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A flat view of an empty sandpitA flat view of an empty sandpit

Off-Highway Drives HT650 Fan Drive for Off-Highway Engines

HT650 fan drives for fuel savings

The HT650 on/off pneumatic fan drive 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. The HT650 also provides ample torque -- without slipping -- from high-capacity fans.


  • Variety of off-highway equipment
  • Medium- and heavy-duty trucks


Air-engaged, spring-disengaged
Minimum air pressure to disengage
620.5 KPA [90 psi]
Torque capacity
135 N-m [1,194 in.-lbs.]
Air location

Features & Benefits

  • Engine-controlled design engages only when needed for increased efficiency and fuel conservation
  • Provides maximum torque for high-airflow fans without slippage for optimum engine cooling
  • Design and operation allows increased available horsepower

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Product Details