GENERATOR
Most of the generators used on the
K662
are of the
3
brush, shunt wound type DC generators for
12
volt electrical systems.
Some earlier generators have hinged oiler caps and require lubrication at
regular intervals, although most have sealed bearings which do not require regular servicing.
On all
generators, the brushes and commutator must be checked at specific intervals.
Service generators at
the intervals stated in the following service steps.
Brushes
After each 500 hours of operation, remove thru
bolts and take off end frame to observe condition
of brushes,
sprines and holders.
Replace brushes if
unevenly worn or if worn to less than 112 their
original length
(n'w--about 1" long). 'Replace springs if corroded or if blued or discolored from exces
-
sive heat.
Brush arms and brushes must move freely without tendency to bind
or
cock in holders.
L
I
FIGURE
7
-
4
-
-
TYPICAL DC GENERATOR
(K662)
DISASSEMBLED VIEW
Commutator
Observe condition of the commutator at the same time the brushes are serviced (500 hours).
If
dirty, clean with No. 00 Sandpaper.
Make sure dust is removed after cleaning.
If suriace is grooved,
rough or out of round, remove armature and place in lathe so that commutator can be turned down.
Remove only enough material to make commutator smooth and round. After resurfacing, undercut the
mica insulation 1/32
"
deep.
Finish with No. 00 Sandpaper after undercutting and blow
out all dust.
Lubrication
On generator having the hinged cap oilers, add several drops of SAE 20 weight oil to both caps
(at commutator and drive end frames) after each 200 hours of operation or every fourth oil change
period.
CAUTION:
Do not add too much oil as this may cause overheating of the bearing.
Add only a
few drops at each service period.
Belt Tension
Occasionally check condition
of
belt and also check belt tension.
Belt should be adjusted so that
it deflects about
1/2" when depressed with finger at midpoint on upper span. Too little tension results
in belt slippage and rapid wear of the belt. Excessive tension also causes rapid wear and can damage
generator bearings. Loosen generator mounting bracket and move generator until proper tension is
attained.
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