Member postings for Paul Olson

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Thread: Harrison M300 or M250 pulley/belts problem

16/10/2019 08:00:04

Sorry I am a bit late late to this party. I don’t know if you have already sorted this. I have just finished stripping and rebuilding my M300. The roll pins only stop the washer/cap from rotating on the shaft, meaning that as you tightened the screw you are only pushing the pulley on rather than twisting/binding it on the key. On mine I just removed the screw, then the whole assembly came off. The roll pins remained in the cap / washer. You may need a puller to get the pulley off if the shaft is dinged from previous abuse, or if there is corrosion. Mine pulled off easily by hand.

Having said all of that, your pulley looks a bit on the large side, which may be why you are struggling getting the belts on. My belts easily passed the cap screw. Is the top speed of a T300 lower than an M300? Here is a picture showing the pulley clearance on my machine. Sorry for the poor picture, this is a crop from a picture of something else.

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