Xylem GOULDS Marlow 20EVP Serie Manuel D'instructions page 5

TROUBLESHOOTING GUIDE
The following are some common causes of problems that may arise.
SYMPTOMS PROBABLE CAUSE
Will Not Prime No liquid
Air leak in suction line
Blocked suction line
Worn seal
Suddenly Stops Clogged strainer or impeller
Pumping
Missing or broken impeller key
Slowly Stops Clogged impeller, diffuser, lines or loose
Pumping filler plug
Excessive Leakage Worn seal
From Seal Well Vent
Will Not Worn seal
Hold Prime
Suction lift too high
Air leak in suction line
Performance Poor Worn impeller or seal
Suction lift too high
Low Flow Motor not up to speed, low voltage
Or Pressure
Air leak
Blocked line
Worn seal
Incorrect rotation (three phase motor)
Noisy Operation Worn motor bearings
Low discharge head
Debris lodged in impeller
Cavitation
RECOMMENDED ACTION
Fill tank with liquid.
Tighten all joints or remake using new
compound.
Clean strainer or suction line.
Install new seal.
Clean debris.
Replace.
Clean debris and use strainer. Tighten filler
plug.
Replace seal.
Replace seal.
Relocate pump closer to supply.
Fix leak.
Replace with new impeller or seal.
Relocate pump closer to supply.
Larger lead wires.
Tighten all joints or remake using new
compound.
Clean strainer or suction line.
Install new seal.
Interchange any two leads to reverse the
rotation.
Replace.
Throttle discharge.
Disassemble pump and clean out.
Improve suction conditions.
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