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Old 07-08-2021, 05:46 PM   #1
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RVA jack system

Is anyone out there familiar with this jack system? I appear to be having an issue getting my jacks to travel the "full" travel distance. I have dumped the air, and placed blocks under all wheels. I am not on a very severe slope. Just wanting to raise the left rear more, but it won't go any higher. Brazels took over RVA and when I talked to them last month, they said what I was describing was a pump pressure issue and that maybe my pump was on the way out. I don't believe it is an electrical issue such as a switch's or solenoid. Everything is working as it is supposed to, just that the left rear jack won't raise more than half way. Last month at another RV park, it was the front jack that wouldn't raise high enough. I have topped off the fluid as well. I posted this on another forum and someone said years ago they had a similar issue with their RVA system and that there is a screw on the pump that can be turned to increase pressure. Anyone know of this? I am uploading 3 pictures. One is the level of the site we are on today, another is the rear jacks showing they are about at half way extended, and the last picture is of the front jack also about half way extended. I want to raise the left rear another inch or 2 and it won't go any higher. Anyone experience this particular problem?
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Old 07-08-2021, 07:25 PM   #2
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It actually sounds like you have a air pocket in the hydraulic fluid. Since you have topped it off try forcing it closed with a 2x4 or other pry bar and cycle the system a few times. If it starts working correctly the great! If not then you may want to look at the pump. Hope this helps.
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Old 07-08-2021, 08:54 PM   #3
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The pump does have a pressure relief in it that can be turned up. I had to turn mine up to be able to actually raise the coach with the jacks. When I was having trouble I found the attached document,



I make no claims as to whether it is acceptable practice
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File Type: pdf _RVA Jacks - How To Increase Pressure.pdf (140.3 KB, 44 views)
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Old 07-08-2021, 11:18 PM   #4
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Quote:
Originally Posted by crb478 View Post
It actually sounds like you have a air pocket in the hydraulic fluid. Since you have topped it off try forcing it closed with a 2x4 or other pry bar and cycle the system a few times. If it starts working correctly the great! If not then you may want to look at the pump. Hope this helps.
Not sure what you mean. My jacks go up all the way. Just not down as far as I wish.
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Old 07-08-2021, 11:20 PM   #5
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Quote:
Originally Posted by jacwjames View Post
The pump does have a pressure relief in it that can be turned up. I had to turn mine up to be able to actually raise the coach with the jacks. When I was having trouble I found the attached document,



I make no claims as to whether it is acceptable practice
This is exactly what I was after. Wow, thank you very much!!! If you are anywhere near me, beers on me. I am in S. CA. I will report back next week on whether I was able to gain any more out of my jacks by this adjustment.
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Old 07-09-2021, 06:12 AM   #6
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Air in the line will not allow the jack to extend completely, just like bleeding brakes, you have to get the air out. Park on flat ground, extend the Jack’s several times and retract them completely until you’ve given the fluid enough time to work the air out of the line. If you can do this from full ride height it will probably work better.
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Old 07-09-2021, 06:48 AM   #7
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Possibly you are low on fluid and level sensor is stuck up or shorted closed or in an open state as well fooling system. One jack down should alarm system not to engage trans. If stacks of lumber under jacks doesn't fix issue probably not low on fluid . My RVA jacks seem more powerful when battery is high end on charge as well.
If spring return jacks and not low on fluid there can't be much air in system unless pump is sucking air some how, the design of these flooded pumps makes that unlikely unless leaking into/out of motor end seal or very low on fluid.
I have had many issues with with relief valves as mentioned , in hvy. equip. ,forklifts, pressure washers ,hyd system as at work. A bad seal ,O-ring or debris in valve is all it takes. But just cranking them up if adjustable without knowing proper relief pressures is not a good idea ,as well as risky to persons and equiptment.
A temporary inline gauge to cylinder lift hose, proper rated Tee and fittings is advisable.
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Old 07-09-2021, 07:50 AM   #8
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RVA is a 3200 psi system. As 153stars said cranking the pressure up without knowing if you have another problem isn't a smart move.
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Old 07-09-2021, 01:38 PM   #9
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Fluid is full, jacks retract just fine. Not sure how air could have gotten in the system, but jacks have been cycled up and down enough to remove any air. Only other choice I have is to tweak the adjustment and see what happens. This is a good read provided by Jim J. https://www.nwtfc.com/wp-content/upl...e-Pressure.pdf
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Old 07-09-2021, 06:17 PM   #10
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On my 2005 Monaco Diplomat with three RVA jacks, the tank and solenoids were located in the vented door, just in front of the the driver's side rear dual. If you look at the tank and solenoids, there are three "T" handle valves. They are the manual release valves, to allow the jacks to retract if there is an issue with the pump. The springs will pull them back up. On mine, I had issues with debris getting in those valves and one of the jacks would slowly leak down.

Just for the heck of it, I would extend the jacks as far as they go, then release all three "T" handle valves and let them retract. The "T" handles are a needle valve at the other end, so when you tighten them back, you only tighten or snug them until they seat.

Once you do that, lower just the front jack six inches. The tank is supposed to be filled with that jack down six inches. Turn your ignition on and see if the jack alarm sounds. If it doesn't the tank has enough fluid, if it does alarm, leave your driver's window open and slowly fill the tank until the alarm quits. That should be the correct level.

Lastly, your tank and assembly is probably covered in fluid. The vent on the tank always puked fluid. The breather is either a 1/4" or 3/8" fitting. Back when I owned mine, everyone removed that breather, added a piece of 3" long threaded pipe and reinstalled the breather on the end of the 3" pipe. This stopped the fluid from getting all over the pump.

I wish I still had the phone number to the designer of the system. He used to answer his phone and provide tech support.
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Old 07-09-2021, 10:13 PM   #11
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Quote:
Originally Posted by Dutch Star Don View Post
On my 2005 Monaco Diplomat with three RVA jacks, the tank and solenoids were located in the vented door, just in front of the the driver's side rear dual. If you look at the tank and solenoids, there are three "T" handle valves. They are the manual release valves, to allow the jacks to retract if there is an issue with the pump. The springs will pull them back up. On mine, I had issues with debris getting in those valves and one of the jacks would slowly leak down.

Just for the heck of it, I would extend the jacks as far as they go, then release all three "T" handle valves and let them retract. The "T" handles are a needle valve at the other end, so when you tighten them back, you only tighten or snug them until they seat.

Once you do that, lower just the front jack six inches. The tank is supposed to be filled with that jack down six inches. Turn your ignition on and see if the jack alarm sounds. If it doesn't the tank has enough fluid, if it does alarm, leave your driver's window open and slowly fill the tank until the alarm quits. That should be the correct level.

Lastly, your tank and assembly is probably covered in fluid. The vent on the tank always puked fluid. The breather is either a 1/4" or 3/8" fitting. Back when I owned mine, everyone removed that breather, added a piece of 3" long threaded pipe and reinstalled the breather on the end of the 3" pipe. This stopped the fluid from getting all over the pump.

I wish I still had the phone number to the designer of the system. He used to answer his phone and provide tech support.
Thanks Don. I filled mine a few weeks ago and made a mess. Otherwise, System has been dry. Once we get back from Big Bear and I get my rig home on the side yard, I am going to turn up the pressure just a tiny bit. Brazels seems to think my pump pressure is low or the pump is going bad. Another poster on here had success turning up his pressure, so that is what I will try.
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Old 09-03-2021, 08:52 AM   #12
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RVA jack preasure issue

Quote:
Originally Posted by jacwjames View Post
The pump does have a pressure relief in it that can be turned up. I had to turn mine up to be able to actually raise the coach with the jacks. When I was having trouble I found the attached documen
I make no claims as to whether it is acceptable practice
SO All my jacks go up and down perfectly BUT then pump shuts down as soon as motorhome lifts slightly. Yellow light is blinking all the time when system is on?? Tried turning up the preasure 1/4 turn no help, turned up another 1/4 turn same effect. Motorhome just won't lift like it used to. Is there a sensor shuting down the pump? What makes the yellow light stay on??
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Old 09-03-2021, 09:12 AM   #13
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Yellow light means that side of Coach is low (Coach not level). When the yellow lights goes out (meaning Coach is level) the pump stops. Light should be on steady though. Maybe the "leveling sensor" is faulty and teetering between level and not level mode.

You could try adjusting it to see if the yellow lights go off (adjust when Coach is level). On my Coach the leveling sensor is on the ceiling of the front Electrical Bay. With Coach level (uses a bubble level inside coach to confirm) you tighten or loosen the three mounting screws until level is achieved and the yellow lights go out..
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Old 09-03-2021, 09:36 AM   #14
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Do you know the make/model of your leveling system.

Mine is an RVA II system. Here is a link to the instructions for system I have
https://www.rvajack.com/RVA-Manual-J...g-Instructions
I do not have auto level on mine, it is strictly a manual system. There is a reference to the amber light, it will start to flash yellow when you start retracting the jacks. The red light will stay on until all the jacks are up.

If you system is cutting out you may want to check your voltage, there is a minimum voltage requirement for the system to work correctly. You may also want to check the hydraulic fluid level, if it is low there may not be enough fluid to lower all the jacks far enough to raise the coach.
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