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Page Title:
FAN AND ALTERNATOR BELT ADJUSTMENT |
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 If on the other hand it is obvious
9.
that the viscous fan clutch did not engage
and increase the fan speed, the clutch can
be considered defective due to "low fan
speed at operating temperature".
F i n a l l y , a movement of the fan
h.
blade in excess of l/4", exclusive of
fan blade deflection, usually means a
mechanical failure.
4-15A. FAN AND ALTERNATOR BELT ADJUSTMENT.
The adjustment of the alternator drive
belt should be checked periodically and
if found to be excessively
adjusted
Too tight adjusted
tight or loose.
belts cause early bearing failure in
Belts that are too
the alternator.
loose cause engine overheating and
low battery charge.
Check belt tension by applying
finger pressure (approximately 25 lbs.
Figure 4-29. Alternator Belt Adjustment
f o r c e ) t o p o i n t "A" shown in figure
The belt should deflect l/2 to
4-19.
3/4 inch under the pressure.
4-16.
BRAKE SYSTEM MAINTENANCE
Loosen the adjusting bolt and the
b.
4-17.
PEDAL CHECK AND FREE TRAVEL
two mounting bolts shown in figure 4-29.
ADJUSTMENT.
The following checks
should be made at each 50-hour maint-
Move alternator away from engine
C.
enance interval and appropriate ad-
to tighten the belt, or toward engine
justments made when necessary.
When correct
to loosen belt tension.
tension is obtained by the method des-
a.
Depress each pedal (brake and
cribed in step a., tighten the adjust-
inching) and hold under pressure for
ing bolt (4 foot/pounds) and the
at least ten seconds.
Pedal must be
mounting bolts (7 foot/pounds).
solid, not spongy feeling, and no
drift or leak-down should be evident.
CAUTION
b.
Hold a ruler against the floor
When tightening belt tension, apply
board so that the pedal released height
pressure against the stator laminations
can be measured as shown in figure 4-30.
between the end frames and not against
either end frame.
When adjusting for
C.
Push pedal down by hand until
deflection, pull alternator by hand.
resistance is felt in the master cyl-
Exercise caution
Do not use a pry bar.
inder.
This initial travel should be
when adjusting belts.
Belts adjusted
no more or less than l/8 inch.
too loose will result in belt wear and
high engine temperature due to belt
d.
Adjust free travel by means of
slippage.
the push rod nut shown in figure 4-30.
4-20
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