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Old 09-11-2017, 07:28 PM   #1
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Air ride questions

I am new to the class A diesel pusher family learning as I go. I have a 2005 Mandalay Presidio 39 c on a workhorse chassis. The passenger side front likes about 1 to 1 1/2 inches being level with the drivers side. I have left it idling for at least 30 minutes but it still will not level up . I was hoping someone could maybe lead me in the right direction. Thanks
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Old 09-11-2017, 07:30 PM   #2
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...is the coach perfectly level??

WDK
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Old 09-11-2017, 07:31 PM   #3
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you may have to have the slack adjuster adjusted. the factory can tell you what the ride height should be for the MH.
see here _ https://www.google.com/url?sa=t&rct=..._HtqbJ2rPEPo_w
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Old 09-11-2017, 08:04 PM   #4
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you may have to have the slack adjuster adjusted. the factory can tell you what the ride height should be for the MH.
see here _ https://www.google.com/url?sa=t&rct=..._HtqbJ2rPEPo_w
"Slack adjuster" or, Ride height sensor? The term slack adjuster normally applies the adjuster for the brakes.
Scott
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Old 09-11-2017, 08:27 PM   #5
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Find out how many airbag valves it has. Could very from 1-4. If air ride front 2 is the min but will usually have 3. With 3 may be impossible to get 100% level as items in cabinets can change the way it sits. 4 corner weight may help with determining why also
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Old 09-11-2017, 08:46 PM   #6
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I believe you need to adjust your ride height on the lower corner if it is possible. Even if the amount of weight changes the ride height should go to the "set" level no matter what amount of weight is on it. My truck sits at the same height no matter what the load is, put 2000# in it and it will "level" itself in just a little bit.
You will need to have at least 3 sensors to level the vehicle, 2 on the front and 1 or 2 on the rear. You could have a bent linkage or a bad valve too. If you look over the valve and linkages under your coach compare them to each other. The front should look the same on each side but the rear will probably be a little different.
Good luck!

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Old 09-12-2017, 08:45 AM   #7
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Quote:
Originally Posted by FIRE UP View Post
"Slack adjuster" or, Ride height sensor? The term slack adjuster normally applies the adjuster for the brakes.
Scott
thanks Scott - wrong brain function. Here is a PDF on freightliner tiffin air ride
http://www.tiffinrvnetwork.com/crusingator/P/P-038.pdf
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Old 09-12-2017, 10:10 AM   #8
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Air ride questions

Thanks for all the responses. I never thought of where and how the coach was sitting. It is parked on fresh gravel with the front slightly down hill. I am going to station in next couple of days to top off the fuel. So I will recheck on level concrete. I just purchased this coach the 1st of May from a friend of mine that bought it new it only has 13k miles but hasn't been used in 3 years. Always keep in dry storage. I didn't notice the difference in the level until after I replaced the shuttle valve due to the slides and Jacks not working. Also have replaced the step motor and 12v water pump. Doesn't do a coach any good sitting for long periods. Thanks for all reply Glen
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Old 09-12-2017, 11:45 AM   #9
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Hi Glen! Welcome to IRV2! We're sure glad you joined the gang!

Sorry I can't help with your question! Keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 09-12-2017, 11:47 AM   #10
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Thanks for all the responses. I never thought of where and how the coach was sitting. It is parked on fresh gravel with the front slightly down hill. I am going to station in next couple of days to top off the fuel. So I will recheck on level concrete. I just purchased this coach the 1st of May from a friend of mine that bought it new it only has 13k miles but hasn't been used in 3 years. Always keep in dry storage. I didn't notice the difference in the level until after I replaced the shuttle valve due to the slides and Jacks not working. Also have replaced the step motor and 12v water pump. Doesn't do a coach any good sitting for long periods. Thanks for all reply Glen
Glen,
As has been explained, it's potentially possible that your ride height sensor or, sensors may be out of adjustment. And, contrary to some popular belief, it DOESN'T matter what's put into any compartments or, what kind of tongue load their is on the trailer hitch or anything else. The ride height sensors AUTOMATICALLY compensate for load changes. I can attest for that easily. We have an '04 Itasca Horizon 36GD with the C-7 330HP CAT engine.

A while ago, I installed what's called a "Hydralift" motorcycle carrier on the back of our coach. I then loaded our '08 Honda GL 1800 Goldwing on it. Well, the bike hovers around 900 lbs and, the lift/carrier another 375 lbs. or so. So, based on the leverage that was encountered due to the dynamics of that load, I was 2,100 lbs. OVER the GAWR of the rear axle.

But, even with that much overweight on the rear of the coach, those ride height sensors compensated and, put the coach at the SAME EXACT HEIGHT with that load on it, as it sat WITHOUT the load. I did all the measuring so, that's how I knew those sensors worked.

So, on yours, yes, you may have one or more out of adjustment or, it's possible that you may have a defective air bag. But, the important point here is to get it to level concrete to really analyze its stance. Then make a determination as to what's needed for correction.
Scott
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Old 09-12-2017, 11:57 AM   #11
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Find out how many airbag valves it has. Could very from 1-4. If air ride front 2 is the min but will usually have 3.
Not always true, my rig (and many others) has one in front and two in the rear. The '02 DSDP had two in front and one in the rear.
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Old 09-12-2017, 02:13 PM   #12
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Glen.....Some basics......Diesel pushers come with air valves that constantly adjust the height of your coach as you drive. This height is called the "ride height". The ride height does several things. First, it makes the coach sit level when parked, and adjust automatically to loads to keep it level while driving. A correctly adjusted ride height makes the coach handle at it's optimum, by keeping the coach level as it goes down the road. Being too low or too high at the front or rear or any wheel can cause a weight transfer and affect handling and ride. The ride height also keeps the drive shaft at the correct angle. These drive shafts are very short and maintaining the correct angle is critical.

Coach manufacturers set up their ride height valves differently. On my Monaco, it had two in the front and one in the rear. My new coach (Freightliner) has two in the rear and one in the front. Typically, they're trying to create a triangle. Generally, the two on one axle are adjusted first and the single valve is last.

These valves are attached to the axles with a long rod that is adjustable. If you look under the coach, you should be able to see the rods. On occasion, these rods can be struck by road debris and bend, thus changing the ride height adjustment.

Since the coach is new to you, I would load it up as you would normally use it and have a shop adjust the ride height to specs. After that, you can pretty much keep an eye on it and know when it might be out of adjustment again, which doesn't happen very often.

Adjusting ride height is not difficult and can be done in under 30 minutes. The problem is that it has to be done from under the coach and it's dangerous if you're not experienced at doing it.....the coach could drop suddenly.
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