JCB Backhoe will not crank over!!

MF1105

New User
JCB 3CX will not crank over, the F-N-R switch, e-brake, ignition switch, starter relay all check out good. Also replaced the battery.
 
I don't know what all you have already checked but here's where I would start. Have you checked/tested the starter? Does everything else have power? Does it have a good ground from the battery? Are the fuses good? If you have or can get a wiring schematic that would help a bunch, get a test light and start checking.
 
What year or build is your machine,I usually disconnect the buzzer in tracing that kind of fault,can you hear the relay click when you hit start if so next check that the exciting wire on the starter solenoid has 12V when start is hit if ok either the starter/solenoid has an issue,did you try starting it by crossing the starter,make sure its out of gear and the shuttle in neutral.
AJ
 
I crossed the starter and it will turn over but what ever is going on will not cut off the fuel shut-off.
 
The 3cx was built from 1981 up to the present and there can be lots of differences like engines/shuttles/power shift and servo levers etc,did you pull the wire from the pump solenoid to shut the engine off?,that wire should have no power when the key is off if it has the dash lights would also be showing and the buzzer going,that would point to a faulty ignition switch or a loom fault,don't go changing wires about as they are all in the right place and don't move on their own,see if the engine stops when you take the wire off the pump and come back.
AJ
 

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