need draining air tanks advice.

Google is your friend.

 

Back in the 70's early 80's I used to drain all the air tanks at he end of the day, but no more, not for years.

 

That's what I used to do...maybe twice a day if the weather was really cold , but never more than that.

 

In the last 6 years I've had to drain my tanks once and that was when my air dryer went out so they bypassed it until I got back to the shop.

 

I quick tug on the valve line, and if there's no water mist, then your good. I check mine just to make sure the air dryer is doing its job, after a rainy day.

 

By the way you should be able to hear your air dryer purge... or spit ...

 

I check my tanks once a week for moisture. Pull the cable....no moisture no drain!

 

Engine derate is EPA requirement for making our planet safe .

Engine derates to 55 Mph and then to 5Mph due to 1) No DEF in the tank or 2) Poor DEF quality or 3) Tampering with the SCR system.

 

Or clogged DPF (Diesel Particulate Filter).

Mikeeee