Enerpac PMU-Series - Manual (Page 5)

5
CAUTION: DO NOT exceed maximum rated pressure
of torque wrench. See wrench nameplate for rating.
Watch pressure gauge.
CAUTION: Check oil level after removing air.
Operating pump without a sufficient amount of oil
will damage pump.
NOTE: Perform “Air Removal” and “Relief Valve Adjustment:
1. during initial operation or start-up
2. when connecting a different wrench to the pump
3. when changing torque value (relief valve adjustment
only).
5.3 Pressure (Torque) Setting
WARNING: Make these adjustments BEFORE putting
torque wrench on nut or bolt head. The pump
pressure setting may be above the pressure needed
to provide the required torque for your application.
Exceeding required torque will cause equipment damage and
may lead to serious personal injury.
1. See torque wrench instructions for amount of pressure
required to produce desired torque.
2. Loosen lock nut and back out relief valve to prevent
unintended pressure build-up. See Figure 1.
3. Turn pump on. Press and hold the “Advance”
pushbutton, and read pressure gauge.
4. While holding the push button, turn relief valve in
(clockwise) to increase pressure or out (counter-
clockwise) to decrease maximum pressure. Repeat
until correct pressure is obtained.
5. Tighten lock nut on relief valve to maintain setting.
6. Run pump several times to test this pressure setting.
NOTE: Refer to torque wrench instructions for wrench
operating procedure.
6.0 MAINTENANCE
6.1 Adding Oil to the Pump
Check reservoir hydraulic oil level every 40 hours of
operation. Add Enerpac hydraulic oil when necessary to
bring oil level up to 1 inch below the vent/fill opening.
6.2 Changing the Oil
Completely drain the reservoir after every 100 hours of
operation. If pump is operated in very dusty areas, drain
and refill after 50 hours of operation. If pump is operated
at high temperatures, oil must be changed more
frequently.
1. Remove the vent/fill plug from reservoir. (See Figure 6.)
2. Tip the pump until all old oil has drained out.
3. Add new Enerpac hydraulic oil through vent/fill opening
until the oil level is 1 inch below the vent/fill opening.
4. Replace the fill plug.
5. DISPOSE OF USED OIL PROPERLY.
6.3 Cleaning the Reservoir
The reservoir can be removed for cleaning. If the pump is
used in a dusty environment, the reservoir should be
cleaned once a year. Install a new gasket when you clean
the reservoir.
1. Remove vent/fill plug from reservoir.
2. Tip the pump until all old oil has drained out.
3. DISPOSE OF USED OIL PROPERLY.
4. 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.
5. Disconnect wire(s) from solenoid valve. Mark wires
before disconnecting from 4-way valve.
6. Lift shroud from reservoir. The electric motor is wrapped
in foam to help keep it cool and quiet. DO NOT remove
the foam insulation. Use care to avoid damaging wires
or pulling wire connections off terminals.
7. Remove eight screws holding pump to reservoir.
8. Lift pump from reservoir using care to avoid damaging
pick-up screens.
9. Remove gasket and discard.
10. Thoroughly clean the reservoir with solvent. Never use
water.
11. Use a soft bristle brush to clean intake screens. Rinse
with solvent.
12. Install a new gasket.
13. Secure pump to reservoir. Torque bolts to 36 - 42 in-lbs.
[4,1 - 4,7 Nm].
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.
17. Fill reservoir with new Enerpac hydraulic oil until oil
level is 1 inch below the vent/fill opening. Reservoir
capacity is 0.75 gallon (2.8 liters).
Figure 6, Vent/Fill Plug
Vent/Fill Plug