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Old 07-01-2013, 07:36 PM   #1
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Slipping Hydraulic Jack Post

One of my hydraulic jack posts is slipping down about 2" or so after I level my coach. I'll raise it back up again & 20 minutes later it's down 2". There is no fluid leaking and the shaft is clean. I'm thinking that the solenoid valve is passing fluid. Any thoughts?










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Old 07-02-2013, 04:48 PM   #2
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Also could be a seal in cylinder letting it leak back.
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Old 07-02-2013, 04:51 PM   #3
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Is the fluid level OK?
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Old 07-02-2013, 05:38 PM   #4
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I had the same issue, but not as bad as yours. Mine would thunk every hour or so and drop about a 1/4 inch when I had the jack really extended. I called the jack manufacturer on mine (RVA) and they told me that dirt can get in the system and plug the seals. There is typically a solenoid/valve for each jack for both extending and retracting. They sent me a new valve for extending my front jack. It made it better, but still occasionally drops.

I decided to look at repairing it again and reread my coach manual. One of the things it mentioned, which I missed before, was to make sure the manual retract valves were all tightly closed. This is the "T" handle valve that lets you manually release the fluid in case the system quits. I found my problematic jack was a little less than tight. I'll try it out this week on a trip. Sooooo....check the manual valves first and make sure they're tight.
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Old 07-02-2013, 11:54 PM   #5
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I'd open and close the manual valves that Don discussed...possibly a small spec of something is in the seat causing a fluid loss at the jack
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Old 07-03-2013, 12:06 AM   #6
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Quote:
Originally Posted by Diplomat Don View Post
I decided to look at repairing it again and reread my coach manual. One of the things it mentioned, which I missed before, was to make sure the manual retract valves were all tightly closed. This is the "T" handle valve that lets you manually release the fluid in case the system quits. I found my problematic jack was a little less than tight. I'll try it out this week on a trip. Sooooo....check the manual valves first and make sure they're tight.
And be careful if they're like HWH systems. The valve is a needle valve and has an interference fit (like a propane overflow valve) and can be permanently damaged if tightened too tight. Just barely finger tight is enough if they haven't already been damaged by a heavy hand.
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Old 07-03-2013, 10:21 PM   #7
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Thanks for all of the responses. I will check the fluid level. & the manual bypass valves tomorrow. For now though, a 12" piece of 2x6 has corrected the problem.
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Old 07-08-2013, 11:24 AM   #8
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See the other thread on jacks last week. I started it - and finished it today. Low fluid level can give you all kinds of issues. You have a Tiffin too, so I assume they are HWH jacks. Air in the system due to low fluid level could also be your problem. Look on HWH's website for the manuals and maintenance manuals. The pump and fluid tank on our Phaeton 36QSH is in a very narrow compartment so it's tough to see and get at the tank filler (and valves) easily. Hopefully your is easier. I made a special funnel (the fill hole is not very big) using a kitchen funnel and length of 1/4" ID plastic tubing. Adding a quart of HWH jack fluid (Camping world) solved our issue immediately, but it was so low it needs another quart yet. Good luck with it.
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Old 07-08-2013, 10:50 PM   #9
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After having to manually retract the jacks on my LCI system, I had the same problem as Diplomat Don. I would check the tightness of the shut offs.
Good Luck.
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