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MAINTENANCE
DISMANTLING PUMP FOR REPLACEMENT PARTS
Before dismantling pump for replacement parts, clean pump
thoroughly.
REPLACING STATIONARY CUTTER PLATE AND ROTATING
CUTTER
All repairs must be done at the factory or at an authorized
Hydromatic service facility.
Disconnect all power and control wires to motor
at control panel before starting disassembly operations.
Never rely on opening circuit breaker only.
DISASSEMBLY OF STATIONARY CUTTER PLATE AND ROTATING
CUTTER
1.
Remove retaining washer and screw from end of shaft.
A screwdriver can be used to hold the shaft in place by
wedging it between one of the four socket head cap screws
and the rotating cutter while loosening the screw.
2.
Using a rubber mallet, or soft metal hammer, bump rotating
cutter in counterclockwise direction as thread is right-
hand. Unthread rotating cutter from shaft. Be careful to
not lose ring shims that space the rotating cutter from the
stationary cutter plate.
3.
Remove four socket head cap screws holding the stationary
cutter plate to the volute. Remove stationary cutter from
volute. If stationary cutter is stuck, the socket head cap
screws can be threaded into tapped back-off hole in plate.
Tighten screws to remove plate from volute.
4.
Inspect rotating cutter and stationary cutter plate for wear
and replace if worn.
5.
Make sure pocket in volute is clean and reinstall stationary
cutter plate using the four socket head cap screws. Apply
blue Loctite® to the threads. Do not overtighten cap
screws.
6.
Replace ring shims (if removed from the shaft) and thread
rotating cutter onto shaft. Make sure threads on shaft are
clean and use Never-Seez® or other graphite compound on
threads before replacing rotating cutter.
7.
Using a rubber mallet, or soft metal hammer, bump rotating
cutter in clockwise direction to make sure it is seated on
the impeller.
8.
To ensure proper operation of the cutter mechanism, the
gap between the stationary cutter plate and rotating cutter
must be no more than .008". To check the gap use a .008"
feeler gauge. If the .008" feeler gauge does not fit between
the surface of the stationary cutter and rotating cutter and
the motor shaft turns freely, the gap is set correctly. If the
.008" feeler gauge fits between the surfaces, shims must
be removed to close the gap
HYD01-1111 (12-01-20)
9.
Replace retaining washer and screw in the end of the shaft.
Be sure screw is tight. A screwdriver can be used to hold the
shaft in place by wedging it between one of the four socket
head cap screws and the rotating cutter while tightening
the screw.
10. Be sure shaft turns freely after reassembly. Some drag will
occur due to the seal, but there should be no binding or tight
spots when turning the rotating cutter.
11. If rotating cutter rubs or drags on stationary cutter plate,
recheck gap and re-shim rotating cutter.
TO REPLACE CAPACITORS ONLY
1.
Remove oil fill plug near the top of motor housing and pour
oil out.
2.
Loosen the cord nut on power cord until cord is loose
enough to push cord down into motor housing.
3.
Remove four bolts from motor housing and bump housing
with a plastic hammer to loosen. Lay pump on its side.
4.
Remove the housing carefully to be sure that enough cord is
pushed into the housing so as not to create tension on cord.
5.
Slide motor housing up far enough to expose the capacitors
and to be able to lay the housing down.
6.
Disconnect wiring from capacitor and loosen capacitor
clamp and slide capacitor out. Replace with new capacitor,
tighten clamp and reconnect.
7.
Check all wiring connectors to be sure they are secure.
8.
Be sure O-ring is in place.
9.
Slide motor housing back onto pump while pulling the cord
out slowly. Assemble motor housing with four bolts.
10. Reassemble cord nut. Be sure washers are seated and cord
is pulled up against the washers. Tighten nut securely.
11. Put pump upright and refill motor with Hydromatic
submersible pump oil. DO NOT OVERFILL WITH OIL.
Replace oil plug. Retighten plug firmly, but do not
overtighten.
12. Be sure pump turns freely before connecting power. Turn
pump on side and turn impeller, using screwdriver in slotted
shaft. Plug pump into receptacle to test operation. Pump
must run quietly and free of vibration.
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