Iran Tractor ITM 470, Operators Instruction Book

Page: 102 / 122

4
Maintenance and adjustment
95
tery is fully recharged in the workshop.
The recharge should be carried out by a
mains charger at 7 amps.
ALTERNATOR AND FAN BELT
Check the fan and alternator belt
tension every 250 hours.
WARNING
If the lower side panel (safety guard)
is removed or loosened whilst checking
the belt tension, it must be refitted and
secured before restarting the tractor.
Fig. 59 gives a typical illustration of
the alternator/fan belt arrangement; your
tractor may differ slightly in the position-
ing of the adjustment link.
Renew the belt if it is worn or dam-
aged.
To check the deflection, press down
the belt with the thumb at the centre of
the longest free length. With moderate
thumb pressure the correct deflection of
the belt is 10 mm (3/8 in) .
If a belt tension gauge is available, the
correct tension is 355 N (80 lbf), DO NOT
allow the tension to fall below 220 N (50
lbf).
Fig. 59:
To adjust the belt tension:
1. Loosen the alternator pivot bolts (1)
and the adjustment link bolt (2).
2. Change the position of the alternator
to give the correct tension. Tighten the
three bolts.
3. Recheck the belt tension to ensure that
it is still correct.
NOTE
If a new belt is fitted, check/adjust
the tension again after 25 hours of op-
eration.
HEADLIGHTS
Headlight adjustment
To adjust the headlights, screw the
three screws (Fig. 60) in or out as re-
quired, this will deflect the beam up, down
or sideways.
Fig. 60: Head light adjustment.
To adjust the beam:
1. Position the tractor facing a wall or
screen, 2m (6 ft) away (Fig. 61).
2. Mark a point on the wall or screen by
sighting down the hood centre line.
3. Draw a vertical line (1) through the
point.
4. Draw a horizontal line (2) through the