ok yall please no rude comments im a lady thats been logging for 18 years now .i have a 76 white road boss 290 cummins ,im learning to work on my truck about a month ago hauling a load to sawmill and i lost all air pressure i down shifted got stopped finally.left truck over night came back next day started up air pressure built upmade it to mill unloaded same thing happened again borrowed air compressor shot air into tank got truck home.so far i have changed the air dryer, purge valve, air governor and it simply wont build air pass 60,checked all line with soapy water,can yall help me out on this .
