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Old 01-05-2013, 08:37 AM   #1
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Electric jack goes up but not down

Hi all. My recently acquired 1960 Ambassador appears to have the original electric jack. It worked fine when I picked it up, but when I got it home and in place, it decided it only wants to go up. When I try to go down it just clicks.

Anyone have any experience with this?
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Old 01-05-2013, 09:06 AM   #2
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There are several gears in there. This happened to us, and we were able to replace the stripped gear fairly easily. Open the top and look for the stripped gear.
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Old 01-05-2013, 09:09 AM   #3
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Originally Posted by Edge View Post
Hi all. My recently acquired 1960 Ambassador appears to have the original electric jack. It worked fine when I picked it up, but when I got it home and in place, it decided it only wants to go up. When I try to go down it just clicks.

Anyone have any experience with this?
Electric jacks did not exist in 1960.

What exact brand and model do you have, or a photo?

Andy
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Old 01-05-2013, 09:09 AM   #4
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My first thought would be a dirty connection. Take apart switch if possible clean and re-assemble. The switch determines direction. The motor just reverses itself based on feed of the curent.

Low battery if it is slow in one direction and not operating in the other.

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Old 01-05-2013, 09:09 AM   #5
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There are several gears in there. This happened to us, and we were able to replace the stripped gear fairly easily. Open the top and look for the stripped gear.
Ok great. Is it fairly easy to open? I'm seeing teenie tiny hex screws that may or may not be stripped.
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Old 01-05-2013, 09:12 AM   #6
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My first thought would be a dirty connection. Take apart switch if possible clean and re-assemble. The switch determines direction. The motor just reverses itself based on feed of the curent.

Low battery if it is slow in one direction and not operating in the other.

>>>>>>>>>>>Action
It's getting power in both directions but it just clicks and clicks when trying to go down. Similar to the clicking when you raise it up too high.
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Old 01-05-2013, 09:14 AM   #7
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Originally Posted by Inland RV Center, In View Post

Electric jacks did not exist in 1960.

What exact brand and model do you have, or a photo?

Andy
Interesting. Maybe it's not 1960? How do I find out the exact year?

I'll take a look and get back.
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Old 01-05-2013, 09:20 AM   #8
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There's no lettering at all on it. Appears there was a label at one point but it's gone.

Here's some pics...
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Old 01-05-2013, 10:20 AM   #9
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There's no lettering at all on it. Appears there was a label at one point but it's gone.

Here's some pics...
That jack come into being in the late 60's.

The problem your having, is that the jack mechanism, is out of sync with the jack post.

Take the jack head off.

You will find some gears and a couple of switches.

Those switches are "limit" switches and control how much the motor will travel in each direction.

One of those switches may be defective at this point.

Also, to properly calibrate the motor and jack, have the motor go all the wall up.

You can do that by removing the jack head from the jack post just enough so that it does not engage the jack. Then make sure the jack is all the way up.

Then reinstall the jack motor on the jack and see what happens.

If you still have the issue, then one of those switches is bad.

Andy
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Old 01-05-2013, 10:44 AM   #10
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Edge,

Sorry I can't identify it, but I not thinking gears just yet. I have worked on two jacks one looked similar to this one and IIRC it used limit switches to turn motor off just before mechanical stops would have caused it to try to stall against the gears, not a good thing breaks teeth.

Does it look like the top cover comes off? Might find something under that cover of interest.

Possibles: The UP/DOWN switch itself is kaput but still clicks and makes a mechanical sound. Or limit switch is kaput. OR are you hearing the motor TRYING to turn, but it can't?

As an aside, I just repaired my 3500# H&H Barker by replacing the UP/DOWN switch (not a fun task AT ALL!) and found that the jack post screw section was bent slightly and got real tight while retracting, so it's my shop spare I put on a new 4500# Husky ball screw type. So far so good but it is just installed and tested at home a bit, no real trip report yet.

Good luck.

Gary
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Old 01-05-2013, 12:18 PM   #11
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Okay, so I got the top off. It looks like these two rods that fit down in a groove have become worn and I guess are slipping out.


Interestingly, the motor won't work when it's detached. I guess there's a circuit made between the two pieces?
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Old 01-05-2013, 12:29 PM   #12
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Some more info...

I was able to turn the jack manually. Once I got the weight off of it, it turned very easily. Put the motor back on and moved the jack up & down no problem. Raised it up enough to put some weight back on it and it wouldn't go back down.
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Old 01-05-2013, 01:13 PM   #13
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Edge,

Motor used post as ground if only one wire attached to it.

If this is a micro switch based shutoff, it does need syncronized. H&H Barker website has directions. Sorry, I'm on iPad plinking away.

Gary
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Old 01-05-2013, 01:57 PM   #14
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Originally Posted by Edge View Post
Some more info...

I was able to turn the jack manually. Once I got the weight off of it, it turned very easily. Put the motor back on and moved the jack up & down no problem. Raised it up enough to put some weight back on it and it wouldn't go back down.
There is a fiber gear in that jack that acts as a clutch.

It must be replaced.

Be advised that clutch gear is not very cheap.

Andy
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