25
Drive belt. Check
The belt drives both the circulation pump and the
generator. A belt that is too loose can result in slip-
page, poor cooling and poor charging. A belt that is
too tight can damage the bearings in the circulation
pump and damage the generator.
Check the tension of the belt regularly. Adjust if nec-
essary. Check that the belt is not cracked or dam-
aged. Replace a worn belt. Keep a spare belt on-
board.
Drive belt. Adjusting and replacing
WARNING! Always turn the engine off before
starting maintenance work.
IMPORTANT! Tighten screw (1) to 50–60 Nm.
Adjusting
Check and adjust as necessary after operating the
engine when the belts are warm.
It should be possible to depress a correctly ten-
sioned belt approx. 10 mm between the pulleys with
your thumb. To adjust slacken off screws (1 and 2)
and if necessary screw (3) on the 2010 and 2020.
Tension belt, adjust tension and tighten screws.
Check the tension.
Replacing
To replace the belt slacken off screws (1 and 2) and if
necessary screw (3) on the 2010 and 2020. Press the
generator in towards the cylinder block so that the
belt can be removed. Clean off the pulley grooves. In-
stall the new belt. Adjust as above. Check belt ten-
sion again after a few hours’ operation.
1
2
3
MD2010, MD2020
MD2030, MD2040
2
1
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