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| Name: | Allison Transmission Assembly Oil Field Series 9800OFS / 9800 OFS |
|---|---|
| Description: | Allison Transmission Assembly Oil Field Series 9800OFS / 9800 OFS |
| Part number: | 9800 OFS, 9800OFS |
Product Description
Allison Transmission Assembly Oil Field Series 9800OFS / 9800 OFS
The Allison 9800OFS is a heavy-duty automatic transmission specifically engineered for extreme oil field, mining, and off-highway applications. As part of Allison’s 9000 Series, it’s built to handle ultra-high torque, harsh environments, and continuous severe-duty cycles—making it a top choice for oilfield service trucks, heavy haulers, and specialized industrial equipment.
Key Features of the Allison 9800OFS
✔ 7-Speed Automatic – Optimized gear ratios for heavy loads and steep grades.
✔ Massive Torque Capacity – Up to 2,200 lb-ft (2,983 Nm) input torque (supports engines like Caterpillar C18, Cummins X15).
✔ OFS (Oil Field Series) Design – Reinforced components for:
Extreme dust, mud, and vibration
High ambient temperatures (desert/arctic)
Continuous PTO operation (e.g., frac pumps, cement mixers)
✔ Advanced Cooling System – Dual oil-to-air coolers for sustained high-load performance.
✔ PTO Support – Multiple SAE #1 and #2 PTO openings for hydraulic, pump, or winch drives.
✔ Electronic Controls – Allison TC10™ or WTEC IV with off-road shift strategies.
✔ Dual Hump Sumps – Prevents oil starvation on uneven terrain.
Typical Applications
Oilfield Service Trucks (frac sand haulers, cement trucks, blowout preventer transports)
Heavy Mining & Quarry Dump Trucks
Off-Road Cranes & Drilling Rigs
Military Logistics Vehicles (e.g., Oshkosh HET)
Comparison to Other Allison 9000 Models
| Model | Torque Capacity | Key Use | PTO Support | Cooling |
|---|---|---|---|---|
| 9800OFS | 2,200 lb-ft | Oil field/severe off-road | Yes (dual PTO) | Dual oil-air |
| 9800RDS | 2,200 lb-ft | On-highway heavy haul | Yes | Single cooler |
| 10000OFS | 2,600 lb-ft | Ultra-class mining | Yes | Triple cooler |
Maintenance & Critical Notes
Fluid Requirements: Allison TES-668 or C4 synthetic (change every 500–1,000 hrs in extreme conditions).
PTO Usage: Avoid engagement above 1,200 RPM to prevent damage.
Overheating: Monitor cooler fins for debris clogging (common in oilfield dust).
Rebuild Kits: Use Allison 29578521 for seal/gasket overhauls.
Troubleshooting Common Issues
Erratic Shifting: Check for contaminated fluid or failing speed sensors.
PTO Disengagement: Inspect clutch solenoid or control module.
High Temp Warnings: Verify cooler airflow and thermostat operation.
Need Specifics?
If you require:
Installation diagrams (e.g., for a Kenworth T880 oilfield truck),
PTO gear ratios,
Fault code diagnostics (e.g., "Check Transmission" light),
Provide details—I’ll give you exact technical data!
