and planetary gear (32) in the carrier assembly.
d. Install planetary shaft (28) in the carrier assembly.
e. Align the split in spring pin (29) to the top or to the bottom. Make a stake mark on
each side of the spring pin hole in the carrier. Each stake mark should be
approximately 1.50 mm (0.059 inch) from the outside diameter of the spring pin hole.
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f. Drive spring pin (29) into planetary shaft (28) with a hammer and a punch.
36. Repeat Steps 35.a through 35.e in order to install the other two planetary gears in the carrier.
37. Use two people to install carrier assembly (27) in gear (33). The weight of carrier assembly
(27) is approximately 38 kg (85 lb).
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38. Install spacer (26). Install gear (25) .
39. Assemble carrier assembly (19), as follows.
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a. Use a deburring tool in order to remove the metal burr from the openings in the
carrier.
b. Install bearing (23) in planetary gear (24) .
c. Install thrust washers (22) and planetary gear (24) in the carrier assembly.
d. Install planetary shaft (21) in the carrier assembly.
e. Drive spring pin (20) into planetary shaft (21) with a hammer and a punch.
f. Align the split in the spring pin to the top or to the bottom. Make a stake mark on
each side of the spring pin hole in the carrier. Each stake mark should be
approximately 1.50 mm (0.059 inch) from the outside diameter of the spring pin hole.
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g. Repeat Steps 39.a through 39.f in order to install the other two planetary gears in the
carrier.
40. Install carrier assembly (19) into gear (33) .
41. Install retaining ring (18) .
42. Install spacer (17). Install gear (16) .
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Note: Make sure that the oil passages in the shafts are oriented toward the center of carrier
assembly (15) .
43. Raise the temperature of carrier assembly (15). Lower the temperature of the shafts. Install
the shafts into carrier assembly (15) until the groove of the shafts is at Dimension (A).
Dimension (A) equals 25.00 ± 0.10 mm (0.984 ± 0.004 inch).
44. Make eight stake marks at distance of Dimension (C) from each shaft. Dimension (C)
equals 2.0 ± 1.0 mm (0.08 ± 0.04 inch). The width of each stake mark should be equal to
Dimension (B). Dimension (B) equals 4.0 ± 1.0 mm (0.16 ± 0.04 inch).
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Caterpillar Cat 325C Excavator (Prefix BKW) Service Repair Manual (BKW00001 and up).pdf

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