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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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  #81  
Old 08-25-2018
Alever Alever is offline
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Default Pressure protection valve.

Just going to tag on this old thread. I have a leaking PPV. Or that's what I think it is. I am on shop air while working on bus and have found this large leak from the center of this valve. It is above center of rear drive axle close to the air drier. This would explain why the on board air compressor cycles a lot when used and never seems to get up to pressure. I am just making sure I have the correct part found in the drawings. BB# 0522508
Thanks
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Allen and Sara Eversman
Wapakoneta, Ohio
93 WLWB
Had 81 FC35
937-407-0079
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  #82  
Old 08-25-2018
Bill Pape's Avatar
Bill Pape Bill Pape is offline
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Haldex # 31000,

Looks like a bit of plumbing to replace,
If you can find the exact replacement, the diaphragm & internal parts only can be replaced.
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Bill & Patty
1988 FC, Silver Edition
Commerce, Michigan
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  #83  
Old 08-25-2018
Alever Alever is offline
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I have a Cardinal Bus Sales (a big Blue Bird school bus dealer) a few miles from where I work. I will try them. They were listed as a Wanderlodge parts location in the old owners manual from my 81FC. I got nothing to loose and everything to gain if I don't have to take everything apart.
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Allen and Sara Eversman
Wapakoneta, Ohio
93 WLWB
Had 81 FC35
937-407-0079
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  #84  
Old 01-07-2019
JMorton JMorton is offline
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Default 88 PT Air and suspension problems

Shadow is not airing up the suspension system properly. The front end only rises about 2 inches when I try to air up. I have read most of the related threads and tried shutting down and then emptying the air system by pumping the brakes. Then I made sure that the suspension dump and tag switches were both in down mode and I started the motor. Brake air gauge built pressure acceptably and the gauge by the tank dump switches also indicated pressure building. (why is this not a dash gauge?) I switched the suspension to up, and the airbags started inflating, the rear rose several inches ( I have stands under the frame so it started out higher than when normally dumped ) and the front only rose about two inches. Reading the manual provided in the blue box makes me think it should rise about 5 inches.


When I shut down, the brakes hold pressure but the gauge by the dump switches goes to zero in a couple of minutes.


I think there are probably two problems - air leaks in the auxiliary air systems and a separate problem with the front leveling system.



I will appreciate any analysis of these symptoms and suggestions as to where to start looking ( I have read the various posts describing interesting air leaks and will act on that info ).



I think I understand the components in the air system, but will happily receive corrections to the following:


check valve - lets air flow in one direction only. If pressure is higher on outlet side, air can not flow backward.


pressure protection valve - only open when inlet side has reached a certain pressure, closes when it falls below a certain pressure.


I am trying to re-draw the wonderfully complex air / brake system drawing provided in my manual to show only the "active" components, not all of the various plumbing fittings used to connect things together. I do not have a good picture of my air system in my mind, so it is a little like wandering through a maze with no map. Any clues are welcome.


I am a bit hampered by cold wind and rain, it seems on any somewhat dry day, I am up to my ears in family obligations . I hope to be able to crawl under Shadow sometime this week and observe the operation of the air ride system.
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Antioch, Ca
1967 30FCSB "Retro Active"
1988 PT 40 "Silver Shadow"
88 Jeep Cherokee "Indy"
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  #85  
Old 01-07-2019
LDM680 LDM680 is offline
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Quote:
Originally Posted by JMorton View Post
...


I switched the suspension to up, and the airbags started inflating, the rear rose several inches ( I have stands under the frame so it started out higher than when normally dumped ) and the front only rose about two inches. Reading the manual provided in the blue box makes me think it should rise about 5 inches.

...

Is there any chance that, when you are on the stands with axles on the ground, the frame of the coach is higher than the normal ride height?

If so, then the height control valves will try to lower the frame by releasing air pressure to the bag(s), eventually lowering your air tanks to the pressure protection valve limit.
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1985 PT40
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  #86  
Old 03-03-2020
djcash djcash is offline
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Quote:
Originally Posted by Alever View Post
Just going to tag on this old thread. I have a leaking PPV. Or that's what I think it is. I am on shop air while working on bus and have found this large leak from the center of this valve. It is above center of rear drive axle close to the air drier. This would explain why the on board air compressor cycles a lot when used and never seems to get up to pressure. I am just making sure I have the correct part found in the drawings. BB# 0522508
Thanks
Quote:
Originally Posted by Bill Pape View Post
Haldex # 31000,

Looks like a bit of plumbing to replace,
If you can find the exact replacement, the diaphragm & internal parts only can be replaced.
Al, how did you make out with this? Mine is blowing out the center hole when on shop air also. When down on tires in normal operation it seemed to quit. We are close to taking off and heading south somewhere. Bill mentioned the part from Haldex 31000 but it's no longer available. The after market replacement seems to be KN-31000 and looks like it would allow guts only change. Your thoughts.
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1997 WB43
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  #87  
Old 03-03-2020
Alever Alever is offline
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Dale the new valve rubber diaphragm is a different size. I was able to take another one apart and trim the diaphragm to fit. It kept me from having to remove the piping to change it.
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Allen and Sara Eversman
Wapakoneta, Ohio
93 WLWB
Had 81 FC35
937-407-0079
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  #88  
Old 03-03-2020
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1984Lodge 1984Lodge is offline
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If you want to replace it, meritor makes a replacement:

https://www.finditparts.com/products...jozfQ%3D%3D%0A
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Jeff LoGiudice
Jeff@GinosGarageUSA.com
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1984 Bluebird PT40
#F063411 6V92TA & MT654CR
& 1986 MCI 102A3
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  #89  
Old 03-03-2020
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isp2952 isp2952 is offline
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Cheaper on e-Bay

https://www.ebay.com/i/274046480491?...BoCn0oQAvD_BwE
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2000 LX ME 2020 to Present
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  #90  
Old 03-03-2020
Alever Alever is offline
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Here are the pictures of the old rubber disc and the new direct replacement that I picked up from a local Blue Bird dealer. Notice the difference in the size. The old round one sits up in a slight recess to center it up and seal correctly. The new style just uses the screws for alignment. I just trimmed the new one up to fit since we were leaving as soon as I had it fixed.

The location and being plumbed in between two other devices makes changing the valve harder. It was still easier to make the rubber piece fit than tear it all out. Not easy but a good challenge.

Haldex 90555396. PPV 65PSI. Its is the latest revision part number that Blue Bird had listed last year.
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Allen and Sara Eversman
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93 WLWB
Had 81 FC35
937-407-0079

Last edited by Alever; 03-03-2020 at 08:24 PM. Reason: Added part number and picture.
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