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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 11-01-2019
clyndes's Avatar
clyndes clyndes is offline
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Default Air system issue on 3208

Folks,

Am on day 2 of journey west to HWH to see about getting a jack repaired. Currently at a rest area on I80 in Ohio.

Today I noticed that my air system is behaving differently. The air dryer spits at the usual pressure, then about 2 to 3 minutes later. after the pressure only going down a couple of pounds then going back up, it spits again. Usually it goes down at least 10 pounds before the compressor comes back on.

I have also heard a rattling on this trip that seems to be coming from the air dryer. It only rattles when the compressor is on. Not sure if this has any connection.

The air governor was replaced about 3 years ago. The air compressor was replaced 2 summers ago. The air dryer was rebuilt 2 summers ago.

Has anyone ever experienced this problem before?

The air governor has an adjustment screw that I believe is used to change the high pressure cut off. Does anyone know which direction is pressure up and which is pressure down?

As far as I know there is no adjustment for the low pressure setting. Is that correct?

I'm still able to drive it so I think I'll head out tomorrow after seeing if adjusting the air governor makes any difference.

Any thoughts or advice appreciated!
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'83 FC 35' SB "Bella"
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  #2  
Old 11-01-2019
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paulshuler paulshuler is offline
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Leaking hoses or loose filter on compressor? Leaking from Horton Clutch fan— requires 75 psi to operate.
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Rochester, MI
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  #3  
Old 11-01-2019
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Bill Pape Bill Pape is offline
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dash air gauges monitor the two brake tanks,
you probably have a leak in the suspension or accessories, or possibly the air dryer
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  #4  
Old 11-01-2019
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clyndes clyndes is offline
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Paul and Bill,

So I'm confused. When the pressure goes over Approx 70 I thought the valves that isolate the brake tanks no longer isolate them. If I really lean on the air horn I see the pressure drop on my gauges until about 70.

The pressure is varying between 125 psi and maybe 122, then the compressor kicks back on.

Still, will go leak hunting tomorrow.

Thanks!
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'83 FC 35' SB "Bella"
Colchester VT
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  #5  
Old 11-01-2019
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Randy Dupree Randy Dupree is offline
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It sounds like a bad check valve in the air dryer to me,making the pop off valve pop off.
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  #6  
Old 11-01-2019
ChrisRasman ChrisRasman is offline
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I'm with Randy.
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2003 Wanderlodge 40LX
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  #7  
Old 11-01-2019
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WanderScott WanderScott is offline
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Hi clyndes,

I've also had trouble with my purge valve purging every 2-3 minutes. It was an intermittent problem that also exhibited a "sputtering" from the purge valve between actual purges.

I ordered Part# 101900MKX by HALDEX, which included a freshly prepped desiccant cartridge in addition to the purge valve rebuild kit. After about an hour of straightforward work, I was rewarded with a nice crisp purge every 20 minutes or so.

If all you want is the purge valve rebuilt kit, without a new desiccant cartridge, you need Part# 287053K.

The check valve is Part# 287298K.

I also repacked my old desiccant cartridge as a spare for a quick service in the future. The desiccant refill kit is Part# 286718. I keep my spare desiccant cartridge and an extra purge valve rebuild kit in the bus now.

Here's a link to many of the parts:
https://www.finditparts.com/t/6716/c...bendix-r-ad-2/

Here's a link to the service manual:
https://www.google.com/url?sa=t&rct=...fZ47U1HJlCWzJZ

Let me know if I can help.
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  #8  
Old 11-01-2019
pauleburgess pauleburgess is offline
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I am also leaning towards the air dryer... Is it spitting gunk? Does that model run a line to the governor? If so gunk can leave it cracked open, calling for air.
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  #9  
Old 11-01-2019
pauleburgess pauleburgess is offline
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Quote:
Originally Posted by pauleburgess View Post
I am also leaning towards the air dryer... Is it spitting gunk? Does that model run a line to the governor? If so gunk can leave it cracked open, calling for air.
And also check that the spitter valve bolt is not coming loose. Btdt recently.
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  #10  
Old 11-02-2019
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clyndes clyndes is offline
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Folks,

Thanks for all the replies!

Check Valve - that would explain the rattling noise from the air dryer. It keeps air from flowing back to the compressor when the compressor is free wheeling?

Can I drive it like that? Have an appointment at HWH for Monday morning.

Having coffee and waiting for a little daylight in Ohio.
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