Hatz 4H50TIC - 8.2.7 Tensioning the poly v belt

Step Activity
1 Spray the entire area with a suitable cold cleaner according to
the manufacturer's instructions and then clean off with a water
jet. Work first against the direction of flow of the cooling air and
then in the direction of flow.
2 Identify the cause of the oiling and seal the leak.
8.2.7 Tensioning the poly v belt
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
▪ Regularly check poly v belts for wear. Replace the poly v
belt immediately when the ribbed profile (inside of the belt)
is worn or broken off.
▪ The cause of running noises for the poly v belt is mostly that
the pretension on the belt is too low.
▪ A too low belt pretension causes early wear of the poly v
belt. Regularly check the belt tension, in case of doubt re-
tension the poly v belt.
▪ The vibration frequency is decisive for adjustment of the belt
tension. The torque values are only a guide value.
Pretension
force
(belt)
Torque
(belt tensioner)
Frequency
(frequency me-
ter)
New belt 480 N (+ 50 N) 80 Nm (+ 10 Nm) 210 Hz (+ 10 Hz)
Belt after serv-
ice
250 N (+ 30 N) 70 Nm (+ 10 Nm) 150 Hz (+ 10 Hz)
Minimum ten-
sion
170 N 125 Hz
4H50TIC Maintenance
HATZ
Operator's Manual 67