Troubleshooting - MULTIQUIP ST3050D Operation And Parts Manual

Symptom
Pump Fails To Start
Pump Fails to Deliver Full
Output
Water in Seal Oil
90
60
30
0
ST3050D SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #4 (01/11/23) — PAGE 27
Troubleshooting (Pump)
Possible Problem
Incorrect voltage/amps?
Check electrical connections?
Blown power fuse?
Impeller locked?
Wet motor windings?
Defective motor and pump bearings?
Twisted or restricted discharge hose?
Clogged pump strainer?
Low voltage?
Impeller worn?
Defective water seal?
Loose Oil Fill Plug?
Performance Curve
100
200
Figure 21. Performance Curve

TROUBLESHOOTING

Solution
Check that proper voltage is being supplied to
the pump. Also check that there is an adequate
amount of current (amps) to run the pump.
Check power source circuit breaker.
If using fl oat switches check wiring, inspect
power cord.
Replace fuse, check cause of blown fuse.
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 be greater than 15
megaohms. If resistance is low, disassemble
pump motor and bake windings to dry them.
Check for excessive bearing wear. If worn,
replace bearings. Replace motor if defective.
Lay hose fl at unkinked. Remove clog from hose
line.
Clean strainer.
Use a voltmeter to check voltage while pump
is energized. 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 Cord Length and
SizesTable.
Replace impeller.
Replace water seal.
Tighten securely.
TOTAL HEAD
Max 86 ft
CAPACITY
Max 264 G.P.M
Capacity(US.G.P.M)
300