Troubleshooting Guides
Note: If your specific problem and/or solution is not
listed below, consult a qualified Tuff Torq Disstibator.
Hydrostatic Transmission Problems
Machine will not move on its own power
Free-wheeling linkage set for push or partially set
Control pedal linkage bent, binding or disconnected
Directional control valves leaking or stuck down
Brakes set or not releasing
Anti-cavitation valves leaking or stuck open
Charge pump scored or worn
Pump or motor valve plates scored or worn
Charge pressure relief valve leaking. Seat
valve or spring damaged
Drive shaft not turning pump input shaft or
charge pump key sheared
Machine will not move–Wheels locked up
Brakes set or not releasing
Will not move in one direction
Free-wheeling linkage set for push or partially set
Control pedal linkage bent, binding or disconnected
Directional control valves leaking or stuck down
Directional valve in wrong location
Anti-cavitation valves leaking or stuck open
Pump or motor valve plates scored or worn
Too aggressive in reverse
Free-wheeling linkage set for push or partially set
Linkage damper (shock absorber) failed
Directional control valves leaking or stuck down
Pump or motor valve plates scored or worn
Slow forward under load, or speed drops
when load is applied
Forward pedal height needs to be adjusted
Free-wheeling linkage set for push or partially set
Control pedal linkage bent, binding or disconnected
Directional control valves leaking or stuck down
Drive shaft not turning pump input shaft or
charge pump key sheared
Anti-cavitation valves leaking or stuck open
Directional valve in wrong location
Charge pump scored or worn
Pump or motor valve plates scored or worn
Filter plugged or suction side air leak. Check
filter, charge pump or case seal
Engine performance is poor or not operating or set
at correct operating speeds
Erratic speed
Free-wheeling linkage set for push or partially set
Linkage damper (shock absorber) failed
Control pedal linkage bent, binding or disconnected
Brakes set or not releasing
Directional control valves leaking or stuck down
Drive shaft not turning pump input shaft or
charge pump key sheared
Anti-cavitation valves leaking or stuck open
Charge pump scored or worn
Pump or motor valve plates scored or worn
Filter plugged or suction side air leak. Check
filter, charge pump or case seal
Charge pressure relief valve leaking. Seat
valve or spring damaged
Swash plate control shaft or bushing worn
Engine performance is poor or not operating or set at
correct operating speeds. See Engine diagnosis
Machine will not stop
Free-wheeling linkage set for push or partially set
Control pedal linkage bent, binding or disconnected
Brakes set or not releasing
Neutral adjustment is not correct
Anti-cavitation valves leaking or stuck open
Swash plate control shaft or bushing worn
Transmission operating hot
Free-wheeling linkage set for push or partially set
Control pedal linkage bent, binding or disconnected
Brakes set or not releasing. See Brakes section
Neutral adjustment is not correct
Oil cooler may be plugged with debris
Directional control valves leaking or stuck down
Anti-cavitation valves leaking or stuck open
Charge pump scored or worn
Pump or motor valve plates scored or worn
Hydraulic noise
Free-wheeling linkage set for push or partially set
Brakes set or not releasing. See Brakes section
Neutral adjustment is not correct
Drive shaft not turning pump input shaft or
charge pump key sheared
Directional control valves leaking or stuck down
Anti-cavitation valves leaking or stuck open
Charge pump scored or worn
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