I have a pc128us-2 Komatsu excavator. I'm having trouble with the thumb. Seams when I first start the day it works well. But after a while it just stops, Then after some time it will start working again. It almost seems like a relay but I don't know how to check because I don't have a book. Has anyone else had this problem? excavator
You need to attempt troubleshooting to determine whether you have a hydraulic or an electrical problem. Does it just stop working all of a sudden or does it get slower and slower and finally just quit? Are you doing anything to get it working again, or is it just sitting? Is it a thumb control or foot control?