HP 20598 Operating Instructions And Parts Manual page 9

Operating Instructions and Parts Manual
Troubleshooting Chart (continued)
Symptom
Loss of suction after
satisfactory operation
(continued)
Pump overloads driver
(gas engine shuts off
before complete hose
fill)
Pump vibrates and/or
makes excessive noise
Pump runs but no fluid
Possible Cause(s)
4. Insufficient inlet pressure
or suction head
5. Clogged foot-valve,
strainer or pump
1. Total head lower than
pump rating. Unit deliver-
ing too much water
2. Specific gravity and vis-
cosity of liquid being
pumped different than
the pump rating
3. Speed too high
1. Mounting plate or foun-
dation not rigid
enough
2. Foreign matter in pump
causing unbalance
3. Impeller bent
4. Cavitation present
1. Faulty suction piping (air
leak)
2. Pump located too far
from fluid source
3. Gate valve closed
4. Clogged strainer
5. Fouled foot-valve
6. Discharge height too
great
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020598 and 020599
Corrective Action
4. Increase inlet pressure by adding
more water to tank or increasing
back pressure by turning gate
valve on discharge line to partial-
ly closed position
5. Unclog, clean or replace as neces-
sary
1. Increase back pressure on pump
by turning gate valve on dis-
charge line to partially closed
position that will not overload
motor
2. Pump is designed for water, use
only for liquids which have simi-
lar characteristics.
3. Check and correct, lower speed
1. Reinforce
2. Disassemble pump and remove
3. Replace impeller
4. Check suction line for proper size
and check valve in suction line if
completely open, remove any
sharp bends before pump and
shorten suction line
1. Replace
2. Relocate
3. Open
4. Clean or replace
5. Clean or replace
6. Lower the height