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18
PERIODIC SERVICE
GENERAL. - Follow a definite schedule of inspection and servicing.
Keep an
accurate record of operating time, and servicing operations per¬
formed.
Service periods are based on normal service and operating conditions.
For continuous heavy duty, extreme temperatures, or other unusual operating
conditions, service more frequently.
For light duty, periods of little use, etc.,
service periods may be lengthened accordingly.
ENGINE. - Refer to the International Harvester manual for recommended inspec¬
tion and service procedures.
Follow the schedule as it applies to the
particular unit.
AC GENERATOR. - At intervals of 200 hours to 250 hours, to coincide with sched¬
uled engine servicing, check the condition of the generator.
In normal service, the generator slip rings acquire a glossy brown surface.
Do
not attempt to maintain a bright, newly machined appearance.
Normal cleaning
can be performed with a dry, lint free cloth or light canvas.
Slight roughness can
be remedied by lightly sanding with #00 sandpaper.
Blow out all sanding and brush
dust.
On units using the dc generator exciter and separate voltage regulator, service the
dc commutator in the same manner as the slip rings.
See that brushes ride freely in their guides,
and make proper contact.
Replace brushes
when worn to 1/2 inch in length, or if chipped
or otherwise damaged.
Note that it is neces¬
sary to remove each brush spring and plate
before its brush can be removed.
The spring
will be kinked and damaged if the brush is
pulled out past the mounted spring.
Some brushes are tapered at the wire lead
end.
The short side of the taper must
face toward the spring and its plate.
New
brushes are contoured to fit without sanding
but may require
a short run in period of
operation before full load is applied to the
generator.
INSTALL BRUSHES
WITH BEVELLED TOP
SLANTING DOWN
TOWARD SPRING
HOLDER
TO REMOVE BRUSH
SPRING PRESS
SPRING HOLDER
DOWN AND OUT AS
SHOWN IN BROKEN
LINES.
-BRUSH
RING
BRUSH SPRING REMOVAL
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