Parker Oildyne 108 Series - Troubleshooting - Pressure and Leaks; Rapid Pressure Decay Troubleshooting; Slow Pressure Decay Troubleshooting; Opposite Check Valve Release Issues

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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 ttings 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 ttings
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 overlled 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 tting
Fitting isn’t tight Tighten to tting torque spec
Fitting o-ring damaged Replace o-ring or tting
Incorrect tting type
Examine adapter threads for damage. If none,
install correct tting 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 overlled Remove some uid
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