Not logging related, but construction / excavating wise, yes, we have had issues with machines at extreme altitudes.
Projects on top of Pikes Peak, over 14,000ft, we had all sorts of derate / emissions issues. Some machines would only make it a day or two and go down. Others would do fine, but it is very demanding work at that altitude, even on your body. The mechanics would come up and try to fix stuff, but it wasnt uncommon for them to get altitude sickness or just be extremely fatigued.
All the major repair shops are 5-6500ft near Denver or Colorado Springs, so a machine needs to be prepped for high elevations at times. Same goes for the old mechanical ones; Cat had different specs for timing and fuel rates, etc back in the day right on the machine.