5-28 4203780 First Edition
HYDROSTATIC POWER TRAIN
5
4WD Will Not Engage
4WD Will Not Disengage
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 4-41.)
4WD valve in control valve assembly sticking. Repair or replace 4WD valve. (See “Control Valve” on page 5-55.)
Secondary 4WD shuttle valve in 4WD valve assembly sticking. Repair or replace 4WD shuttle valve. (See “4WD Valve” on
page 5-53.)
Low charge pressure. Test charge pump. (See “Charge Pressure Test” on page 5-34.)
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 4-41.)
4WD valve in control valve assembly sticking. Repair or replace 4WD valve. (See “Control Valve” on page 5-55.)
Secondary 4WD shuttle valve in 4WD valve assembly sticking. Repair or replace 4WD shuttle valve. (See “4WD Valve” on
page 5-53.)
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