![]() ![]() My model was made in the mid 1970s and I don’t think it had ever been completely taken apart. The whole thing needed some serious cleaning, oiling, and greasing anyway. ![]() Since I had to tear down half of the headstock to get the motor out to work on the sheave, I decided to go the rest of the way and replace the upper Poly V belt as well. The floating motor sheave is number 119 in the diagram: A better version of this is available at Here is the stuck open floating motor sheave, in need of a cleaning and repair. After roughly 45 years, the sheave got gummed up with old oil, grease, dirt, and sawdust. I had replacement belts on-hand from Jacob Anderson Shopsmith Repair, so I started watching his excellent videos to figure out how to tear down the headstock and replace the belts, I quickly realized what my actual problem was: The floating motor sheave was stuck open, so when I turned the Shopsmith up to higher speeds, the motor sheave didn’t close in relation to control sheave opening up, so the drive belt had too much slack and wasn’t getting any traction. ![]() I’d also been having some problems cutting heavy stock on the bandsaw attachment, so I figured it was time to change the old belts. Two weeks ago while using the lathe on my Shopsmith Mark V, I heard what sounded like the belt slipping. ![]()
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