2. Inspection and Adjustment (2) V-belt tension check When there is not enough tension in the V-belt, the V-belt will slip making it impossible for the alternator to generate power and cooling water pump and cooling an will not work causing the engine to overheat. f Check and adjust the V-belt tension (deflection) in the following manner. [NOTICE] Be especially careful not to splash engine oil on the V-belt, because it will cause slipping, stretching and aging of the belt. 1) Press the V-belt with your thumb [approx. 98N(10kgf)] at the middle of the V-belt span to check the tension (deflection).
Available positions to check and adjust the V-belt tension (deflection) are at the A, B or C direction as shown in the illustration right. You may choose a position whichever you can easily carry out the check and adjustment on the machine unit. z "New V-belt" refers to a V-belt, which has been used less than 5 minutes on a running engine. z "Used V-belt" refers to a V-belt, which has been used on a running engine for 5 minutes or more. The specified deflection to be measured at each position should be as follows. (Unit: mm) 2) If necessary, adjust the V-belt tension (deflection). To adjust the V-belt tension, loosen the set bolt and move the alternator to tighten the V-belt.
After replacing with a new V-belt and adjusting it, run the engine for 5 minutes and readjust the deflection to the value in the table above. 3) After replacing with a new V-belt and adjusting it, run the engine for 5 minutes and readjust the deflection to the value in the table above. 4) Visually check the V-belt for cracks, oiliness or wear. If any, replace the V-belt with new one. 27 Direction A B C For used V-belt 10 14 7 10 9 13 For new V-belt 8 12 5 8 7 11