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Old 11-14-2019, 09:29 AM   #1
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Air leveling valve replace

Air leveling valve leaking and can not get more the 50lbs of air pressure.
Not such a big job the cost was $42 on ebay and $130 at freightliner.
it takes about 1.5 hrs to complete, now all is good.
Air pressure now up to 150 psi
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Old 11-14-2019, 09:52 AM   #2
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Originally Posted by DOUG713 View Post
Air leveling valve leaking and can not get more the 50lbs of air pressure.
Not such a big job the cost was $42 on ebay and $130 at freightliner.
it takes about 1.5 hrs to complete, now all is good.
Air pressure now up to 150 psi

"Air Leveling Valve"?????
Are you speaking of a RIDE HEIGHT SENSOR? And, it would be nice to know what make/model/year/chassis/ etc. so that other folks with the same style coach might be better informed if and when something like this happens to them.
Scott
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Old 11-14-2019, 11:12 AM   #3
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Sure Scott

I have a 1999 Winnebago adventurer 34v, freightliner chassie

275hp cummings

It is referred to as a air leveling valve for the air springs

In what vehicle would you find a ride height sensor??
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Old 11-17-2019, 05:02 PM   #4
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I thought that air pressure was supposed to be 125 psi, is it listed anywhere?
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Old 11-17-2019, 09:30 PM   #5
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Quote:
Originally Posted by DOUG713 View Post
Sure Scott

I have a 1999 Winnebago adventurer 34v, freightliner chassie

275hp cummings

It is referred to as a air leveling valve for the air springs

In what vehicle would you find a ride height sensor??
Hey Doug,
We MIGHT be talking apples and oranges here or, apples and apples. About 99.999% of the diesel motorhomes have air bag suspension. And, those air bags need something to tell them, just how much air to be inserted into them, to keep the coach at a given height. For the most part, a "ride height sensor" is installed and is a small mechanism that is connected to the frame, and one end of either the front or rear axle. A lever extends from that mechanism, and is attached to the axle.

The other end of the lever, is attached to a valve INSIDE that mechanism that, controls the amount of air, that is sent to that particular air bag(s) and, when the lever hits a certain part of its travel, as in when the system is airing up from a dumped system situation, it shuts off the valve and, no more air reaches the air bags.

Now, if one of these "ride height sensors" (by the way, there's normally three on each coach. Some years and models, there's two on the rear axle and one on the front. Other years and models, they reverse that setup), goes bad, it can go bad in two ways. It can allow TOO MUCH AIR into the receiving air bags which, as you might guess, can cause excessive ride height or, it can go bad the other way which, looses air and, your coach rides too low.

Quote:
Originally Posted by Al10453 View Post
I thought that air pressure was supposed to be 125 psi, is it listed anywhere?
Al10453,
You are correct in that, by DOT standards, air pressure is regulated to around, 120-125 or so. But, If you put all 125 psi a set of air bags for a given coach,













































y
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2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)
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Old 11-17-2019, 09:33 PM   #6
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Quote:
Originally Posted by DOUG713 View Post
Sure Scott

I have a 1999 Winnebago adventurer 34v, freightliner chassie

275hp cummings

It is referred to as a air leveling valve for the air springs

In what vehicle would you find a ride height sensor??
Hey Doug,
We MIGHT be talking apples and oranges here or, apples and apples. About 99.999% of the diesel motorhomes have air bag suspension. And, those air bags need something to tell them, just how much air to be inserted into them, to keep the coach at a given height. For the most part, a "ride height sensor" is installed and is a small mechanism that is connected to the frame, and one end of either the front or rear axle. A lever extends from that mechanism, and is attached to the axle.

The other end of the lever, is attached to a valve INSIDE that mechanism that, controls the amount of air, that is sent to that particular air bag(s) and, when the lever hits a certain part of its travel, as in when the system is airing up from a dumped system situation, it shuts off the valve and, no more air reaches the air bags.

Now, if one of these "ride height sensors" (by the way, there's normally three on each coach. Some years and models, there's two on the rear axle and one on the front. Other years and models, they reverse that setup), goes bad, it can go bad in two ways. It can allow TOO MUCH AIR into the receiving air bags which, as you might guess, can cause excessive ride height or, it can go bad the other way which, looses air and, your coach rides too low.

Quote:
Originally Posted by Al10453 View Post
I thought that air pressure was supposed to be 125 psi, is it listed anywhere?
Al10453,
You are correct in that, by DOT standards, air pressure is regulated to around, 120-125 psi. or so. But, If you put all 125 psi a set of air bags for a given coach, with no form of control, you'd have diesel coaches riding down the road looking like those idiot 4W drive pickups that are 9 feet in the air. Your air IS regulated for the system pressure. But, each axle to ride height is individually regulated to keep a coach at a given ride height. Hope this helps some.
Scott



























































































































































































y
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Retired-29.5 yrs, SDFD, Ham - KI6OND
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