pulley fit on motor shaft - force it on?

[birchy]

It should be tight but not need twatting on with a hammer. Deburr the keyway and give the shaft a light rub with some wet & dry. It'll probably fit ok then.

[Web Goblin]

Depending on the fit it has been machined to it might require a percussion adjuster. Colour in the shaft with a black marker, if you havent got any blue, then try to fit the pulley. Hopefully you will see where it is binding ie like the key is too high maybe. If its tight all round it might just be the fit. Whack the pulley in the oven for 10 minutes then drop it on.