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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #11  
Old 3 Weeks Ago
Randy Dupree's Avatar
Randy Dupree Randy Dupree is offline
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The WM147P can be a real PITA,they can do weird things.
Last summer i fought a ride height issue all summer.
I changed the HCV 3 times on the left side,and adjusted all 3 many times.
One day the left side would be way high,the next day it would not air up.


Finally i decided the WM147P had to be bad.
So once i got home i changed them both out on the drive axle.


I took the old ones apart to see how they worked and to see what could go wrong.
Both of mine had bad O-rings,the O rings are small and mine were worn out,the shaft they were on would fall out of the housing.
They were also dry,no lube left on them.


I need to think about how to explain what they do when they bypass..
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2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
www.buybyebluebird.com

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  #12  
Old 3 Weeks Ago
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Randy Dupree Randy Dupree is offline
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Quote:
Originally Posted by Bill Pape View Post
Found these on ebay a while ago, still not up on the high priority list.
About a dozen parts. The circular filter Randy spoke of is in the lower left corner.
I would rebuild one,if i had the kit.
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Randy Dupree
2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
www.buybyebluebird.com

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  #13  
Old 3 Weeks Ago
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Randy Dupree Randy Dupree is offline
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I have never found an air leak out of the bottom screens,to have a leak there would mean the diaphragm has a hole in it and the air dump switch would have to be "made",asking to dump the air.


Chap called me one day and asked me this question.
Why does the back od my coach leak down on both sides?
It would seem that if one of the HCVs was leaking it would only leak down on one side?


Dang,he was right (again).
So if both sides of the rear leaks down it has to be the WM147P dump valves leaking by.
Unless the air bags on each side are all leaking the same?


So,after the fiasco of changing HCV at every rest area last summer i changed the dump valves on the drive axle and took them apart to see just how they worked and if mine were bad.


Both of mine had worn out Orings.
So they were leaking by and since i put new ones on i have fixed my problem.


The drive axle has 2 dump valves,one for each side but there is a common air line that runs between them,and thats also the line that controls when they dump.
That line goes to the switch on the dash.


If the Orings in the valves are bad the air can leak out of the bags and out through the little holes in the dump valve,which are way up on the sides of the valve and i never checked for air leaks on those holes,heck i didn't even know what those holes did.


What i have not wrapped my head around yet is if one dump valve is worn out,can it leak back through the dump control hose to the other dump valve,and make it dump the system,i say yes,but i am not sure.


If the air leaks by the orings it can put pressure on the diaphragm which opens the valves and dumps the air.
So,if the back of your coach drops on both sides you have a bad dump valve.


Theres more to this story and it can be a brain tease,but i have work to do,be back later...
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2000 LXI 43
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Port St Joe Fl.
www.buybyebluebird.com

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  #14  
Old 3 Weeks Ago
badandy badandy is offline
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I hate those stupid valves. Or where they are mounted at least. GRrrrr. I still have a few to change and the tag one leaks bad.
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  #15  
Old 3 Weeks Ago
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Randy Dupree Randy Dupree is offline
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My tag axle has on dump valve,or i should say "had" one.
It now has 2.
The 2001 LXIs have 2,so i added one.
That took out a lot of the quirkiness i was having,it drives better with two.
The cross member in my 2000 was drilled for the 2nd one,a simple bolt in deal.
then add some air lines and done.
I think only having one on the tag would allow air to rush from side to side in turns etc.
Now i'm looking the front over,it may get 2 new ones as early as tomorrow,or even late today.
I'm thinking they act as a check valve from side to side,when you have 2.


In my quest to have the best driving LXI in the world!!
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2000 LXI 43
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Port St Joe Fl.
www.buybyebluebird.com

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