DK40HST Won't Start.

   / DK40HST Won't Start. #11  
If your lights are coming on and then you have no sound at all then one of your safety switches are out, unplugged or not in neutral. There might also be a starter relay behind the firewall.. those tractors are touchy with being jumped off by the starter and can cause electrical issues
 
   / DK40HST Won't Start. #12  
Does that model have a switch on the seat? there should also be a neutral switch on the clutch
 
   / DK40HST Won't Start. #13  
Keep in mind the cruise module has a history. Some percentage of the cruise modules have a temperature related issue.
 
   / DK40HST Won't Start.
  • Thread Starter
#14  
I am jumping at the connector for the start relay. Where is the start relay coil? I will check that also. Thanks for the input.

Nick
 
   / DK40HST Won't Start. #15  
Does that model have a switch on the seat? there should also be a neutral switch on the clutch

There is no seat start switch, and there is no clutch on this tractor.
 
   / DK40HST Won't Start. #16  
I am jumping at the connector for the start relay. Where is the start relay coil? I will check that also. Thanks for the input.

Nick

Look at these pictures. and get back with us.

cranking system HST.JPG3 relays on firewall.JPG
 
   / DK40HST Won't Start. #17  
There is no seat start switch, and there is no clutch on this tractor.


Right not actually a clutch but a brake lever on the left that does have to be pushed in to crank the tractor right?
 
   / DK40HST Won't Start. #18  
Right not actually a clutch but a brake lever on the left that does have to be pushed in to crank the tractor right?

Negative, there is a 3 range selector on the left that has to bee in Nuetral for a start to occur. It has a bellcrank on it that rotates a potentiometer that has +5 volts on one side of the pot and ground on the low side. The wiper of the pot that is connected to the bellcrank then sends a varying voltage to the cruise module. The cruise module detects that voltage and decides what position the range selector lever is in. If it is in one of the 2 neutral positions, it will throw a ground out to the low side of the start relay thru a diode.
 
   / DK40HST Won't Start. #19  
Ok so the switch is on the range selector. Is it a standard grounding switch that has a button the lever pushes down when put in neutral? pretty common for these type switches to go out.
 
   / DK40HST Won't Start. #20  

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