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Old 10-24-2013, 11:08 AM   #1
RKL
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HWH jacks retract miracle

Tested jacks before leaving upstate NY.did not use them until I arrived at my site in Florida and immediately Lowered jacks and then decided to move coach further forward on pad . Hit retract and front passenger and rear driver moves upward 2 inches and stopped . Pryed them up and tried again, no luck. Pryed them again and shut down for the night . Next morning moved coach foward, lowered jacks and tried a retract. All jacks came up fast. Tried. Again,same result. Checked fluid , a little on high side,one ibch from top of resivor.

Does anyone think that the problem was fluid expansion and after cooling over night all was ok. Should I drain some out?
Fluid is at top of upper line on cap when screwed in all the way per hwh tech. Thanks. Rkl
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Old 10-24-2013, 01:45 PM   #2
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Had similar situation. After I ran them up and down several times they worked fine.
These pistons seem to be real sensative to dust and grit. It gets between the piston and outer sleeve and makes things bind up on retract.
I made it a point to wipe down the pistons before retracting.
Good Luck
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Old 10-24-2013, 05:49 PM   #3
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Cleaning the jacks with WD40 and a soft cloth is important. I had a problem with my jacks on my '05 Vectra. Turned out to be a failed "shuttle valve". Also, if the jacks are clean and the shuttle valve is working correctly you could have weak springs. I think HWH has improved them since your coach was built. (I would often have to raise a jack manually until I had the shuttle valve replaced.)

I don't recommend this what I am about to tell you just yet. I bought some CRC Power Lube on Amazon and cleaned my jacks with it. So far so good. I know silicone spray is NOT recommended by HWH. So, let me try this for a while and I will post the results on irv2 when I am convinced I am doing more good than harm.
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Old 10-24-2013, 08:24 PM   #4
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I doubt fluid expansion is an issue. The breather cap/fill opening is also an overflow point, if your tank is over-filled while the jacks are extended, then you raise the jacks, the only thing that will happen is you get to clean up the mess all over the tank and off the ground/pavement. That is, providing someone has not removed the breather cap and replaced it with a pipe plug.
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Old 10-25-2013, 07:41 AM   #5
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Cleaning the jacks with WD40 and a soft cloth is important
WD40 attracts dust ...more likely to cause problems in this case than cure anything. I have 10 years and 85k miles on my HWH jacks and have never touched the rams. Cleaning/lubing the rams should not be necessary ...I never did it on farm equipment either. When a hydraulic ram doesn't move, look for a fluid or valve issue ...or with these sometimes a spring which is not the problem in this instance
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Old 10-25-2013, 10:08 AM   #6
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I see this "WD-40" recommendation from time to time, I also see "The same fluid you top off the jacks with" recommended.

This is what I recommend: READ THE FINE MANUAL.. It will state the PROPER cleaner/lubricant to use. HINT, I have not mentioned it in this post.
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Old 10-25-2013, 11:30 AM   #7
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i dont think fluid expansion would have caused this. your fluid level in the tank was ok at 1 inch below the top. fluid level isnt that critical with hwh systems. you actually have a quart more than it takes to operate the system in the tank. if you are retracting, it would not affect the operation at all.
it may have been that your jacks were having trouble retracting because of overheated solenoids. apparently your system shut down prematurely. severe overheating will do that. cooling down overnight seems to have helped.
does your alarm go off while traveling? weak springs, or borderline solenoid valves will cause this. if you need further assistance, please feel free to call me 602-549-3638
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Old 10-25-2013, 12:03 PM   #8
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Originally Posted by wa8yxm View Post
I see this "WD-40" recommendation from time to time, I also see "The same fluid you top off the jacks with" recommended.

This is what I recommend: READ THE FINE MANUAL.. It will state the PROPER cleaner/lubricant to use. HINT, I have not mentioned it in this post.
Why not?
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Old 10-25-2013, 12:14 PM   #9
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I guess I'm more fortunate than I realised with my jacking system (don't know the brand without looking and the coach is in its winter dock). As a former airplane hydraulic systems engineer, It hadn't dawned on me that some systems don't have pressure retract and rely on external springs (shows how much I don't notice!).

On my system, there's an external line running to the bottom of the cylinder. In "retract" mode, pressure from the pump goes to the back-side of the piston and retracts the jack.

As I've mentioned in another string, I don't leave my jacks down when stored at home, as we're across the street (on the low-cost side) from homes that are salt-water marina waterfront. The jacking system manufacturer says not to leave them down in close proximity to salt water. When is asked how they defined "close", the reply was "within 60 miles". I doubt we're much over 60 yards away.

When we're camping near salt water, I wrap a garbage bag around the piston rods after they're extended.
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Old 10-26-2013, 08:27 AM   #10
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Originally Posted by AFChap View Post
WD40 attracts dust ...more likely to cause problems in this case than cure anything. I have 10 years and 85k miles on my HWH jacks and have never touched the rams. Cleaning/lubing the rams should not be necessary ...I never did it on farm equipment either. When a hydraulic ram doesn't move, look for a fluid or valve issue ...or with these sometimes a spring which is not the problem in this instance
Not true. HWH recommends this be done from time to time because WD40 dries and leaves no sticky residue as silicone sprays will. Please refer to the latest information on their website. Here is the link: http://www.hwhcorp.com/ml47149.pdf

I hope this helps to clear up any confusion. I had a problem with my jacks coming slow or sticking on my last coach. I had two problems. One was that i was using silicone spray on them and the other was that the shuttle valve was failing and was finally diagnosed and replaced at Forest City.
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Old 10-26-2013, 08:51 AM   #11
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Originally Posted by Madrona View Post
Why not?
I think the point being made by wa8yxm is folks really need to read manuals. Any site dedicated to supporting others with any device be it mechanical, electrical or whatever has many positives but it also has negatives. The biggest negative is that folks listen to other folks and then think they have the proper answer. Clearly, nothing should be taken as correct unless it is validated by reading instructions/manuals too.

Now, I could be wrong about his intent but...I like my interpretation anyway.
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Old 10-26-2013, 09:09 AM   #12
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Not true. HWH recommends this be done from time to time because WD40 dries and leaves no sticky residue as silicone sprays will. Please refer to the latest information on their website. Here is the link: http://www.hwhcorp.com/ml47149.pdf

I hope this helps to clear up any confusion. I had a problem with my jacks coming slow or sticking on my last coach. I had two problems. One was that i was using silicone spray on them and the other was that the shuttle valve was failing and was finally diagnosed and replaced at Forest City.
Read that article carefully to be SURE there is no confusion ...it begins by saying that lubrication of the shafts is normaly neither necessary nor desired. It refers to WD40 as a cleaner to use IF the shafts have been crudded up by silicone or other substances. (don't crud them up and you won't need WD40!) And when it mentions WD40 for cleaning, it also says you should follow by wiping the shafts with a clean, soft cloth. if you don't wipe them down very well, the WD40 WILL attract dust/dirt. WD40 is primarily a cleaner/de-gunker. If a lube is needed, ...and it is NOT ... it would be added after the cleaner/degunker is wiped off.
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Old 10-26-2013, 09:25 AM   #13
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there is nothing better than a owners manual unless its a service manual. both have valuable information that allows an owner to make a good decision.
in almost all of my replies to questions, the first thing i ask is if the owner has a service manual. its almost impossible to discuss a problem if both parties dont have the same information.
as far as the wd40 question, read the manual first, then do what you want. its your jacks, so do as you wish.
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Old 10-27-2013, 06:49 AM   #14
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Originally Posted by azpete View Post
there is nothing better than a owners manual unless its a service manual. both have valuable information that allows an owner to make a good decision.
in almost all of my replies to questions, the first thing i ask is if the owner has a service manual. its almost impossible to discuss a problem if both parties dont have the same information.
as far as the wd40 question, read the manual first, then do what you want. its your jacks, so do as you wish.
Now, who can argue with this advice? Only a fool. I have seen many 'opinions' fall flat on their face when measured against facts.

One of the problems I have read in this forum about jacks is failure because of a slight bend to the ram. I wonder if the manufacture installed under rated jacks for the weight application?

My jacks on this coach have a slight leak. The landing pad is a bit moist on top but no puddling. I have cleaned the rams with the WD40 and, this last time, sprayed them with the CRC Power Lube. So far so good. My slides ride on Power Gear and I have sprayed the power lube on the rack and pinion gears and rollers. This is recommended by Power Gear. Once again, so far so good.

My patio awning sounded like a cat fight when it was opened or closed. I sprayed the track and moving parts down with the CRC and the cats are gone! This seems to be great stuff. And I thank irv2 for introducing me to it.
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