Multiquip S-500SERIES SUB. PUMP -TROUBLESHOOTING, Pump Troubleshooting, Symptom, Solution

S-500 SERIES SUB. PUMP —TROUBLESHOOTING

Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a breakdown, use Table 8 (Pump Troubleshooting) as a basic guideline for troubleshooting the pump. If the problem cannot be remedied, contact Multiquip's service department.

TABLE 8. PUMP TROUBLESHOOTING

SYMPTOM	POSSIBLE PROBLEM	SOLUTION
		Check that proper voltage (115 VAC, 60 Hz, single-phase ) is being
	Incorrect voltage/amps?	supplied to the pump. Also check that there is an adequate amount
		of current (amps) to run the pump. Check power source circuit
		breaker.
	Check electrical connections?	If using float switches check wiring, inspect power cord.
	Blown power fuse?	Replace fuse, check cause of blown fuse.
Pump Fails To Start
	Impeller locked?	Disconnect power cord and check for clogging and improper impeller
		clearance. Unclog pump. Check overload protection device.
		Use multimeter to check motor insulation. Insulation resistance must
	Wet motor windings?	be approximately 15 megaohms. If resistance is low, disassemble
		pump motor and bake windings to dry them.
	Defective motor and pump	Check for excessive bearing wear, if worn replace bearings. Replace
	bearings?	motor if defective.
	Twisted or restricted discharge	Lay hose flat un-kinked. Remove clog from hose line.
	hose?
	Clogged pump strainer?	Clean strainer.
Pump Fails to Deliver Full
		Use a voltmeter to check voltage while pump is energized. Voltage
Output
	Low voltage?	must be within ±10%. Check power source (no load and load). If an
		extension cord is used, make sure it has adequate current-carrying
		capacity for the required length.See Table 4.
	Impeller worn?	Replace impeller.
Water in Seal Oil	Defective water seal?	Replace water seal.
	Loose Oil Fill Plug?	Tighten securely.

PAGE 20 — S-500 SERIES SUBMERSIBLE PUMPS — OPERATION & PARTS MANUAL — REV. #0 (10/01/04)