9
TROUBLESHOOTING – P-120DEF
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
A. MOTOR DOES NOT
1. Fuse blown
Inspect fuse. If blown, replace.
2. Switch defective
Remove switch coverplate and inspect switch. Replace, if necessary.
3. Motor burned out
Remove motor from pump and test by connecting to 12-volt DC power supply.
Replace if necessary.
B. MOTOR RUNS BUT
1. System air leak
Make sure all fittings and connections are tight. Inspect suction pipe, bung
DOES NOT PUMP
adapter and pump inlet seals for leaks or damage.
FLUID
2. Drive key broken
Replace key.
3. Strainer clogged
Remove coverplate. Clean strainer. Install again.
4. Gear coverplate O-ring worn Remove coverplate. Inspect O-ring and replace if worn or damaged.
5. Bypass poppet stuck
Remove poppet and clean. Install again.
6. Suction pipe clogged,
Remove pump. Inspect suction pipe and clean or replace, as necessary.
damaged or missing
7. Gear drive shaft broken
Remove coverplate, gears, and motor. Remove and inspect drive shaft.
Replace, if necessary.
8. Gear wear
Remove the coverplate and inspect gears, and drive key. Gears must turn freely
with the drive key removed. Replace any worn or damaged parts.
C. LOW FLOWRATE
1. Low voltage or poor
Check for adequate battery voltage and good terminal connections.
connections
2. Strainer partially clogged
Remove coverplate. Clean strainer. Install again.
3. Suction pipe clogged or
Remove pump from tank. Inspect suction pipe and clean or replace, as
damaged
necessary.
4. Bypass poppet stuck
Remove poppet and clean. Install again.
5. Gear wear
Remove the coverplate and inspect gears, and drive key. Gears must turn freely
with the drive key removed. Replace any worn or damaged parts.
6. Discharge hose too long
Long hoses reduce flowrate. Shorten hose.
7. Power cord too long
Long cords reduce flowrate. Shorten cord.
D. RAPID OVERHEATING 1. Duty cycle too long
Do not exceed the standard duty cycle of 30 minutes ON and 30 minutes OFF.
OF MOTOR
Allow the pump to cool for 30 minutes.
2. Strainer clogged
Remove coverplate. Clean strainer. Install again.