14
E-2) Impeller and Volute Service:
E-2.1) Disassembly and Inspection:
To clean out the volute (11), or clean out or replace impeller
(6), disconnect power, remove cap screws (2) then vertically
lift motor assembly from the pump body (11). Clean out
the volute, if necessary, clean and examine impeller (6) for
pitting or wear, replace if required. To remove Impeller (6),
remove cap screw (8) and washer (8A). The impeller is
keyed onto the shaft with a square key (7) and to remove,
pull impeller straight off the shaft using a wheel puller if
required. Inspect o-ring (9) and replace if cut or damaged.
Before reinstallation, check the motor shaft and impeller bore
for damage.
E-2.2) Reassembly:
To install impeller (6), apply a thin film of oil to motor shaft
and slide impeller straight onto shaft, keeping keyways
lined up. Drive key (7) into keyway. Thread cap screw (8)
and washer (8A) into shaft and torque to 45 ft. lbs. Rotate
impeller to check for binding. Place o-ring (9) on seal plate
pilot diameter lining up holes and install impeller and motor
assembly onto volute (11). Loctite cap screws (2), insert
into volute and motor assembly and torque to 35 ft. lbs.
Check for free rotation of motor and impeller.
E-3) Outer Shaft Seal Service:
CAUTION ! - Handle seal parts with extreme care.
DO NOT scratch or mar lapped surfaces.
E-3.1) Disassembly and Inspection:
To expose outer shaft seal (4) for examination, remove
Impeller and Volute per Section E-2.1. Set motor assembly
(1) in the inverted position to prevent loss of oil. Remove
snap ring from motor shaft, then retaining ring (5), spring
(4C) and rotating member (4B) from shaft, See Figure
6. Examine all seal parts and especially contact faces.
Inspect seal for signs of wear such as uneven wear pattern
on stationary members, chips and scratches on either seal
face.
DO NOT
interchange seal components, replace the
entire shaft seal (4). If replacing seal, remove stationary
(4A) from mounting plate by prying out with flat screw
driver.
E-3.2) Reassembly:
Lightly oil
(DO NOT use grease)
outer surface of stationary
member (4A). Press stationary member (4A) firmly into
mounting plate using a seal pusher but the seal pusher is
to come in contact with seal face (See Fig. 7).
Make sure the stationary member is in straight and that
the rubber ring is not out of it’s groove. Lightly oil
(DO NOT
use grease)
shaft and inner surface of bellows on rotating
member (4B) see Figure 8. With lapped surface of rotating
member (4B) facing inward toward stationary member (4A),
slide rotating member (4B) onto shaft using a seal pusher,
until lapped faces of (4A) and (4B) are together. (See Fig.
8).
IMPORTANT ! - It is extremely important to keep
seal faces clean during assembly. dirt particles
lodged between these faces will cause the seal
to leak.
Place spring (4C) over shaft and in place on rotating
member (4B), making sure it is seated on retainer and not
cocked or resting on bellows tail. Slide retaining ring (5)
over shaft and let rest on spring (4C). Replace snap ring
onto motor shaft. Inspect gasket (9) and replace if cut or
damaged. Assemble impeller and volute as outlined in
paragraph E-2.2.
FIGURE 8
Rotating Member (4B)
Bullet
Motor
Seal Pusher
Stationary
FIGURE 7
Stationary Member (4A) Pol-
ished Face Out
Motor Mounting Plate
Seal Pusher
FIGURE 6
