5-8 4181384 First Edition
HYDROSTATIC POWER TRAIN
5
Troubleshooting
Symptom: Mower Will Not Move Forward or Reverse
Symptom: Mower Will Not Reach Full Speed
Symptom: Poor Hydrostatic Transmission
Response
Probable Cause Remedy
Hydraulic oil not at correct level in reservoir. Fill reservoir to correct level. (Refer to “Safety, Operation, and
Maintenance Manual” for the correct oil specifications.)
Tow valve open. Close tow valve.
Incorrect charge pressure relief setting. Test charge pressure relief valve setting. (See “Transmission
Neutral Adjustment” on page 5-18.)
Faulty charge pump. Test and repair. (See “Cutting Unit/Charge Pump Test” on
page 6-31.)
Faulty wheel motor. Test and repair. (See “Repair” on page 5-22.)
Faulty hydrostatic pump. Test and repair. (See “Traction Pump Tests” on page 5-14.)
Probable Cause Remedy
Hydraulic oil not at correct level in reservoir. Fill reservoir to correct level. (Refer to “Safety, Operation, and
Maintenance Manual” for the correct oil specifications.)
Tow valve open. Close tow valve.
Oil filter plugged. Replace filter; find source of contamination.
Air bubbles in hydraulic oil. Check suction line for air leaks.
Incorrect charge pressure relief setting. Test charge pressure relief valve setting. (See “Transmission
Neutral Adjustment” on page 5-18.)
Faulty charge pump. Test and repair. (See “Cutting Unit/Charge Pump Test” on
page 6-31.)
Faulty hydrostatic pump. Test and repair. (See “Traction Pump Tests” on page 5-14.)
Faulty wheel motor. Test and repair. (See “Repair” on page 5-22.)
Probable Cause Remedy
Hydraulic oil not at correct level in reservoir. Fill reservoir to correct level. (Refer to “Safety, Operation, and
Maintenance Manual” for the correct oil specifications.)
Tow valve open. Close tow valve.
Oil filter plugged. Replace filter; find source of contamination.
Incorrect charge pressure relief setting. Test charge pressure relief valve setting. (See “Transmission
Neutral Adjustment” on page 5-18.)
Faulty charge pump. Test and repair. (See “Cutting Unit/Charge Pump Test” on
page 6-31.)
Faulty hydrostatic pump. Test and repair. (See “Traction Pump Tests” on page 5-14.)
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