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Blade Elevation mechanism jammed on Craftsman 113.298240 TS

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Forum topic by brtech posted 12-10-2011 11:09 PM 1715 views 0 times favorited 6 replies Add to Favorites Watch
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brtech

903 posts in 2387 days


12-10-2011 11:09 PM

Topic tags/keywords: question tablesaw

Help!

All of a sudden, the blade elevation mechanism jammed on my (older, Emerson built, contractor) TS.
It won’t go up or down at this point. At first it would move in a small range, but doesn’t now. The wheel, it’s shaft, and the worm screw end seem to be fine. There isn’t any sawdust in the worm screw or the elevation gear. I have pulled off the belt, cleaned anything I could get to from the bottom of the saw, and looked for anything that seems out of wack. The tilt works okay. The arbor seems fine. I just can’t get it to go up or down. I had been cutting slots on a new pair of UHMW ZCFs, so I had been running the mechanism all the way up and down several times with no problem until it stopped working.

Lousy timing – just getting ready to build some holiday gifts.

Any suggestions for what is happening or how to fix?


6 replies so far

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brtech

903 posts in 2387 days


#1 posted 12-12-2011 04:57 PM

Hey jocks – any ideas here? It’s a bad time to have to replace this now. Has to be something reasonable I can do to fix it. I can’t see up into the pivot point to see if there is something jammed up there. The shaft end visible from the middle is flush with the casting. Nothing in there.

Anyone taken something like this apart? Looks like a heck of a lot of work. Turn it upside down, take off the sheet metal and …

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syenefarmer

432 posts in 2545 days


#2 posted 12-12-2011 06:37 PM

I know you said you checked for sawdust buildup but did you also check for a wood chip being jammed up somewhere? When was the last time you lubed everything with a dry lube?

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brtech

903 posts in 2387 days


#3 posted 12-12-2011 06:55 PM

Well, there isn’t anything in the shaft, the worm gear or the elevation gear that I can see. What I can’t see is up into the pivot point. The bottom of the casting has the elevation gear. I can see a shaft farther up on the casting that seems to be the pivot, but the part I can see is flush with the casting. There is some kind of strap on the opposite side but it’s hard to see (or get to) anything up there because the side wall of the sheet metal interferes. I’ve tried tilting it around to get a better view, but so far no joy.

It’s been a while since I lubed it :(. I don’t see how to get up into the pivot. I can lube the worm gear and the elevation gear – that’s at the bottom and easy to see. I’ll at least do that and see if it helps anything.

Is it possible to disassemble the worm gear and shaft? If I could disconnect that, I might be able to wack the casting with a block of wood to dislodge something. The worm gear is holding the elevation gear in place, so wacking it without disassembling wouldn’t seem to work.

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Brad Dawson

1 post in 1829 days


#4 posted 12-13-2011 03:07 AM

Does your saw have that spring loaded locking lever above the elevation wheel? The lever is located right up tight under the table top.

-- Brad, Texas, http://www.dawsonbradleydesign.com

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brtech

903 posts in 2387 days


#5 posted 12-13-2011 03:53 AM

Yes, it has the locking lever, but it’s a tilt lock. It seems to work fine, and the tilt mechanism works.

I guess I’ll convince the neighbor to come over and help me turn it upside down to see if we can find out what’s stuck in there.

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brtech

903 posts in 2387 days


#6 posted 12-14-2011 04:33 AM

Success!

Got the neighbor over and we turned the saw upside down. Removed the sheet metal, and pounded the pivot shaft until it moved. That wasn’t it. Turned out to be the drive shaft that connects to the worm gear. Some WD-40, some whacking and a big C wrench and it loosened up. No real explanation for why, but I’ll keep it lubed and hope I don’t have the problem again.

Thanks for the suggestions.

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