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Operation / Troubleshooting
2. The pump will not remove all water. On a flat surface
Model No. SDSU4 will pump down to within 1/8" of
the pumping surface. Model No. SDU25 will pump
down to within 5/8" of the pumping surface.
NOTICE: For continuous operation, the pump must
be submerged to prevent the motor from overheating.
A fully submerged pump is preferred for proper cool-
ing when a pump runs continuously.
AIRLOCKS
(FIGURE 2)
When a pump airlocks, it runs but does not move any
water. An airlock will cause the pump to overheat and fail.
The pumps have a built in anti-airlock hole. See the
exploded view on the repair parts page for the location
of the hole. Water leakage from the anti-airlock hole is
normal.
If you suspect an airlock, unplug the pump, clean out the
anti-airlock hole with a paper clip or a piece of wire, and
restart the pump.
Troubleshooting
SYMPTOM
Pump won't start or run.
Pump operates but
delivers little or no water.
For parts or assistance, call SHUR-DRI Customer Service at
PROBABLE CAUSE(S)
Pump is not plugged in.
Blown fuse.
Low line voltage.
Defective motor.
Restricted discharge
(obstacle or ice in piping).
Restricted intake.
Low line voltage.
Worn or plugged impeller.
The anti-airlock hole is plugged.
Figure 2: Anti-airlock hole is located under volute;
remove screen as shown for access.
CORRECTIVE ACTION
Check and see if pump is plugged in to a proper outlet.
If blown, replace with fuse of proper size or reset breaker.
If voltage is under recommended minimum. Check size of
wiring from main switch on property. If OK, contact power
company or hydro authority.
Replace pump.
Remove pump and clean pump and piping.
Remove the pump and clean out the intake screen.
The voltage is under recommended minimum. Check size of
wiring from main switch on property. If OK, contact power
company or hydro authority.
Replace pump.
Turn off the pump, clean out the anti-airlock hole, and
restart the pump.
1-800-535-4950
4
Anti-Airlock Valve
(Remove screen
and look under
pump for access)
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