8. Inspect all pulleys for foreign objects, oil, or
grease in the grooves.
Belt Tension Inspection
NOTE: If engine drive belts require adjustment,
see Group 01 of the
Business Class
®
Trucks
Service Manual
.
Threaded-Adjustment Type
1. Apply the parking brakes, and chock the tires to
prevent the vehicle from moving.
2. Install a belt tension gauge at the center of the
belt’s longest free-span. Check belt tension. See
Table 1 for belt tension specifications.
3. If belt tension is not correct, see Group 01 of the
Business Class
®
Trucks Service Manual
to adjust
belt tension.
Spring-Tension Type
On belts equipped with a spring tensioner, the belt
tension is automatically adjusted. Check that the ten-
sioner is holding tension on the belt by inserting the
end of a breaker bar in the 1/2-inch square hole on
the forward face of the tensioner, and rotating the
tensioner down, away from the belt. When the
breaker bar is slowly released, the tensioner should
return to its original position. If not, see Group 01 of
the
Business Class
®
Trucks Service Manual
for re-
placement instructions.
NOTE: The following engines are provided with
automatic drive belt tensioners: Caterpillar CFE,
Detroit Diesel Series 55, and Dodge Magnum.
The following engines, which appear in
Table 1,
are provided with automatic tensioners for the
fan and alternator belts (and refrigerant com-
pressor for Caterpillar C10/C12): Caterpillar C10
and C12 and Cummins B and C Series.
Drive Belt Tensions
Engine Component
Belt Tension
lbf (kg)
Cummins B and C Series Refrigerant Compressor 100 (45)
Cummins M11
Alternator 105 (48)
Fan 160 (73)
Refrigerant Compressor 90 (41)
Detroit Diesel Series 50
Fan and Alternator 70 (32)
Refrigerant Compressor 95 (43)
Mercedes-Benz OM366LA
Fan and Alternator 160 (73)
Refrigerant Compressor 100 (45) or 140 (64)
*
Air Compressor 50 (23)
*
For a regular V-belt, tighten the belt to 100 lb (45 kg). For a Powerband
®
V-belt, tighten the belt to 140 lb (64 kg).
Table 1, Drive Belt Tensions
Engine01
Business Class Trucks Maintenance Manual, July 199901/2
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