4
Pump
Servicing
Servicing should be performed
only by an authorized
Hydromatic service center.
WARNING: Always disconnect
the pump from power source
before handling or making
any adjustments. Always wear
rubber boots when there is
water on the floor and you
must unplug the pump or make
any adjustments.
NOTE: Automatic thermal
overload protects the
sealed-in-oil motor. Running
dry may overheat the motor
and activate the overload pro-
tector until the unit cools.
Pump does not run or
just hums.
1. Line circuit breaker may be
off, blown or loose.
2. Water level in sump may be
too low to activate automatic
float or diaphragm switch.
3. Pump and/or switch cord plug
may not be making contact
in receptacle.
4. If pump is using the series
(piggyback) cord plug, the
two plugs may not be plugged
tightly together.
5. Float may be stuck. Be sure
float operates freely in basin.
6. If the unit is being operated
by the optional float control
switch, unplug the pump from
the piggyback receptacle and
plug the pump directly into
the power source. If the pump
starts each time it is plugged
directly into the receptacle
and does not start each time
when plugged into the piggy-
back switch with the float
raised up to a start position,
replace the complete piggy-
back switch assembly and
retest with new assembly.
7. If all symptoms check OK,
motor winding may be open;
take to authorized service
center for check.
Pump runs but does not
deliver water.
1. Check valve may be installed
backward. Arrow on valve
points in direction of flow.
2. Discharge gate valve, if used,
may be closed.
3. Pump may be air locked. Start
and stop several times by
plugging and unplugging cord.
Check vent hole in pump case
for plugging.
HYDROMATIC pumps have
a small air vent hole in the
impeller cavity to let out
trapped air. If this hole
becomes plugged, pump may
air lock. To break the air lock,
use a small screwdriver to
clear hole in the impeller
cavity.
As a secondary precaution in
installations of this type —
1 ⁄ 16" hole should be drilled
in the discharge pipe below
the check valve. The check
valve should be 12 to 18
inches above pump discharge.
Do not put check valve
directly into pump discharge
opening.
NOTE: In sumps where the
pump is operating daily, air
locking rarely occurs.
4. Pump head may be too high.
Pump cannot deliver water
over 25' vertical lift.
Horizontal distance does not
affect pumping, except for
friction loss through the pipe.
5. Inlet in pump base may be
clogged. Remove pump and
clean out openings.
6. Impeller or volute openings
may be plugged or partially
plugged. Remove pump and
clean out.
Pump runs and pumps out
sump but does not stop.
1. Float is stuck in up position.
Be sure float is not hung up
and operates freely in basin.
2. Switch contacts may be stuck;
replace switch.
8
4
0
0
10
20
30
0
10
20
30
40
50
60
0.0
0
2
4
6
8
10
12
1.0
2.0
3.0
Head, meters
Head, feet
Capacity, US GPM
liters/second
cu meters/hr
.30 HP