We have a 2001 ch613, at work. It’s been our spare since updating the fleet. Still use it to pull our detach lowboy when needed. Recently it’s been really slow to build air. Like 9-10 minutes to build 120 psi idling if it sits a while and tanks are empty.Maintains air well once built up.Is there any check valves in or around the tanks ? Just trying to eliminate anything being blocked or a check valve malfunctioning. Unloaders in compressor are functioning and not stuck .Earlier this year the truck had a new air compressor , governor, drier, and braided discharge line. No leaks in system and drops about 10-20 psi of air overnight. So this may be a stupid question but is the primary and secondary suppose to build air at the same time ?? I swear when we ran it everyday it would build primary tank up first then secondary would begin to fill like most trucks I’ve driven. Idk maybe that’s just me overthinking the situation/problem lol. Have not checked the output of the compressor itself but may be the next step. Ugh Id hate to have to change it being it’s only got maybe 8 trips on it .
