Hi, Welcome to Just Answer
I have 2 sullair compressors on a 495 shovel that won't hold air
Do you hear any leaks at all?
it seems that all lines are secure....
What is the air building up to
it was topped out @ 125psi
Alright, how fast does it lose the air
Are you still there>
yes, asking the night
it was called down during production, found a lube room door left open
closed door and adjusted psi
called back down about 1/2 hr later
So everything is good now?
adjusted again to 125 psi
No, the compressor was changed out, but this is not proper root cause
looking for some areas to trouble shoot next time, rather than change parts
Im going to opt out of this. This is not my area of expertise. I will leave this open for another expert to help you.