crane operator
Senior Member
Took the lowboy to a job the other day, parked it while I worked, and then when I started it up, it wouldn't build air past 40 psi.
Bled off the little air it had built, started it up again, and it built quick to 40 and then stopped. I grabbed a hammer out of the crane and gave the governor a little love tap or two (I'm that kind of mechanic) and one more try of bleeding off the air and building back up and it was fine, took off for 125.
I got around to looking at it this afternoon, and replaced the governor and it didn't change, did the unloader valves in the compressor next and it hasn't changed. I put shop air to the tanks and then it was fine, would build air up okay. I bled it off a couple times and it built back up fine on its own.
I'm now thinking I've got a check valve somewhere or the air dryer is somehow messed up. Not sure where to start looking next though? It does sound like the compressor is making air, and it is fast to 40 then just stalls out.
Bled off the little air it had built, started it up again, and it built quick to 40 and then stopped. I grabbed a hammer out of the crane and gave the governor a little love tap or two (I'm that kind of mechanic) and one more try of bleeding off the air and building back up and it was fine, took off for 125.
I got around to looking at it this afternoon, and replaced the governor and it didn't change, did the unloader valves in the compressor next and it hasn't changed. I put shop air to the tanks and then it was fine, would build air up okay. I bled it off a couple times and it built back up fine on its own.
I'm now thinking I've got a check valve somewhere or the air dryer is somehow messed up. Not sure where to start looking next though? It does sound like the compressor is making air, and it is fast to 40 then just stalls out.