Goulds Pumps 3620 - IOM - Manual (Page 70)

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 25 µm
(0.0010 in.)
Component fit to shaft Clearance
Allowable rotor radial runout, TIR* 75 μm
(0.0030 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 3620 ball bearing fits
Bearing numbers are based on SKF/MRC designations.
Pump size Radial bearing Thrust bearing Bearing Shaft turn
group housing bore
S 6309 7309/BECBM 3.9369 1.7722
3.9379 1.7718
68 Model 3620, API Type BB2 Single Stage / ISO 13709 1st/2nd Ed. / API 610 8th-11th Ed. Installation, Operation, and
Maintenance Manual