Textron JACOBSEN R-311 69166, Техническое руководство по ремонту

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HYDROSTATIC POWER TRAIN
4203781 First Edition 5-27
5
Hydrostatic System Operating Hot
Excessive Traction Pump Noise
4WD Will Not Engage
4WD Will Not Disengage
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. (Refer to “Safety, Operation, and Maintenance
Manual.”)
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 5-34.) Repair or replace charge pressure relief
valve as needed. (See “Control Valve” on page 5-54.)
Slippage in pump or motor. Perform instrument tests. (See “Instrument Test Overview” on
page 5-34.)
Faulty relief valve. Test and repair. (See “Traction Pump Tests” on page 5-40.)
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.)
Hydraulic oil cold. Warm hydraulic oil to operating temperature.
Air in hydraulic system (air bubbles in hydraulic oil). Check suction line for air leaks. Repair as needed. Operate
various hydraulic systems until hydraulic system is free of air.
Traction pump worn or damaged. Repair or replace pump as needed. (See “Traction Pump” on
page 5-49.)
Probable Cause Remedy
4WD solenoid in control valve does not engage when 4WD switch
is placed in ON position. Problem in electrical circuit. (See Electrical section,
Troubleshooting—“Four Wheel Drive Circuit Schematic” on
page 4-42.)
4WD valve in control valve assembly sticking. Repair or replace 4WD valve. (See “Control Valve” on page 5-54.)
Secondary 4WD shuttle valve in 4WD valve assembly sticking. Repair or replace 4WD shuttle valve. (See “4WD Valve” on
page 5-52.)
Low charge pressure. Test charge pump. (See “Charge Pressure Test” on page 5-34.)
Reverse kick-out switch faulty or out of adjustment Test or replace reverse kick-out switch. (See “Reverse Kick-Out
Switch Adjustment” on page 5-30.)
Probable Cause Remedy
4WD solenoid in control valve does not disengage when 4WD
switch is placed in OFF position, or the traction pedal is moved to
the reverse position. Problem in electrical circuit. (See Electrical section,
Troubleshooting—“Four Wheel Drive Circuit Schematic” on
page 4-42.)
4WD valve in control valve assembly sticking. Repair or replace 4WD valve. (See “Control Valve” on page 5-54.)
Secondary 4WD shuttle valve in 4WD valve assembly sticking. Repair or replace 4WD shuttle valve. (See “4WD Valve” on
page 5-52.)
Reverse kick-out switch faulty or out of adjustment Test or replace reverse kick-out switch. (See “Reverse Kick-Out
Switch Adjustment” on page 5-30.)