Belt slipping?

I just acquired a C&P NS 10x15 and am new to letterpress. When I run the press, the belt slips off. The press has a 1HP motor and the belt runs between the wheel and the motor on the right side. It happens at any speed. The belt seems to fit tight enough. It usually happens after it’s been running about 30 seconds. The belt just works its way off the wheel. Any suggestions? Thanks!

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I think it’s called belt dressing. Most hardware or industrial hardware stores should have it. Kinda gooie and dirty, but printing is a dirty job.
BOB

My experience is that if the bun of the motor is not squared up with the wheel, the belt will walk one way or the other - check allignment and good luck with a fun versatile press

Thanks!