TK711, TK721, TK722 and TK732 Track Feller Bunchers Machine Systems Caterpillar

Final Drive - Disassemble

Usage:

Disassembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	138-7576	Link Bracket	2
B	1P-1855	Retaining Ring Pliers	2
C	1P-1862	Retaining Ring Pliers	1
D	5P-5197	Retaining Ring Pliers	1
E	1P-2321	Puller Assembly⁽¹⁾	1
F	1P-0520	Drive Group	1
G	2P-8312	Snap Ring Pliers	1
H	138-7574	Link Bracket	3
I	1P-5546	Crossbar	1
	5F-7366	Screw	1
	1P-0523	Drive Plate	1
	9S-8546	Seal Installer	1
	6V-3532	Bolt	2
	8T-3282	Washer	2
J	1U-8758	Retaining Ring Pliers	1
K	1P-0074	Slide Hammer Puller Gp	1
	1P-0069	Head	1
	2P-2312	Puller Leg	3
L	1P-7407	Eyebolt	2
M	199-6557	Spanner Socket	1
N	4C-8359	Eyebolt	2
P	127-8458	Final Drive Disassembly and Assembly Bench	1
Q	127-8468	Reaction Bar As	1
R	3S-6224	Electric Hydraulic Pump	1
	8T-0820	Pressure Gauge	1
	3B-7722	Bushing	2
	1P-2376	Coupler Assembly	2
	1P-2377	Plug	2
	8F-0024	Hose Assembly	2
RR	-	5/16 inch drill bit	1

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⁽¹⁾	Use 6C-7887 Leg on the two gears that are removed in Step 16.

Start By:

Drain the oil from the final drive.
Remove the final drive. Refer to Disassembly and Assembly, "Final Drive - Remove" in this manual.

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Illustration 1	g00659659

Remove bolts (2) that mount travel motor (1).
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Illustration 2 g00659674
Attach a suitable lifting device to the travel motor. Remove the travel motor. The weight of the travel motor is approximately 54 kg (120 lb).
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Illustration 3 g00676009
Remove O-ring seal (3) from the travel motor.
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Illustration 4 g01020262
Remove plug (4).
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Illustration 5 g01020283
Fasten lifting straps and a hoist to the final drive sprocket. Remove the sprocket bolts (5) from final drive sprocket (6). Use a soft faced hammer to unseat the sprocket.
Remove final drive sprocket (6). The weight of the final drive sprocket is 91 kg (200 lb).
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Illustration 6 g01020294
Remove bolts (7) and the washers that hold cover (8) in place.
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Illustration 7 g01020301
Use forcing screws M12X50 mm (9) to elevate the cover. This action will allow enough clearance for your fingers to lift the cover off the final drive.
Remove cover (8).
If necessary, remove the spacer (Not Shown) from cover (8).
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Illustration 8 g00659771
Remove carrier assembly (10).
Disassemble carrier assembly (10), as follows:
1. Use Tooling (B) to remove retaining ring (11).
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  Illustration 10 g00660636
  
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  Illustration 11 g01020401
2. Use a soft faced hammer to remove planetary gear assembly (12). Tooling (E) may also be used to remove planetary gear assembly (12).
  Note: Rotate the planetary gear assembly so that the gear assembly comes off perpendicular to the carrier shaft.
3. Disassemble planetary gear assembly (12), as follows.
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  Illustration 12 g00659802
  
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  Illustration 13 g00659805
4. Use Tooling (C) to remove the second retaining ring (13).
  Note: When you remove the bearing assembly, the rollers will fall out of the bearing race. Put a rubber band around the bearing rollers as you remove the bearing assembly.
5. Remove two rings (14), and bearing (15) from planetary gear assembly (12).
6. Repeat Steps 12a through 12e for the other two planetary gears.
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  Illustration 14 g00659861
7. Remove the center shaft (16) from carrier assembly (10).
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  Illustration 15 g00746486
8. Use a hammer and a punch to remove washer (16a) from shaft (16).
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  Illustration 16 g00659844
9. Use Tooling (D) to remove retaining ring (17).
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  Illustration 17 g00659863
10. Remove sun gear (18) from carrier assembly (10).
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Illustration 18 g00659867
Remove carrier assembly (19).
Disassemble carrier assembly (19), as follows:
1. Use Tooling (D) to remove retaining ring (20).
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  Illustration 20 g00659879
2. Use Tooling (E) to remove planetary gear assembly (21).
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  Illustration 21 g00659889
  
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  Illustration 22 g00903928
3. Use Tooling (F) and a press to drive the bearing assembly out of planetary gear (21).
  Note: This is only one method for removing the bearing. You may also cut the bearing. Cut a notch in the bearing cup. Refer to illustration 22. Remove one row of the bearing rollers through the notch. Make sure that you catch the rollers, while you drive the bearing assembly out of planetary gear (21).
4. Repeat Steps 14a through 14c for the other two planetary gear assemblies.
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  Illustration 23 g00660095
5. Use Tooling (D) to remove retaining ring (22).
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  Illustration 24 g00660100
6. Remove sun gear (23) from carrier assembly (19).
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Illustration 25 g00660105
Use Tooling (D) to remove two retaining rings (26) from two of the planetary gear assemblies (24) from carrier assembly (25).
Note: There are two sets of bearing rollers for each planetary gear assembly. The bearing rollers for the lower bearing assembly will fall after the planetary gear assembly is removed.
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Illustration 26 g00660136
Use Tooling (E) to remove two planetary gear assemblies (24).
Note: Two planetary gear assemblies (24) are removed to access the retaining ring that holds the carrier assembly (25) to the motor housing.
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Illustration 27 g00660143
Use Tooling (G) to remove retaining ring (27).
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Illustration 28 g00660173
Use Tooling (H) and a hoist to remove carrier assembly (25).
Disassemble carrier assembly (25), as follows:
1. Use Tooling (E) to remove bearing race (28) from the two shafts of carrier assembly (25).
2. Use Tooling (D) to remove three retaining rings (26) from the three remaining planetary gear assemblies.
3. Use Tooling (E) to remove planetary gear assemblies from the carrier assembly.
4. Use Tooling (E) to remove the other three bearing races from the carrier assembly.
5. Disassemble planetary gear assemblies (24), as follows.
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  Illustration 30 g00660181
6. Remove bearing rollers (29), two bearing races (28), two rings (30), and retaining ring (32) from planetary gear (31).
  Note: Place a rubber band around the bearing rollers as you remove the bearings.
Fasten a hoist to the final drive, and turn the final drive over 180 degrees.
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Illustration 31 g00660205

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Illustration 32 g00660210

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Sudden release of spring force can cause injury.
To prevent the possibility of injury, follow the procedure to relieve the spring pressure.
Tighten Tooling (I) to relieve the spring pressure.
Use Tooling (J) to remove retaining ring (33).
Remove Tooling (I).
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Illustration 33 g00660226
Remove plate (34).
Remove plug (35).
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Illustration 34 g00660233
Remove springs (36).
Note: There is an inner spring and an outer spring in each spring set.
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Illustration 35 g00660240
Apply air pressure through the port of plug (32). Hold a finger over the port directly across plug (32) while you inject the air. This will unseat the brake piston (37).
Remove brake piston (37).
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Illustration 36 g00660245
Remove two backup rings (38) and O-ring seal (39) from the piston.
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Illustration 37 g00660451
Fasten a hoist to the final drive, and turn the final drive over 180 degrees in order for the discs and plates to fall out of the motor housing.
Remove discs and plates (40) from the motor housing.
Note: Note the orientation of the discs and the plates for installation purposes.
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Illustration 38 g00660462
Use Tooling (K) to remove washer (41).
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Illustration 39 g00744629
Use Tooling (J) to remove retaining ring (42).
Note: Tap on plate (43) to relieve the pressure that is on retaining ring (42).
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Illustration 40 g00660488

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Illustration 41 g00660455
Fasten a hoist to the final drive, and turn the final drive over 180 degrees, as shown.
Use Tooling (I) to remove coupling shaft (45), bearing (44), and plate (43).
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Illustration 42 g00660550
Disassemble coupling shaft (45), bearing (44), and plate (43), as follows.
1. Use Tooling (F) and a press to push the coupling shaft (45) through bearing (44) and plate (43).
  Note: Bearing (44) will stop once the bearing makes contact with the plates (X).
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  Illustration 44 g00660671
  
  Note: Spread plates (X) wide enough so that bearing (44) can be removed from plate (43).
2. Use Tooling (F) and a press to push bearing (44) out of plate (43).
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Illustration 45 g06387895

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Illustration 46 g06387826

Note: Use caution not to damage the cage of the bearing cone underneath nut (46).
Note: Use caution not to damage the threads on the spindle.
Drill four holes at Dimension (X). Holes at Dimension (X) should be 5 to 10 mm (0.20 to 0.39 inch) in diameter.
Use a suitable chisel to split nut (46) into two pieces at Dimension (X).
Remove nut (46) and all remaining contaminants.
Remove dowels (47).

127-8458 Final Drive Disassembly and Assembly Bench

Note: The following procedure is for using the final drive disassembly and assembly 127-8458 Bench .

Reference: Refer to the Tool Operating Manual, NEHS0673 for further procedures concerning 127-8458 Bench.

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Illustration 47	g00671089

Fasten Tooling (L) and a hoist to Tooling (M).
Lower Tooling (M) into the final drive. Make sure that the notches in nut (46) are aligned with the keys on Tooling (M). The approximate weight of Tooling (M) is 45 kg (100 lb).
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Illustration 48 g00671092
Fasten Tooling (N) and a hoist to the final drive. Keep the hoist attached.
Position a fork lift under adapter ring (48).
Raise the final drive and adapter ring (48) simultaneously.
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Illustration 49 g00671095
Raise the final drive and adapter ring (48) into the air so that you can bolt the final drive and adapter ring (48) together with five bolts (49).
Note: Place blocks under the adapter ring (48) while you tighten bolts (49).
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Illustration 50 g00671100
Remove the hoist from Tooling (N) and attach four chains and a hoist to the upper half of Tooling (P).
Remove the upper half of Tooling (P). The weight of the upper half is 816 kg (1800 lb).
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Illustration 51 g00671109
Install Tooling (N) and place adapter ring (48) and the final drive onto the lower half of Tooling (P). The weight of the final drive, adapter ring (48), and Tooling (M) is 522 kg (1150 lb).
Fasten the final drive onto the lower half of Tooling (P). Use eight 1 - 8THDX3.5 inch bolts (50) and eight 1 - 8THD nuts with washers.
Remove Tooling (N) and the hoist.
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Illustration 52 g00671117
Place Tooling (Q) into the final drive.
Fasten a hoist to the upper half of Tooling (P) and install the upper half of Tooling (P) to the lower half of Tooling (P). Pin the two halves together.
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Illustration 53 g00672359
Attach Tooling (R) to the pressure reducing valve manifold, as shown.
Set the torque level for the bench to 2000 psi (14500 lb ft). Do not exceed this pressure.
Reference: Refer to the Tool Operating Manual, NEHS0673 for setting the torque level.
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Illustration 54 g00671120

(51) 128-4075 Shaft As
Place hex shaft (51) through the bench and into Tooling (Q).
Remove locknut (46). The breakaway torque will vary. The nut will loosen usually at 1400 psi (10750 lb ft).
Fasten a hoist to the upper half of Tooling (P).
Remove the upper half of Tooling (P).

Disassembly Procedure for the Main Housing and the Motor Housing

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Illustration 55	g00674023

Fasten Tooling (N) and a hoist to main housing (52), as shown.
Separate the main housing (52) from the motor housing (53). The weight of the main housing is 204 kg (450 lb).
Note: Two outer races and one roller bearing will be removed with the main housing. The other roller bearing and the two Duo-cone seal kits will remain with the motor housing.
Disassemble motor housing (53), as follows.
1. Use two screwdrivers and remove bearing (54) from the motor housing.
2. Remove the Duo-cone seal kit (55) from the motor housing.
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  Illustration 57 g00674039
3. Remove the two backup rings and O-ring seal (56) from the motor housing.
4. Remove the other Duo-cone seal kit (57) from the motor housing.
Disassemble the main housing (52), as follows.
1. Remove bearing (58) from the main housing (52).
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  Illustration 59 g00675961
2. Turn main housing (52) over 180 degrees, as shown.
3. Remove bolts (59).
4. Install Tooling (A) and a hoist to housing (61).
5. Separate housing (61) from ring gear (60).
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  Illustration 60 g00676750
6. Remove race (62) with a brass punch and a hammer.
7. Rotate housing (61) over 180 degrees.
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  Illustration 61 g00676000
8. Remove race (63) from housing (61).
9. Remove O-ring seal (64) from housing (61).