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02-25-2010, 05:53 PM
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#1
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Member
Monaco Owners Club Solo Rvers Club
Join Date: Aug 2009
Posts: 83
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What type of hydraulic fluid for levelers?
When replacing the hydraulic fluid in my leveler system, what type of fluid should be used? I have been told that it is important to use the correct type to match the seals in the system. Then I was told it doesn't matter use "any" ATF to top off. I have RVA Jacks JII "22.5A" on my 99 Monaco. The operating instructions do not mention the correct fluid. Is it okay to mix with other types? Is it ever necessary to flush out system?
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02-25-2010, 08:07 PM
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#2
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Senior Member
Winnebago Owners Club
Join Date: May 2009
Location: AZ Mountains
Posts: 394
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It's always best to follow the mfr's recommendation. If you can't connect with the jack mfr (try Google) ask Monaco. I'm assuming you don't have the manual,or you'd know the answer already!!
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02-26-2010, 04:07 AM
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#3
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Moderator Emeritus
Country Coach Owners Club Appalachian Campers Gulf Streamers Club
Join Date: Mar 2000
Location: Chattanooga, Tn.
Posts: 12,060
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Usually Dextron III or equivalent is used.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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02-26-2010, 08:18 AM
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#4
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Moderator Emeritus
Join Date: Oct 2002
Location: Sheboygan, WI
Posts: 5,644
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HWH does have their own hydraulic fluid. It's clear but it's properties are the same as Dexron III so you can use ATF if you wish. If you have HWH slideouts as well you may want to consider staying with the HWH fluid rather than Dexron. The HWH fluid won't leave a stain on your carpeting should you ever develop a leak in the slideout hydraulics, whereas the red Dexron will. Otherwise, they'll both work just fine. I stuck with the clear HWH fluid for that reason. It costs more than Dexron but you really don't need to add any once it's topped off and all the air is burped out of the system. The only time the fluid level would ever go down is if you get a leak. New coaches typically need to add some at their one year service because the air has finally been purged from the system. After that the level should remain the same.
One other thing to keep in mind when checking your fluid level is that hydraulic rams need to be fully collapsed whenever you check the oil level in the reservoir. Otherwise, when you collapse them, the oil will overflow out ther reservoir's breather cap. So when you check your oil level you need to be sure that the jacks are fully retracted. Now most people understand this so it's not a big problem.
However, if you have HWH's side mounted slideout mechanisms, as my Allegro Bus does, you need to extend the slides when you check the oil level. That's just the opposite as to what you might think but the reason is that the side mounted slideout mechanisms use a scissors type mechanism to extend the slideout. The hydraulic ram actually collapses in order to extend the scissors mechanism and extends when the slideout is retracted. If you have separate reservoir (as I do) for the slideouts be sure to run the slideouts out before checking the oil level. Note that this is onkly for the side mounted mechanism. If you have the older style "under the floor" mechanism then the slides are operated directly bythe hydraulic cylinders and you want them retracted when checking the oil level.
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02-26-2010, 10:28 AM
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#5
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Member
Monaco Owners Club Solo Rvers Club
Join Date: Aug 2009
Posts: 83
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Quote:
Originally Posted by Cruzer
One other thing to keep in mind when checking your fluid level is that hydraulic rams need to be fully collapsed whenever you check the oil level in the reservoir. Otherwise, when you collapse them, the oil will overflow out ther reservoir's breather cap. So when you check your oil level you need to be sure that the jacks are fully retracted. Now most people understand this so it's not a big problem.
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Just so I understand correctly... The Operating Instructions states the following:
"If it is necessary to fill with additional fluid, start by extending any jack 6" from fully retracted position (other jacks should be fully retracted). Unscrew reservoir cap from top of pump, fill until red light and bong turn off then stop adding fluid and replace cap."
Is this contradicting what you said? Or... is the difference in checking vs adding fluid?
Thanks for your help! This forum is always helpful to me.
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02-26-2010, 10:36 AM
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#6
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Junior Member
Join Date: Jun 2009
Posts: 2
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you are correct on checking the fluid level procedure
Dextron 3 or equivalent is what is recommended for RVA Jacks, go to their web site for further details.
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02-26-2010, 10:54 AM
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#7
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Moderator Emeritus
Join Date: Oct 2002
Location: Sheboygan, WI
Posts: 5,644
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Apparently RVA has a slightly different procedure than HWH. They want one jack extended a bit. Not quite sure why, but if that's what they want, then that's the way to do it. It sounds like their alarm system measures fluid level rather than using jack height positioning sensors. Maybe they want that cushion to give the alarm more room to breathe.
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Mark & Leann Quasius
2016 Cornerstone 45A
2020 Jeep Gladiator Rubicon
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02-26-2010, 02:21 PM
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#8
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Senior Member
Alpine Owners Club
Join Date: Sep 2005
Location: Traveling in North America
Posts: 2,248
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Quote:
The HWH fluid won't leave a stain on your carpeting should you ever develop a leak in the slideout hydraulics, whereas the red Dexron will.
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Ours would just leak into the basement, so I don't worry about the color. In fact, the color helps to see if there is a leak (had one on one jack several years ago).
Barb
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02-28-2010, 11:25 AM
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#9
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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Carefully clean the outside of the tank where the fluid is stored or the area around the filler tube.
Odds are there is a label,, Mine says Dextron III
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