DK40HST Won't Start.

[Navasot]

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

 

[Navasot]

Does that model have a switch on the seat? there should also be a neutral switch on the clutch

 

[k0ua]

Keep in mind the cruise module has a history. Some percentage of the cruise modules have a temperature related issue.

 

[Nick61]

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

 

[k0ua]

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.

 

[k0ua]

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.

 

[Navasot]

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?

 

[k0ua]

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.

 

[Navasot]

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.

 

[k0ua]

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.

View attachment 398077View attachment 398078

To directly answer your question, the start relay coil is inside the enclosure of the start relay. The first relay on the left on the firewall as you look towards the seat while standing near the engine.