Onan MJA Series Service Manual page 118

116 REVOLVING ARMATURE GENERATOR
2. Remove the endbell cover and band.
3. Remove the brush springs (Fig 5. A).
4. Loosen the thru-armature-stud nut in the center of the rear bearing.
5. Remove the thru-generator-stud nuts on the endbell.
6. Slide the endbell, brush rig, and frame off as one assembly. He
careful not to drag the frame on the armature.
7. Remove the serews holding the blower baffle to the engine-tc1-gen­
erator adapter and remove the baffle. '
8. Slide the armature and blower assembly off the stud. To loosen
the assembly from the crankshaft, tap the threaded end of the stud
several times with a soft hammer.
NOTE: If the above procedure doesn't loosen the armature assem­
bly, tap down wards on the outboard end of the armature
shaft, rotate it 1/2 .turn and repeat. Don't hit the commu­
tator, collector rings or bearing.
9. If necessary to remove field coils, remove the pole shoes by re­
moving the capscrews holding each to the frame.
5.5 ASSEMBLY, GENERA TOR
1.
Reinstall any poleshoes and field coils removed.
.2. Install the armature and blower assembly and install the stud nut.
S. Check for armature run-out (Fig 5. J).
Run~out
should be less
than
.012". -'
Excessive run-out may be caused by
dirt or a nick on the taper of either
the rotor or crankshaft. If not, cor ­
rect by tapping the high side of the
shaft near the ball bearing. Don't
hit the ball bearing, commutator, or
collector rings.
4.
Install the blower baffle and secure
with screws.
5.
Install the bearing stop on the ball
bearing.
FIG 5. J - CHECKING ARM­
ATURE RUNNOUT