Description
OEM-Quality Caterpillar 777G Wheel Station Assembly
Eliminate extended downtime during major power train overhauls and ensure long-term haul road reliability with a complete Caterpillar 777G Wheel Station Assembly. Designed specifically for Caterpillar’s 100-ton class (91.4-tonne nominal payload) off-highway mining trucks, this fully integrated wheel station combines the structural hub, spindle interface, planetary gear reductions, heavy-duty bearings, Duo-Cone seals, rim hardware, and oil-cooled multi-disc brake pack into a single drop-in unit.
Replacing the entire wheel station as a complete module guarantees factory-matched component tolerances, eliminates premature seal or bearing failure from mismatched wear, and gets your haul truck back on the bench faster.
Key Features & Benefits
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Complete Wheel-End Integration: Integrates the wheel hub, double-reduction planetary system, axle bearings, and force-cooled braking system into one pre-assembled module.
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High-Torque Planetary Reduction: Features Caterpillar’s robust planetary gear setup (6.87:1 planetary ratio / 18.83:1 total reduction ratio) to maximize low-speed rim pull without overloading the driveshaft or differential.
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Oil-Cooled Multi-Disc Brake System: Includes the housing and friction packs for Caterpillar’s liquid-cooled braking system, delivering superior, fade-resistant retarding power on continuous downhill hauls.
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Heavy-Duty Duo-Cone Metal Face Seals: Maintains absolute lubricant retention while completely sealing out fine quarry dust, abrasive slurry, mud, and water ingress.
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Direct OEM Fit: Built to exact Caterpillar 777G factory specifications for direct bolt-on mounting to standard front spindles or rear axle housings.
Verified Technical Specifications
| Parameter | Specification |
| Compatible Machine Model | Caterpillar 777G Off-Highway / Mining Truck |
| Component Group | Complete Wheel Station / Wheel Group Assembly |
| Nominal Truck Payload Capacity | 91.4 tonnes / 100 tons |
| Planetary Final Drive Ratio | 6.87 : 1 |
| Differential Gear Ratio | 2.74 : 1 |
| Total Rear Drive Reduction Ratio | 18.83 : 1 (Differential + Planetary Final Drives) |
| Standard Mining Tire/Rim Fitment | 27.00R49 (E4) |
| Braking System | Oil-Cooled Multiple Disc (Rear Retarding & Service Brakes) |
| Application | Rear Drive Wheel Stations & Front Steering Wheel Stations |








