DK40HST Wont turn over

[Nick61]

I was working on the property today with my brand new tractor. I shut it off to do some things. Got back on turned the key and it wont turn over. I tried shaking the shift lever, made sure the PTO wasn't on, the shifter is in neutral, but nothing. I called the dealer. They sent me some diagrams to see if I can troubleshoot it. dealer is 180 miles away. Anyone else have any thoughts? I won't be able to work on it tell Thursday. Thanks for the help in advance..

Nick

 

[rmorey]

:welcome: to TBN!

Check the battery posts to ensure they're tight and clean. Then check ground wire at the frame for corrosion. It's new to you but may not be new built. Do the lights/dash instruments work if you turn the key? There's a 60 amp fuse in the positive wire near the battery you can also check.

 

[murphy1244]

Does the dash lights go on?

 

[Nick61]

Everything works, Dash lights, Lights, High beam, i went back out and tried to start it, nothing. I then played with the Range shift sensor. unpluged it and plugged it back in jiggled it and the tractor started. put it back in the barn, shut it off and she wont start again. I think I found the problem but wont be able to check it until Thursday. Thanks for the quick response. I appreciate it.

Nick

 

[rmorey]

Glad you figured it out and it's not serious.

 

[murphy1244]

Glad you figured it out and it's not serious.

Yep that's a hel l of a machine.

 

[Nick61]

Yes it is. Today was the first time I have been able to play with it. Love it! I have been waiting for 4 years. Finally get it and she has a giddyup in her hitch. I will call my dealer tomorrow. Maybe I can have a new sensor by Friday.

NIck

 

[Hard Knocks]

Is the dash showing the green indicator lights ( H-N-M-N-L ) when you move the shifter? If so it is not your range sensor. I have never seen one go bad. Most likely your key switch or start control relay located on the firewall. If I was to take a guess the relay would be the first thing to check. The fact that it started after wiggling and disconnecting the range switch might be pure coincidence.

 

[Nick61]

Does the dash lights go on?

Yes they do
Nick

 

[tcartwri]

Mine is almost always the HST neutral position switch. It's amazing what get's stuck up in there.

 

[Nick61]

Is the dash showing the green indicator lights ( H-N-M-N-L ) when you move the shifter? If so it is not your range sensor. I have never seen one go bad. Most likely your key switch or start control relay located on the firewall. If I was to take a guess the relay would be the first thing to check. The fact that it started after wiggling and disconnecting the range switch might be pure coincidence.

I will check the ignition module when I get home. How should I go about testing it? The relay on the firewall is ok. I unplugged the one on the far left and plugged in to the one on the far right. No change. I figured they were the same relay why not!
Thanks
Nick

 

[murphy1244]

Does the glow plug start up work?

 

[Nick61]

No it doesn't seem to light up. But, the motor was warm when I was trying to start it. Will it still light up when the key is turned with a warmed up motor?
Nick

 

[murphy1244]

so it lights up and when you turn it to start---nothing, not even dash lights?

So NO lights at all?

 

[k0ua]

No it doesn't seem to light up. But, the motor was warm when I was trying to start it. Will it still light up when the key is turned with a warmed up motor?
Nick

No it will not.. Not if the water temp sensor says the coolant is above 86 degrees F.

Tell us what you DO see. Headlights. Dash lights, and if so which ones.. L N M H range lights? if so then the range potentiaometer is OK. It is not a switch but a pot that applies a variable voltage to the control module depending on its position. The start relay is on the left of the firewall, looking toward the seat, then the glow plug relay in the middle then the fuel solenoid relay, The key switch is a known problem spot, shoot your favorite lube in there just to see. WD40 if nothing else. Report back and we will go from there.

James K0UA

 

[rmorey]

What happened to "wiggled the Range Shift Sensor and it started" from post #4?

 

[Nick61]

just the low oil pressure light and the neutral light. Brake if its on. dash lights work when lights or the high beam is on. The battery light will also come on but it is not as bright as the other lights. I can wiggle the key and the battery light will change intesity or, it will not illuminate at all. The battery is fine seeing how when the tractor finally wants to start, it starts right up.

Nick

 

[Hard Knocks]

Next step. Follow the ground wire from the battery to the frame connection point. Remove the bolt and clean the connector and frame with emery or sand paper. I know that it started once but I have seen this ground cause this issue more than once. Also Verify your battery connections.

You can check to see if it is ignition switch or control module with a meter. The key switch puts 12VDC positive to the positive side of the start relay coil when in crank position. Disconnect the relay and probe the connector where it plugs into the relay. You can put your meter on DC volts, connect the black lead to a good frame ground and probe the positive coil connector while putting the key in crank. You should get 12V. Next clip your positive lead to the battery and probe the negative side of the coil. You should register 12V with the key in run and crank.

Let us know what you find.

 

[Nick61]

No battery light? Do you hear the clunk of the shutoff solenoid when you turn the key to run?

Yes I do. But when I turn the key to start I get nothing.

 

[Hard Knocks]

Check your PM.