5
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
A. MOTOR DOES NOT
1. No electrical power to pump
Check breaker, switchbox and wiring.
2. Auxiliary temperature-limiting
Allow motor to cool. Auxiliary temperature-limiting device will
device tripped
automatically reset.
3. Rotor or vanes jammed
Remove coverplate and check for damage or obstruction.
B. MOTOR RUNS, BUT
1. Tank level low
Add fuel to tank.
2. Clogged filter assembly
Remove and clean filter assembly.
3. Clogged or broken suction pipe
Remove pump and clear suction pipe, replace as needed.
4. Broken shaft key
Replace shaft key. Check rotor or vanes for obstruction.
C. PUMP FAILS TO PRIME 1. Air leak in system
Check for air leaks at all joints.
2. Bypass valve stuck open
Remove bypass valve and clean or replace as needed.
3. Check valve stuck open
Remove check valve and clean or replace as needed.
4. Rotor or vanes worn
Check rotor and vanes for excessive wear.
D. LOW FLOWRATE
1. Low voltage
Check incoming line voltage.
2. Clogged filter assembly
Clean filter assembly.
3. Air leak in system
Check for air leaks at all joints.
4. Bypass valve stuck open
Remove bypass valve and clean or replace as needed.
5. Rotor or vanes worn
Check rotor and vanes for excessive wear.
6. Outlet is blocked
Check all accessories for blockage.
7. Clogged or broken suction pipe
Remove pump and clear suction pipe, replace as needed.
E. MOTOR STALLS WHEN 1. Bypass valve stuck closed
Remove bypass valve and clean or replace as needed.
2. Rotor or vanes worn
Check rotor and vanes for excessive wear.
3. Low voltage
Check incoming line voltage.
F. FUEL LEAKAGE
1. Threaded joint loose
Check and reseal threaded joint.
2. Insufficient bolt torque
Retighten bolts.
3. Lost or damaged O-rings
Check O-rings for damage. Replace as needed.
4. Shaft seal worn or damaged
Fuel leaking from drain hole indicates shaft seal needs to
be replaced.
G. MOTOR OVERHEATS
1. Pumping high viscosity fluids
Pump only low viscosity fluids.
2. Clogged filter assembly
Clean filter assembly.
3. Clogged or broken suction pipe
Remove pump and clear suction pipe, replace as needed.
NO FLOW
NOZZLE IS CLOSED
TROUBLESHOOTING
RUN
