Table 4: Thrust bearing fits
Group Shaft OD Shell ID
S/ST 0.9848/0.9844
(25.0139/25.0038)
2.4416/2.4409
(62.0166/61.9989)
M/MT 1.5755/1.5749
(40.0177/40.0025)
3.5442/3.5433
(90.0227/89.9998)
L 2.1660/2.1655
(55.0164/55.0037)
4.7253/4.7240
(120.0226/119.9896)
Shaft runout tolerances
The following shaft runout tolerances apply to all size groups:
• Coupling end: 0.002 in. (0.051 mm)
• Shaft body: 0.0005 in./ft.
• Impeller end: 0.005 in. (0.127 mm)
Reassembly
Assemble the column and support plate
1. If you use the optional stuffing box, then attach the stuffing box (221) to support plate (189) with
bolts (370L).
2. Attach the motor support (240):
If ... Then...
You use the stuffing box Attach the motor support (240) to the stuffing box with bolts (370J).
You do not use the stuffing box Attach the motor support (240) to the support plate (189) with bolts
(370J).
3. Attach the head column (192):
If... Then...
You use the stuffing box Attach the head column (192) to the stuffing box with bolts (370M).
You do not use the stuffing box Attach the head column (192) to the motor support with bolts (370M).
Make sure that the vent holes are closer to the motor support.
Maintenance (Continued)
Model 3171 Installation, Operation, and Maintenance Manual 45
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