Wayne JCU50 Operating Instructions And Parts Manual Download Page 7

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be done to ensure proper draining
and priming.

3. Place rotating shaft seal member in

position on impeller and press into
place. Take care not to press against
polished seal surface.

4. Position impeller on shaft and tighten

securely (Figure 15).

5. Secure diffuser to seal plate using the

two cap screws. Be sure the screws
are orientated on a horizontal line as
described in Step 2.

6. Carefully position pump housing

(volute) gasket over the diffuser onto
the seal plate. In all convertible appli-
cations the seal ring must also be
positioned on the diffuser. In all shal-
low well applications care must be
taken that the o-ring is clean and
properly positioned on the venturi.
Cleaning and positioning makes a
good seal inside the diffuser when
assembled.

7. Assemble the pump housing (volute)

to the motor using the four cap
screws. Be sure the pump housing
(volute) gasket is positioned correctly
and tighten the screws securely.

NOTE:

Shaft must rotate freely and

motor end cap should be secured
before operation.

Maintenance

(Cont’d)

NOTE:

Once a bladder is leaking or bro-

ken, the bladder cannot be repaired. The
tank must be replaced.

LUBRICATION

The bearing used in the pumps are life-
time lubricated at the factory and require
no additional lubrication.

PRECHARGED TANK

Some air is lost through the bladder in
any tank. To prevent tank failure, check
the tank precharge on a yearly basis.

1. Open a faucet nearest the tank and

allow all water to drain from the
tank.

2. Measure the tank precharge at the

valve stem using a tire gauge.

3. If necessary, adjust the precharge

with an air pump 28 - 30 psi on 1/2,
3/4 and 1 HP pumps.

REMOVING OLD SHAFT SEAL

Turn disconnect
switch to “off” posi-

tion.

1. Open a faucet nearest the tank and

allow all water to drain from the
tank.

2. Remove the four cap screws holding

the pump housing (volute) to the
motor (Figure 12).

3. Separate the pump housing (volute)

from the motor to expose the dif-
fuser and the seal plate.

4. Remove the two cap screws and dif-

fuser from the seal plate to expose
the impeller.

5. Remove the small end cap on the

end of the motor opposite the
impeller.

6. With a large screwdriver or

adjustable wrench, keep the shaft
from rotating and remove the
impeller with hand (standard right

JCU50

Operating Instructions and Parts Manual

Seal
Plate

Seal
Seat

Figure 15 - Motor Shaft

hand thread). Be sure to hold onto
the cast iron seal plate when remov-
ing the impeller from the shaft.

7. Remove the seal plate.

8. Pry the rotating shaft seal member

from the impeller (Figure 13).

9. Push or pry the ceramic seat free

from the seal plate (Figure 13).

10. Remove loose particles from

impeller hub and seal plate.

INSTALLING NEW SHAFT SEAL

Before handling
shaft seal parts

wipe hands clean. Dirt or grease can
damage the seal.

1. Wet the inside of the seal cavity on

seal plate and the rubber cup
enclosing the new ceramic seat with
cooking oil. Be careful not to
scratch the ceramic surface of the
seal seat and push seat enclosed in
rubber into seal cavity on seal plate.
Use a cardboard washer to protect
polished surface when pushing
against ceramic seat with any
object. Be sure to remove cardboard
washer.

2. Carefully slip seal plate over shaft so

as not to disturb seal position in seal
plate. The seal plate must be orientat-
ed during assembly so that the two
holes are on a horizontal line across
the motor shaft and the (4) locating
pins on the back of the seal plate line
up with the tabs on the motor hous-
ing (Figure 14). This placement should

Figure 14 - Seal Plate Replacement

Screw Holes

Motor
Shaft

Motor

Impeller

Seal
Plate

Seal Facing Must

Be Clean For

Proper Seal

Figure 13 - Removing Shaft Seal &
Ceramic Seat

Seal
Plate

Ceramic
Seat