GPU 18-8 Hydraulic Power Unit
15
Troubleshooting
Tool used with power unit
Hydraulic fluid cold.
Viscosity of oil may be too high at
operates erratically.
start of tool operation. Allow oil to
warm to operating temperature.
Actuating tool intermittently will
reduce time required to warm oil
to an efficient operating temperature.
Hydraulic fluid level low.
Check fluid level. Fill to FULL mark.
Check system for leaks.
Incorrect hydraulic fluid viscosity.
Use fluid viscosity recommended.
See Recommended Hydraulic Fluids.
Air in system.
Check pump suction line for damage
or loose clamps. Tighten clamps or
replace components if necessary.
Fill reservoir.
Hydraulic oil flow (GPM) incorrect for
Adjust engine RPM to achieve
tool being used.
correct flow (GPM) for tool being used.
Hydraulic filter needs service.
Replace hydraulic filter.
Power unit components (pump, valve,
Repair or replace components.
etc.) worn or damaged.
Engine output insufficient. Engine
See engine operator’s manual.
needs adjustment, tune-up, etc.
Tool used with power unit
Hydraulic fluid level low.
Check fluid level. Fill to FULL mark.
feels hot.
Check system for leaks.
Hydraulic fluid viscosity too light.
Use fluid viscosity recommended.
See Recommended Hydraulic Fluids.
Hydraulic fluid dirty.
Drain reservoir, flush and fill with
clean fluid. Change filter.
Hydraulic oil flow (GPM) incorrect
Adjust engine RPM to achieve
for tool being used.
correct flow (GPM) for tool being
used.
Tool used with power unit
Hydraulic flow to tool reversed.
Reverse flow to tool. Check for
operates backward.
valve in system that has reversed
flow. Check hoses for proper flow.
Hydraulic pressure and return lines
Disconnect hoses. Reverse
connected to incorrect power unit or
couplers. Reconnect hoses to
tool ports.
proper power unit and tool ports.
PROBLEM
PROBABLE CAUSE
POSSIBLE REMEDY