- Off-Highway Truck/Tractor:
- 777D (S/N: AGY1-UP; AGC1-UP; FKR1-UP; 3PR1-UP; 2YW1-UP)
- Quarry Truck:
- 771C (S/N: 3BJ1-UP)
- 768B (S/N: 79S1-UP)
- 768C (S/N: 02X1-UP)
- 769C (S/N: 01X1-UP)
- 769D (S/N: 5TR1-UP)
- 772 (S/N: 11S1-UP)
- 773 (S/N: 63G1-UP)
- 773B (S/N: 63W1-UP)
- 773D (S/N: NBJ1-UP; 7ER1-UP; 7CS1-UP)
- 776 (S/N: 14H1-UP)
- 776B (S/N: 6JC1-UP)
- 776D (S/N: 5ER1-UP)
- 777B (S/N: 4YC1-UP)
- 777C (S/N: 4XJ1-UP)
- 784B (S/N: 5RK1-UP)
- 785 (S/N: 8GB1-UP)
- 785B (S/N: 6HK1-UP)
- 789 (S/N: 9ZC1-UP)
- 789B (S/N: 7EK1-UP)
- 793 (S/N: 3SJ1-UP)
- 793B (S/N: 1HL1-UP)
- 793C (S/N: 4AR1-UP)
- 771D (S/N: BCA1-UP; 6JR1-UP; 6YS1-UP)
- 775D (S/N: 6KR1-UP)
Do not perform any procedure and do not order parts that are outlined in this publication until you understand the information that is contained in this document.
ReferenceOperation and Maintenance Manual, SEBU7837, "Parking"
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Personal injury or death can result from fumes, gases and ultraviolet rays from the weld arc. Welding can cause fumes, burn skin and produce ultraviolet rays. Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing area. Wear eye, ear and body protection before working. Protect yourself and others; read and understand this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can cause death. Read and understand the manufacturer's instructions and your employer's safety practices. Do not touch live electrical parts. |
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The separately serviced ring seal and the expander ring must be assembled correctly into off-highway truck wheel and brake assemblies. The seal and the expander ring must be installed correctly in order to prevent brake cooling oil leakage into the differential.
| Rear Wheel and Brake Assembly Seals | |||
| Truck Model | Former Seal Assembly | New Seal Ring | New Seal Ring |
| 768B 768C 769 769B 769C 769D 771C 771D |
2D-6533 9X-7306 |
9X-7305 | 123-7264 |
| 772 772B 772D 773 773B 773C 773D 775C 775D |
9X-7309 | 9X-7307 | 123-2941 |
| 776 776B 776C 776D 777 777B 777C 777D |
2D-6507 9X-7309 |
9X-7307 | 123-2941 |
| 784B 785 785B 789 789B |
2D-6507 9X-7309 4D-0449 9X-7312 |
9X-7307 9X-7310 |
123-2941 123-7270 |
| 793 793B 793C |
9X-7312 9X-7315 |
9X-7310 9X-7314 |
123-7270 123-7270 |
| NOTICE |
|---|
Because the cross section size of the expander ring is the same size as the rear brake hub seal groove, the expander ring may be installed incorrectly. |
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| Illustration 1 | g01788137 |
View of the seal assembly that is installed incorrectly (A) Brake hub (B) Seal (C) Seal Ring | |
The seals may be installed into the rear wheel and the brake assemblies incorrectly. Refer to Illustration 1 in order to view the incorrect installation procedure. The following procedure will ensure that a reliable seal is retained between the rear hub and the retainer.
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| Illustration 2 | g01791075 |
View of the seal assembly that is installed correctly (A) Brake hub (B) Seal (C) Seal Ring (D) Yellow mark | |
- Install seal ring (C) to brake hub (A). View Illustration 2 in order to view the installation of seal ring (C). In order to ensure that seal ring (C) is correctly installed, make sure that yellow mark (D) is facing outward. This orientation is required in order to achieve the necessary seal face load after seal (B) is installed.
- Assemble seal (B) to seal ring (C). Refer to Illustration 2 in order to view the assembly of seal (B) to seal ring (C) .