Bell & Gossett DN0177 B Domestic Pump Centrifugal Pumps Series C35 - Manual (Page 19)

Disassemble the Series C35 model 609PF
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 the fasteners that hold the motor to the pump volute.
2. Make sure that the pressure has been relieved before proceeding.
3. Remove the four capscrews that hold the pump casing to the motor and lift the motor
and impeller out of the pump casing.
4. Remove the pump and motor assembly and place it on a workbench.
5. Hold the top end of the motor shaft with a large screwdriver inserted in the screwdriver
slot in the shaft, and back off the impeller, counter-clockwise, with a rectangular bar or
other flat tool inserted between the vanes of the impeller.
6. Remove the rotating part of the mechanical seal from the end of the shaft.
7. Remove the seal holder with the stationary ceramic part of the mechanical seal and the
cup rubber from the end of the shaft.
8. Remove the stationary ceramic part of the mechanical seal and the cup rubber from
the recess in the seal holder.
Reassembly
Install the mechanical seal (except Series C35 model 609)
1. Thoroughly clean the recess in the bracket.
2. Coat the recess and the rubber portion of the seal with a soap solution.
3. Firmly press the seal into the recess by hand.
Make certain that both parts bottom evenly. If the seal cannot be bottomed with the
fingers, then place a cardboard shipping disc on the ceramic and force the seal into
place with a flat tool.
4. Carefully place the bracket in position on the motor shaft without displacing the
ceramic seal.
5. Secure the bracket to the motor with capscrews.
6. Position the motor vertically with the pump end up.
Do not attempt to assemble the seal and impeller with the shaft in a horizontal
position.
7. Make sure that the carbon of the rotating part of the seal is not loose.
If the carbon is loose, do the following:
a) Hold the carbon in place with grease.
b) Wipe the mating surfaces perfectly clean with a clean, lint-free cloth.
c) Soap the shaft.
d) Push the seal onto the shaft so that the carbon contacts the ceramic seal.
e) If a spacer is required, use grease to adhere the spacer to the bottom of the seal
after the seal has been put on the shaft.
Make sure that the spacer is on the larger diameter of the shaft so that it will not
catch between the shoulder and the impeller.
Install the mechanical seal (Series C35 model 609PF)
1. Thoroughly clean the recess in the seal holder.
Maintenance
Domestic ® Pumps Centrifugal Pumps Series B35, C17, C35 Installation, Operation, and Maintenance Manual 17