Textron Jacobsen AR-5 Technical/Repair Manual

5-8 4181383 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
Symptom: Hydrostatic System Operating Hot
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 “Charge Pressure
Test” on page 5-15.)
Faulty charge pump. Test and repair. (See “Charge Pressure Test” on page 5-15.)
Faulty wheel motor. Test and repair. (See “Wheel Motors Test” on page 5-20.)
Faulty traction pump. Test and repair. (See “Traction Pump Tests” on page 5-18.)
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.
Air bubbles in hydraulic oil. Check suction line for air leaks.
Incorrect charge pressure relief setting. Test charge pressure relief valve setting. (See “Charge Pressure
Test” on page 5-15.)
Faulty charge pump. Test and repair. (See “Charge Pressure Test” on page 5-15.)
Faulty traction pump. Test and repair. (See “Traction Pump Tests” on page 5-18.)
Faulty wheel motor. Test and repair. (See “Wheel Motors Test” on page 5-20.)
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 “Charge Pressure
Test” on page 5-15.)
Faulty charge pump. Test and repair. (See “Charge Pressure Test” on page 5-15.)
Faulty hydrostatic pump. Test and repair. (See “Traction Pump Tests” on page 5-18.)
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.
Faulty hot oil shuttle valve. Inspect and repair. (See “4WD Valve” on page 5-32.)
Oil cooler has dirt or debris in fins. Clean oil cooler fins of dirt and debris.
Incorrect charge pressure relief setting. Test charge pressure relief valve setting. (See “Charge Pressure
Test” on page 5-15.)
Faulty charge pump. Test and repair. (See “Charge Pressure Test” on page 5-15.)
Faulty relief valve. Test and repair. (See “Traction Pump Tests” on page 5-18.)

Textron Jacobsen AR-5 Specifications

General

Brand	Textron
Model	Jacobsen AR-5
Category	Lawn Mower
Language	English