What would cause the Mechatronic not to be reading the limit switch on the stepping motor? SK70 Gray Market SER# YT03 05617 Now the rest of the story: Some dumb operator (I know hard to believe) put a relay in place of the key switch fuse. Relay heated up and melted 3 wires in the cab harness. Now the mechanics head ache: Rebuilt & replaced wire harness. Found original stepping motor to be bad, limit switch was bad, replaced stepping motor. Found bad RPM Sensor, replaced. Replaced key switch, as a just in case. Machine will not take the A adjustment. Stepping Motor goes to the high accelerator position but will not go back to the stop position on the first step of the A adjustment. Have checked and triple checked that all cab wires are good and going to the right pins on the controller. Had a buddy who knows these Kobelco's pretty good come spend some time on this machine with me. Took new stepping motor & mechatro controller over to buddies shop and checked on good machine. My motor & controller are good. We were thinking limit switch wires. Pulled engine wire harness and checked wires. Cab to engine harness a bitch to pull but all my wires are checking out good on ohms and not grounded to other wires. Re-checked cab wires :dizzy ointhead:dizzy Any ides what we are missing??? Shot me any ideas here.
Up date: Stepping motor wont read the limit switch. I have pulled the 4 pins from the Mechatronic plug #14-1 Green; 14-2 Black; 14-3 Gray shielding Ground; 14-12 Red; 14-13 white and ran my own shielding wire to the stepping motor and still nothing. I have by passed 14-14 purple power and separate black ground wire to the limit switch in the same way The Stepping Motor is new, The RPM Sensor is new. I have taken it and my computer to another machine and plugged them in and they work fine. I brought a good Mechatronic to my machine and still won't take the A adjustment. The stepping motor goes to one side of the limit switch but does not kick back the other way, just sits there and clicks. ANY IDEAS??????