Inspect the condition and adjustment of alternator belts
and fan drive belts.
Inspect all drive belts for wear and replace if they show
any signs of wear.
If one belt in a set requires replacement, always install a
new matched set of belts. Never replace just the worn
belt. If only the worn belt of a matched set is replaced,
the new belt will carry more of a load than the belts not
replaced, as it will not be stretched as much as the older
belts. The additional load on the new belt could cause it
to break and all the belts will fall in rapid succession.
If belts are too loose, the belts vibrate and cause
unnecessary wear on the bets and pulleys.
If belts are too tight, unnecessary stresses are placed
upon the pulley bearings and belts which might shorten
the life of both.
Inspect the condition and adjustment of alternator
belts and fan drive belts.
To check the belt tension, apply 45 Newtons (10
Ibs of force midway between the pulleys.
Correctly adjusted belts will deflect approximately
10 mm (3/8 inch).
If a Burroughs gauge is used, the correct tension is 355
N (80 lbs). If the tension is 220 N (50 lbs.) or below,
To adjust drive belts, loosen alternator pivot
fasteners (1) and adjusting bracket fasteners (2).
Adjust the alternator position in or out to obtain the
correct adjustment. Tighten fasteners (1) and (2).
Check belt tension again to ensure correct
If new belts are installed, check belt adjustment
again after 20 hours of engine operation. Replace
belts in matched sets only.
Every 250 Service Hours or 3 Months