MAINTENANCE
Thermal Protection
9
Thermal Protection
The motor is a continuous duty type equipped with an automatic resetting heat sensor and may restart
unexpectedly. Heat sensor opening is an indication of motor overloading/overheating, which can be caused
by application issues such as:
•
an obstructed pump impeller
•
switch stuck in the ON position
•
pump running dry
•
pump air locked
•
pump short cycling
•
operating the pump at low heads (low discharge restriction)
•
excessively high or low voltage supply
•
inadequate wiring
•
incorrect motor connections
•
mis-application of the product
•
pump, motor, bearings, or seal that have reached the end of their useful life.
Any of these conditions must be corrected to extend the life of the pump.
Disassembly
NOTE:
To replace the impeller or inspect the pump for worn components, disassemble both the cutter and
volute.
Cutter Disassembly
1.
Clean the pump of all debris and deposits.
2. Lay the pump on a smooth, hard surface.
3. Scribe a mark between the seal plate and volute.
4. Remove the stationary cutter and cutter plate:
•
Remove the three (3) 6M bolts and lock washers with a 10 mm socket or wrench.
•
Lightly tap the stationary cutter assembly with a rubber hammer to remove from the volute.
5. Remove the impeller bolt and washer with a 5 mm Allen wrench or hex head socket.
•
Use a channel lock to hold the rotation cutter to keep it from spinning.
6. Remove the rotating cutter from the motor shaft.
Volute Disassembly
1.
Disassemble the cutter. Refer to
“Cutter Disassembly” on page 9
.
2. Remove the four (4) 8M bolts that hold the volute to the seal plate using a 13 mm socket.
3. If needed, lightly tap the volute with a rubber hammer to separate the volute from the seal plate.
4. Using 2 screwdrivers or gear puller, pull the impeller off of the motor shaft.
Risk of personal injury or damage to pump or other equipment.
•
This pump is equipped with a cutting mechanism that has very sharp edges. Use caution when
working on or near these parts.
•
Do not remove motor housing seal plate screws or top motor housing screws. The motor section of
the pump is permanently lubricated with dielectric oil and sealed at the factory. Removal of these
screws by anyone other than an authorized service center will break the seal and void the warranty.
