Goulds Pumps API 3171 - IOM - Manual (Page 51)

• Inspect bearing shell (134) bore according to the dimensions in the Bearing fits and tolerances -
Thrust bearing fits table. Replace if dimensions exceed these values.
• Replace the lower grease seal (133) at every overhaul.
• Visually inspect for cracks and pits. Pay particular attention to the snap ring groove.
Bearing fits and tolerances
This table references the bearing fits and tolerances according to ISO 286 (ANSI/ABMA Standard 7) in
inches (millimeters).
Table 5: Steady bearing tolerances
Descript
ion
Bearing ID (pressed into
place)
Housing bore Running clearance (1/2
diametrical clearance)
S/ST M/MT L S/ST M/MT L S/ST M/MT L
Carbon 1.132–
1.134
(28.753–
28.804)
1.633–
1.635
(41.478–
41.529)
2.258–
2.260
(57.353–
57.404)
1.621–
1.623
(41.173–
41.224)
2.121–
2.123
(53.873–
53.924)
2.994–
2.996
(76.048–
76.098)
0.0055–
0.0035
(0.140–
0.089)
0.006–
0.004
(0.152–
0.102)
0.0065–
0.004
(0.165–
0.102)
Bronze 1.129–
1.131
(28.677–
28.727)
1.629–
1.631
41.377–
41.427
2.256–
2.258
(57.302–
57.353)
1.621–
1.623
(41.173–
41.224)
2.121–
2.123
(53.873–
53.924)
2.994–
2.996
(76.048–
76.098)
0.004–
0.002
(0.102–
1.051)
0.004–
0.002
(0.102–
1.051)
0.0055–
0.003
(0.140–
0.076)
Fluted
elastomer
1.126–
1.130
(28.600–
28.702)
1.627–
1.632
(41.326–
41.453)
2.253–
2.257
(57.226–
57.328)
1.621–
1.623
(41.173–
41.224)
2.121–
2.123
(53.873–
53.924)
2.994–
2.996
(76.048–
76.098)
0.0035–
0.0005
(0.089–
0.013)
0.0045–
0.001
(0.114–
0.025)
0.005–
0.004
(0.127–
0.102)
Rulon 1.132–
1.134
(28.753–
28.804)
1.633–
1.635
(41.478–
41.529)
2.258–
2.260
(57.353–
57.404)
- - - 0.0055–
0.0035
(0.140–
0.089)
0.006–
0.004
(0.152–
0.102)
0.0065–
0.004
(0.165–
0.102)
Casing
collar
1.183–
1.190
(30.048–
30.226)
1.678–
1.685
(42.621–
42.799)
2.299–
2.306
(58.395–
58.472)
1.811–
1.816
(45.999–
46.126)
2.243–
2.245
(56.972–
57.023)
3.243–
3.245
(82.372–
82.423)
0.0335–
0.029
(0.851–
0.737)
0.031–
0.0265
(0.787–
0.673)
0.029–
0.0245
(0.737–
0.622)
Table 6: 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).
Maintenance
Model API 3171 Installation, Operation, and Maintenance Manual 49