| WHAT TO CHECK |
HOW TO CORRECT |
| Casing not
initially filled with water |
Fill pump
casing |
| Total head too
high |
Shorten
suction lift and/or change head |
| Suction lift
too high, or too long |
Lower suction
lift, install foot valve and prime, or shorten length of suction line |
| Impeller
plugged |
Clean |
| Hole or air
leak in suction line |
Repair or
replace; do not use Teflon tape; use pipe sealing compound |
| Foot valve too
small |
Match foot
valve to piping or install one size larger foot valve. |
| Impeller
damaged |
Replace |
| Foot valve or
suction line not submerged deep enough in water |
Submerge lower
in water |
| Insufficient
inlet pressure or suction head |
Increase inlet
pressure by adding more water to tank or increasing back pressure |
|
Suction piping too small |
Increase to pump inlet size or one size larger |
|
Motor wired incorrectly |
Check wiring diagram |
|
Casing gasket leaking |
Replace |
|
Suction or discharge line valves closed |
Open |