The running temperature for a bearing assembly depends on many factors such as speed, bearing
loads, ambient air temperature, and condition of bearings. Temperatures higher than the human hand
can tolerate are very satisfactory for good bearing operation and should not cause alarm.
For a given speed and loading, the bearing housing temperature will stabilize at some temperature, usu-
ally below 93°C | 200ºF, which will be the normal temperature for that installation. Higher temperatures
than this normal temperature, without any change in speed or loading, can mean a lubrication difficulty or
the approach of a bearing failure.
5.6.4 To disassemble the "J" bearing
For the purpose of these instructions, assume the JC liquid end has been disassembled, including suc-
tion disc (182), suction disc liner (100B), impeller (101), casing (100), hub disc (184), stuffing box compo-
nents, and shaft sleeve (126).
1.
Pull pump coupling half or sheave from drive end of shaft.
2.
Remove radial bearing slinger (123C) from shaft.
3.
Remove jam nuts from adjusting studs (356A) which fasten bearing frame (228) and thrust bearing
housing (134A). Carefully pull the shaft (122), bearings, and thrust bearing housing (134A) from the
drive end of bearing frame (228). Support both ends of the shaft assembly to prevent seal and bear-
ing damage.
4.
Detach thrust bearing snap ring (361) from thrust bearing housing (134A). Slide housing over thrust
bearing.
NOTICE:
See illustrations for specific thrust bearing configuration.
5.
Remove thrust bearing locknut (136) and lockwasher (382).
6.
Press or pull radial bearing (168C) from shaft (122). Apply pulling force to inside bearing race only.
7.
Press or pull thrust bearing arrangement from shaft (122). For double row ball thrust bearing
(112C), apply pulling force to inside race only. For two-bearing thrust arrangement, apply pulling
force to inside race of thrust bearing (112D). The thrust bearing (112D), thrust bearing collar (237),
and radial bearing (112C) will be removed.
8.
Do not remove radial bearing retainer (119B) from bearing frame (228). A factory press fit insures a
permanent installation.
5.6.5 To assemble the "J" bearing
1.
The shaft (122), thrust bearing housing (134A) and bearings must be clean and free of burrs.
2.
To assemble thrust bearing arrangement:
a) Double row ball thrust bearing: (1J-4J)
i.
Heat thrust bearing (112C) in 82°C | 180º F oil bath.
ii.
Slide thrust bearing (112C) onto shaft (122) firmly against shaft shoulder.
iii.
Install lockwasher (382) and locknut (136) before bearing cools. When bearing cools to
room temperature, retighten locknut and secure lockwasher tang.
b) Separate thrust (112C) and radial (112D) bearings on thrust end (5J):
i.
Heat thrust bearing (112D) in 82°C | 180º F oil bath and install on shaft (122) firmly against
shaft shoulder.
ii.
Heat thrust bearing collar (237) in oil bath and install shaft against inner thrust bearing inner
race.
iii.
Heat radial bearing (112C) in oil bath and install on shaft with inner race against thrust collar
(237).
5.6 Maintenance of Bearings
34
Model JC Installation, Operation and Maintenance Instructions
