Horton Viscous Step-up Gear Drive System

Supplier: Norman G. Clark

The Horton VMaster Viscous Step-Up Gear Drive System is designed for engines with crankshaft mounted fan drives, requiring additional cooling performance.

The VMaster's Integral Step-Up Gear Box increases fan speed to prevent overheating. Compact, maintenance-free, and reliable, the Step-Up Gear Box can be configured to provide fixed speed ratios between 1:1.1 and 1:1.5 without changing drive system dimensions.

Benefits of Horton Viscous Step-up Gear Drive System

  • Application flexibility
  • Fuel efficiency
  • Weight reduction
  • No maintenance
  • Durability

Features of Horton Viscous Step-up Gear Drive System

  • Low inertia
  • Compact design
  • Configurable to customer requirements
  • Variable fan speed
  • Direct crankshaft mounting


  • Crankshaft mounted fan drives requiring additional cooling performance:
  • Heavy-duty trucks
  • Medium-duty trucks
  • Light-duty trucks
  • Off-highway equipment

Specifications of Horton Viscous Step-up Gear Drive System

  • Weight: 28 lbs [12.7 kg]
  • Fixed speed ratio range: 1:1.1 to 1:1.5
  • Input torque: Up to 885 in-lbs. [100 Nm]
  • Power: Up to 80.5 HP [60 kw]
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