AMT jointer - Stubborn screw

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Forum topic by bhacksaw posted 09-29-2014 05:36 PM 1873 views 0 times favorited 4 replies Add to Favorites Watch
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163 posts in 1787 days

09-29-2014 05:36 PM

I bought an AMT 4800 from a craigslist ad knowing the blades had a chip in them. everything else seemed to work fine, the jointer belonged to someone who hadn’t used it in a while because he had come across a larger one. I tried to remove the allen screws so I could get the knives repaired and found that not one of them moved. I hit them with some PB Blaster and all but one eventually gave in. The last one stripped after a few attempts. I used my dremel to cut a flathead channel in it, but – using my biggest screwdriver – I didn’t feel like I was getting enough torque to move it. Any advice? Should I invest in an impact driver? I only paid $50 for the jointer so I don’t want to invest too much to get it going again.

4 replies so far

View Fred Hargis's profile

Fred Hargis

4944 posts in 2455 days

#1 posted 09-29-2014 05:44 PM

I’ve been able to break a fair number of allen bolts loose on old Dewalt saws by using one of the hand impact drivers. These are the those tools that you position, and then wack with a hammer. Mine’s a Lisle, but I think HF has about the same thing for a lot less. You have to have room to put one in position, and I can’t imagine how you would do that on the blade screws.

-- Our village hasn't lost it's idiot, he was elected to congress.

View MrUnix's profile


6574 posts in 2161 days

#2 posted 09-29-2014 05:49 PM

I’d try applying a little heat to help break it loose first. I would also suggest trying to get a pair of vice-grips on the bolt, but from the manual, it doesn’t look like they have enough of a head to grab on to. You can get a cheap impact driver at HF for less than $5 (or the fancy one with a case for under $8).


Edit: One other suggestion.. a flat blade bit in a socket wrench.. gives a lot more leverage than just a screw driver and you can add a cheater bar to get even more.

-- Brad in FL - In Dog I trust... everything else is questionable

View bhacksaw's profile


163 posts in 1787 days

#3 posted 09-29-2014 07:51 PM

Thanks, guys. I think the impact driver might do the trick.

View unbob's profile


808 posts in 1865 days

#4 posted 09-29-2014 08:39 PM

My job is to fix it after you really screw it up. By the time it comes to me it will probably have an “easy out” snapped of in it, then it will cost you.
Here is my advice. If, the fastener will not come out with reasonable pressure using a standard wrench. Use a small flame from a butane mini torch. Heat the head until Bees Wax will melt into it. It may take a few cycle times-heat-apply wax-cool, ect. 99% of the time rusted, green locktited fasteners come out.
All the petrol spray can products are truly worthless compared to Bees Wax, including the trans fluid acetone nonsense.
Bees Wax has a much higher flash point then oils and follows heat. Old time magic!
But, please do not take my advice, folks like me need your money.

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