HATZ Diesel 4H50TIC - Manual (Page 68)

Step Activity
2 Loosen the alternator mounting bolt (1) one or two revolutions.
3 Position the belt tensioner (3) with the guiding groove on the
bracket (2).
4 Feed in the hexagon nut (4) of the mounting bolt into the clamp-
ing claw (5). Move the belt tensioner for this.
5 Adjusting the belt tension with a torque wrench:
Place the torque wrench (with dial gage) on the belt tensioner,
lay the counter support on the alternator housing.
6 Tighten the torque wrench (6) until the required torque is
reached.
7 Hold the torque wrench and tighten the alternator mounting bolt
at this position.
8 Checking the belt tension with a frequency meter:
Vibrate the end of the belt between the alternator and fan by
lightly hitting it with the hand.
9 Measure the frequency with a commercially available optical or
acoustic frequency meter by following the meter manufacturer's
instructions.
10 If necessary, retension the belt by using a belt tensioner as de-
scribed above.
8.2.8 Replacing the poly v belts
Safety note
CAUTION
Danger of burns.
There is a danger of burns when working on a hot engine.
▪ Let the engine cool before maintenance.
NOTICE
i
▪ The poly v belt must be replaced after 3000 operating hours
at the latest. If wear is detected, the poly v belt must be im-
mediately replaced.
4H50TIC Maintenance
HATZ Operator's Manual 69