Tuning up used Jet JBS-14MW

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Forum topic by abehil posted 12-01-2015 12:43 AM 1157 views 0 times favorited 0 replies Add to Favorites Watch
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104 posts in 1363 days

12-01-2015 12:43 AM

Topic tags/keywords: bandsaw tool wood

I bought it on CL a couple days ago. I want to give it a good checkup before starting to use it.
The former owner took reasonably good care of it. It came with a kreg fence, urethane tires and had just recently had the tension bracket replaced. It wasn’t a rust bucket like a lot of used stuff.

The thrust bearing and blocks weren’t positioned correctly. The upper thrust bearing was pushing on the blade and the lower guide blocks were not even being used as they were as far apart as possible.

The top of the upper wheel comes very close to touching the wheel housing in order to get the blade to center. It looks like the center bolt on that wheel is new so I’m wondering if he replaced the bearing and tightened the wheel too far back when reinstalling it. Also, the lower wheel is a little farther forward and the blade doesn’t quite center so maybe the upper wheel is causing that.
I’ve never taken a wheel off so this will be interesting.

Guide blocks:
The lower blocks are metallic because my magnet sticks to them. The upper blocks are not metal. I don’t know why there would be too different materials and since I’ve never actually seen Cool Blocks I don’t know if the top ones are the cool ones or just OEM. Any opinions would be helpful.

Thrust bearings:
One bearing is fine, the other spins without creaking but it only spins a few revolutions before it stops. Not sure if it’s worn out yet or not. Do those bearings come in singles or just pairs?

Knocking sound:
A knocking sound every wheel revolution. I located it as coming from the upper pulley wheel which is loose enough to wiggle. The wobble makes a knock in the same place as the pulley changes orientation. The armature is straight and the pulley itself doesn’t seem bent.

This BS is metal/wood and has a three pulley system. The belt on the motor side seems to be ok. The belt on the upper part, on the knocking pulley, has a couple splits showing so it might need replacing.
I have a link belt on my table saw. Can a link belt be used on these 3 pulley systems as well? I would only probably replace the one belt for now either way.

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