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Old 12-03-2020, 07:00 PM   #1
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Only one jack wont extend

So, I'm having an issue, and just wanted to check with the community before I started spending a bunch of money to replace things for no reason. Some troubleshooting tips would be helpful. Long story short, when I extend the jacks, 3 of the 4 go down perfectly, but one of them goes down about 3/4 of the way, and wont go down any further. The hydraulic fluid level is good.....now. It was at the minimum line when I checked it, so I added some more. Could this be an issue where I have air in just that one line, and if so, how do I go about bleeding it? I do not have much experience with hydraulic systems, so any advice would be appreciated.
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Old 12-03-2020, 07:06 PM   #2
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Quote:
Originally Posted by PNW RVer View Post
So, I'm having an issue, and just wanted to check with the community before I started spending a bunch of money to replace things for no reason. Some troubleshooting tips would be helpful. Long story short, when I extend the jacks, 3 of the 4 go down perfectly, but one of them goes down about 3/4 of the way, and wont go down any further. The hydraulic fluid level is good.....now. It was at the minimum line when I checked it, so I added some more. Could this be an issue where I have air in just that one line, and if so, how do I go about bleeding it? I do not have much experience with hydraulic systems, so any advice would be appreciated.
Is it HWH system?
Does it return OK?
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Old 12-03-2020, 07:09 PM   #3
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Did it ever work correctly for you?

If so when did it quit?

Is the RV new to you?
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Old 12-03-2020, 07:09 PM   #4
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First of all, what system do you have? What kind of motorhome do you have? Did you add oil while the three jacks were down or up? Did you try to continue to extend the jacks after the three were on the ground? If so did the other three continue to lift the coach? I know this is a lot of questions but it will help to diagnose the situation remotely.
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Old 12-03-2020, 07:18 PM   #5
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Thanks for the quick responses. I will try and answer all the questions. It is a HWH system. The rig is new to me. It is a '94 Fleetwood Southwind. The jacks (all 4) worked for me once. The next time I tried to use them was when then 4th one (front passenger side) wouldn't go all the way down. It would drop about 80% of the way. We could hear periodically afterward, that jack inching back up. All other jacks worked, and stayed, in place. All other jacks will continue to lift, even with the 4th not fully extending. All jacks retract, or return, properly.
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Old 12-03-2020, 07:20 PM   #6
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Forgot to answer one of the questions.... yes, I added the fluid while the jacks were up.
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Old 12-03-2020, 07:42 PM   #7
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Could be air in that line. HWH doesn't need to be bled but you do need to cycle them a few times to bet the air out of the system.
I doubt the jack is binding or it wouldnt retract easily.

You might try some blocking under that jack, or under others as well, to see if it acts any different?
If nothing else it may help bleed any air out.

HWH has good troubleshooting guide online and if all else fails look up azpete here on iRV2 he is the HWH guru and very available & helpful.
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Old 12-03-2020, 07:43 PM   #8
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Assuming you have a 625 system, Here's the manual. Troubleshooting your problem starts on page13

https://www.hwhcorp.com/ml35963.pdf
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Old 12-03-2020, 07:50 PM   #9
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I suggest extending the jacks and spraying them with WD40, especially the one that is having a problem.
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Old 12-03-2020, 07:57 PM   #10
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Thanks, I'll look through the manual links you guys provided. For the record, with all the jacks fully extended, I can move the 4th jack by hand almost to fully extended, but it will slowly retract back.
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Old 12-03-2020, 08:47 PM   #11
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It almost sounds like the manual release valve on the solenoid may be partly open. If not, try opening it and run the pump a couple seconds. It may have something stuck in it.
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Old 12-03-2020, 08:50 PM   #12
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What sequence are you using?
I believe all /most HWH systems that are manual level recommend side to side level first... then front to rear.
What happens if you run the problem side first?
Both Fr & Rr extent or only Rr?
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Old 12-04-2020, 05:14 AM   #13
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Contact Paul at AZPETE on the Irv2 forum. He works for HWH and can answer your questions. His email is pfmaddox@att.net and his phone number is 602-549-3638. He is a Commercial Member and has posted that his phone is always on, and if not answered, leave a message.

He has helped others on this forum and I am sure he can help you.
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Old 12-04-2020, 06:02 AM   #14
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Do you have kick-down jacks or straight jacks? Computerized leveling or not?
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