Coach will not build air pressure - Printable Version
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Coach will not build air pressure - 360 - 05-14-2023
Was working on a few odds and ends today and went to move the coach and it will not build air. Thankfully I had a portable compressor so that I could float the coach to get it back into storage stall, but I'm at a complete loss as this is not something I've dealt with yet. Calling Newell in the morning to see what advice they have, but thought I would put it out here too.
Most recent things i've done to the coach is recently had to replace drive axle rotor, calipers, pads. Earlier today I realized my 120v compressor was bad as the shop that was doing my brake work let it sit there and run for hours on end while they had things torn apart...or at least that why I think it went bad. Sucks as it was a brand new compressor. I just never thought to shut that off when they were doing something like that as I figured there was check valve or something that would separate the system.
RE: Coach will not build air pressure - hypoxia - 05-15-2023
The first suspect is always the last thing a mechanic touched. Do the brakes work? Any air pressure on the gauges? Is it just the suspension that doesn't raise? Is the compressor putting out air? My air system may be similar so I attached a diagram.
RE: Coach will not build air pressure - bikestuff - 05-15-2023
I am kinda with Jim on this one.
The first thing that I would do would be to look at the gauge in the engine bay. With the engine running, it should build to 120 psi. The coach wont even start to lift at less than 90 psi. If it does not do that, it could be a huge leak, or the regulator has a problem or the engine compressor has a problem.
The air system on these coaches has quite a lot of volume, so if the air has been released due to maintenance, it will take a while to fill up and start building pressure.
Watch the engine gauge and make sure it is increasing (possibly very slowly) with the engine running. If not, start the troubleshooting.
For what it’s worth.
Bill
RE: Coach will not build air pressure - ccjohnson - 05-15-2023
You may also have a bad ppv (pressure protection valve).
RE: Coach will not build air pressure - 360 - 05-15-2023
(05-15-2023, 08:56 AM)ccjohnson Wrote: You may also have a bad ppv (pressure protection valve).
Sorry for the dumb question, but where would I look for that valve?
RE: Coach will not build air pressure - bikestuff - 05-15-2023
Above the drive axle.
Try this Thread.
RE: Coach will not build air pressure - hypoxia - 05-15-2023
I may be off kilter but I thought a PPV valve would just save that last 60 PSI for the brakes and it shouldn't affect the normal operation otherwise?
RE: Coach will not build air pressure - Richard - 05-15-2023
Talked with Brad this a.m.
The coach has been driven a couple of times since the brake work. The engine compressor builds zero air. He is investigating governor then air dessicant blow off valve.
RE: Coach will not build air pressure - Fulltiming - 05-15-2023
He would likely hear it but I had the line from the compressor to the filter blow out resulting in NO air pressure getting into the system. Of course the governor could cause that also without all the noise in the engine bay.
RE: Coach will not build air pressure - 360 - 05-16-2023
(05-15-2023, 07:06 PM)Fulltiming Wrote: He would likely hear it but I had the line from the compressor to the filter blow out resulting in NO air pressure getting into the system. Of course the governor could cause that also without all the noise in the engine bay.
Thanks. My mechanic is coming by in the bit to help me trouble shoot. Replaced governor yesterday and that was not it. First step I think it we're going to disconnect line from compressor at the dryer and we'll see if we're making pressure there.