Pd pump Systems neslab p/N 000878 Rev. 08/15/96 Service Manual

Motor Replacement
Tools required:
Wrench, 1/2" open-end or combination
Nut driver, 5/16"
Torque wrench, capable of 30 in/lb (170 cm/kg)
NOTE: The motor may be replaced without opening the fluid
system. Draining the unit is not necessary.
Ensure the unit is physically disconnected from line voltage
before attempting motor replacement. Turning the unit’s
power switch off is not adequate to provide safety.
1. Loosen the V-band clamp between the pump and the motor.
Pull the pump away from the motor to separate them.
2. Remove the nuts from the motor mounts using a 1/2"
wrench. If the top nuts are not accessible, remove the
bottom nuts by reaching under the shelf. The motor will
come out as long as one nut is removed from each motor
mount ... it doesn't matter whether from the top or bottom.
3. Jockey the motor off the shelf so the electrical connection
box is accessible. Remove the cover.
4. Disconnect wires, noting which terminals are used. Remove
old motor.
5. If a bronze pump coupling is being used between the pump
and motor, install a lubrication cup on the motor shaft as
described in COUPLING LUBRICATION. This step is not
required if a nylon coupling is used.
6. Turn the shaft of the new motor a few revolutions by hand.

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7. Connect wires to the new motor. Position new motor in the
unit.
Eye protection must be worn during this step.
8. Temporarily provide power to the motor. Jog the motor
briefly and observe that the direction of rotation matches the
arrow on the front of the pump. The motor shaft should turn
clockwise as viewed from the pump end.
9. Check that the slot in the pump is sharply rectangular,
without undue wear.
10. Be aware that the coupling is not symmetrical! The wide end
fits in the motor and the narrow end fits in the pump.
11. Ensure mating flanges of both pump and motor are clean
and free of burrs.
12. Join pump and motor, guiding coupling into place.
13. Check that flanges align tightly. Tighten V-band clamp to 15
- 30 in/lbs (85 - 170 cm/kg) of torque.

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