AIR VENTING
Upon initial filling of the wet well with the water, air may be trapped in the pump volute. To vent off this air, a
5/32” diameter hole is located in the volute. BE SURE THIS VENT HOLE IS CLEAN AFTER ANY SERVICE
WORK ON PUMP.
REMOVING PUMP CASE AND IMPELLER
In case of wear, damage due to dropping, plugged pump, or replacing a defective motor, the pump volute case and
impeller can be removed in the field.
1. Remove bolts between seal housing flange and volute case. The motor and impeller can now be lifted off as a
unit.
2. If necessary to remove impeller, lay pump on its side. With a screwdriver bend the tabs of the lockwasher
away from the head of the hex head bolt.
3. Loosen and remove the bolt by turning counterclockwise. Since Loctite is used to secure the bolt and is applied
to the shaft/impeller interface, heating of the shaft end to 450° to 500° F will usually be required.
4. Impeller is mounted by a straight fit with driving key. Pry evenly on opposite impeller sides with two large
screwdrivers or small bars behind the impeller.
5. Set motor on end with shaft up after removing impeller so that oil will not drain past the seal.
REPLACING IMPELLER AND PUMP CASE
1. Apply Loctite #680 before assembly, in keyway, in the impeller bore (lower shaft O.D.) and on the threads of
the hex head cap screw.
2. Before placing the impeller on the shaft, be sure the mechanical seal and its spring are in place.
3. Position retaining washer with long pin extension in keyway.
4. Obtain a new lockwasher and flatten two tabs located 180° from the locking projection on the inner edge of the
washer. There should be one flattened tab on each side of the pin extending from the retaining washer.
5. Assemble hex head cap screw and tighten securely.
6. Bend lockwasher tabs up against hex head on the bolt, do not bend up the two tabs flattened of each side of the
pin in the retaining washer.
TROUBLE CHECK LIST
Troubles listed generally pertain to the pump and auxiliary components. Other troubles can occur form a faulty
control box, these will be listed with the control box instruction.
CONDITION PROBABLE CAUSE
Pump runs but does not pump liquid 1. Pump impeller may be air locked, this occasionally occurs
from basin. on a new installation. Start and stop pump several times
to purge air. Be sure air vent hole in volute case is clean.
2. Run additional water into basin so that pump will be submerged deeper
to clear water.
3. If pump is three phase, rotation may be wrong.
4. If pump has been installed for some time and does not pump, it may be
clogged at inlet.
5. Discharge gate valve may be closed.
6. Discharge check valve may be clogged or have a broken clapper or
spring.
7. Discharge head may be too high. Check elevation.
8. If above checks do not locate trouble, motor rotor may be loose on shaft
which allows motor to run but will not run impeller or only at low RPM.
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