Moose10
Chaffee, NY
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What a great thread!
I recently had to service one of my rear jacks, but not the screw, the actual 12v motor. So the camper had been on the truck for about six months, and we were out camping and I went to lower the two rear jacks for stability. One worked and the other didn't. The first thing I did was check the fuses and of course the rear passenger side was blown, so I replaced it, tried the jack again and blew another fuse. To make for a shorter story, after getting home from that trip I pulled the jack off the camper and removed the motor to find out that the coil wires were bound up by rust on/in the magnet or stator. Also, the white plastic cup around the motor had water in the bottom of it.
I took it all apart, cleaned and dried everything, put it back together and silicone all the seals and it works fine now. I'll probably inspect and seal the other three now too.
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trail-explorer
NM
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Reminds me of the jackscrew on the MD80.
![[image]](http://i133.photobucket.com/albums/q44/kkeller14k/IMG_0998.jpg)
Bob
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bigfootford
Fair Oaks, California
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trail-explorer wrote:Reminds me of the jackscrew on the MD80.
Oh yea, some of us can relate! Same technology for wing flaps too!
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Travels with Yoly
North Georgia
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What a read ! Finished all 17 pages in one sitting. I am new to TCs and trying to absorb as much as I can. We have a new 2016 camper and I noticed something in the Happijac manual that came with the camper that relates to many posts here about the different rates at which the legs extend and retract. The manual was very clear in stating that the four corners of what has been called the "box" do not carry equal weights. Some corners are heavier than other corners and that alone is the reason the legs move at different rates (speed). I just thought I'd add this to the pile of knowledge here.
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Grit dog
Black Diamond, WA
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Bringing this back to the top. Found it very useful this weekend.
Thought I had a jack with stripped teeth or threads or something. Turned out was a bunch of rust accumulated jamming it up. Thorough disassembly greasing and oiling made it work like new again.
Probably should do the other 3......
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northsantiam
Oregon
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Good thread and found to be very helpful. I had 2-4100 jacks that had bad thrust bearings, 1 completely destroyed and 1 on its way. I was able to find these little thrust bearings at MSC Industrial supply. I serviced the front 4600 jacks, they looked good but a little short on grease at thrust bearing and thrust plate. Had to adjust clutch on one of them a tad. Cannot figure out how to attach pictures so if anyone wants to see what I had and what I bought, drop me an email.
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Old Islander
British Columbia
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This thread is now 8 years old, and just as relevant as the day it was posted. I'd like to thank Kevin, the OP -- I was able to quickly and easily dismantle my Model 4150 jacks, thanks to his text an pics.
One issue I had with mine was the socket part that the manual jack handle inserts into.
Here they are from the exploded parts diagram:
![[image]](https://c1.staticflickr.com/5/4235/35147010025_9d5cab30c9.jpg)
On a couple of my jacks, this metal insert (#13) was so stiff turning in the plastic sleeve (or bushing), that the housing got quite hot while running the jacks up/down. The electric motors were working a lot harder than they should have had to. A bit of machine oil in the socket didn't help.
I have a wood lathe and after cleaning the surface of the metal insert, mounted it on the lathe. Then trued it up with a fine flat metal file. It was almost like some sand had gotten in there and scored the surface. When I reinserted it into the plastic bushing with some lithium grease, it turned as smooth as butter, and the jack now works perfectly.
* This post was
edited 06/07/17 10:34am by Old Islander *
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Old Islander
British Columbia
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BTW, HappiJac sent me a package of 13 PDF's with a good deal of information about these jacks (exploded diagrams, etc). They total about 10 megs. If anyone can suggest a public place to upload them so they're available to all, I'd be happy to do that.
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KKELLER14K
BEAVERTON OREGON
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Well hello everyone!! I am thrilled to see that this is still a hot topic. It is my pleasure to have helped my fellow TC family. Granted this did not cover nor could it cover all of the models produced but it sure gives you a good place to start. After many years of YouTube and such, this was and still is an easy find here on our own forum. Jacks will fail not if but when it is the worst possible time. Keeping them maintained with re-lubrication and free of moisture will give you a hassle free experience. No one expects a fail, but fail to plan, plan to fail. Thanks for the shout out Old Islander..
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stevenal
Newport, OR, USA
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Old Islander wrote:BTW, HappiJac sent me a package of 13 PDF's with a good deal of information about these jacks (exploded diagrams, etc). They total about 10 megs. If anyone can suggest a public place to upload them so they're available to all, I'd be happy to do that.
I use http://files.engineering.com/upload.aspx. Not sure what the size limit is.
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