Main drive belt

The main drive belt on our classic di is sqeeking especially first thing in the morning when cold. (like myself) The noise seems to go away as the day progresses.

Would this be a sign to replace the belt ?

If so what does this involve

Thanks Ken

 

You actually have two belts on the machine. One is a thin belt and the other is a wide belt.

The thin belt goes from the main drive motor to the gearbox. This belt is tensioned by moving the main drive motor. We tension the belts by soundwave and this belt is tensioned to 71hz.

The thicker belt goes from the gearbox to the impression cylinder. It is tensioned by and idler pulley in the sideframe. It is tensioned to 77hz.

It is critical you get the thin belt on parallel to the gearbox, which means the motor has to be squared and not skewed. If so the belt will eithet come off or you will start to have imaging issues due to vibration.

I rate the job as moderately difficult if you have not done it before, but not impossible with the correct tools. Tension is important or you will have imaging issues due to harmonic vibration from loose or overly tightened belts.

 

Thanks for the answer

wow sounds complicated - will need to get someone with right equiptment - would the squeeking indicate replacement needed soon?

Ken

 

The squeaking probably means the belt is loose. You may be able to get away with it just being re-tensioned and not have to replace it. The belts are made to last.

The trick is finding which belt is loose.