Air dryer purge every 40 seconds

Ed Manifold wrote:
I have a question about air dryers? I am not trying to high-jack the original post so please excuse me. I always thought the the air dryer was a piece of equipment that could be removed and rebuilt. Approx. 1 1/2 year ago I had my air dryer serviced and the air dryer was a large canister very similar to an oil filter only larger in diameter.The mechanic bled all the air from the system and unscrewed the old one and installed the new unit. I have the old unit in the garage. The price of the new air dryer was approx. $240.00. I would think that next time I could change it myself. The mechanic said the key is to purge the air system well.

Yep you can do it, just purge all the air out of the system. Mine had three lines and 4 bolts. Rebuild it and replace.

I have a question about air dryers? I am not trying to high-jack the original post so please excuse me. I always thought the the air dryer was a piece of equipment that could be removed and rebuilt. Approx. 1 1/2 year ago I had my air dryer serviced and the air dryer was a large canister very similar to an oil filter only larger in diameter.The mechanic bled all the air from the system and unscrewed the old one and installed the new unit. I have the old unit in the garage. The price of the new air dryer was approx. $240.00. I would think that next time I could change it myself. The mechanic said the key is to purge the air system well.

Yep, replaced the valve inside the airdryer, works perfectly.

Found the turbo valve busted inside the air drier. Only 6 mo old.

Well after the deed I described, the air sound was not coming from the compressor or unloader diaphram. I found it using a mechanics stethoscope, it was coming from the air dryer I rebuilt in January. I will keep ya posted on my results.

MountainAir05 wrote:
If your system had a weak unloader, you can check it out pretty easy by

appling shop air to the RV while it is not running so the governor is in cutout mode and is allowing air to the unloaders. If they are leaking you can usually hear or feel it blowing back out the intake of the compressor.

Doug might drop by in a few and correct us all.

I applied 130 to the system, the purge would not stop till I lowered the pressure lower than 95. after it purged I could barely hear a leak close to the compressor. I'm sure all the lines are leak free.

MountainAir05 wrote:
If your system had a weak unloader, you can check it out pretty easy by

appling shop air to the RV while it is not running so the governor is in cutout mode and is allowing air to the unloaders. If they are leaking you can usually hear or feel it blowing back out the intake of the compressor.

Doug might drop by in a few and correct us all.

So air up the rv till it unloads the compressor while the engine is off
?

If your system had a weak unloader, you can check it out pretty easy by

appling shop air to the RV while it is not running so the governor is in cutout mode and is allowing air to the unloaders. If they are leaking you can usually hear or feel it blowing back out the intake of the compressor.

Doug might drop by in a few and correct us all.

We experienced a similar issue a few years ago, but the release was intermittent. Replaced the air dryer, and didn't occur again. Good luck.

eHoefler wrote:
Most likely the pressure relief valve popping off, the regulator on the compressor is bad

replaced