Goulds Pumps 3393 - IOM - Manual (Page 81)

Maintenance
Check the shaft surface for damage. Remove any burrs. Replace the shaft if it shows fretting or
gouging or is damaged beyond reasonable repair.
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
Allowable shaft runout, TIR* 0.05 mm (0.0020 in.)
Component fit to shaft Clearance
Allowable rotor radial runout, TIR* 0.10 mm (0.0040 in.)
*Total indicated runout of impeller hubs and sleeves
Bearings inspection
Condition of bearings
Do not reuse bearings. The condition of the old bearings provides useful information on
operating conditions in the bearing frame.
Checklist
Perform these checks when you inspect the old 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 3393 ball bearing fits
Pump Size Radial Bearing Thrust Bearing Bearing Housing Shaft turn
Bore
2.5x4-8 6408 7408 BCBM 4.3321 in. / 4.3307 1.5755 in. / 1.5749
in. 110.035 mm / in. 40.018 mm /
110.00 mm 40.002 mm
4x5-10 6409 7409 BCBM 1.7258 in. / 4.7244 1.7724 in. / 1.7717
in. 120.035 mm / in. 45.018 mm /
120.00 mm 45.002 mm
5x6-11 6311 7311 BECBM 4.7258 in. / 4.7244 2.1662 in. / 2.1654
in. 120.035 mm / in. 55.021 mm /
120.00 mm 55.002 mm
6x8-13 6214 7214 BECBM 4.9228 in. / 4.9213 2.7567 in. / 2.7560
in. 125.040 mm / in 70.020 mm /
125.006 mm 70.002 mm
Bearing Housings
Perform these checks when you inspect the bearing housings:
• Check that the bearing housings are very clean, with no burrs.
• Remove all loose and foreign material.
• Check the bearing housing bores against the values in the Ball bearing fits table.
• Repair or replace housings as necessary.
Replace the casing and diffuser wear rings
Check for obvious damage and excessive clearance and if necessary replace the casing and
diffuser wear rings. The casing and diffuser wear rings (103) are held in place by a press fit and
Loctite® 635.
Model 3393 Installation, Operation, and Maintenance Manual 79