webtrol EZ Series Operating instructions

Stainless SteelCast Iron
Maintenan e & Repair Manual
Cast Iron and Stainless Steel Booster Pump
EZ Series
01/20 Edition
.5 - 3 HP Models

Installation Of Rotating Assembly (RA)
Removal Of Rotating Assembly (RA)
- 2 -
The following information applies to both cast iron
and stainless steel models 1/2 - 3 H .
1. A) Cast iron models - Slide a new o-ring over the
threads on the suction inlet and discharge. osition
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
( art # 41003) or equivalent.
B) Stainless steel models - Repeat item 1.A for
the suction inlet.
2. osition 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. Screw the pump shaft coupling onto the motor
shaft (clockwise direction) until the shaft coupling has
bottomed out against the shoulder on the motor shaft.
To do this, hold the exposed motor shaft at the rear of
the motor and rotate the hex head screw located at
the end of the pump shaft in a clockwise direction
with a 7/16” socket.
4. Cast iron models, 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.
Screw the discharge counter clockwise (left hand
threads) into the pump housing until the discharge
bottoms out against the pump housing.
Pro eed as follows:
1. Date ode: 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 ode: Prior to 7/93 - Rotate discharge counter -
clockwise (right hand threads)
2. Loosen set screw in pump shaft coupling.
3. Remove motor end cap located at the rear of the
motor to expose the motor shaft.
4. Remove the hex head screw located at the end of
the pump shaft by rotating it counter - clockwise. Hold
the end of the exposed motor shaft with a screwdriver
or 7/16” open end wrench to prevent rotation.
5. Remove the top diffuser (brass or rulon bearing)
and SS shaft bearing.
6. To remove the rotating assembly rotate the hex
pump shaft with a 7/16” open end wrench in a count-
er - clockwise direction while preventing the exposed
motor shaft at the rear of the motor from rotating.
Warning: A 316 SS spacer was installed on
pumps with date codes of 4/96 - 6/98.
This spacer must be removed when
replacing the rotating assembly,
otherwise the pump will go into upthrust
and fail immediately!
Warning: Always disconnect the electrical supply
prior to servicing the pump.
Note: The bottom plate must be removed prior to
installing the new rotating assembly.
Note: If improperly installed, a 1/8” gap will exist
between the bottom plate and diffuser.

Me hani al Seal Repla ement
Me hani al Seal Installation
- 3 -
Stainless steel models - Rotate the discharge /
pump housing counter clockwise direction (left hand
threads) onto the suction inlet until the discharge /
pump housing bottom out against the suction inlet.
Tighten with a wrench.
5. Tighten set screw in the pump shaft coupling.
6. Insert a 7/16” socket into the discharge and rotate
the hex head cap screw (clockwise direction) to make
sure that the rotating assembly rotates freely. If the
rotating assembly is hard to turn, repeat the removal
and installation procedures until the rotating assembly
rotates freely.
1. Clean seal cavity, removing all rust and scale.
2. A) Lightly lubricate the rubber seat ring with
mineral oil. Using a 3/4” socket or piece of 3/4”
VC pipe, press ceramic seat firmly and squarely
into the seal cavity. Be sure the seal face is not
damaged during assembly (cracked, scratched, or
chipped) or the seal will leak.
B) Clean polished surface of ceramic seat with a
soft cloth or tissue to remove all dust and grit.
C) Inspect motor shaft to make sure it is clean.
D) To prevent slip-stick lightly lubricate both the
ceramic and carbon seal face with mineral oil.
Do not let oil get on to the motor shaft or the
rubber driving ring of the mechanical seal.
E) For ease of assembly lubricate the driving ring
on the mechanical seal with water. By hand
carefully press the rotating seal assembly onto the
motor shaft. The carbon seal face must contact the
ceramic seal face. The driving ring must seal
against the motor shaft.
3. Use a screwdriver to remove the ceramic seat and
rubber seat ring from the seal cavity as shown. Be
careful not to damage sealing surfaces on the seal
cavity.
1. Follow instructions under “Removal of Rotating
Assembly.”
2. Remove the rotating element of the seal (carbon
ring, seal , and spring) by grasping the element and
pulling/twisting it off the motor shaft.
3. To reassemble the rotating assembly refer to
Installation of Rotating Assembly (RA)

1. After reassembly, rotate the pump shaft. It should
be free enough to be turned by hand. To do this,
insert a 7/16” socket into the discharge and rotate the
hex head cap screw clockwise.
2. If you can turn the shaft with minimum effort, the
booster pump is operable. If you cannot rotate the
pump shaft or feel a drag as you turn the pump shaft,
check the following for improper installation.
A) The coupling on the pump shaft must be
screwed tightly against the shoulder on the motor
shaft.
B) The bottom plate must be installed properly.
See Installation of Rotating Assembly, instruction 2.
C) The pump housing must be firmly tightened
against the shoulder of the suction inlet and
discharge.
1. Measure the length of the motor shaft from the
mounting surface of the motor to the shoulder of the
motor shaft that butts up against the pump shaft cou-
pling. This dimension should be 1.880 + .030.
2. Inspect shaft to make sure it is clean.
3. Slide the water slinger over the shaft, as far back
as possible.
4. Make sure the motor vents are on the bottom,
before fastening the suction inlet and motor support
to the motor with (4) 3/8” bolts. The two 3/8” x 1 1/2”
bolts are used for fastening the motor support.
5. Refer to “Mechanical Seal Installation” and
“Installation Of Rotating Assembly” instructions 1-6.
Installation Of Motor
Final Inspe tion
Removal Of Motor
1. Refer to “Removal of Rotating Assembly” (RA)
2. Refer to “Mechanical Seal Replacement”
instruction 2.
3. Remove the (4) 3/8” bolts that attach the suction
inlet and motor support to the motor.
4. ull the suction inlet and motor support away from
the motor.
Warning: Always disconnect the electrical supply
prior to servicing the pump.
8417 New Hampshire Ave. | St. Louis, MO 63123
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