to assemble the seal by placing the components on the
shaft individually. The notches in the brass collar should
be aligned with the recesses found on each side of the
carbon ring.
7. Press the brass compression ring tightly against the
upper end of the rubber collar. A screwdriver can be used
at several points along its periphery to provide a tight and
even fit. Press with the screwdriver – do not tap. Tapping
on the seal may break the ceramic or carbon insert.
8. With the shaft resting on the wooden block, place the
seal spring and spring retainer on the shaft. Next, place
the impeller and lock washer. Thread the impeller nut to
the shaft and tighten to 96-144 in.-lbs. (8-12 ft. lbs.). Do
not overtighten.
9. Clean the pump body of excess debris. Place a new gas-
ket in the recess of the pump body; ensure that it sits
flush against the gasket surface.
10. Replace the motor and bearing assembly by inserting the
impeller in the pump body and evenly tightening the cap-
screws to 156 in.-lbs. (13 ft. lbs.) using a diagonal tight-
ening pattern.
11. Refer to the WIRING INSTRUCTIONS section in this manual
to properly configure all electrical connections.
12. Following the OPERATIONAL INSTRUCTIONS section in
this manual to 1) check the PH of the system water, 2) to
check the rotation of the pump, and 3) to prime the sys-
tem prior to starting.
REPLACEMENT PROCEDURE
With the bearing assembly and motor removed from the sys-
tem, use the following instructions to facilitate the replacement.
1. Use a strap wrench or rag to prevent the impeller from
turning with one hand and loosen the impeller nut with the
other.
2. Lift the spring retainer and the seal spring from the shaft.
Remove the compression ring from the seal collar by
inserting a small screwdriver underneath the ring and
carefully applying an upward prying force. Remove the
ring, collar and the remaining seal components from the
shaft.
NOTE:
Bell & Gossett seal assemblies consist of an insert
retainer, rubber gasket, ceramic insert, carbon seal ring, rub-
ber collar, brass collar and compression ring, spring and
spring retainer. Each of these components must be replaced
when replacing the mechanical seal. NEVER REPLACE INDI-
VIDUAL COMPONENTS SEPARATELY.
3. Using a clean, lint free rag, remove any debris that may
have accumulated in the seal recess.
4. Place the new retainer in the bearing assembly's seal
recess. Seat the thin rubber gasket in the recess and set
the ceramic insert atop the gasket. The ceramic has a top
side and bottom side. The bottom is identifiable by its
slightly recessed grooves. These grooves should face
downward toward the rubber gasket.
5. Before proceeding, place the shaft end on a wooden
block; the wooden block should push the shaft to its for-
ward-most position (there should not be any end-play in
the shaft).
6. Lubricate the rubber seal collar with soapy water. The
entire
rotating
seal assembly, which includes the carbon
seal ring, rubber collar, brass collar and compression ring,
is to be pushed onto the shaft as one unit. Do not attempt
GENERAL INSTRUCTIONS
1. Keep the pump and motor properly lubricated.
2. If the system is to be exposed to freezing temperatures,
drain the pump.
PERIODIC INSPECTION
Inspect the pump for leaking seals, worn gaskets, and looses
or damaged components. Replace or repair as required.
DEALER SERVICING
If your pump requires further repair, contact your local B&G
Representative. Having the following information at hand will
facilitate your representative's ability to assist you:
1. Complete data from nameplate.
2. Suction and discharge pipe pressure gauge readings.
3. Ampere draw of the motor.
4. A sketch of the pumping system (includes pipes, valves, etc.)
WARNING: HOT WATER HAZARD
Whenever the bearing assembly is removed from the
piping, use a new gasket when re-installing. Failure to fol-
low these instructions could result in serious personal
injury and/or property damage.
ADDITIONAL PUMP REPAIR
Refer to the following manual for further repair instructions for
the Bell & Gossett Pumps:
Coupler & Motor Mount Replacement . . . . .#P06452
. . . . . . . . . . . . . . . . . . . . . . . . . . . . oooo
or #S15900 Rev. D
Booster Pump Service Manual . . . . . . .#HS-105-SM, Rev. 3
YOUR BELL & GOSSETT REPRESENTATIVE IS...
Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.xylem.com/bellgossett
Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries.
© 201
9
Xylem Inc. P76966
F
June 2019
