Once you have completed all the necessarily steps for a good and safety installation process of your respective belt, what you need to know is the proper way to do it. Here are the main steps you will have to follow:
- Make sure that the tensioning device is in the innermost position.
- Check that the shafts are parallel and the pulleys aligned perpendicular to the belt running axis.
- The running surfaces of the pulleys must be clean and free from grease, soil and dust.
- Before installing, trace small measuring marks at a distance of e.g. 1000 mm (recommendation) on the un-tensioned belt. Use a ball-point pen and mark as accurately as possible! Do not place the measuring distance over the joining area. For short belts or if the control distance on the machine is shorter, choose a shorter measuring mark distance, e.g. 500 mm. The longer the distance between the measuring marks, the higher the tensioning accuracy.
- Install the belt carefully. Lay it first on the small, then on the large pulley. Do not force the belt over pulley edges. Do not use unsuitable tools as screwdrivers, hammers, etc. Special care has to be taken when installing a belt with an aramide traction layer (TF-belts). These belts are especially sensitive to twisting and buckling.
- Tension the flat belt by enlarging the center distance until the distance between the measuring marks has increased by the value of the required (calculated). Example:
Required initial elongation eo = 2.0%
Measuring mark distance of un-tensioned belt: 1000 mm
Measuring mark distance of tensioned belt: 1020 mm
If the initial measuring mark distance of an un-tensioned belt is not 1000 mm as recommended, adapt the tensioning accordingly. For examples see the table below:
Never tension a power transmission belt by guesswork; always observe the calculated initial elongation eo !
- Rotate the belt once or twice by hand. The flat belt must not drift or run off even when the direction of rotation is changed.
- Check the distance of the measuring marks again. If necessary, tension the belt to the required initial elongation.
- Fix the screws of the tensioning device.
- Secure the original protective casing before starting the motor.
- Make sure that the belt data (type, dimensions, quoted initial elongation, date of installation and maintenance instructions are stored near the machine, e.g. in a self-adhesive envelope stuck on the machine.