Multiquip MQD2H manual Troubleshooting, PUMP TROUBLESHOOTING Continued, Symptom, Possible Problem

TROUBLESHOOTING

TABLE 9. PUMP TROUBLESHOOTING (Continued)

SYMPTOM	POSSIBLE PROBLEM	SOLUTION
	Incorrect engine speed speed?	Increase engine speed.
	Piping is clogged or damaged?	Clean or replace piping.
	Clogged pump?	Clean pump well.
Flow rate is slow.	Discharge line restricted or undersize?	Flush out piping or replace.
	Collapsible disc hose?	Replace with rgid or noncollapsible hose.
	Too many hose bends?	Straighten hose.
	Hose lines too long?	Shorten hose lines.
	Faulty suction piping?	Replace piping.
	Pump located too far from fluid source?	Move pump closer to source.
Pump runs but no fluid.	Gate valve closed?	Open gate valve.
	Clogged strainer?	Clean or replace strainer.
	Discharge height too high?	Lower the height.
	Leak in suction line?	Repair suction line.
Pump starts and stops	Leak in foot valve?	Repair or replace valve.
pumping.	Diaphragm has a crack or hole?	Replace diaphragm.
	Defective or clogged flapper valves?	Clean or replace flapper valves.
Excessive noise while pump is	Pump not secured properly?	Secure pump.
in operation.	restricted suction line?	Clean or correct restriction.
Water can be seen on top of	Diaphragm has crack or hole?	Replace diaphragm.
diaphragm.	Screw loose holding diaphragm?	Tighten screw.
Pump stalls repeatedly or stops	Discharge height is over 25 feet (7.62 meters) of head?	Lower height.
for no apparent reason.	Material jammed in pump well?	Clean out pump well.

MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #6 (10/27/11) — PAGE 29