JS SERIES PUMPS
MR−03955
FM
APPROVED
MAINTENANCE AND REPAIR
PAGE C − 10
2. Connect the motor cable leads to the control
box.
Do not
apply power to the motor at this
time.
3. Submerge the motor assembly so that both
hose connections are covered. Apply 14−15
psi pressure maximum to
both
air hoses.
In the following steps
do not
apply
power
for more than 10 seconds
; otherwise, the
unlubricated seal will overheat and may
burn.
4. Briefly apply power to the motor, and check for
air bubbles. If air bubbles appear, shut off
power, then apply again. If air bubbles persist,
the seal(s) are leaking.
5. Disassemble the seal(s), and find and correct
the cause of the leak.
6. Re-run the test after corrective action has been
taken.
7. After the seals have been tested, remove the air
hoses. Lubricate a new O-ring, and install and
tighten the screw plug in the top of the motor
housing. The lower screw plug will be used in
LUBRICATION
.
Installing Impeller
References are to FIGURE C−1.
1. Check the impeller (5) for broken vanes,
cracks, or excessive wear. Replace as neces-
sary.
2. Oil the end of the motor shaft and the keyway.
Install the impeller key (6) in the shaft keyway.
Position the impeller (5) on the shaft, and en-
gage the key in the impeller keyway.Press the
impeller onto the shaft until fully seated.
The threads of the impeller screw (10) and
its mating surfaces
must
be lubricated to
reduce friction and prevent corrosion.
3. Lubricate the threads of the impeller screw (10)
and its mating surfaces with SAE 10W 30 oil. In-
stall the impeller screw. Torque the impeller
screw as described in
Installing Volute
Casing
, after the casing is installed.
Installing Volute Casing
1. Use a suitable lifting device to lower the motor
assembly into the volute casing, and secure it
with the screws (13).
2. Insert a wood block through the pump dis-
charge opening and block impeller rotation.
Reach through the pump suction opening with
a wrench, and torque the impeller screw (10) to
40 ft. lbs. (480 in. lbs. or 5,5 m. kg.). Remove the
wood block from the discharge opening.
3. If the guide shoe (32) and rubber seal (31) were
removed, position the seal in the guide shoe,
and secure the guide shoe to the volute casing
with the hardware (41).
Impeller Clearance
NOTE
Impeller clearance should always be adjusted
when the volute casing or impeller have been re-
moved from the pump.
1. Use a feeler gauge to measure the clearance
between the bottom of the impeller (5) and the
volute casing. Loosen the screws (13), and
tighten or loosen the adjusting screws in an al-
ternating sequence to set the impeller clear-
ance between 0.020 and 0.035 inches (0,5 and
0,9 mm) at all points.
3. After the impeller clearance has been set, fully
tighten the screws (13) securing the volute cas-
ing to the motor assembly.
Final Assembly
1. If the hose connector (32) was removed, install
a new O-ring (30), and secure the connector to
the volute casing with the hardware (36).
