777G Off-Highway Truck Power Train Caterpillar

Transmission, Transfer Gears, and Differential - Remove

Usage:

777G GT7

Removal Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	6V-3145	Load Leveler	1
B	6V-3669	Bolt	6
B	8T-3282	Washer	6
C	439-3939	Link Bracket As	2
D	1P-7405	Eyebolt	1

Start By:

Remove the lubrication pump assembly.
Drain the axle.

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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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Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.

Note: Install caps and plugs on all openings to prevent dirt or debris from entering the system. Cleanliness is an important factor. Before the removal procedure, the exterior of the component should be thoroughly cleaned. This will prevent dirt from entering the internal mechanism.

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Illustration 1	g01310773

Disconnect hose assembly (1).
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Illustration 2 g01310774
Remove cable strap (4). Remove bolts (2). Remove guard assembly (3).
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Illustration 3 g01310776
Attach a suitable lifting device onto drive shaft (5). The weight of drive shaft (5) is approximately 91 kg (200 lb). Remove bolts (6). Discard bolts (6). Position drive shaft (5).
Remove bolts (8). Discard bolts (8). Remove bearing and spider assembly (7).
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Illustration 4 g01310778
Disconnect harness assembly (9).
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Illustration 5 g01310782
Disconnect hose assembly (10).
Place a suitable container for storage or for disposal of oil under the transmission and transfer gear. The container will catch trapped oil during the removal from the transmission and transfer gear.
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Illustration 6 g06295254

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Illustration 7 g06127805

Typical Example

Note: If transmission is not equipped with a rear lifting eye, then attach Tooling (C) at locations (X).
Attach Tooling (A) and a suitable lifting device onto transmission, transfer gears, and differential (11).
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Illustration 8 g06295261
Install Tooling (B) (not shown) at location (X). Location (X) occurs six times around the circumference of the transmission. Tooling (B) holds the differential and bevel gear to the transmission.
Remove 26 full nuts (12) and the washers that hold the transmission in position.
Remove two full nuts (13) and the washers that hold the differential and bevel gear to the rear axle housing.
Remove the transmission, the transfer gears, and the differential from the machine. The weight of the transmission, transfer gears, and differential is 2223 kg (4900 lb).
Remove the O-ring seal from the differential carrier assembly.
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Illustration 9 g06295262
Remove two bolts (14) and the washers. Remove cover (15) and the shim pack behind the cover.
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Illustration 10 g06295263
Install Tooling (D) in pin (16). Pull on Tooling (D) to remove pin (16). Remove the seal from pin (16).