CARE AND MAINTENANCE 7
MHL380 D 7.55
7.9.5 Checking V-belt / ribbed V-belt
h Replace as described in chapter 7.8.3
Maintenance and inspection plan.
Danger of injury due to rotating
parts
• V-ribbed belts should be checked
and tightened only when the die-
sel engine is stopped.
• Secure the engine against being
started without authorization.
In an emergency: Administer first
aid, seek treatment from a doctor.
We recommend using a V-ribbed belt tension
measuring instrument to check the V-belt ten-
sion.
Follow the manufacturer’s operating instructions
when carrying out the test.
Checking without a tension measuring
device
Press down on the V-ribbed belt with your
thumb at the centre of the longest free length
and measure the sag of the belt.
When medium thumb pressure of approx.
45 N (about 4.5 kg) is applied, the V-ribbed
belt sag should equal 13 mm.
If a V-ribbed belt exhibits tears or if it is con-
taminated with oil, coolant, grease etc., it must
be replaced.
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