MR−03955
JS SERIES PUMPS
FM
APPROVED
PAGE C − 9
MAINTENANCE AND REPAIR
tainer in the rotating element. Align the retainer
with the step in the shaft, and secure with the
drive screw.
Installing Lower Seal Assembly
References are to FIGURES C−2 and C−3.
1. Lubricate the motor shaft and the seal cavity of
the lower bearing housing (213).
2. Unwrap the seal components. Check that the
seal faces are clean and undamaged. If neces-
sary to clean, use a clean tissue and wipe in a
concentric pattern.
3. Place a clean, lint-free cloth over the stationary
seat seal face, and install the stationary seat
and O-ring in the seal housing.
4. Install the seal clamp (261) in the seal housing,
and secure it with the locking ring (264).
5. Slide the assembled seal parts and seal hous-
ing (257) over the shaft, and use a soft-faced
mallet to tap the seal housing into place until ful-
ly seated against the lower bearing housing
(213).
Use caution
not to damage the O-ring
(251). Secure the seal housing to the stator
housing with the screws (254).
6. Install the rotating element flush against the sta-
tionary seat. Lightly lubricate and install the ro-
tating element O-ring.
7. Install the seal spring retainer against the rotat-
ing element O-ring. Install the seal spring, and
engage it in the groove in the rotating element.
8. Install the spring retaining ring (265). Compress
the spring until the retaining ring is even with the
chamfer on the shaft, and secure it with the re-
taining screws (266).
NOTE
See
Seal Testing
before assembling the remaining
pump end components.
9. After the pump is fully assembled, lubricate the
seal housing as indicated in
LUBRICATION
at
the end of this section.
SEAL TESTING
The seal assembly should be tested under pres-
sure and submerged in water before the pump end
is assembled.
NOTE
The compressed air used in testing must be
dry
.
Moist air in the motor housing will cause the mois-
ture switch inside the motor to trip.
There are two screw plugs along the flange of the
motor housing, and a third in the body of the hous-
ing; the third (upper) plug is used in testing only.
Test 1:
1. Remove either of the two screw plugs and O-
rings (268 and 269) along the flange of the mo-
tor housing. Thread an air hose adaptor into the
hole, and install an air hose.
2. Remove the screw plug and O-ring in the top of
the motor housing. Thread an air hose adaptor
into the hole, and install an air hose.
3. Submerge the pump in water and apply 14−15
psi maximum to the
lower
air hose. Check for
air bubbles. If air bubbles appear, the seal(s)
are leaking. Disassemble the seal(s), and find
and correct the cause of the leak.
4. Re-run the test after corrective action has been
taken.
Test 2:
1. Install air hoses as in Test 1.
This test is conducted with the pump un-
der power. Refer to the appropriate wir-
ing diagram in this section and observe
all precautions outlined in
PUMP SAFE-
TY − SECTION A when connecting the
motor cable to the control box; other-
wise, the pump could be damaged, and
personnel exposed to injury or death.
