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Old 05-22-2008, 08:57 PM   #1
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1981 31' Excella II
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set screw on power jack

I can't get the set screw loose on the power jack. Any suggestions?

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Old 05-22-2008, 09:11 PM   #2
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Liquid wrench, WD-40 or similar, followed by tapping on the screw to set up vibrations. Let it soak good, trying it occasionally. May take a day or two to soak in and loosen up.

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Old 05-22-2008, 09:11 PM   #3
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Check this out..Quite a few manual on power jacks..
Excellent tips on grease application, etc.
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Old 05-22-2008, 09:17 PM   #4
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There are a couple of ways to get threads loose.

The most necessary tool is patience.

Try some penetrating oil. Not WD40, get some real penetrating oil. Let it set over night and see if the treads are loose.

You can try heat. Sometimes just heating with a soldering gun and letting it cool a couple of times will break threads loose. The screw and the housing are of different materials, therefore expand and contract at different rates with heating and cooling. Usually this will separate the threads.

Another way threads can be broken free is with impact. If it is an allen head, put an allen wrench in the screw and tap on the wrench, not in the direction to turn the screw, but straight down the length of the screw. A pin punch that fits inside the allen head can also be used.

Sometimes I use all three. Heat, then soak, then a good hit.

The trick is to remove the screw without messing up the screw or the housing.

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Old 05-22-2008, 09:36 PM   #5
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Patience, penetrating oil, and heat. Heat it with a torch, spray with penetrating oil, and wait. Repeat as many times as necessary. If that doesn’t work, your are into the brute force techniques.
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Old 05-22-2008, 10:00 PM   #6
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You can use a little oil of wintergreen or you can mix a little automatic transmission oil and acetone as a penetrant. Mainly, as others have said, give it time to work. Another trick is to take a steel rod or punch the same diameter as the set screw and heat it red hot, then hold it to the set screw and let it transfer heat. this will oftenb do the trick where you don't want to apply a torch directly.
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Old 05-23-2008, 05:22 AM   #7
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Set Screw on Power Jack

If you have already sprayed something else on it this may not work. But Coca Cola is one of the most effective rust removers I've seen. The opening in the jack power head is larger than the top of the jack post. When in place and the set screw is tight, there should be some space between the head and the post. Whatever you use to loosten the rust, try spraying some up between the post and the head and try to soak the portion of the set screw that is in that gap. Good luck! CharlieE
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Old 05-26-2008, 08:38 AM   #8
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1981 31' Excella II
Hendersonville , Tennessee
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Thank you for all your responses. I used the heat/oil/hammer technique and one screw came out the other stripped. Thats when I used just the hammer technique. I think the head softened the screw and I was able to work the jack up and off. It looks like I will have to drill out the one set screw and re-tap the hole. It should not be a problem. Thanks again for your help. Maybe on the next one I'll try the Coca Cola.
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Old 05-26-2008, 08:59 AM   #9
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you might try using an easy-out. it works best if you can drill out as much as possible without cutting the thread.

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