Installation of Rotating Assembly (RA)
Removal of Rotating Assembly (RA)
- 2 -
The following information applies to both cast iron
and stainless steel 5 HP models.
Procee as follows:
1. Loosen set screws in pump shaft coupling.
2. Date co e: 7-93 to present -
Cast iron - rotate discharge clockwise (left hand
threads) while holding pump housing with a strap
wrench. Then, remove the pump housing by rotating
it clockwise with a strap wrench.
Stainless steel - rotate welded discharge/pump
housing clockwise (left hand threads) with a strap
wrench.
Date co e: Prior to 7/93 - Rotate discharge counter -
clockwise (right hand threads).
3. Remove the top diffuser containing the brass or
rulon (maroon) bearing. The top impeller will be
exposed.
4. Grasp the SS shaft sleeve bearing and pull RA
away from the motor. (Care should be taken not to
damage the SS shaft sleeve bearing). If a pair of pli-
ers is needed to grasp the bearing, use some kind of
protective covering around the bearing. On longer
stage pumps, it might be necessary to squirt 3-in-1 oil
into the hole used for the set screw in the pump shaft
coupling - if this is done allow the oil to set overnight.
Then, insert a screwdriver into the suction inlet hole
and pry the pump shaft coupling off the motor shaft:
Warning: Always disconnect the electrical supply
prior to servicing the pump.
Note: If improperly installed, a 1/8” gap will exist
between the bottom plate and diffuser.
at the same time, pull the RA away from the motor.
You may have to apply a back and forth motion to
loosen the coupling from the motor shaft.
1. A) Cast iron mo els - Slide a new o-ring over the
threads on the suction inlet and discharge. Position
it in the groove up against the shoulder and
lubricate the o-ring with a FDA approved lubricant.
Lubricate the threads on the suction inlet and
discharge with Anti-Seize Lubricating Compound
(Part # 41003) or equivalent.
B) Stainless steel mo els - Repeat item 1.A for
the suction inlet.
2. Position the bottom plate of the rotating assembly
against the bottom diffuser. When properly installed,
you will be able to feel a raised hub and a 1/8” diame-
ter pin on the surface opposite the part number.
3. Position the coupling key in the keyway provided in
the motor shaft.
4. Align the keyway in the shaft coupling with the key
in the motor shaft and slide the pump shaft coupling
onto the motor shaft. (Do not tighten set screws in the
coupling at this time.)
5. Cast iron mo els, Rotate the pump housing
counter clockwise (left hand threads) onto the suction
inlet until the pump housing contacts the shoulder on
the suction inlet. Tighten with a strap wrench. Take
care not to pinch the o-ring.
Screw the discharge counter clockwise (left hand
threads) into the pump housing until the discharge
bottoms out against the pump housing. Take care not
to pinch the o-ring.
Stainless steel mo els - Rotate the discharge/pump
housing counter clockwise (left hand threads) onto
the suction inlet until the discharge/pump housing bot-
Motor
Motor
Pump
Housing
Pump
Housing
Discharge
2 Set Screws
Suction Inlet Discharge
Cast Iron Model
Stainless Steel Model
2 Set Screws
Suction Inlet
Bottom Plate
Bottom Diffuser
Pin
Rotating Assembly (RA)
O
