2010 DK40 SE Won't Start

TimbourLarry · Oct 21, 2013

Thanks for all your responses and I'll try to answer the outstanding questions. Just to be sure that we are all on the same page the relay I replaced is the starter relay 30. in the picture James sent on page 4 which is on the far left or the 3rd relay to the left of the display unit. The stop relay in the picture is next to the display unit. I also have 2 stop solenoids (SS) as I got a new one when I incorrectly diagnosed the problem as the SS when the tractor would not start and I've tested both and neither work now but I haven't yet plugged the starter relay wires into the stop relay to see if that still works, but the engine cranks fine just not start. since I know longer have a Kioti dealer in the area I ordered the relay over the internet and I'm wondering if you guys know if a Mahindra, Kubota, JD would have a similar 5 prong relay that would work. I hope I've answered your questions and thanks again.

k0ua · Oct 21, 2013

TimbourLarry said:
Thanks for all your responses and I'll try to answer the outstanding questions. Just to be sure that we are all on the same page the relay I replaced is the starter relay 30. in the picture James sent on page 4 which is on the far left or the 3rd relay to the left of the display unit. The stop relay in the picture is next to the display unit. I also have 2 stop solenoids (SS) as I got a new one when I incorrectly diagnosed the problem as the SS when the tractor would not start and I've tested both and neither work now but I haven't yet plugged the starter relay wires into the stop relay to see if that still works, but the engine cranks fine just not start. since I know longer have a Kioti dealer in the area I ordered the relay over the internet and I'm wondering if you guys know if a Mahindra, Kubota, JD would have a similar 5 prong relay that would work. I hope I've answered your questions and thanks again.

I am confused by your reply here. Why are you replacing the start relay (30 in the photo) when you know the engine will crank? That relay must be functioning or the engine will not crank. But since it does crank, it is good!. You need to try replacing the stop solenoid pull coil relay, or test it by substituting the start relay wiring onto that relay to see if the engine will crank. This would test the functionality of that relay. If it is good we need to look elsewhere for our problem.. lets go over again how the stop solenoid and the relay that drives it works. The chain of events begin with the 1 second Ground pulse that comes out of the Display unit on connection point 33. This is connected to the low side of the stop relays coil.. again the connection point is labeled 33 on the schematic. The high side of the coil is on the positive ignition key connection. So the coil energizes, the contacts pull up for the one second (thru the 25 amp fuse)and this energizes the big high current of the pull coil inside the actual stop solenoid on the front of the injection pump. Now that the pull coil is pulled back for that one second, the hold coil that is energized by the ignition key will take over keeping the stop solenoid pulled back thru its low current "hold" coil.. This is fed thru the 10 amp fuse labeled "alternator/engine stop". There is also a diode shown near the stop solenoid on the schematic, its purpose is to suppress the "back EMF" that is generated when the coil de-energizes. If that diode was shorted It should blow that 25 amp fuse, or at least burn up the contacts of the stop relay and still blow the fuse.

So your mission is to determine does the 1 second ground pulse come out of the display unit? and pull the coil of the stop relay( third one from the left) Does it contacts pull up and supply the 1 second of high current thru the 25 amp fuse to the pull coil of the stop solenoid?, and is the hold coil energized from the ignition switch?. Lets go over what you said you know for facts: You state the engine will crank, there the start relay and all related circuitry is good. You state the engine will start and run if the stop solenoid is pulled back, but obviously the stop solenoid is not being pulled back for some reason. We need to find that reason.

James K0UA

Coyote machine · Oct 21, 2013

Don't confuse your issues further by swapping parts to the Kioti from another tractor. Follow what James outlined above, and let's get you rolling.:thumbsup:

TimbourLarry · Oct 21, 2013

James, eureka that was it!! I had mistakenly read a post about the 3rd relay from the right side and replaced the starter relay which was ok instead of the stop relay which turned out to be defective-rookie mistake. At any rate I changed the stop relay mounted the SS turned the key and heard the SS click and then the beautiful purr of the engine ...finally. Thanks for your patience and if I could I would send everyone an apple pie. Many thanks again!!

k0ua · Oct 21, 2013

TimbourLarry said:
James, eureka that was it!! I had mistakenly read a post about the 3rd relay from the right side and replaced the starter relay which was ok instead of the stop relay which turned out to be defective-rookie mistake. At any rate I changed the stop relay mounted the SS turned the key and heard the SS click and then the beautiful purr of the engine ...finally. Thanks for your patience and if I could I would send everyone an apple pie. Many thanks again!!

Hey we got ya fixed! Good deal!

Coyote machine · Oct 21, 2013

TimbourLarry said:
James, eureka that was it!! I had mistakenly read a post about the 3rd relay from the right side and replaced the starter relay which was ok instead of the stop relay which turned out to be defective-rookie mistake. At any rate I changed the stop relay mounted the SS turned the key and heard the SS click and then the beautiful purr of the engine ...finally. Thanks for your patience and if I could I would send everyone an apple pie. Many thanks again!!

Oh boy, an apple pie! Careful what you wish for. What's your address, I'll send you the pie mailing list!:licking:

Glad you got it fixed. Nice job James. Way to stay focused on the tractor at hand and the specifics of the issue.