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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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  #1  
Old 10-18-2013
Ramz Ramz is offline
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Location: York
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Default high air pressure

Hi,
Coming home last week the last couple miles or so after I got off the interstate I heard quite a loud release of air every 30 -45 seconds, air pressure was reading 150psi front and back with the air release keeping it at 150psi. I let it release a few times shut the bus down. Released some air with brake pedal, dump suspension worked -it usually takes a day or less to empty. I scan the gauges regularly I don't think the pressure built up til I was almost home. Started bus a couple days later it aired up and kept going past 120psi to 150psi same air release every 30 secs or so, drove it around the block a few times stopping and releasing air with the brake pedal. Parked it and hit the dump susp. rocker and now it would'nt work (dash red light bottom center did'nt go on and the bus was still high the next morning). At first I thought maybe it was air compressor governor, but then the suspension would'nt dump-is it a bad dump valve? I don't plan on fixing this myself, but I'm wondering could a bad governor restrict the susp dump from working? Main question is would driving 20 miles to the repair shop with the air going up to 150psi and releasing and keeping it at 150psi cause something like a bag or line, etc. to burst? (can I release the air any way while driving besides the brake pedal, I would have to stop often to do that) or it's just not worth the chance and just get it towed.
Thanks for any input.
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Jim & Joni Ramsay
York, Pennsylvania
90 SP36
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Old 10-18-2013
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Bill Pape Bill Pape is online now
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there is a safety 150 psi valve usually on the dryer, sound like the pressure is too high, I would try to adjust the governor to a lower pressure to drive, or better to replace it.
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1988 FC, Silver Edition
Commerce, Michigan
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  #3  
Old 10-18-2013
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giderich giderich is offline
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Change the Bendix D-2 governor...immediately. Bill is spot on.

http://www.ryderfleetproducts.com/ha...-p-u55-kn18530

Put on a new D-2 governor instead of reconditioned.

On your SP the D-2 is probably mounted on the Tu-Flo Compressor. If I am wrong, Rick, Mark, Woody or anybody with a SP can verify.
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Dick & Patsy Gideon
1999 43 LXI Single Slide Body # F124510
2005 JEEP Liberty Limited CRD (diesel Toad)
SOLD 89 FC in 2012; SOLD 88 WB in 2016
Rolla, MO 65401
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Old 10-18-2013
Don Meyer Don Meyer is offline
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Paul,
I had a similar problem a while back. My air would reach near 140. I used the same methods you did to release the preasure. (break pedal, etc)

Terry Angelino, a first class diesel mechanic from NV suggested I get about a tablespoon of Mystery Marvil oil into the air system. Suggested it was a sticky governor. I followed his advise...problem solved. No problems for over a year now. And I did not have to pay $100 plus per hour to fix it!

Do you have a schrader valve in the engine compartment for airing up your system from on outside air source?
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Pop Pop's Bus
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  #5  
Old 10-18-2013
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Mike Hohnstein Mike Hohnstein is offline
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I had the same deal, changed compressor gov, didn't fix, replaced dryer with a fresh reman, same deal. Ran new 1/4" lines from tank and dryer to compressor gov, fixed it. Original lines on my FC are copper buried in the frame rail, replaced with plastic and push on connectors. My leaks were from the flexible rubber hose that runs from the frame rail to governor. Too much of a hassle to access, ran from dryer and tank along transmission over top of engine to governor. New line wrapped in abraision sleeve, times like this the exhaust blankets make life easier. I use MMoil regularly.
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  #6  
Old 10-18-2013
Ramz Ramz is offline
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I appreciate the quick help, I'll put in the MMO I had read something about that before didn't think about it til you mentioned it. I was planning on a new governor that's what I thought originally but the suspension dump quitting got me thinking it was more. I hope the MMO and governor does it, that'd be one of my cheaper fixes that's for sure. I got quite a few spare and new parts with the bus when I bought it including air dryer and filter. I'm not sure I can change them, I'll see when I open up the back hatch but if not that'll be done next time it goes into the shop seems the right time. I'll check back in with results after the fix. Thanks again
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90 SP36
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  #7  
Old 10-19-2013
Bob Johannesen Bob Johannesen is offline
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Default D-2 governor

I relocated my D-2 governor lower on the frame so I could service it or replace it without having to acquire 3 elbows and four thumbs!


.
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1991 WLWB "Seldom Blue"
1978 FC "Smell The Roses Now" SOLD...Costa Rica
Argyle, Texas
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