Compressor/Pump Kicks On Every Two Minutes?? Is This Normal?

[Pigman1]

Good for you. If the Air Drier hasn't been serviced in the last 2-3 years you might pull it down and check the filters there. I had an Allegro Bus on a Freightliner chassis that had the air pump blowing a lot of oil past it's rings. It showed up in the drier before it contaminated the system, and I caught it on a periodic maintenance. (I do my own maintenance) Freightliner had to replace the air pump, but everything else (including the 7 point check and tank drain for water) was OK. When I've replaced the air drier cartridges my kits have never had the valves included so I've never replaced them and we're at over 110,000 miles now. Something to consider, though.

[ru499]

Could be the air dryer but could also be the air compressor governor on the engine. The pressure should not be more than 125-130#.

[twinboat]

Originally Posted by ru499

Could be the air dryer but could also be the air compressor governor on the engine. The pressure should not be more than 125-130#.

The post is from March and all is OK now.

[jporietis]

I just solved a similar problem. When sitting still my air pressure held steady for a long time, even overnight. While driving my rear tank air pressure dropped often, maybe cycling the compressor every minute or so.
I replaced my rear air bags and now the compressor cycles every 3 to 5 minutes while driving. The old air bags were badly checked, cracked especially where they are folded around the mount.
I am guessing the worst cracks were covered by the mount when sitting still.