Maintenance
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 3610 ball bearing fits
Bearing numbers are based on SKF/MRC designations.
Pump size
Radial bearing Thrust bearing Bearing
Shaft turn
group
housing bore
S/SX
6309
7309/BECBM
3.9369
1.7722
3.9379
1.7718
M, MX
6312
7312/BECBM
5.1181
2.3628
5.1191
2.3623
L, LX
6313
7313/BECBM
5.5118
2.5597
5.5128
2.5592
XL
6318
7318/BECBM
7.4809
3.5440
7.4820
3.5434
X, XXL, XLX
6320
7320/BECBM
8.4652
3.9377
8.4663
3.9371
XX
6224
7320/BECBM
8.4652
Thrust
Radial
8.4663
3.9377
4.7255
3.9371
7.7249
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 wear parts
Replace the throat bushing
The throat bushing (125) is held in place by a press fit and tack welds.
1. Remove the bushing:
a) Grind out the tack weld.
b) Press the bushing into the seal chamber of the case (100) and head (184) bore.
2. Install the bushing:
a) Thoroughly clean the bushing fit in the seal chamber of the case (100) and head (184).
Model 3610, API Type BB1 API 610 11th Edition Installation, Operation, and Maintenance Manual
77
