Goulds Pumps CV 3171 - IOM User Manual

Page 40

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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 

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