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HT650 On/Off Pneumatic Fan Clutch

The HT650 on/off pneumatic fan clutch delivers significant fuel savings by engaging only when cooling is required. The HT650 completely disengages in off mode and is controlled by the engine, resulting in the best possible response time. When engaged, the HT650 can deliver the maximum torque required by high-airflow capacity fans, without slipping.


  • Heavy-duty trucks
  • Medium-duty trucks
  • Variety of off-highway equipment


Actuation Air-engaged, spring-disengaged
Typical Horsepower RangeUp to 300 kW [400 HP]
Minimum Air Pressure Requirements 90 psi [620.5 KPA]
Maximum torque 135 N-m [1,194 in.-lbs.]
Mounting Pulley