Help with Air Compressor on CAT C15

It can be leaking safety valve.... But I replaced a few to find out later that check valve on my AD-9 air dryer was defective not allowing air to flow from the air dryer to a wet tank...

 

do you remember the part number? Mine is also leaking.

 

The check valve on my c15 cat was spiting air out of it so I replaced it and it work for about an haur and it stated spiting air out of it and wont build up air is it just another bad check valve

 

I have a c15 cat its spiting air out the top of the copresor so I replaced it and it worked for about an hour and it started to spit air out of it could it just be another bad check valve

 

Do you mean the unloader valve that's held in the head with two screws or the brass safety valve that pops off at high pressure?

 

Safety valve that pops off at high pressure

 

Safety valve that pops off at high pressure

 

Is your truck building to much air pressure? It shouldnt pop off if your governor and unloader valve are working correctly and cutting out your air compressor. And make sure the valve is rated for the right pressure, it should be printed on the side.

 

Well thankyou verry much I'm going to go check that out right now thanks again

 

What type of an air dryer do you have on your truck?