Xylem IM078 Marlow Series 20EVP - Manual (Page 5)

5
TROUBLESHOOTING GUIDE
The following are some common causes of problems that may arise.
SYMPTOMS PROBABLE CAUSE RECOMMENDED ACTION
Will Not Prime No liquid Fill tank with liquid.
Air leak in suction line Tighten all joints or remake using new
compound.
Blocked suction line Clean strainer or suction line.
Worn seal Install new seal.
Suddenly Stops Clogged strainer or impeller Clean debris.
Pumping Missing or broken impeller key Replace.
Slowly Stops Clogged impeller, diffuser, lines or loose Clean debris and use strainer. Tighten filler
Pumping filler plug plug.
Excessive Leakage Worn seal Replace seal.
From Seal Well Vent
Will Not Worn seal Replace seal.
Hold Prime Suction lift too high Relocate pump closer to supply.
Air leak in suction line Fix leak.
Performance Poor Worn impeller or seal Replace with new impeller or seal.
Suction lift too high Relocate pump closer to supply.
Low Flow Motor not up to speed, low voltage Larger lead wires.
Or Pressure Air leak Tighten all joints or remake using new
compound.
Blocked line Clean strainer or suction line.
Worn seal Install new seal.
Incorrect rotation (three phase motor) Interchange any two leads to reverse the
rotation.
Noisy Operation Worn motor bearings Replace.
Low discharge head Throttle discharge.
Debris lodged in impeller Disassemble pump and clean out.
Cavitation Improve suction conditions.