8 hours ago
Wow, thanks all for this help.
Realizing I have leaks to resolve, I still want to make sure I understand the system. I understand the PPV will shut off to protect air to the critical systems. But, assuming chassis air doesn't drop to 60, then in theory it should stay open and still supply air?
One thing Richard mentioned which I didn't think about was the check valves at the primary and secondary tank, which would then suggest I could have gauges for those tanks reading high but no other air in any other system (unless 120v compressor turns on).
The pneumatic diagram is fantastic, thank you for that! I'm going to try tracing my coach and compare the diagram and then print it for quick reference.
It appears my Thomas compressors are hooked to a coil for cooling and then they go straight to the filter/water separator Jim mentioned. After the separator there is what I assume to be a pressure switch, followed by a manifold which has the gauge installed on the manifold. I'll have to trace where that manifold goes outside the compartment, assuming the leveling tank, and see if there's a check valve there.
While spending a few minutes today looking at it, prior to seeing your responses, I did locate a small leak at the door air release inside the front left compartment, and then found a larger leak on the curb side middle bay manifold that distributes to a bunch of solenoids. The manifold itself has a shutoff valve built-in, and that's what appears to be leaking. I'll take it apart and see if I can rebuild it with some new seals.
I'm sure there's a bunch of other leaks but your insight will help educate me on the systems. Nothing like troubleshooting details without understanding the higher-level concept!
Realizing I have leaks to resolve, I still want to make sure I understand the system. I understand the PPV will shut off to protect air to the critical systems. But, assuming chassis air doesn't drop to 60, then in theory it should stay open and still supply air?
One thing Richard mentioned which I didn't think about was the check valves at the primary and secondary tank, which would then suggest I could have gauges for those tanks reading high but no other air in any other system (unless 120v compressor turns on).
The pneumatic diagram is fantastic, thank you for that! I'm going to try tracing my coach and compare the diagram and then print it for quick reference.
It appears my Thomas compressors are hooked to a coil for cooling and then they go straight to the filter/water separator Jim mentioned. After the separator there is what I assume to be a pressure switch, followed by a manifold which has the gauge installed on the manifold. I'll have to trace where that manifold goes outside the compartment, assuming the leveling tank, and see if there's a check valve there.
While spending a few minutes today looking at it, prior to seeing your responses, I did locate a small leak at the door air release inside the front left compartment, and then found a larger leak on the curb side middle bay manifold that distributes to a bunch of solenoids. The manifold itself has a shutoff valve built-in, and that's what appears to be leaking. I'll take it apart and see if I can rebuild it with some new seals.
I'm sure there's a bunch of other leaks but your insight will help educate me on the systems. Nothing like troubleshooting details without understanding the higher-level concept!
Taylor and Katie Hill
2009 Coach #1288 - Valid Slides and Valid Levelling
Cat C15 w/Allison 4000