Bell & Gossett DN0137D Domestic Pump Vacuum & Boiler Feed Unit Series VCMD - Manual (Page 7)

These close coupled vertical centrifugal pumps ar e equipped with
mechanical seals. If system has not been properly cleaned prior to
installation of pump, foreign matter such as dirt, pipe scale, core sand,
etc. may clog the impeller and damage the seal. A strainer is recom-
mended in return line to pump.
Pump must not be operated dr y. Seals
may be damaged if operated without water present.
1. Close inlet line gate valve and operate pump momentarily to
remove as much liquid as possible from pump. Close discharge
line gate valve.
2. Shut-off and lock-out power.
3. Disconnect wiring to motor.
4. Make sure unit is cool enough that pump can be handled safely.
Open receiver drain to remove remaining liquid.
5. Loosen the motor to pump volute fasteners. Assure that pressure
is relieved per caution note.
6. Remove four capscrews (7) holding pump case to motor and lift
motor and impeller out of pump case.
7. Remove pump/motor assembly and place on work bench.
8. Prevent the motor shaft from turning by inserting a large screw-
driver into the screwdriver slot located under the plug on the rear
motor endbell. Back the impeller off (counter clockwise) using a
rectangular bar or other flat tool inserted between the impeller
vanes.
9. Remove the rotating part of the mechanical seal from the end of
the shaft.
10. Remove seal holder (2) with stationary ceramic part of mechanical
seal and cup rubber from the end of the shaft.
11. Remove stationary ceramic part of mechanical seal and cup rub-
ber from recess in seal holder.
12. To install new seal, proceed as follows: Clean recess in seal
holder thoroughly. Orient motor so that conduit opening on motor
is to the left midway between motor lugs. Replace seal holder on
the face of the motor maintaining concentricity with motor face.
Place new ceramic part of seal in the cup rubber over motor shaft
and press firmly into recess of seal holder by hand, making certain
both parts bottom evenly. If assembly cannot be bottomed with
fingers place a wooden or cardboard tube over shaft onto
ceramic and push into place. Using a clean, lint-free cloth, wipe the
mating surfaces of the seal clean of any foreign matter. Moisten the
carbon section of the rotating part of the seal and place onto shaft
to seat against the ceramic. Place seal spring onto shaft.
13. Hold motor shaft as described in #8 and replace the impeller on the
shaft (clockwise rotation) making sure it is tight.
14. Orient motor for pump reassembly with conduit opening to the left.
When mounting the pump case, discharge should be 90˚ to the
right of the conduit opening on motor. Use care to insure tight
gasket fit to prevent water leakage. When replacing pump case, the
wire spacer eye should seat in pump case notch for fit up. If this
does not occur inspect for proper alignment and reassemble.
15. Replace four capscrews (7). Tighten down capscrews evenly to
avoid damage.
16. Reconnect pump bleed line (where applicable) and motor wiring.
17. Close drain and slowly open inlet valves. See warning.
18. Jog to check motor rotation. See caution.
19. Observe operation thru several cycles.
1. Motor
2. Seal Holder
3. Seal
4. Impeller 5. Gasket
6. Case
7. Capscrew
(motor to
volute)
8. Wear Ring
9. Pipe Plug
10. Slinger
2DPF01
W ARNING: EXPLOSIBLE
Do not pr essurize receiver. Isolate receiver during leak test.
Do not plug overflow. Do not restrict vent opening to atmosphere.
Open valves slowly. Failure to follow these instructions could result
in serious injury or death.
7
W ARNING / HIGH VOLTAGE: Disconnect and lock
out power before connecting or servicing unit. Failure to
follow these instructions could result in serious injury or death.
CAUTION / PRESSURIZED SYSTEM: Operating
system may contain very hot water under pressure. Close
inlet and open drains before servicing. When servicing, loosen
scr ews and move components 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 / DO NOT RUN DR Y.
SEAL DAMAGE MAY OCCUR:
Inspect pump seal r egularly for leaks. Replace as required. Failure
to follow these instructions could result in injury or property
damage.
CAUTION / DO NOT REVERSE: Reverse operation
can cause extensive damage to pumps. Jog the motor to
test for direction of rotation. Failure to follow these instructions
could result in injury or property damage.
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PUMP SER VICE INSTRUCTIONS FOR SERIES C35,
MODEL 609PF CENTRIFUGAL PUMPS
CAUTION / HOT SURFACES: Surfaces ar e hot
when system is in operation. Do not touch hot re-
ceiver, let unit cool before servicing. Failure to follow these
instructions could result in injury or property damage.