Xylem IM126R02 E-Z Prime Jet Pump Shallow Well Jet Pump - Manual (Page 5)

5
Installation Tip
The pressure switch supplied with 1/2 hp and 3/4 hp
Jet Pump is preset to 20-40 psi (pump turns on when
system pressure drops to 20 psi — pump turns off when
system pressure reaches 40 psi). The 1 hp and 1-1/2 hp
Jet Pumps are preset at 30-50 psi. If adjustments are
necessary to fit your system needs, follow the adjustment
instructions on the inside cover of the pressure switch.
If you are using a precharged pressure tank with your
system, be sure that the empty tank pressure is 1 psi lower
than the cut-in pressure setting of your pressure switch
(see Section 4 in this manual).
Section 3
Maintenance
Lubrication
1. The pump requires no lubrication.
2. For the electric motor, refer to instructions provided
by the motor manufacturer.
Seal Removal
1. Disconnect electrical service to the pump.
2. Relieve system pressure by opening a faucet or
drain valve until water stops flowing.
3. Disconnect pressure switch tubing at the barbed
fitting on the pump case. If tubing does not slide
off barbed fitting easily, cut it as close to the fitting
as possible.
4. Remove the four cap screws which hold down the
pump seal plate and motor to the pump case. Pip-
ing need not be disturbed.
5. Remove the pumping assembly, as one piece, (mo-
tor, seal plate, diffuser, and impeller) by carefully
prying them apart from the pump case. Exercise
care so as not to damage the impeller.
6. Remove the diffuser from the seal plate, exposing
the impeller.
7. Insert a regular slotted screwdriver into the slot in
the motor shaft.
8. While holding the motor shaft with the screwdriver,
unscrew the impeller by turning counter clockwise.
9. Slide rotating part of seal assembly from shaft (as
shown in Figure 3. Separate seal plate from motor.
10. Remove stationary part of seal assembly (including
rubber seal boot) from seal plate.
New Seal Installation
1. Clean polished surface of stationary seal with a
clean cloth.
2. Wet the outer edge of the rubber seal boot with a
soap solution.
3. Insert rubber seal boot and ceramic seal (polished
side exposed) into seal plate. Make a cardboard
washer to cover the ceramic seal surface to be
used while pressing seal into position. Cardboard
washer is used to avoid scratching ceramic surface.
Discard cardboard washer after ceramic seal instal-
lation (see Figure 3).
4. Reposition seal plate onto motor and slide rotating
seal assembly onto motor shaft with carbon sealing
face first until rubber end ring slides over shaft
shoulder.
5. Screw impeller clockwise onto motor shaft using
screwdriver in shaft end slot to hold the shaft.
6. Reattach diffuser to seal plate and carefully repo-
sition the pumping assembly to the pump case.
Attach with the four cap screws through motor
bracket to case.
7. Connect the pressure tubing by pressing on to
barb fitting on pump case until tubing shoulders
against stop edge of fitting. If tubing was cut off,
carefully remove excess tubing from barb fitting
with a knife, taking care not to scratch the fitting.
Motor Removal
1. Follow steps 1-10 of “Seal Removal” in this section.
Motor Replacement
1. Follow steps 1-7 of “New Seal Installation” in this
section.
Figure 3: Seal assembly.
CASE
BOLT
MOTOR SHAFT
SEAL PLATE
O-RING
SEAL
BOOT
IMPELLER
DIFFUSER
O-RING
CERAMIC SEAL
ROTATING SEAL