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Troubleshooting
Condition
Pump does not operate.
Pump runs excessively.
Pump speeds up or runs erratically.
Pump runs, but output is low.
Lubricant leaking from safety
unloader valve.
Possible cause
No electric power to pump.
• Motor relay failure
• Motor overheated
• Motor tripped out on locked rotor protection
• Broken gearset or shaft
• Blown fuse
Pump motor polarity is reversed
Pump tube malfunction.
Outlet check damage or contamination.
Vent valve damage or contamination.
System component leaking.
Injector bypassing.
Low level of grease or reservoir is empty.
Follower plate is stuck and separated from grease.
Pump piston or checks are worn.
Motor speed control set too low.
Faulty inlet or discharge check valve in pump.
Pressure of system set too high.
Safety unloader damaged or contaminated.
Corrective action
Turn on or connect hydraulic supply to pump.
Replace relay
Turn power off for minutes and restart
Remove high pressure or repair cause of locked pump
Repair gearbox
Replace fuse, check for cause of overload
Check red motor lead is wired to positive side of circuit
Refer to manual .
Repair check or remove contamination.
Repair vent valve or remove contamination.
Repair leaks.
Repair injectors.
Refill reservoir.
Check follower plate and reservoir for damage.
Refer to manual .
Turn screw to speed up motor. Refer to manual .
Replace faulty components. Refer to manual .
Adjust pressure switch setting.
Replace safety unloader.
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