Plowboy Posted May 13, 2017 Share Posted May 13, 2017 I recently bought a 1985 RW with the E9. The air compressor seemed to run continuously, and the relief would blow down air. I adjusted the governor so it bypasses at 120 lbs by the gauge. With the truck running at 1000 RPM, when the governor bypasses, within 50 seconds, the pressure will be down to 100 lbs, and the compressor will pump back up to 120 lbs. in about 45 seconds. Then this cycle continues. I can hear no air leaks when the truck is running, and there are no leaks or loss of air pressure when I shut down the engine. Is this normal? If not, is it the governor, or something in the compressor? Quote Link to comment https://www.bigmacktrucks.com/topic/49821-air-governor/ Share on other sites More sharing options...
Lmackattack Posted May 13, 2017 Share Posted May 13, 2017 sounds like a bad check valve in the compressor? or you have a bad air leak but you would be able to hear that. also check the air drier is not stuck open after it spits . Quote Link to comment https://www.bigmacktrucks.com/topic/49821-air-governor/#findComment-369718 Share on other sites More sharing options...
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