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Old 10-29-2017, 08:47 PM   #1
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Rear Hydraulic Jacks not going all the way up

1999 National Seaview 8334
Ford V10 F53

The front jacks will lift the front end off the ground but the rear jacks will not.

I have lifted the rear of the RV off the ground before with them before.

The reason I was playing around with them was the last time we took the RV out we were sleeping and I noticed that the RV would slightly lower every 30min to hour.

Any ideas?

Thank you
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Old 10-29-2017, 08:53 PM   #2
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What system do you have? HWH?

If it is an HWH system, I would venture a guess that it is the solenoids to the rear jacks that are leaking. That means that they are not holding the fluid in the lines to the rear jacks thus allowing the pressure to bleed off of the system and that will allow the jacks to be pulled up by the springs.
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Old 10-29-2017, 09:33 PM   #3
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Quote:
Originally Posted by rvbiker45 View Post
What system do you have? HWH?

If it is an HWH system, I would venture a guess that it is the solenoids to the rear jacks that are leaking. That means that they are not holding the fluid in the lines to the rear jacks thus allowing the pressure to bleed off of the system and that will allow the jacks to be pulled up by the springs.
Agree.
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Old 10-29-2017, 09:56 PM   #4
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Originally Posted by vsheetz View Post
Agree.
Quote:
Originally Posted by rvbiker45 View Post
What system do you have? HWH?

If it is an HWH system, I would venture a guess that it is the solenoids to the rear jacks that are leaking. That means that they are not holding the fluid in the lines to the rear jacks thus allowing the pressure to bleed off of the system and that will allow the jacks to be pulled up by the springs.

I believe I have a Power Jack system. Thats what the controller is, but maybe the jacks are HWH?

How can I test the solenoid?
Do you know were it might be located?
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Old 10-30-2017, 05:50 AM   #5
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You have POWERGEAR jack system.


At the top of this forum page is files you will find information on powergear jacks.
One link below, you need to download it.


http://www.irv2.com/forums/downloads.php?do=file&id=37
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Old 10-30-2017, 07:20 PM   #6
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You have POWERGEAR jack system.


At the top of this forum page is files you will find information on powergear jacks.
One link below, you need to download it.


http://www.irv2.com/forums/downloads.php?do=file&id=37
Thank you for the manual, do you still think its a solenoid or do you have any suggestions on what to check
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Old 10-31-2017, 05:36 AM   #7
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For safety you should never use the jacks to lift the rear wheels off the ground.


Have you checked the fluid level.
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Old 10-31-2017, 06:00 AM   #8
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Sounds like one of the valves is leaking. If yours is like mine, you have two valves for the rear (one for each side) and one valve for the front. And a return valve

Drain the reservoir of the old fluid.

Look on page 10, Item #5, of the manual you downloaded.

Remove each valve, one at a time. (4 valves total, 3 jacks and 1 return). Clean the valve with brake cleaner. Use a couple jumper wires and energize the coil to get the valve to open/close while your cleaning it. Replace both o-rings and re-install the valve.

Refill and bleed the system with Valvoline ATF synthetic.
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Old 11-01-2017, 10:35 AM   #9
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For safety you should never use the jacks to lift the rear wheels off the ground.


Have you checked the fluid level.
Lifting the back of the RV was just a test I would never leave it like that or work ender it like that.

Yes Fluid level is good

Quote:
Originally Posted by Waiter21 View Post
Sounds like one of the valves is leaking. If yours is like mine, you have two valves for the rear (one for each side) and one valve for the front. And a return valve

Drain the reservoir of the old fluid.

Look on page 10, Item #5, of the manual you downloaded.

Remove each valve, one at a time. (4 valves total, 3 jacks and 1 return). Clean the valve with brake cleaner. Use a couple jumper wires and energize the coil to get the valve to open/close while your cleaning it. Replace both o-rings and re-install the valve.

Refill and bleed the system with Valvoline ATF synthetic.
Thank you sounds like I need to dedicate a full day to this one. Great information. Thank you for taking the time to share.
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Old 11-01-2017, 10:44 AM   #10
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Quote:
Originally Posted by rvbiker45 View Post
What system do you have? HWH?

If it is an HWH system, I would venture a guess that it is the solenoids to the rear jacks that are leaking. That means that they are not holding the fluid in the lines to the rear jacks thus allowing the pressure to bleed off of the system and that will allow the jacks to be pulled up by the springs.
If it was HWH its most likely the shuttle valve. Had the same problem.

But its not an HWH as per the OP update. Just putting that in here in case someone comes across this and starts tearing apart their HWH solenoids.
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Old 11-18-2017, 12:39 PM   #11
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Just replaced my Power Jack system (broken fluid tank). The instructions for cleaning the valves is accurate. Easy to remove the valve after draining all the fluids. I would check the dump valve first. With clean new fluid, all the valves work great. Messy but easy to do.
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