14
GB947 HYDRAULIC POWER UNIT
8/23
Providing all maintenance conditions have been met, follow this systematic approach to diagnosis.
1. MOTOR WILL NOT START.
a)
No power or wrong voltage. Check the power supply & voltage.
b)
Damaged power cord. Contact customer service.
c)
Tripped circuit breaker. Ensure electrical supply is adequate.
d)
Loose or faulty wiring. Contact customer service.
2. ERRATIC CYLINDER ACTION.
a)
External leak. Tighten all connections.
b)
Internal hydraulic leak. Contact service center.
3. PUMP FAILS TO MAINTAIN PRESSURE.
a)
External leak. Tighten all connections.
b) Internal hydraulic leak. Contact service center.
c)
Pump or valve malfunction. Contact service center.
4. CYLINDER EXTENDS PARTIALLY.
a)
Hydraulic oil level too low in pump. Fill and bleed the system.
b)
Load is above the capacity of the system. Use the correct equipment.
c)
Cylinder is sticking or binding. Contact service center.
5. CYLINDER MOVES SLOWER THAN NORMAL.
a)
Loose connection or coupler. Tighten.
b)
Restricted hydraulic line or fitting/ Clean and replace if damaged.
c)
Pump not working correctly. Check pump operating instructions.
d)
Cylinder seals leaking. Replace cylinder.
6. CYLINDER LEAKS HYDRAULIC OIL.
a)
Worn or damaged seals. Replace cylinder.
7. CYLINDER WILL NOT RETRACT OR RETRACTS SLOWER THAN NORMAL.
a)
Loose couplers. Tighten couplers.
b)
Weak or broken retraction spring. Replace cylinder.
c)
Cylinder damaged internally. Replace cylinder
d)
Pump reservoir too full. Drain hydraulic oil to correct level.
8. MOTOR CUTS OUT.
a)
Extension chord too long. Replace.
b)
Faulty motor. Replace or repair.
c)
Overheated motor trips circuit breaker. Allow motor to cool, reset circuit breaker.
TROUBLESHOOTING