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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
Troubleshooting
FAILURE MODE
CAUSE(S)
CORRECTIVE ACTION
Motor doesn’t run
Not wired properly
Follow wiring schematics
Faulty on/off switch
Replace switch
Power source is dead
Check fuse
Turn on power supply
Replace with good battery
Dead spot in motor
If all above are ruled out, replace motor
Faulty motor
Replace motor
Motor runs backward
Wired incorrectly
Follow wiring schematics
Switch in wrong position
Change switch position
Motor runs too fast
Input voltage is too high
Check power supply for correct voltage
Nothing is wrong – Series Wound motor is a
high speed motor (when under no load)
Applies to 108 Series only
Motor runs too slow
Input voltage is too low
Check power supply for correct voltage
Pump is running against a load
Ensure test valves are open (unrestricted)
Amp draw is too high
Incorrect motor input voltage
Verify correct voltage is used
Motor stalls out or quits
Fuse blown
Ensure correct fuse size is used
Motor thermal breaker kicked off
Allow motor to cool, shorten duty cycle
Motor incorrectly wired
Check wiring per drawing
Pump flow low
Motor turning too slow
Ensure correct input voltage
Solenoid valve is open
Ensure valve is closed
Pump flow too high
Motor running too fast
Ensure correct input voltage
No flow
Motor isn’t running
Ensure motor is connected and power is on
Air in the pump – not primed
Follow startup instructions for bleeding
Oil level in tank too low
Fill tank to proper level
Solenoid valve is open
Ensure valve is closed
Won’t build pressure
No load valve in circuit
Apply resistance to flow in circuit
Oil temperature too high/viscosity too low
Check oil temperature, cool as necessary, ensure
oil is thick enough for application conditions
Motor or voltage is incorrect
Ensure motor and voltage are right
Solenoid valve is open
Ensure solenoid valve is closed
