988G Wheel Loader Power Train Caterpillar

Final Drive and Wheel - Disassemble

Usage:

988G 2TW

Disassembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	138-7573	Link Bracket	3
B	1U-8222	Lifting Sling	3
B	1D-4574	Bolt (1/2 - 13 × 6 NC)	3
C	138-7575	Link Bracket	3

Start By:

Remove the final drive and the wheel. Refer to Disassembly and Assembly, "Final Drive, Brake, and Wheel - Remove" for the machine that is being serviced.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat^® products. Dispose of all fluids according to local regulations and mandates.

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Illustration 1	g00687223

Place the final drive and the wheel in a vertical position on a hard, level surface. The combined weight of the final drive and of the wheel is 770 kg (1700 lb).
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Illustration 2 g00687224
Remove four bolts (1) that fasten the planetary carrier to the wheel.
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Illustration 3 g00687225
Attach Tooling (A), a suitable hoist, and suitable lifting slings to planetary carrier (2), as shown.
Use the hoist in order to remove planetary carrier (2). The weight of the planetary carrier is 213 kg (470 lb).
Note: Steps 5 through 10 are used for the disassembly of the planetary carrier.
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Illustration 4 g00687226
Remove O-ring seal (3) from planetary carrier (2).
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Illustration 5 g00687227
Place the planetary assembly on suitable wood blocks, as shown.
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Illustration 6 g00687228
Use a soft faced hammer in order to remove planetary shaft (4) from planetary carrier (2).
Note: The planetary shaft is a slip fit to the planetary carrier.
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Illustration 7 g00687229
Remove two thrust washers (5) and planetary gear (6) from the carrier.
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Illustration 8 g00687230
Remove ring (8) and two bearings (7) and (9) from planetary gear (6).
Repeat Steps 6 through 9 for the remaining two planetary gears.
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Illustration 9 g00687231
Remove bolts (10) and retainer (11).
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Illustration 10 g00687232
Remove shim pack (12).
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Illustration 11 g00687233

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Illustration 12 g00687234
Install Tooling (B) in the hole of hub (13). Repeat this step for the two remaining holes, as shown.
Attach a suitable hoist to the lifting slings.
Use the hoist in order to remove hub (13) and gear (14) as a unit. The combined weight of the hub and of the gear is 143 kg (315 lb).
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Illustration 13 g00687235
Place hub and gear (14) on suitable wood blocks, as shown.
Note: Leave the lifting slings and the hoist attached to the hub and the gear.
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Illustration 14 g03847194
Remove eight bolts (15) and four plates (16).
Use the hoist in order to lift hub (13) from ring gear (14). The weight of the hub is 68 kg (150 lb). Remove bushing (13A) if needed.
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Illustration 15 g00687237

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Illustration 16 g00370585

Typical Example
To remove bearing cone (17) from hub (13), turn the hub so that the bearing cone is facing downward, as shown.
Note: Do not apply heat directly to the hub. Excessive heat may reduce the service life of the hub.
Use a suitable torch in order to heat the bearing cone evenly around the circumference. Continue to heat the bearing cone until the bearing cone falls from the hub.
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Illustration 17 g00687238
Install Tooling (C) to wheel (18).
Attach a suitable hoist and lifting slings to Tooling (C).
Use the hoist in order to carefully remove wheel (18) from the spindle. The weight of the wheel is 222 kg (490 lb).
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Illustration 18 g00687239
Remove Duo-Cone seal (19).
Use a hammer and a punch in order to remove bearing cups (20) and (21).
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Illustration 19 g00687240

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Illustration 20 g00370585

Typical Example
Remove Duo-Cone seal (23) from spindle (24).
To remove bearing cone (25) from spindle (24), turn the spindle onto the opposite side so that the bearing cone is facing downward, as shown.
Note: Do not apply heat directly to the spindle. Excessive heat may reduce the service life of the spindle.
Use a suitable torch in order to heat the bearing cone evenly around the circumference. Continue to heat the bearing cone until the bearing cone falls from the spindle.