5.8. V-belts The tension of the V-belts should be checked after every 2,000 hours of operation. 1) Change the V-belts if necessary If in the case of a multiple belt drive, wear or differing tensions are found, always replace the complete set of belts. 2) Checking condition Check V-belts for cracks, oil, overheating and wear. 3) Testing by hand The tension is correct if the V-belts can be pressed in by about the thickness of the V-belt. (no more midway between the belt pulleys) A more precise check of the V-belt tension is possible only by using a V-belt tension tester. 4) Measuring tension ① Lower indicator arm (1) into the scale.
z Apply tester to belt at a point midway between two pulleys so that edge of contact surface (2) is flush with the V- belt. 1 z Slowly depress pad (3) until the spring can be heard to disengage. This will cause the indicator to move If pressure is maintained after the upwards. EA6O6011 spring has disengaged a false reading will be obtained! ② Reading of tension z Read of the tensioning force of the belt at the point where the top surface of the indicator arm (1) 3 intersects with the scale. z Before taking readings make ensure that the indicator arm remains in its position. 2 EA6O6012 Maintenance of Major Components - 147 -