New 3200-992
February, 2011
Cornell Pump Company
Adjusting:
Due to wear during operation, the clearance between the cutter ring, cutter plate, and impeller
should be checked and adjusted yearly.
- Disconnect external connections (inlet piping, discharge piping, coupling alignment, frame-
baseplate bolts/shims) to gain access to suction inlet of pump.
- Isolate and lockout all power to the pump and motor. Remove the coupling guard so that the
pump can easily be rotated by hand.
- Loosen cap screws holding stationary cutter plate (392B) to volute casing (2) or suction cover
(1). Do NOT completely remove from assembly.
- Bottom out the stationary cutter plate (392B) to the rotating cutter ring (392A) such they are
touching at their teeth. Remove debris if necessary.
- Evenly set stationary cutter plate (392B) to rotating cutter ring (392A) clearance between .010”-
.020” using adjustable set screws. Each 1/4 turn of set screw is approximately .010” of
adjustment. Start with a quarter turn to test setting clearances.
- Check clearances in at least three locations. Adjust as necessary.
(If clearances are not achievable, then replace with new cutter kit.)
- Evenly torque cap screws on stationary cutter plate to 20ft-lb.
- Re-check cutter clearance after torquing cap screws on cutter plate. Adjust as necessary to
achieve clearances within tolerance.
- Rotate pump by hand to check for rubbing. If rubbing is present, proceed through steps above
to set clearances again. If necessary, increase the clearance but within .010”-.020” range.
WARNING
Stationary cutter plate should NOT protrude above the volute casing or suction cover. Do NOT
reassemble if this condition exists. Pump will not seal.
- Connect pump back to external connections and place back into service.
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