Motor Brushes; Troubleshooting Chart - Enerpac PMUQ Serie Hoja De Instrucciones

4. Replace the fill plug.
5. DISPOSE OF USED OIL PROPERLY.
6.3 Cleaning the Reservoir
The reservoir can be removed for cleaning, and should be
cleaned at least once a year.
1. Remove vent/fill plug from reservoir. Tip the pump until all old
oil has drained out.
2. DISPOSE OF USED OIL PROPERLY.
3. You will need to remove the yellow shroud to get at the screws
that hold the pump to the reservoir. Use an Allen wrench to
remove the six screws securing shroud to the reservoir.
4. Disconnect wire(s) from solenoid valve. Mark wires before
disconnecting them from the 4-way valve.
5. Lift shroud from reservoir. DO NOT remove the foam
insulation. Use care to avoid damaging wires or pulling wire
connections off terminals.
6. Remove 8 screws holding pump to reservoir.
7. Lift pump from reservoir using care to avoid damaging pick-up
screens.
8. Remove gasket and discard.
9. Thoroughly clean the reservoir with solvent. Never use
water.
10. Use a soft bristle brush to clean intake screens. Rinse with
solvent.
11. Install a new gasket.
12. Position the coverplate on the reservoir. Make certain that the
gasket is visible all the way around the coverplate.
13. Secure pump to reservoir.
14. Place shroud over motor with shroud handle facing valve side
of pump.
15. Install the six mounting screws.
16. Reconnect wire(s) to solenoid valve.

TROUBLESHOOTING CHART

Symptom
Motor current draw is excessive.
Noisy pump operation.
Pump fails to maintain pressure.
Low oil output.
Pump builds pressure slowly
or erratically.
Pump is overheating.
REFER TO TORQUE WRENCH INSTRUCTIONS FOR WRENCH OPERATING PROCEDURE.
Possible Cause
1. Defective motor.
2. By-pass valve malfunction.
3. Damaged or worn piston blocks.
1. Piston block piston sticking. Springs or
balls damaged.
1. Oil leaking from one or more
components within the reservoir.
1. Pump component parts leaking.
2. By-pass valve may be malfunctioning.
3. Oil intake screens on piston blocks may
be clogged with debris.
4. Low oil level.
1. Internal leakage in valve.
1. Nylon tubing to heat exchanger is
disconnected
2. Thermostat malfunctions
17. Before reinstalling the heat exchanger, use compressed air to
blow dirt out of the heat exchanger.
18. Fill reservoir to inch below the vent/fill opening with new
Enerpac hydraulic oil. Reservoir capacity is 0.75 gallon (2.8
liters).

6.4 Motor Brushes

Check the electric motor brushes at least once every two years.
For pumps in heavy usage applications, check the brushes at
least once every six months.
DANGER: To avoid possible electrocution, pump must
be completely disconnected from electrical power
before brush servicing is attempted.
7.0 TROUBLESHOOTING (See Chart)
The Troubleshooting Chart is intended as a guide to help you
diagnose and correct various possible pump problems.
Only qualified hydraulic technicians should troubleshoot and service
the pump. For repair service, contact the Enerpac Authorized
Service Center in your area.
7.1 Circuit Breaker (Pumps with Date Code "F" and Later)
In the event of an electrical overload, the pump circuit breaker will
trip. After investigating and correcting the source of the overload,
push the circuit breaker button to reset.
7.2 Fuses (Pumps With Date Code "F" and Later)
Internal fuses protect the primary and secondary circuits of the
control transformer. If a fuse blows, investigate and correct the
source of the failure. Then, replace the blown fuse with a new
fuse of the correct rating. For fuse ratings, refer to the Repair
Parts Sheet for your pump model.
WARNING: Always disconnect electrical power before
replacing fuses.
1. Remove the motor. Test and replace if necessary.
2. Inspect and test the by-pass valve if required. Valve is preset. If
damaged or incorrectly set, replace.
3. Test and inspect the piston blocks. Replace if necessary.
1. Remove the piston blocks. Inspect and replace as required. Each
piston block is non-serviceable.
1. Remove the pump from the reservoir and perform the back
pressure test. Contact Enerpac for test procedure.
1. Perform the back pressure test to isolate leaks.
2. Test and inspect by-pass valve. Replace and set if necessary.
3. Inspect intake screens. Flush all components of contamination.
Replace damaged components.
4. Fill reservoir to proper level.
1. Disassemble valve and replace worn or failed parts.
1. Reconnect nylon tubing under pumping unit. Tubing will click into
place when it is properly connected.
2. Replace the thermostat.
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