MAINTENANCE
8. Hold the motor shaft with pliers or vice grips
through the opening in the pump adapter. Unscrew
the impeller nut off the end of the shaft (see Figure
20).
9. The impellers are keyed to the shaft and do not un-
screw. Insert two screw drivers on opposite sides
under the exposed impeller and pry the impeller
off (Figure 21) to remove it.
10. Carefully tap a small screwdriver or thin bladed
chisel in between the intermediate volute and the
pump adapter in two or three places around the
pump to separate the castings (Figure 22).
Do not
mar the sealing surfaces; do not break pieces out
of the adapter or volute – the castings are easily
damaged.
11. Remove the intermediate volute and slide the im-
peller spacer off of the shaft.
12. Remove the impeller. Don’t disturb the shaft keys if
you are only replacing the seal.
13. Rotate the seal spring retainer cup so that the slot
lines up with the shaft keys; remove the cup and
spring.
14. Remove the two cap screws holding the adapter
bracket to the motor.
15. With two screwdrivers on opposite sides of the
pump, carefully pry the pump adapter away from
the motor. This will pull the seal off of the motor
shaft.
Use caution to make sure that the ceramic
seal does not dig into the shaft and scratch the
shaft’s sealing surface.
Installation Of New Seal
1. Clean all gasket surfaces thoroughly before re-
assembly. Clean the seal bore cavity in the pump
adapter.
2. Wet the rubber seat ring with soapy water and push
the stationary part of the seal into the seal bore cav-
ity. Use a piece of 1” pipe pressing on a cardboard
washer (to prevent damaging seal surface) as a
press.
Make sure that the seal half is fully seated
in the seal bore cavity.
Remove the cardboard once
the seal is in place.
3. Make sure that the shaft keys are in place on the
shaft. If they are not, squeeze them in place now
with slip joint pliers.
Do not tap them or hit them
with a hammer; you could bend the shaft
(see
Figure 23). When the keys are correctly installed, the
adapter will pass over the keys without interference.
13
Figure 20
Figure 21
Figure 22
Use pliers –
with care –
no hammers.
Figure 23
