HP 020598 - Manual (Page 8)

Operating Instructions and Parts Manual
8
Symptom Possible Cause(s) Corrective Action
Troubleshooting Chart
Little or no discharge
and unit will not prime
Loss of suction after
satisfactory operation
1. Casing not filled with
water
2. Total head too high.
3. Suction head exceeds that
for which pump is
designed
4. Impeller partially or com-
pletely plugged
5. Hole or air leak in suction
line
6. Foot-valve too small
7. Impeller damaged
8. Foot-valve or suction line
not submerged deep
enough in water, pulling
air
9. Insufficient inlet pressure
or suction head
10. Suction piping too small
11. Casing gasket leaking
12. Suction or discharge line
valves closed
1. Air leak in suction line
2. When unit was last
turned off, water
syphoned out of pump
casing
3. Suction head exceeds that
for which pump was
designed
1. Fill pump casing. Using a foot-
valve will extend pump life and
facilitate immediate priming.
2. Shorten suction lift and/or dis-
charge head
3. Shorten suction line and/or ver-
tical distance from liquid to
pump, install foot-valve and
prime
4. Disassemble pump and clean out
impeller
5. Repair or replace suction line
6. Match foot-valve to piping or
install one size larger foot-
valve
7. Disassemble pump and replace
impeller
8. Submerge lower in water
9. Increase outlet pressure by
adding more water to tank or
increasing back pressure by
turning gate-valve on dis-
charge line to partially closed
position
10. Increase pipe size to pump
inlet size or larger
11. Replace
12. Open
1. Repair or replace suction line
2. Refill (reprime) pump casing
before restarting
3. Shorten suction line and/or ver-
tical distance from liquid to
pump, install foot-valve and
prime
020598 and 020599
Document2 9/3/03 5:48 PM Page 8