25
Instruction Manual
Oildyne 108/118 and 165/175 Series
Hydraulic Power Units
Bulletin HY22-3210A/US
Parker Hannifin
HPS Division
New Hope, MN 55428 USA
FAILURE MODE
CAUSE(S)
CORRECTIVE ACTION
Pressure decays rapidly
Fittings not tightened
Check hoses and fittings for leaks
Solenoid valve opened
Check solenoid for proper operation
No check valves installed
Verify ordering code includes checks
Pressure decays slowly
Fittings not tightened
Tighten all fittings
Won’t release opposite
check
Pilot check ratio exceeded
Maintain a high pressure to low pressure RV ratio
of no more than 5:1
Chatters on operation
Over-running load condition
Install counterbalance valve
Tank overflows during retract
Tank was overfilled when cylinder was
extended
Remove some oil from tank
Pump runs dry
Reservoir too small
Install correctly sized reservoir
Oil level in tank too low
Add oil to reservoir
Leaks at port
Fitting is cross-threaded
If not damaged, reinstall fitting
Fitting isn’t tight
Tighten to fitting torque spec
Fitting o-ring damaged
Replace o-ring or fitting
Incorrect fitting type
Examine adapter threads for damage. If none,
install correct fitting type
Motor loose
Motor mounting screws loose
Tighten to proper torque
Back pressure circuit not
working
Connections to cylinder(s) not made
correctly
Ensure ‘UP’ port is connected to Piston End of
cylinder(s)
Reservoir leaks
Tank is overfilled
Remove some fluid
O-ring seal at adapter is missing
Install new reservoir seal
O-ring seal at adapter is damaged
Install new reservoir seal
Reservoir mount screw is loose
Torque screw to spec
Not properly mounted
Check for incorrect mounting
Solenoid not releasing
Coil not energized (if N.C.)
Apply proper voltage to coil
Coil not de-energized (if N.O.)
De-energize coil
Troubleshooting
