SP | Trouble Shooting
Stops pumping until motor is stopped and re-started
CAUSES
CURES
Collapsing suction hose lining.
Replace suction line and strainer.
Slowly stops pumping
1. Clogged impeller, volute
suction line or check valve.
2. Loose clean out cover.
Clean out debris from impeller eye area, suction check valve.
(Follow instructions on other pages)
Clean sealing surface and o-ring gasket and tighten hand knobs.
Excessive leakage (oil and liquid being pumped) through seal cavity vented hole
Worn pump shaft seal.
Replace seal (follow instructions on other page).
Will not hold prime
1. Dislodged or worn check valve.
2. Loose cleanout cover.
3. Loose check valve cover plate.
Clean or replace check valve – clean sealing surface.
Check gasket, replace if necessary. Tighten cover plate.
Check gasket. Replace if necessary. Tighten cover plate screws.
Poor performance
1. Dislodged or worn check valve.
2. Motor not up to speed:
a. Low voltage
b. Worn bearings.
3. Excessive clearance between
impeller and wear plate.
Install new impeller, seal or wear plate.
a. Larger lead wires required.
b. Replace or rebuild.
Adjust to 0.5mm to 0.7mm clearance. (Follow instructions on
other pages)
Noisy operation
1. Worn motor bearings.
2. Low discharge head.
3. Impeller clogged.
4. Worn coupling or
misalignment.
5. Units opening at extreme left or
right end of performance curve
(capacity too high or too low).
Replace.
Throttle discharge.
Remove clean-out cover and clean impeller.
Replace or realign coupling.
Adjust for best performance point of operation.
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