6
H - FOR INSPECTION AND REPAIR OF
LIQUID END
1. Remove suction head cap screws (215), then set a block
of wood against the fi nished fl ange or back of the suction
head (9) and tap block lightly with a hammer to loosen
suction head. Remove suction head from pump and
place casing gasket (73) in a bucket of water to keep it
soft and pliable.
2. Unscrew the impeller nut (24) by turning
counter-clockwise while holding shaft (6) with a wrench
at drive coupling. Then remove gasket (241). Place
gasket in water.
3. To remove the impeller (2) from the shaft, make three
special cap screws 1/2”-13NC with thread cut 3” long.
Screw these cap screws into the three tapped holes in
the impellers shroud. The cap screws will tighten
against the stuffi ng box head (11) thus forcing the
impeller from the shaft. Lift key (32) from its seat in the
shaft and remove shaft sleeve gasket (14).
4. To remove the pump casing (1), fi rst disconnect
by-pass tube (127) from the casing then remove casing
cap screws (215), casing and stuffi ng box gasket (241)
will lift off the frame (19). Place gasket in water.
5. The stuffi ng box head (11) can be removed after
loosening gland bolts (209) and nuts (210).
6. When necessary to replace wearing rings (27) & (25),
the casing wearing ring (27) can be pressed from the
casing, a small wheel puller can be used to remove the
suction head wearing ring (25).
When pressing in a new casing wearing ring (27), the
face of the wearing ring should be fl ush with the inside
face of the casing (1).
Press in the new suction head wearing ring (25) until it
fi rmly seats against the shoulder of the frame (19).
I - TO INSPECT OR REPLACE BALL
BEARINGS ON SHAFT
1. Dismantle liquid end of pump as described in section “H”
then loosen set screws in pump half of drive coupling
and remove coupling from pump shaft. Also remove key
(32) from shaft.
2. Unscrew bearing cover cap screws (213) remove
bearing cover (37) and gasket (303). Remove shaft
sleeve (14) and slinger (40).
3. Remove adjusting nut clip (204) and unscrew bearing
adjusting nut (66), felt ring (49) and clamping ring (257)
as a unit. Pull the pump shaft (6) out thru the casing end
of the support head.
4. By inspection, determine whether it is necessary to
replace the ball bearings (16) & (18). If so, press on
inner race of the shielded side of the bearing and not
against the outer race of the bearing or the shaft
shoulder. Bearing collars will press off with the bearing.
J - REASSEMBLING OF SHAFT AND
BEARINGS
1. To replace bearings slide bearing (18) over the coupling
end of the shaft (shielded side fi rst) until the inner race
is tight against the shaft shoulder. Then slide bearing
(16) onto impeller end of the shaft, shielded side fi rst,
until the inner race is tight against the shaft shoulder.
Apply fresh grease, of the proper grade, between the
races of each bearing. Also fi ll bearing housing in the
support head about 1/4 full of grease. Never use any of
the old grease.
2. Inspect felt ring (49) in the bearing cover (37) and in the
bearing adjusting nut (66). To replace felt rings remove
clamping rings (257) and insert new felt rings. Press
clamping rings into position.
3. Insert shaft (6) into support head (11) from casing end,
coupling end of shaft fi rst. Push shaft thru support head
until bearing (18) is tight against snap ring (202).
Replace bearing adjusting nut (66), with felt ring and
clamping ring in place. Screw in the adjusting nut until
it is against the outside bearing race. Be sure
the coupling bearing (18) is against the snap ring.
Do
Not
tighten the bearing adjusting nut excessively as this
may ruin the bearings. After completing the above, back
the bearing adjusting nut (66) off the equivalent of
1 to 1½ notches in the bearing adjusting nut face. Lock
the bearing adjusting nut (66) in position with adjusting
nut clip (204). Push the shaft sleeve (14) with slinger
(40) onto the shaft. Replace gasket (73) and bearing
cover (37). Insert cap screws (213) and tighten securely.
Place square key (46) in keyway on coupling end of
pump shaft and press pumphalf of drive coupling onto
shaft. Tighten seal screws.
Figure 4
