Troubleshooting Guides
Hydrostatic Transmission Problems (continued)
Hydraulic noise (continued)
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
PTO will not stay engaged (continued)
Low charge pump output
PTO pressure control valve faulty
Gear or bearing noise with PTO engaged
PTO brake is not releasing. Check brake
piston, O-rings
PTO brake springs faulty
Gear noise, dependent on speed, direction
of travel or during a turn
Go through procedures in “Hydrostatic
Transmission Test” for additional tests
Brakes set or not releasing. See Brakes section
Drive shaft not turning pump input shaft or
charge pump key sheared
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
Mid PTO Engagement Problems
PTO will not engage
Check engagement solenoid circuit
PTO switch not working
PTO lube reduction valve orifice plugged
Engagement valve installed incorrectly
PTO pressure control valve faulty
PTO clutch piston leaking, input shaft seal leaking
or clutch disk worn
Low charge pump output
PTO shaft, gear or bearing failure
Engine stalls when PTO is engaged
Excessive load on PTO output. Remove load
Use higher engine rpm. Check engine performance
Hydraulic circuit in relief. Remove restriction or load
PTO brake is not releasing. Check brake
piston, O-rings
PTO shaft, gear or bearing failure
PTO will not stay engaged
Check engagement solenoid circuit
Engagement valve installed incorrectly
PTO clutch piston leaking, input shaft seal leaking
or clutch disk worn
PTO shaft slows down
Excessive load on PTO output. Remove load
Use higher engine rpm. Check engine performance
PTO lube reduction valve orifice plugged
Low charge pump output
PTO pressure control valve faulty
PTO clutch piston leaking, input shaft seal leaking
or clutch disk worn
PTO Shaft will not stop, or slow to stop
Check engagement solenoid circuit
Engagement valve installed incorrectly
PTO brake is not releasing. Check brake
piston, O-rings
Excessive load on PTO output. Remove load
PTO brake springs faulty
Transaxle Engagement Problems
Hydraulic transmission complaint
Brakes are applied or mis-adjusted
Rear drive wheels are locked up; will
not move directional pins down
Brakes are applied or mis-adjusted
Differential lock collar, pin or differential carrier
fail-ure
Check axle or differential gear failure
Rear wheel free-wheel; no transaxle drive;
hydraulic control valve pins are up
Check axle or differential gear failure
Differential lock collar, pin or differential carrier
fail-ure
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