L3400, 2010 model year, safety switches

[rcr1991]

Does anyone know where I can find a list or diagram of safety switches on my l3400, non-hst?

The reason I am asking is it seems a faulty switch is at the root of my problem. Started when tractor would not start. Fuel pump seemed to put out little pressure so replaced it. Bled air out of system. tractor started, ran long enough to go across the driveway. Then would not start again. Trial and error and a spare part led me to discover that the fuel shutoff solenoid was bad. Replaced it with new one and tractor worked for a bit, until next time it would not start. The under seat safety switch looked funky so took it out and shorted that circuit. Started right up, again, until it would not start again.

Then I read about taking that fuel solenoid off. Did that and tractor started right up. Now have a cord running from the shutoff lever to turn the tractor off. It starts every time, and I pull the level to stop it. Yes, opening to where the solenoid is covered. But what a pita this whole process has been, and I am more than a little disappointed that I have a jerry rigged piece of cord as the engine shuts off.

logic Suggests to me that a safety switch is shorting intermittently and that is why the tractor won’t start when the shutoff solenoid is in place. What am I missing? I have read that there are other safety switches? But I have searched and not yet found any systematic way to identify and test each one so I can figure out what the heck is wrong and then how to fix it.

sorry for the long post. I am not a mechanic as you can tell, but I can’t do troubleshooting step by step and so far this has me stumped. Thanks in advance for your ideas on what to do next.

Rob

 

[North Idaho Wolfman]

It's called the WSM, aka ( service manual).
Verbiage is super important with this kind of an issue,
Is it not Cranking?
Or is it Cranking and and not firing?
Your answer will dictate what to look at next.

 

[rcr1991]

Now with all the steps I've outlined it starts right away. But the fuel solenoid is NOT in the tractor. With fuel solenoid installed, no crank. Nothing.

 

[North Idaho Wolfman]

I'm a little at loss...
The fuel stop solenoid should have nothing to do with it not cranking.
That is unless there is a tie in with the OPC which controls the cranking.
Let me do some research and get back to you.

 

[rcr1991]

I'm a little at loss...
The fuel stop solenoid should have nothing to do with it not cranking.
That is unless there is a tie in with the OPC which controls the cranking.
Let me do some research and get back to you.

If it will NOT start with fuel solenoid in, and WILL start with fuel solenoid out, doesn't that mean that a safety switch is shorting the fuel solenoid? Look forward to hearing the results of your research.

I am sorry if I missed something in what you wanted to know.

 

[North Idaho Wolfman]

If it will NOT start with fuel solenoid in, and WILL start with fuel solenoid out, doesn't that mean that a safety switch is shorting the fuel solenoid? Look forward to hearing the results of your research.

I am sorry if I missed something in what you wanted to know.

When you hook up the stop solenoid does it blow any fuses?
The only thing that makes any sense is that the stop relay is shorting the OPC out.
Or the OPC is shorting out.
The safety switches do not have any direct connection with the stop relay, they only interact with the OPC.

 

[Russell King]

If it will NOT start with fuel solenoid in, and WILL start with fuel solenoid out, doesn't that mean that a safety switch is shorting the fuel solenoid? Look forward to hearing the results of your research.

I am sorry if I missed something in what you wanted to know.

What NIW is trying to say is that the tractor should crank (spin over) with or without the fuel solenoid installed.

A safety switch can stop the tractor from spinning the engine so it won’t start.

The fuel stop solenoid will not allow the tractor to fire and run due to lack of fuel into the engine (If it is malfunctioning).

hope that helps but try not to just use “start” to describe this problem since that can mean both won’t start spinning or won’t fire and run but spins

 

[rcr1991]

OK, now I get the point. Sorry for my incorrect choice of words. Appreciate the patience and education very much!

I am going to step through the parts of this story on the tractor, take some notes and shoot some video and report back.

I will start with:
fuel stop solenoid OUT of tractor, what happens?
fuel stop solenoid IN the tractor, what happens?
seat safety switch shorted, what happens?
seat safety switch open, what happens?

Any other steps I should document to help troubleshoot?

NIW wrote:
When you hook up the stop solenoid does it blow any fuses?
--No fuses are blown with fuel stop solenoid IN or OUT or tractor.

The only thing that makes any sense is that the stop relay (NOT SURE WHAT "stop relay" refers to) is shorting the OPC out. Looking up OPC in shop manual.

Or the OPC is shorting out.

The safety switches do not have any direct connection with the stop relay, they only interact with the OPC.

OK, out to the barn and back soon with a report.