Hobart 9OC24S Operation Manual page 293

GENERATOR DIVISION
HOBART BROTHERS COMPANY
OPERATION, MAINTENANCE, AND OVERHAUL MAN UAL, TM-240A
NOTE:
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
New bearings must be heated to 100 deg. C. (212 deg. F.) prior to
installation. Time may be saved if the bearings are placed in a
thermostatically control led oven approximate ly 20 minutes prior to
scheduled assembly. Set the thermostat at 100 deg. C.
(1) Make certain the stator housing is blocked and cannot roll. Make certain the
rotor shaft is clean.
Apply a thin coating of oil to the bearing seats.
NOTE: (a) Before removing bearings from oven, remember that the larger
bearing goes on the front (drive) end of the shaft and the
smaller bearing goes on the rear (exciter) end. Also remember
that the snap ring of a bearing goes on FIRST, toward the
windings.
(b) Position the two generator rotor-to-exciter leads in the shaft
keyway so the rear bearing will slide OVER them.
(2) Use HEAVY LEATHER GLOVES to remove bearings from oven and install them
on rotor shaft. When properly heated, they will slide easily into place with
little or no forcing.
G. Reassembly
(1)
(2)
(3)
(4)
(5)
act 30/73
Allow bearings to cool to room temperature before installing housings.
Use a hoist and a strong V-belt looped over each end of the shaft to position
the rotor as shown in Figure 10.
Lift the drive end of the rotor to a position about even with the center of the
stator.
Extend a steel pipe into the stator housing and onto the exciter end of the
rotor shaft as shown in Figure 9.
Lift the exciter end with the pipe. Guide
and pull the rotor into the stator.
Connect a hoist to front bearing bracket (16, Fig. 7). Clean and lubricate
the bearing seat in the housing hub and lubricate the bearing outer race.
Position the bracket on the shaft and bearing. Use cap screws which are longer
than those used for housing attachment to pull the housing onto the bearing.
Remove long screws when they "bottom" and use regular size, slotted attaching
screws to complete installation and secure bracket to stator.
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