I’ve got a hitachi 450 lc3. The other day it didn’t want to shut off with the key. So I used the switch under the seat. Now I cannot get the key switch to work at all to shut off the machine. And the monitor stays on. So the battery goes dead. Also I now have no hydraulic flow, machine has all the power just no speed. All happened at the same time. I replaced the ignition/key switch hoping that would help. Nope.
With the monitor on, ground the Blue/Yellow wire that is on the back of the alternator to a good ground. Did the monitor go out?
No it didn’t do anything. So when I fire the machine up first thing after it going dead, I immediately have speed and power in the hydraulics. But within 15 seconds all my speed goes away like a switch is shut off
So the engine does not die, you just lose throttle control?