Quarry's not working right

Also, how would I repair my quarry, it's showing as 3/4 low on health

Logged out and back in. Still not working, and says it is at 8/5. It runs till it gets ore and quits. Also it shows a lot of damage and I have no idea what I need to do to repair it.

Thank you, I didn't know it took damage as it ran but watching it go down as it runs now. But I still need to be able to upgrade it. I bought another quarry this morning and can't place it. Anyway, thanks boss!

Ty. Got it. Good thing I remember where I pulled my other quarries out of the ground. Thanks again boss !
Quick response and great work.