Bell & Gossett DN0177 B Domestic Pump Centrifugal Pumps Series C35 - Manual (Page 17)

Drain the pump
WARNING:
Always disconnect and lock out power to the driver before you perform any installation or
maintenance tasks. Failure to disconnect and lock out driver power will result in serious
physical injury.
CAUTION:
Allow all system and pump components to cool before you handle them to prevent
physical injury.
1. Close the pump isolation valve or system return line valve or inlet line gate valve.
2. Operate the pump momentarily in order to discharge as much water as possible.
3. Close the pump discharge valve or discharge line gate valve.
4. Shut off and lock out the power.
5. If the pump is a Series C35 model 609PF, disconnect the wiring to the motor.
6. Make sure that the unit is cool enough so that the pump can be handled safely.
7. Open the drain in order to remove the remaining liquid.
8. Carefully remove the pump drain plug and the bleed line.
Do not proceed with the disassembly until the pump has completely drained.
Disassemble the Series B35 pump
CAUTION:
Pressurized device. The system may contain very hot water. Close the inlet and open the
drains before servicing the unit. Loosen screws and move components in order to make
sure that pressure is relieved before you remove the screws. Keep the drains open while
you service the unit.
1. Loosen both the discharge connection and the fasteners that hold the suction housing
to the pump volute.
2. Make sure that the pressure has been relieved before proceeding.
3. Remove the loosened hardware.
4. Remove the pump and motor assembly and place it on a workbench.
5. Remove the suction housing capscrews and separate the pump and motor assembly
from the suction housing.
Note that the diffuser should separate from the suction housing in order to allow
removal of the pump and motor assembly.
6. Remove the propeller, propeller stem, and diffuser from the assembly:
If... Then...
The motor shaft is
threaded
1. Remove the propeller locknut.
2. Remove the propeller and propeller stem as an assembly with the diffuser.
3. If you are installing a new propeller, remove the propeller setscrews and
separate the propeller from the stem.
The motor shaft is
keyed
1. Remove the propeller setscrews.
2. Remove the propeller.
3. Remove the diffuser.
4. Unscrew the propeller stem.
7. Remove the capscrews that hold the motor bracket and pump volute together.
Maintenance
Domestic ® Pumps Centrifugal Pumps Series B35, C17, C35 Installation, Operation, and Maintenance Manual 15