Enerpac PME-Series - Manual (Page 4)

CAUTION: Reservoir must be vented whenever pump
is running. If not, a vacuum may develop in the
reservoir, preventing the flow of oil through the pump.
4. Be sure the pump switch is “OFF”. See Fig. 5.
Figure 5 - Pump Switch Positions
5. Plug power cord into outlet. Use correct power source. See
Table I, Specification Chart for specifications.
Keep power cords short to avoid power losses. The pump
motor may function at lower voltage, but motor speed and oil
flow will be reduced and motor may become damaged.
NOTE: If the supply cord becomes damaged, it must be
replaced by the manufacturer or its service agent or similarly
qualified person in order to avoid a hazard.
6. Press “l” on the pump switch to turn power on. Pressing the “l”
activates the electrical circuit, but does not turn the pump
motor on. The pendant switch activates the pump motor.5.1
Air Removal
When the wrench is first connected to the pump, air will be trapped
in the components. To ensure smooth and safe operation, remove
air by cycling wrench several times without load. Cycle until wrench
advances and retracts without hesitation.
Check oil level before operation.
NOTE: Perform “Air Removal” and “Pressure (Torque)
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).
NOTE: If the supply cord is damaged, it must be replaced by the
manufacturer or its service agent or similarly qualified person in
order to avoid a hazard.
5.2 Pendant Operation
Pendants supplied with the
Single-Acting Pumps
(PMU10022 and PMU10027)
have a momentary pushbutton
for “Advance”. The torque
wrench piston will “Retract” after
the “Advance” button is released.
Pendants supplied with the
Double-Acting Pumps
(PMU10422 and PMU10427)
have a three position switch
(See Figure 6). Press momentary
pushbutton for “Advance”.
Release “Advance” and the torque wrench piston will retract. Use
the “Retract” pushbutton if you need to start the unit in the retract
mode.
NOTE: For Double-Acting Pumps
The electric motor keeps running after the pendant is released.
Within 10 seconds of your last command from the pendant, the
motor will time-out and turn off, preventing heat build-up and
unnecessary wear and tear.
5.3 Pressure (Torque) Adjustment
CAUTION: 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. The pump is supplied with a pressure gauge installed. See
torque wrench instructions for amount of pressure required to
produce desired torque. Note that the maximum pressure
varies for different wrenches and accessories.
2. Loosen locknut and back out relief valve to prevent unintended
pressure build-up. See Figure 1.
3. Turn the pump on.
4. Press and hold the “Advance” pushbutton and read pressure
gauge.
5. While holding the “Advance” pushbutton, turn relief valve in
(clockwise) to increase pressure or out (counter-clockwise) to
decrease maximum pressure. Repeat until correct pressure is
obtained. Note: The "Advance" button mjust be released and
then repress to verify pressure when decreasing pressure
setting.
6. Tighten locknut on relief valve to maintain setting.
7. Run the pump several times to test the pressure setting.
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.
Figure 7 - Vent/Fill Plug
6.2 Changing the Oil
Completely drain the reservoir after every 100 hours of operation.
If pump is operated in very dusty areas or at high temperatures,
drain and refill after 50 hours of operation.
1. Remove the vent/fill plug from reservoir.
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. Reservoir
capacity is 0.75 gallon (2.8 liters).
“ON”
(Activates Electrical
Circuit Only.)
“OFF”
Momentary
“ADVANCE”
(can be used
instead of pendant.)
Figure 6 - Pendant
Press to
Retract
Press to
Advance
Vent/Fill Plug
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