Bell & Gossett P71396C Series 80-SC Spacer-Coupled Vertical In-Line Centrifugal Pump - Manual (Page 21)

Motor collar ring setting
CAUTION:
The motor collar ring must be set on the motor shaft at the correct position and set screws
torqued to the proper value.
The motor collar ring must be set on the motor shaft at a specified distance for both TC
motors and IEC motors to insure the pump impeller is in the proper position during pump
operation. The distance to set the collar (DC) is measured from the motor mounting
surface to the surface of the collar ring closest to the motor.
1
2
3
Figure 4: Motor collar ring setting for TC motor
1
2
3
Figure 5: Motor collar ring setting for IEC motor
1. Motor mounting surface
2. Collar ring
3. DC
The collar ring is held in position on the motor shaft with set screws. These set screws
must be tightened to the proper torque to ensure that the collar does not slip as a result
of pump rotor weight and pump hydraulic thrust.
Place a small amount of Loctite 222MS on each setscrew before installing them into the
motor collar.
Table 1: Collar setting distance
This table describes the collar setting distance, set screw size, and set screw torque for TC
and IEC motors.
Motor frame size Distance
Collar (DC)
in (mm) Set screw size Set screw torque
in-lbs
182TC — 184TC 2.121 (53.87) #8–32UNC 20
213TC — 215TC 2.597 (65.96) #10–32UNF 36
254TC — 256TC 3.227 (81.97) #10–32UNF 36
284TC — 286TC 3.735 (94.87) .25–28UNF 87
324TSC — 365TSC 2.855 (72.52) .25–28UNF 87
Maintenance
Series 80-SC Installation, Operation, and Maintenance Manual 19