5 . MAINTENANCE AND ADJUSTMENTS
5.22
Challenger MT500B EU
WARNING: Do not disconnect any part of the
cooling circuit from the air conditioning sys-
tem. Consult your dealer or agent if a fault
occurs.
5.15 - CHECKING FAN BELT CONDITION
AND TENSION
(Fig. 38)
Examine the “Poly V” fan belt (on a daily basis or whenever
refuelling).
Cross cracks (running across the breadth of the belt) are al-
lowed.
Longitudinal cracks (running along the length of the belt)
which intersect cross cracks are not allowed.
Replace the belt if it is cracked in an unacceptable way,
frayed or if pieces have come off.
5.15.1 - Check belt tension every 400 hours
CAT engines: Adjusting the alternator belts.
The correct deflectionvalue is 10 to 15 mm when pressing
the hand on the belt midway between the fan pulley and
crankshaft pulley.
A new belt may loosen after operating for approximately
half an hour or an hour. Loosen the alternator clamp bolts
in order to adjust the tension.
Firmly retighten the bolts.
The alternator should be checked by the dealer every 1200
hours or once a year.
NOTE: A belt tension gauge can be used.
5.15.1.1 - Replacing
• Trapezoid belts: Loosen the alternator attachment
screws, remove the fan belts, fit the new belts and
tighten while manipulating the alternator. Retighten the
alternator. Check the tension of the belts and adjust if
necessary.
• "Poly V" belt: Fig. 39: Loosen the tensioner to release
the belt. After replacing it, retighten the tensioner.
Checking the tension: Swivel the belt on itself without
draft after taking it at its longest point between the
thumb and index finger. It should not be possible to swiv-
el it more than half a turn.
Fig. 38
Z2-508-05-03
Fig. 39
MT-0391103
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