Bell & Gossett DN0132F Domestic Pump Vented Boiler Feed Units Series CME - Manual (Page 7)

1. Close pump isolation valve or system return line valve.
Operate pump momentarily to discharge as much water as
possible. Close pump discharge valve.
2. Shut-off and lock out power.
3. Make sure unit is cool enough that pump can be handled
safely. Open drain to remove remaining liquid.
4. Carefully remove pump drain plug and bleed line. Wait for
complete drainage.
5. Loosen both the discharge connection and the suction
housing to pump volute fasteners. Assure that pressure is
relieved per caution note.
6. Complete the removal of the above hardware. Remove
pump/motor assembly and place on work bench.
7a. Remove the suction housing capscrews and separate the
pump/motor assembly from the suction housing. Note, the
diffuser should separate from the suction housing to allow
the pump/motor assembly to be removed.
7b. Remove propeller, propeller stem and diffuser from the
assembly as follows:
(1) Threaded Motor Shafts (3Hp and less). Remove pro-
peller lock nut. Remove propeller with propeller stem as
an assembly with the diffuser. To install a new propeller,
remove the propeller set screws and separate from the
stem.
(2) Keyed Motor Shafts (5Hp and larger). Remove propeller
set screws. Remove propeller, remove diffuser, and
unscrew the propeller stem.
8. Remove capscrews holding motor bracket and pump
volute together. Remove motor and bracket assembly
from volute by lifting straight away from volute.
9a. To remove impeller from motor shaft proceed as
follows:
(1) Keyed Shafts. Remove impeller with gear puller or
other means which will not damage impeller or bend
motor shaft.
(2) Threaded Shafts. Hold end of motor shaft opposite
pump with large screwdriver or other suitable tool and
back impeller off with a rectangular bar or other flat
tool inserted between the vanes of the impeller.
9b. Remove rotating part of seal from shaft, being careful not
to break carbon face.
10. Remove capscrews holding motor bracket to motor and
remove bracket.
11. Remove stationary part of seal assembly, being careful
not to chip or break ceramic seal.
12. To install seal proceed as follows:
(1) Clean recess in bracket thoroughly. Coat recess and
“rubber” portion of seat with soap solution. Press seat
into recess firmly by hand making certain both parts
bottom evenly. If seal cannot be bottomed with fingers
place cardboard shipping disc on ceramic and force
into place with tool.
(2) Carefully place bracket in position on motor shaft with-
out displacing ceramic seat and secure bracket to
motor with capscrews.
(3) Place motor vertically with pump end up. Do not
attempt assembly of seal and impeller with shaft
horizontal.
(4) The “carbon” of rotating part of seal should not be
loose. If it is, hold in place with grease. Using clean, lint
free cloth, wipe mating surfaces perfectly clean. Soap
shaft and push seal onto shaft so that carbon with con-
tact ceramic seal. If spacer is required, use grease to
cause spacer to adhere to bottom of seal after seal has
been put on shaft. Be sure spacer is on larger dia-
meter of shaft so that it will not catch between
shoulder and impeller.
13. Place impeller on shaft. Make sure impeller is seated.
14. Reassemble volute to bracket.
15. Install stem over drive pin in impeller eye. Tighten lock nut.
16. Set stem to .004 TIR.
17. Install diffuser.
18. Install propeller and tighten set screws.
19. Using new gasket and noting alignment pin, install
assembly on suction housing.
20. Install suction housing and discharge fasteners and tighten.
PUMP SER VICE INSTRUCTIONS FOR SERIES B35 PUMPS
CAUTION: PRESSURIZED SYSTEM
Operating system may contain very hot water and
steam under pressure. Close inlet and open drains before
servicing. When servicing,
loosen scr ews and move compo-
nents to assure pressure is relieved before r emoving scr ews.
Keep drains open during servicing. Failure to follow these
instructions could result in injury or property damage.
CAUTION: HOT SURFACES
Surfaces ar e hot when system is in operation. Do not
touch hot receiver, let unit cool before servicing. Failure to
follow these instructions could result in serious injury or
death.
W ARNING: HIGH VOLTAGE
Disconnect and lock out power befor e connecting or
servicing unit. Failure to follow these instructions could
result in serious injury or death.
HEAVY DUTY
BALL BEARING MOTOR
WATER SLINGER
MECHANICAL SEAL
STAINLESS STEEL SHAFT
MOTOR BRACKET
PUMP VOLUTE W/WEAR RING
IMPELLER
2DPB01
IMPELLER
AXIAL FLOW PROPELLER
PROPELLER SET SCREW
SUCTION HOUSING
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