24
Electric Hydraulic Power Unit Diagnosis
Chart
MODEL
CONDITION
POSSIBLE CAUSE
CORRECTION
All
Motor does not operate.
1. Discharged or defective battery.
1. Recharge or replace battery.
Power
2. Loose or corroded electrical connections.
2. Clean and tighten electrical connections.
Angling
3. Inoperative starter solenoid.
3. Replace starter solenoid.
Models
4. Malfunctioning control switch.
4. Replace control switch.
5. Malfunctioning motor.
5. Repair or replace motor.
All
Plow does not lower.
1. No current to “A” coil. (black and white wire)
1. Locate malfunction and repair.
Power
2. “A” cartridge jammed in closed position.
2. Clean or replace “A” cartridge.
Angling
3. Inoperative “A” coil. (black and white wire)
3. Replace “A” coil. (black and white wire)
Models
4. Lower Adj. screw
4. Adj lower Adj. screw
All
Plow creeps down.
1. Leaking “A” cartridge.
1. Clean or replace “A” cartridge.
Power
2. Leaking “A” cartridge O-ring.
2. Replace O-ring.
Angling
3. Leaking “B” check valve.
3. Clean or replace “B” check valve.
Models
4. Leaking Ram Packing Cup.
4. Replace Ram Packing Cup.
5. Leaking O-ring at bottom of lift cylinder.
5. Replace O-ring.
