Re: Air System Governer Question
Reply #5 –
As I understand the air system, the D2 governer located on the compressors kick in at low pressure, out at high, and allows the compressor to restart under no load conditions. When mine started failing, it was not kicking out, and allowing too high of pressure to show on the gauge, and both needles (above the setting of 125#). I replaced mine, and bought a second as a spare, as they are about $35 for rebuild units, and about the size of a frozen juice can to store and carry.
You mention two different pressures showing on the dash gauges, one is for the front and one the rear brake systems. Sure don't think the governer could cause that sort of problem. As they are cheap, sometimes not hard to replace, why not? But I would be surprise to see that fixes anything. Study of the air system diagrams, shows lots of connectors, valves, check valves, and parts to the coach. Add to that the whole separate air bag system, you have lots of parts.
Interesting to read that John found dryer dessicant from a faulty air drier in his. I thought the air goes to the dryer, was always under pressure. But there must have been a faulty check valve to allow back pressures back thru the dryer. There are check valves to not let the air system loose pressure once it is in the wet or dry tanks. There are many check valves to keep the two brake systems apart, so that you would always have at least front or rear brakes even when the other system is leaking off, even if it is the air bag system.
Topic: Air System Governer Question