Goulds Pumps 3640 - IOM - Manual (Page 71)

Maintenance
Rotor
Allowable runouts of the fully assembled rotor are listed in the Shaft and rotor runout
requirements table.
Table 2: Shaft and rotor runout requirements
Characteristic Requirement
Flexibility factor, L 4 /D 2 >1.9x10 9 mm
(3.0x10 6 in.)
Allowable shaft runout, TIR 40 µm
(0.0015 in.)
Component fit to shaft Clearance
Allowable rotor radial runout, TIR* 90 µm
(0.0035 in.)
*Total indicated runout of impeller hubs and sleeves
Figure 11: Fully assembled rotor
Bearings inspection
Condition of bearings
Do not reuse bearings. The condition of the bearings provides useful information on operating
conditions in the bearing frame.
Checklist
Perform these checks when you inspect the bearings:
• Inspect the bearings for contamination and damage.
• Note any lubricant condition and residue.
• Inspect the ball bearings to see if they are loose, rough, or noisy when you rotate them.
• Investigate any bearing damage to determine the cause. If the cause is not normal wear,
correct the issue before you return the pump to service.
Replacement bearings
Replacement bearings must be the same as, or equivalent to, those listed in this table.
NOTICE:
Thrust bearings must have machined bronze cages (retainers).
Table 3: Model 3640 ball bearing fits
Bearing numbers are based on SKF/MRC designations.
Frame group Nameplate radial Nameplate thrust Bearing housing Shaft turn
bearing bearing bore
S 6407 7407/BECBM 3.9379 (100.022) 1.3785 (35.013)
3.9370 (100.000) 1.3780 (35.002)
M 6309 7309/BECBM 3.9379 (100.022) 1.7722 (45.013)
3.9370 (100.000) 1.7717 (45.002)
Model 3640 Installation, Operation, and Maintenance Manual 69