Goulds Pumps 3910 11th ed. - IOM - Manual (Page 37)

SHAFT (122)
1. Check bearing fits. If any are outside the tolerance
shown in Tables 5 or 5A, replace the shaft (Fig. 24).
2. Check shaft surface for damage, especially in areas
indicated by arrows in Fig. 24. Replace if damaged
beyond reasonable repair.
3. Check shaft straightness. Use “V” blocks or balance
rollers to support the shaft on bearing fit areas.
Replace shaft if runout exceeds 0.03 mm (.001 in.)
NOTE: Do NOT use shaft centers for runout check as
they may have been damaged when removing bearings
or impeller.
3910-1
1th IOM 5/08
37
Fig. 24
Table 5
Model 3910 Bearing Fits & Tolerances (SI Units)
According to ISO 286 (ANSI/ABMA Standard 7)
Location Description
Group and Dimensions (mm)
SA SX MX, LA XLX
Radial
(Inboard)
Shaft O.D.
50.013 60.015 65.015 90.018
50.002 60.002 65.002 90.003
Interference
0.002 0.002 0.002 0.003
0.025 0.030 0.030 0.038
Bearing I.D.
49.988 59.985 64.985 89.980
50.000 60.000 65.000 90.000
Frame I.D.
90.000 110.000 120.000 160.000
90.022 110.022 120.022 160.025
Clearance
0.000 0.000 0.000 0.000
0.037 0.037 0.037 0.050
Bearing O.D.
90.000 110.000 120.000 160.000
89.985 110.022 119.985 159.975
Thrust
(Outboard)
Shaft O.D.
50.013 60.015 60.015 85.018
50.002 60.002 60.002 85.003
Interference
0.002 0.002 0.002 0.003
0.025 0.030 0.030 0.038
Bearing I.D.
49.998 59.985 59.985 84.980
50.000 60.000 60.000 85.000
Frame I.D.
110.000 130.000 130.000 180.000
110.022 130.025 130.025 180.025
Clearance
0.000 0.000 0.000 0.000
0.037 0.043 0.043 0.050
Bearing O.D.
110.000 130.000 130.000 180.000
109.985 129.982 129.982 179.975
6