Air dryer purge valve leaking

This purge valve would get stuck in the open position which then would not allow the system to build and hold air properly. Check the air line from the Air governor to the dryer. If it s foaming or bubbling up replace the line.

Spray it down with 4or soapy water especially if it s a wire braided line. It will loose down to psi in about minutes, and is completly depleted in about hours. Constant exhaust of air at air dryer purge valve exhaust when air dryer is in Charge mode. Has no audible air leaks this even has the Mack techs in Richmond Va scratching their heads, I have replaced every major component and it stll wants to build up to 1psi then purge until psi drops to 1or so then the purge valve shuts off and the cycle repeats.

I worked my way beneath it (fat guy, not easy) and it s exhausting air at what I suspect is a purge valve on the dryer body. The dryer cycles as it should per Meritor manual.

Anyway, the other day, I started the engine and it wouldn t build air pressure (but the ear splitting alarm in the cab was certainly doing it s job). I also replaced the Governor on top of the air compressor but the drier still leaks air. When you start the truck, air builds to 1psi no problem and no leaks.

If it s leaking it will cause this. On a Bendix dryer it will make it purge continually. Bendix ADAir Dryers - m Constant exhaust of air at air dryer purge valve exhaust when air dryer is in Charge mode. After the system purges, there is a slow but steady air leak from the purge valve.

Then leak developed behind dash and I replaced the red supply valve. The problem is that the air dryer continues to leak air at the purge valve down to 1psi in about seconds and then it stops.
Air dryer purge valve leaking excessively Compressor fails to unload (stop compressing air) and air dryer purge exhaust makes sputtering or popping sound Purge control line connected to reservoir or exhaust port of governor.

Shut the truck off and it still leaks. When the air fills up to 1psi the compressor kicks off like it should. Now it s back to leaking out the bottom of the drier again. I replaced the air dryer and the air governer and it continues to leak at the purge valve. I change the purge valve, but that didn t help. dust hose eBay Find great deals on eBay for dust hose.

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