Bell & Gossett P71396C Series 80-SC Spacer-Coupled Vertical In-Line Centrifugal Pump - Manual (Page 22)

Motor frame size Distance
Collar (DC)
in (mm) Set screw size Set screw torque
in-lbs
D80 IEC 1.076 (27.33) #8–32UNC 20
D90 IEC 1.470 (37.34) #8–32UNC 20
D100 — D112 IEC 1.863 (47.32) #8–32UNC 20
D132 IEC 2.627 (66.73) #10–32UNF 36
D160 IEC 3.686 (93.62) .25–28UNF 87
D180 IEC 3.686 (93.62) .25–28UNF 87
D200 IEC 3.686 (93.62) .25–28UNF 87
D225 IEC 4.762 (120.95) .313–24UNF 165
D250 IEC 4.762 (120.95) .313–24UNF 165
324TC-326TC 4.375 (111.13) .25–28UNF 87
364TC-365TC 4.875 (123.83) .313–24UNF 165
404TC-405TC 6.25 (158.75) .313–24UNF 165
444TC-445TC 7.50 (190.5) .313–24UNF 165
447TC-449TC 7.50 (190.5) .313–24UNF 165
Assemble the coupler
1. Ensure that the coupler halves are clean and burr free. Use sand paper to remove any
burrs and sharp edges within the keyways, collar ring groove, and set screw collar
groove. Rings and keys must slide within their grooves without interference.
2. Install the collar rings in the coupling as matched pairs, with the letter pointing toward
the pump impeller.
The halves of the collar rings are matched and must only be used together. The collar
ring has a letter on each half identifying the set. The letters must match.
The pump coupling uses keys, collar rings, which are split collars, and set screw
collars, which are full rings with set screws, to maintain the motor and pump shaft
position. The pump shaft always has one collar ring. The TC and IEC motors have a set
screw collar set on the motor shaft. An HP type motor uses a split collar ring that fits
into the motor shaft groove.
3. Install the motor set screw collar first for TC or IEC motor types.
4. The impeller weight and seal spring force causes the shaft to move downward;
therefore, half the coupler should be assembled into the pump shaft with collar. Then
the pump shaft must be pulled up and the motor collar ring or motor set screw collar
inserted into the coupling.
5. Install the keys and the other half of the collar ring or rings.
6. Install the second half of the coupler.
7. Insert the coupler hex head bolts and place a lock washer and nut on each bolt.
The bolt heads on opposite sides of the coupling should face in different directions.
Maintenance
20 Series 80-SC Installation, Operation, and Maintenance Manual