Press firmly with your finger on the V-belt between the crankshaft pulley and the alternator.
If the tension is correct, the belt should only flex 5mm, the new belt 2mm.
If the belt is tensioned correctly, you should check whether the alternator tension bolt and the pivot bolt nut are well tightened.
V-belt tension is checked between the crankshaft and alternator V-belt pulleys (see arrow).
V-belt tension
Loosen the alternator bracket bolt.
Attach a powerful screwdriver between the engine and the generator from below.
Pull the alternator away from the engine to tension the belt.
At the same time, tighten the alternator bracket adjusting bolt with the other hand.
If the alternator cannot be moved, slightly loosen the pivot bolt.
After tensioning the V-belt, let the engine run for a short time, check the tension, and re-tension if necessary.
V-belt tension is best adjusted from below when the machine is raised on the stands. Loosen the nut (3), in the photo it is shown together with an attached wrench. Adjusting bolt (2) cannot rotate. Take a lever or rod from the on-board tools, move the generator (1) outward, in the direction of the arrow. Tighten the adjusting screw nut.
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