KEY SWITCH WON'T STOP MACHINE AND THROTTLE DOESN'T WORK ENGINE RUNS AT A CONSTANT SAFE SPEED
312 CAT A GREY MACHINE
i DON'T KNOW HOW THIS WORKS
Start with make, model, and serial number.
Welcome to Heavy Equipment Forums, Ronnie. I've moved your other two posts to this thread. Unfortunately, the forum doesn't work in real time. When you make a post, people have to come along and read it, and if they can help, they can post a reply. It can take some time. Hopefully somebody can help you get this figured out, if you haven't already. Also, posting in all CAPS is considered "shouting" on forums like this. Please just use conventional capitalization. Thanks.
Throttle actuator need replaced or the wiring or the calibration most likely needs a new one and calibration
Check fuses the big cats use power to shut off its worth a look