An Improved Final Drive Ring Gear Retainer is Now Used on Certain 777 Off-Highway Trucks {4008, 4050}
- Off Highway Truck
- 777F (S/N: JRP1-UP)
- 777G (S/N: T5A1-UP; TNM1-UP; RDR1-UP; T4Y1-UP)
- Quarry Truck
- 777D (S/N: FKR1-UP)
- Water Delivery System
- CAT WDS (S/N: M6J1-UP)
Description Of Change: New final drive ring gear retainers are now used on certain 777 Off-Highway Trucks. The harder and more robust retainers have a larger surface area with the ring gear. The new retainers will improve load resistance and extend the service life to the final drive group.
Adaptable To: The new ring gear retainers are adaptable to and effective in production with the machines listed in Table 1.
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| Sales Model | Adaptable to Machines | Effective in Production with Machines |
| 777D | (S/N: FKR1-2421) | (S/N: FKR2422-UP) |
| 777F | (S/N: JRP1-3340) | (S/N: JRP3341-UP) |
| 777G | (S/N: RDR1-339; TNM1-840) | (S/N: RDR340-UP; TNM841-UP) |
| 777G OEM | (S/N: M6J1-125; T4Y1-200; T5A1-119) | (S/N: M6J126-UP; T4Y201-UP; T5A120-UP) |
Required Parts
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| Required Parts | |||
| Item | Qty | Part Number | Description |
| 1 | 8 | Retainer | |
| 2 | 24 | Washer | |
| 3 | 24 | Bolt | |
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| |
| Illustration 1 | g06003508 |
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Orientation view of retainers installed in the final drive group (1) Retainer (2) Washer (3) Bolt | |
- Remove existing 285-5520 Retainers.
Note: clean the hub threads using an M10 tap prior to installing new parts.
Reference: Refer to Disassembly and Assembly, "Final Drive - Remove " for your machine.
- Install four retainers (1), 12 washers (2), and 12 bolts (3) on each side of the machine.
Note: Apply Loctite® 243TM Blue Threadlocker to the threads and tighten bolts to a torque of
60 ± 12 N·m (44.3 ± 8.9 lb ft) .
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