03-12-2017, 05:11 PM
You could loosen carefully the line from the engine compressor to see if it is pumping, just cracking it will tell you what you need to know. If it is pumping, then either the dryer is dumping or you have a blockage somewhere. If it isn't pumping then the governor should be checked out. If the compressor has been operating fine the likelihood it choose this moment to completely die is small though possible. I would have to look at a manual for the governor to figure out how to test it.
If the dryer isn't dumping and the compressor is compressing, we then need to narrow our search for blockage. After the engine has run for a bit do any of the gauges show any pressure. If "no", then air is stopped somewhere between the inlet to the dryer and the inlet to the supply tank. I would then crack the line out of the dryer. This will tell you whether the blockage is upstream or downstream of the dryer discharge.
If one gauge doesn't come up then there is blockage in the supply to that one. I would then check out the valves, check or pressure protection, feed that sysrem.
If the dryer isn't dumping and the compressor is compressing, we then need to narrow our search for blockage. After the engine has run for a bit do any of the gauges show any pressure. If "no", then air is stopped somewhere between the inlet to the dryer and the inlet to the supply tank. I would then crack the line out of the dryer. This will tell you whether the blockage is upstream or downstream of the dryer discharge.
If one gauge doesn't come up then there is blockage in the supply to that one. I would then check out the valves, check or pressure protection, feed that sysrem.
Jon Kabbe
1993 coach 337 with Civic towed