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| Name: | Allison Automatic Transmission 4430OFS 4500OFS 4700OFS 4750OFS |
|---|---|
| Description: | AUTOMATIC TRANSMISSION for Allison Transmission Oil Field Series |
| Part number: | 4430OFS 4500OFS 4700OFS 4750OFS |
Product Description
AUTOMATIC TRANSMISSION 4430OFS 4500OFS 4700OFS 4750OFS for Allison Transmission Oil Field Series
The Allison 4000 Series Off-Highway Fully Automatic (OFS) transmissions are heavy-duty, rugged transmissions designed for severe-duty, off-road, and vocational applications.
Below is a detailed comparison of the 4430OFS, 4500OFS, 4700OFS, and 4750OFS models, including their key specs, applications, and differences.
Allison 4000OFS Series Overview
These transmissions are built for high torque, extreme conditions, and PTO-driven equipment in industries like mining, construction, oil/gas, and forestry.
| Model | Torque Capacity | Gears | Key Features | Common Applications |
|---|---|---|---|---|
| 4430OFS | 1,050 lb-ft (1,424 Nm) | 5-Speed | - Basic off-road durability - PTO support |
- Light mining trucks - Forestry equipment |
| 4500OFS | 1,250 lb-ft (1,695 Nm) | 6-Speed | - Improved efficiency - Enhanced cooling |
- Medium-duty dump trucks - Oilfield service vehicles |
| 4700OFS | 1,650 lb-ft (2,237 Nm) | 6-Speed | - Heavy-duty build - Oil-air cooler |
- Large mining haulers - Heavy construction rigs |
| 4750OFS | 1,850 lb-ft (2,508 Nm) | 6-Speed | - Highest torque in 4000 series - Extreme-duty components |
- Ultra-class mining trucks - Heavy military vehicles |
Key Features of 4000OFS Series
✔ Fully Automatic Shifting – No clutch pedal, reducing operator fatigue.
✔ PTO (Power Take-Off) Support – Drives hydraulic pumps, winches, and auxiliary equipment.
✔ Electronic Controls (WTEC IV/Advanced) – Optimized shifting for load and terrain.
✔ Lock-Up Torque Converter – Improves fuel efficiency and reduces heat buildup.
✔ Oil-Air Cooler (OFS Models) – Essential for extreme heat and dust environments.
✔ Durable Construction – Reinforced gears, shafts, and housings for harsh conditions.
Which Model to Choose?
4430OFS → Best for light off-road use (small dump trucks, light forestry).
4500OFS → Ideal for medium-duty applications (oilfield trucks, medium haulers).
4700OFS → For heavy mining, construction, and severe-duty needs.
4750OFS → Maximum torque for ultra-heavy loads (giant mining trucks, military).
Maintenance & Troubleshooting
Fluid Requirements: Use Allison TES-668 or C4 synthetic transmission fluid.
Service Intervals:
Normal duty: 50,000 miles
Severe duty (mining, dust): 25,000 miles
Common Issues:
Overheating → Check cooler for blockages.
Harsh shifting → Possible solenoid or software issue.
