Multiquip AP6 Series - Manual (Page 77)

AP6/AP8 SERIES TRASH PUMPS • OPERATION AND PARTS MANUAL — REV. #0 (06/11/14) — PAGE 77
TROUBLESHOOTING (PUMP CONTINUED)/CONTROL BOX
Troubleshooting (Pump Continued)
Symptom Possible Problem Solution
Premature mechanical seal failure
Inadequate lubrication? Regrease or refi ll with oil
Loss of lubrication? Check/replace lip seal
Piping not properly supported? Provide suitable bracing and supports
Cavitation (improper suction design)? Correct suction problems
Misalignment? Align all rotating parts
Discharge head too high? Lower if possible or select large piping
Incompatibility with fl uid being pumped? Check pumping fl uid properties
Fluid Discharging
Float obstructed or damaged? Clean or replace.
Priming chamber bumper obstructed or worn? Clean or replace.
Troubleshooting Control Box
Symptom Possible Problem Solution
Control system does not perform self test
Tripped overcurrent protection?
Correct fault, replace or reset overcurrent
protection
Faulty connection to battery? Check battery connections
Control system performs normal self test,
engine cranks, runs and shuts down
Only Battery LED illuminated Check battery connections
Only Oil Pressure LEDIlluminated
Correct low oil pressure condition or faulty
switch, correct wiring fault
Only Temperature LEDIlluminated
Correct overheating condition or faulty
switch, correct wiring fault
Only Aux LED Illuminated? If applicable
Correct fault condition (i.e. v-belt, coolant
level) or faulty switch, correct wiring fault
All normally closed shutdowns illuminate for
one second (control system reset)?
Add suppressor diodes, protect from nearby
lightening strikes, shield induced spikes
from other equipment, add electric motor
control relay