At work we have a John Deere 455 with the 3 cylinder diesel and well, it seems to have a problem. It only starts when it wants to. One day we started it up to move it out of the shed, go to put it back good 45 mins to an hr later and it doesn't start. It'll crank but wont fire. Then another day I got off of it not putting the break on and it died(safety switch on the seat). We go to start it back up and it doesn't start. Any ideas of what it could be? Sometimes it does it when its warm when its cold, dunno what its prob is, although I kicked it once and it started right up. Lol.

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I dunno to tell you the truth. It's an older one, and thats about the extent of it.

The JD455 uses a Yanmar diesel. You have an external electric fuel control valve between the tank and the injection pump. Under the seat is a safety switch that is connected to a small IC behind the dash, when that switch thinks no one is on the seat it will signal the IC to turn off the power to the fuel shutoff switch. That same IC is connected to the mower activation control switch, the PTO switch, and if you have a hydraulic option, to that too.

You have two solutions, troubleshoot the safety switches and the IC, then replace whatever is bad. Or, bypass the safety stuff and direct wire the fuel shutoff to the 12 volt ignition switch. Just remember if you bypass it is dangerous, and just like operating a tractor from back in the 60's.

I agree...the safety switch is your culprit.

Turned out to be a loose connection to the fuel shutoff valve. Thanks Guys.

Anyone know how to turn one of these puppies up and get a little black smoke goin?

Hi,

When the JD is not starting is the fuel pump running with the key on? Do you hear the click from the fuel shut off solniode and do you see movement of the arm on the side of the injection pump? If either of these are not working, check the fuses on the control boards under and behind the black screen behind the radiator for corrosion. At the same time pull all of the plugs out of the same boards and see if they are carotid at all also. You should also check the seat switch with the brake off and key on and listen for the fuel pump and injection pump to go on and off.

Please do all of these and get back to me.

Carter