The Allison 4700OFS is a rugged fully automatic transmission designed for severe-duty off-road and vocational applications, particularly where high torque, durability, and PTO (Power Take-Off) support are critical. It belongs to Allison’s 4000 Series, which is known for heavy-duty performance in demanding environments.

Key Features of the Allison 4700OFS

✅ 6-Speed Automatic – Optimized gear ratios for off-road and heavy-load conditions.
✅ High Torque Capacity – Handles up to 1,650 lb-ft (2,237 Nm) input torque, making it suitable for large diesel engines.
✅ Off-Road & Severe-Duty Design (OFS) – Reinforced components for mining, construction, oil/gas, and logging applications.
✅ PTO (Power Take-Off) Support – Supports multiple PTO configurations for auxiliary equipment (e.g., hydraulic pumps, winches).
✅ Electronic Controls – Uses Allison WTEC IV or Advanced controls for precise shifting and diagnostics.
✅ Lock-Up Clutches – Improves fuel efficiency by reducing slippage under load.
✅ Oil-Air Cooler (OFS Model) – Enhanced cooling for extreme operating temperatures.

Common Applications

• Mining & Quarry Dump Trucks

• Heavy Construction Equipment (e.g., wheel loaders, bulldozers)

• Oilfield & Logging Trucks

• Military & Defense Vehicles

• Fire & Rescue Apparatus (with PTO-driven pumps)

Comparison to Other Allison 4000 Models

Maintenance & Troubleshooting Tips

• Fluid & Filters: Use Allison TES-668 or C4 fluid; change every 25,000–50,000 miles in severe conditions.

• PTO Usage: Ensure proper engagement to avoid transmission damage.

• Overheating: Check the oil-air cooler for blockages in dusty environments.

• Shift Issues: May require software recalibration or solenoid inspection.