19. Unbolt and remove seal housing (159) from bearing frame. (228 or 228A).
20. Unbolt and remove thrust bearing end cover (109 or 109A). On J frame thrust bearing, cover is not
used. Remove retaining ring (361E).
21. Remove stub shaft assembly from bearing frame.
22. Remove thrust bearing locknut (136). (J frame does not have locknut).
23. Remove ball bearing (112 or 1r2A and 168A) using a suitable puller or press. Care must be taken to
prevent damage to bearings. Do not use a hammer to drive shaft through bearings. Protect bear-
ings from contamination.
24. Remove wave washer (259) from bearing frame. (J frame does not have wave washer).
7.2 Inspection and overhaul
1.
O-rings: lnspect and replace if damaged.
2.
Shafts: Check shafts for runout to be sure they are not bent. Bearing seats, retaining ring grooves,
keyways, surfaces under oil seals, and surface under mechanical seal should be in good condition.
Replace if faces are worn, scarred or cracked, or if elastomeric bellows is damaged.
3.
Thrust washer: Inspect and replace if worn. The back thrust washer (546) is nominal 0.8mm | 0.03"
thick, replace if worn to less than 0.5mm | 0.02".
4.
Intermediate and discharge head bearings: Check for excessive wear in carbon bushings. Replace
as necessary.
5.
Oil seal: Replace if worn or damaged.
6.
Diffuser: Rabbet fits should be checked for foreign materials or damage.
7.
General: All parts should be clean and free of burrs before assembly. This is especially important at
O-ring grooves, threads, and bearing areas.
7.3 Reassembly of power end
Begin reassembly with the bearing frame.
Refer to instructions for the proper reassembly of individual bearing frames. See
for identification of bearing frame.
J Frame
1.
Install ball bearing (112) on stub shaft (380) using a driving sleeve or bearing press.
2.
Lightly oil the bearing housing bore and outer race of the bearing. Install stub shaft assembly. This
is a sliding fit when started properly; do not tap into place.
3.
Replace retaining ring (361E) in bearing frame with tapered side of ring away from bearing.
4.
Replace coupling hub (233) and key.
7.4 S Frame
1.
Clean the frame (228) and bearing end cover
(109) and install the grease seal (333) with the lip out.
2.
The S frame uses angular contact (duplex) bearings mounted in the face-to-face configuration (thin
edges of bearing outer race together). Install the bearings (112) on the stub shaft (380) so the thick
outer race of the first bearing goes on first and thick outer race of the second bearing goes on last.
Install the bearings using a driving sleeve or a bearing press. Drive inner race of bearing only.
3.
Thread the bearing locknut (136) on stub shaft (380) and tighten firmly.
4.
Place wave washer (529) in the bottom of the bearing frame (228).
After lightly oiling the bearing housing bore and bearing outer races, install the stub shaft assembly.
This is a sliding fit; do not tap in place.
5.
Install the bearing end cover (109) and gasket (360) and tighten bearing cap bolts (370N) evenly.
The bearing cap should be installed with the grease relief fitting (113) at the bottom.
7.2 Inspection and overhaul
Model 3935 Installation, Operation and Maintenance Instructions
19
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