DIAGNOSTIC FLOW CHART FOR E-68 HYDRAULIC POWER UNITS
MODEL
CONDITION
POSSIBLE CAUSE
CORRECTION
E-68
Plow does not lift or lifts
1. Low hydraulic fluid level.
1. Add fluid to proper level.
slowly - motor operates.
2. Discharged battery.
2. Recharge battery.
3. Leaking or open “B” cartridge.
3. Clean or replace “B” cartridge.
4. No current to “B” coil. (Red wire)
4. Locate malfunction and repair.
5. Inoperative “B” coil. (Red wire)
5. Replace “B” coil. (Red wire)
6. Malfunctioning motor.
6. Repair or replace motor.
7. Malfunctioning pump.
7. Replace pump.
Plow does not Angle Right
1. Improper coupler engagement.
1. Engage coupler properly.
but Motor operates.
2. Mechanical bind or interference.
2. Eliminate mechanical bind or interference.
3. Malfunctioning coupler.
3. Repair or replace coupler
4. No current to “C” (Green Wire) coil.
4. Locate malfunction and repair.
5. Inoperative “C” (Green Wire) coil.
5. Replace coil.
6. Inoperative valve cartridge.
6. Clean or replace cartridge.
7. Leaking or open Pilot Check Valve
7. Clean or replace Pilot Check Valve
8. Leaking or open crossover relief valve.
8. Clean or replace crossover relief valve.
Plow Does Not Angle Left
1. Improper coupler engagement.
1. Engage coupler properly.
but Motor operates.
2. Mechanical bind or interference.
2. Eliminate mechanical bind or interference.
3. Malfunctioning coupler.
3. Repair or replace coupler,
4. No current to “D” (Yellow Wire) coil.
4. Locate malfunction and repair.
5. Inoperative “D” (Yellow Wire) coil.
5. Replace coil.
6. Inoperative valve cartridge.
6. Clean or replace cartridge.
7. Leaking or open Pilot Check Valve
7. Clean or replace Pilot Check Valve
8. Leaking or open crossover relief valve.
8. Clean or replace crossover relief valve.
Plow will not hold in
1. Air in cylinders and hoses.
1. Bleed cylinders and hoses. Tighten P.A.
angled position. cylinder gland nut.
2. Leaking “C” and or “D” cartridge O - rings.
2. Replace O - rings.
3. Defective “C” and or “D” valve cartridge
3. Replace cartridge.
4. Leaking Pilot Check Valve
4. Clean or replace Pilot Check Valve
5. Leaking crossover relief valve.
5. Clean or replace crossover relief valve
6. Crossover relief valve not set properly.
6. Replace/adjust crossover relief valve.
E-88 Diagnosis Chart ®
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