Engine Maintenance (Rev. 12/03)
53
BELTS
Belts should be regularly inspected during unit pretrip
inspections for wear, scuffing or cracking. Belt tension
should also be checked during scheduled maintenance
inspections. Belts that are loose will whip and belts that are
too tight put too much strain on the belt fibers and bearings.
Using belt tension gauge, P/N 204-427, is the best method
of checking belts for tightness. Install the belt gauge in the
center of the longest belt span. Press the plunger so the hook
will engage the belt. Make sure the hook is on the face of
the belt, not in a notch. Release the plunger with a quick
motion and without pulling on the belt. Then read the dial.
Use an average of three readings.
NOTE: Do not attempt to remove or install belts without
loosening adjustments. Belts that are installed by prying
over pulleys will fail prematurely due to internal cord
damage.
CAUTION: Do not attempt to adjust belts with the
unit running.
CAUTION: With the unit On-Off switch in the ON
position, the unit may start operation at any time
without prior warning. Switch the unit On-Off
switch to the OFF position before performing main-
tenance or repair procedures.
Model 30 Belt Adjustments
Alternator Belt Adjustment
The alternator belt tension should read 35 on the belt
tension gauge.
1.
Loosen the alternator pivot bolt and the adjusting arm
bolt.
2.
Move the alternator on the adjusting arm slots to adjust
the belt to 35 on the belt tension gauge.
3.
Tighten the adjusting arm bolt and alternator pivot bolt.
Upper and Lower Fan Belt Adjustment
The upper fan belt should read 74 and the lower fan belt
should read 67 on the belt tension gauge.
NOTE: Both the upper and lower fan belts are adjusted at
the same time in one procedure.
NOTE: If a fan belt is loose or damaged, replace the belt
(see Fan Belt Removal and Installation procedure).
1.
Loosen the idler assembly pivot bolts and the idler
adjusting arm bolts.
2.
Push in or pull out on the idler adjusting arm to
“center” the idler assembly between the belts and
balance the tension equally between the upper and
lower belts.
3.
Tighten both idler adjusting arm bolts and both idler
assembly pivot bolts.
NOTE: If the idler assembly binds when moving for
belt adjustment, loosen the upper idler support
bracket mounting bolts to free up the assembly. Check
the main idler retainer nut assembly for proper align-
ment between the nut and the support bracket slots.
Model 30 Fan Belt Replacement
NOTE: Do not attempt to remove or install the belts with-
out loosening the adjustments. Belts that are installed by
prying over pulleys will fail prematurely due to internal
cord damage.
Lower Fan Belt
Removal
1.
Loosen both idler adjusting arm bolts and both idler
pulley assembly bolts.
2.
Push the idler adjusting arm IN. The lower fan belt will
come off the engine pulley. Move the arm OUT far
enough to clear the roadside idler mounting bracket.
Содержание SB-190 30
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