Hotpoint w/mch belt comes off

rick laid this down on his screen :

Multi-vee belts are normally driven and drive multi-vee pulleys, I have never seen one drive a smooth pulley. I have seen the flat back of the belt, pass around a smooth pulley, such as a tensioner pulley.

Something seems to not be right. Was the original pulley on the drum smooth?

Ditto on my ancient gas tumble dryer.

Tim

Does it have a Stirling engine motor?

:-)

Yes small motor pulley is multi-vee the main drum is just a flat plastic pulley ..... was the same of the old drum.

There is no tensioner or any adjustment on Motor or drum, the relationship is fixed. It does say that drum belt is fixed tension and non-adjustable.

I looked for a grub screw or similar on motor pulley ... but pulley seem fixed onto shaft.

Its back on and done 3 more full wash cycles and stayed on ... but it does not run in centre of drum pulley.

There's a picture here. Can't see detail on drum pulley.

That's probably why, in a Youtube video, it's so easy to put the belt back on.

Paul

It happens that rick formulated :

So the multi-vee's, on the inside of the belt, are driving a flat pulley?

Which suggests something is axially out of alignment, if it is running to one side. I think I'm right in suggesting that flat pulley have a slight convex curve, to make the belt run to the centre.

rick submitted this idea :

It was maybe pressed on and pressed not quite far enough/ too far.

No ... I put a set square on it - its flat

I will fit a new belt - if that still does not ride true unsure of next step ..... if it were coming off at rear I could put packer behind motor fixing bolts and move it out slightly.

It happens that rick formulated :

Have you tried fitting the belt so it rotates the opposite way? Does it work its way off, on the other side of the pulley? If it does, it would suggest it is a faulty belt.