Travels with Yoly
North Georgia
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Joined: 05/29/2014
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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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bigfootford
Fair Oaks, California
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Joined: 12/03/2002
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trail-explorer wrote:Reminds me of the jackscrew on the MD80.
![[image]](http://i133.photobucket.com/albums/q44/kkeller14k/IMG_0998.jpg)
Oh yea, some of us can relate! Same technology for wing flaps too!
US Navy P3's.
Jim
2000 2500 9.6 Bigfoot,94 F250, Vision 19.5, Mich 245/70XDS2's, Bilstein shocks, air bags/pump, EU2000, PD 9260,Lifeline 100ah, 200W. solar, Morningstar Sunsaver 15A/ display panel, Trimetric, Delorme/laptop, Holux gps rec,led lights, Wave-3 heat.
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trail-explorer
NM
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Reminds me of the jackscrew on the MD80.
Bob
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Moose10
Chaffee, NY
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Joined: 01/30/2004
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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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on Vision Hauler 19.5's
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bigfootford
Fair Oaks, California
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magic43 wrote:Wow, it is good to see this thread again. I believe that it once was a "sticky".
Still is a sticky...
Truck camper university, scroll down to jacks
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/25966285.cfm
Jim
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carrnutt
Tampa Bay Area, Florida
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Definitely a life saver. Well money saver, anyways. After performing this maintenance, my jacks all work great. I still have one that's going to need to be replaced, but working for now, as opposed to replacing all four. Thanks again!!!
2014 Cougar 31SQB
1993 Dodge D350 Cummins
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magic43
Brookhaven, Ms.
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Wow, it is good to see this thread again. I believe that it once was a "sticky".
Since I disassembled, removed the skimmed paint, and properly lubricated my jacks (in August, 2012) I have had absolutely no problems. This thread was a lifesaver.
magic43
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sleepy
Oak Ridge,Tennessee
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Joined: 04/07/2003
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This is very good post... thanks for taking the time to capture the repait with detailed pictures.
I mighty be able to help with one of the simplier problems... rust!
Ijanet and I have spent a lot of time on The Gulf of Mexico Beaches over the last few year.
My jacks (Atwood) have a fine red rust hear and there all over them...
I was in my local Home Depot to get some stain for a home project... Ed, the paint department expert asked if there'd be anything elso.
I told him about the rust... asked if he had any ideas.
He suggested CLR, CLR
a product called Calcium, Lime, Rust
It was less than $6.00... I thought what the heck... I'll try it.
When I got home I used a scotch brite pad and the CLR on my jacks... hoping to get enough of the rust off to paint them...
Within a few minutes they were as clean and brilliant white as they were when I bought the camper new.
I will still paint the jacks with a thick, RustOleum paint... using a very small roller (that costs about $3.00 and comes with a roller pan.
Thanks again
Sleepy
2003 Lance 1161,/slideout/AGM batteries/255W Solar/propane generator/Sat dish/2 Fantastic Fans/AC/winter pkg
AirFoil, Trimetric, LED lights, Platcat vent heat
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mjkruid
Madison, Ne.
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Joined: 07/05/2014
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I found this topic while searching for happijac maintenance. This is the best information I've found anywhere. Thank you for posting this!
I have happijac 4500's, 14 years old. I purchased this camper this spring and the jacks are in dire need of service. I have 2 completed and they work great. My problem with the remaining 2 is that I am unable to pull out the manual socket. I have removed the C clip and the sprocket is loose on the inside but the socket will not come out. I have tried everything I can think of short of welding in a coupler nut and using a slide hammer. The drawback to this is the socket will be ruined.
Any thoughts would sure be appreciated.
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bigblue1978
Knoxville, TN
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Thanks, Bigfootford. I didn't know the proper terminology. The swivel to which I refer is perhaps called a centering block. It is internal to the black tube and is attached to the bottom of the acme screw. one of the members used a band saw to cut the black tube apart and the picture of this part shows excessive rust. I only intended to explain how I delivered hypoid oil to this part. My jack was binding, but from what I could see everything appeared to be well lubed. I did what I could to lube that which I could not see and now the problem is solved. I will try to be more accurate in the future and also to have pictures and illustrations as well.
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