Enerpac PMU-Series - Manual (Page 4)

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2. Check oil level in reservoir. Oil level should be 1 inch
below vent/fill plug opening. (See “6.1 Adding Oil to the
Pump.”)
3. Vent reservoir by turning vent/fill plug 1 to 2 turns
counter-clockwise from fully closed position.
CAUTION: Operating pump without a sufficient
amount of oil will damage pump. Add oil only when
system components are retracted or system will
contain more oil than pump reservoir can hold.
CAUTION: Reservoir must be vented whenever pump
is running. If not, vacuum may develop in reservoir
preventing the flow of oil through the pump.
4. Be sure the pump switch is “OFF.” (See Figure 5.)
5. Plug power cord into outlet. Be sure electrical power
source is the correct one for your pump. (See “3.0
Specifications” for electrical power source
specification).
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.
CAUTION: DO NOT attempt to operate pump on less
than 95 volts (190 volts for 220 volt models). Lower
voltages will cause pump malfunctions and damage
the motor.
6. Press “I” on the pump switch to turn power on. Pressing
the “I” activates the electrical circuit, but does not turn
the pump motor on. The pump motor is activated by the
pendant switch.
5.1 Pendant Operation
WARNING: Attempting to couple a hose to the pump
or torque wrench while coupler is under pressure can
result in personal injury or fluid leakage.
WARNING: To ensure proper operation, avoid
kinking or tightly bending hoses. If hose becomes
kinked or otherwise damaged, it MUST BE replaced.
Damaged hoses may rupture at high pressure causing
personal injury.
Pendants supplied with the Single-Acting Pumps
(PME10022 and PME 10027) 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
(PME10422 and PME 10427) have a three position switch.
Press bottom 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 — After the pendant
“Advance” or “Retract” pushbutton is released, the
electric motor will continue running for about 15
seconds before shutting off automatically. This
delay helps prevent heat build-up and unnecessary
wear and tear.
5.2 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.
Advance
Advance
Retract
Pump Model
• PME 10422
• PME 10427
Pump Model
• PME 10022
• PME 10027
Double-Acting
Torque Wrench
Single-Acting
Torque Wrench
Figure 4, Coupling Diagram
PME10022 and 10027 PME10422 and 10427
Momentary “ADVANCE”
(Can be used instead of
pendant)
Momentary “RETRACT”
(can be used instead of
pendant)
Figure 5, Pump Switch Positions
“ON”
(Activates electrical
circuit only.)
Momentary
“ADVANCE”
(can be used
instead of pendant.) “ON”
(Activates electric
circuit only.)
“OFF” “OFF”
“ON”
(Activates electrical
circuit only.)