Goulds Pumps CV 3171 - IOM User Manual
Page 40
40
CV 3171 IOM 05/11
Table 3
Steady Bearing Tolerances
Bearing ID
(pressed in place)
Housing Bore
Running Clearance
(1/2 diametrical clearance)
Bearing
Material
S/ST
M/MT
L
S/ST
M/MT
L
S/ST
M/MT
L
Carbon
1.132/1.134 1.633/1.635 2.258/2.260 1.620/1.622 2.120/2.122 2.993/2.995 0.0055/0.0035 0.006/0.004 0.0065/0.004
Bronze
1.129/1.131 1.629/1.631 2.256/2.258 1.620/1.622 2.120/2.122 2.993/2.995
0.004/0.002
0.004/0.002 0.0055/0.003
Fluted
Elastomer
1.126/1.130 1.627/1.632 2.253/2.257 1.620/1.622 2.120/2.122 2.993/2.995 0.0035/0.0005 0.0045/0.001 0.005/0.004
Rulon
1.132/1.134 1.633/1.635 2.258/2.260
0.0055/0.0035 0.006/0.004 0.0065/0.004
S/ST
M/MT
L
S/ST
M/MT
L
S/ST
M/MT
L
Casing
Collar
1.183/1.190 1.678/1.685 2.299/2.306 1.811/1.813 2.243/2.245 3.243/3.245 0.0335/0.029 0.031/0.0265 0.029/0.0245
NOTE: Bearing ID prior to pressing into the housing will be slightly larger than ID after it is pressed in place.
Shaft
1. Check the thrust bearing fit. If it is outside the
tolerance in Table 4, replace the shaft (122)
(Figure 32).
Table 4
Thrust Bearing Fits
Group
Shaft OD
Shell ID
S/ST
0.9848/0.9844
2.4416/2.4409
M/MT
1.5755/1.5749
3.5442/3.5433
L
2.1660/2.1655
4.7253/4.7240
2. Check the steady bearing areas. If more than
0.002” of wear exists, replace the shaft.
3. Check the shaft straightness. If any of the
values exceed the values in Table 5, replace
the shaft.
Table 5
Shaft Runout Tolerances
Group
Coupling
End
Shaft Body
Impeller
End
All
0.002”
0.0005”/ft.
0.005”
Bearing Shell
1. Inspect bearing shell (134) bore per the
dimensions in Table 4 and replace if dimensions
exceed values.
2. Remove lower grease seal (133). It is always
recommended that the seal be replaced at
every overhaul.
3. Visually inspect for cracks and pits. Pay
particular attention to the snap ring groove.
Ball Bearing
Ball bearing (112) should be inspected for
contamination and damage. The condition of the
bearing will provide useful information on operating
conditions in the bearing shell. Lubricant condition
should be noted. Bearing damage should be
investigated to determine cause. If cause is not
normal wear, it should be corrected before the
pump is returned to service.
DO NOT REUSE BEARINGS.
Motor Support
Inspect motor support (240) for any cracks or
excessive corrosion damage. Replace if any of
these conditions exist.
Figure 32