An Improved Differential Housing is Now Used on Certain 777D, 777F, and 777G Off-Highway Trucks {3256, 3258, 3281} Caterpillar

OEM

CAT WDS (S/N: M6J1-UP)

Off-Highway Truck/Tractor

777D (S/N: DCB1-UP; AGC1-UP; FKR1-UP; 3PR1-UP; 2YW1-UP; 6XZ1-UP)

777E (S/N: KDP1-207)

777F (S/N: JRP1-3340; JXP1-UP)

777G (S/N: GT71-UP; T5A1-123; TNM1-1003; RDR1-505; T4Y1-210)

Reference: Disassembly and Assembly, RENR8428, "777D Off-Highway Trucks Power Train"

Reference: Disassembly and Assembly, RENR8304, "777F Off-Highway Trucks Power Train"

Reference: Disassembly and Assembly, KENR9931, "777G Off-Highway Trucks Power Train"

Description Of Change: An improved differential housing is now used on the machines listed above. The new housings are thicker which provides longer service life.

Adaptable To:

Illustration 1	g06144888
345-1983 Differential and Bevel Gear Gp (1) 499-3711 Differential Housing As (2) 504-4889 Differential Housing As (3) 8T-3282 Hard Washer (4) 8T-0656 Bolt

Use the following procedure to rework carrier assembly to provide sufficient clearance.

Rework Procedure

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Illustration 2	g06144909
273-2167 Differential Carrier

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Illustration 3	g06144905
273-2167 Differential Carrier (A) 65.0 ± 0.5 mm (2.56 ± 0.02 inch)

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Illustration 4	g06155221
273-2167 Differential Carrier (B) 7.6 mm (0.30 inch)

1. Check the bearing shoulder thickness in area shown in Illustration 2. If it is greater than dimension (B), mill a slot of dimension (A) wide leaving the shoulder dimension (B) thick, centered between the two bearing cap holes.