Elec
trical
6 - 9
Electrical
EP800AD (Acrobat™ HPU)
HPU Motor and Capacitor
The motor is an AC induction motor and has no serviceable parts. A single capacitor is
used to start/run the motor and it is mounted externally immediately beside the electrical
enclosure toward the user.
The capacitor can be checked with a standard capacitance meter. It may be replaced
independently of the motor in the event that it fails and the motor is not damaged.
The motor may also be replaced independently of the HPU hydraulics if necessary without
affecting the hydraulic components or draining the fluid.
Remove Motor:
1)
Remove the 4 Motor Bolts using a 1/4" socket.
2)
Slide the Motor from the hydraulic reservoir.
3)
Remove the Coupler and Bearing from the Motor.
Install Motor:
4)
Install the Bearing into the Motor. Install the Coupler into the Motor. Ensure the
Coupler is installed as shown below and aligned properly inside the motor.
5)
Slide the Motor onto the Adapter Plate. Ensure the slotted end of the Coupler fits into
the Pump.
6)
Install the 4 Motor Bolts. Torque the bolts to 20-25 ft-lbs (27-34 Nm).
Main Pressure Switch
The main pressure switch is responsible for cycling the HPU motor to
maintain a system pressure range of 830psi to 1350psi. The switch
connects 24VDC through internal contacts to the SSR which turns on the
HPU motor. The 24V power supply must be operational and all fuses
must be intact for the HPU motor to function.
A continuity check can be made across the two wires of the pressure
switch with the dump valve open. Continuity should be present.
Pressure Switch
Dump Valve
Motor to Pump Coupler
Motor Bearing
Adapter Plate
Motor Bolts
Motor
Capacitor
