TC30 quit,won't fire,turns over fine.

[northsway2]

Power to the solenoid is initiated from the ignition anytime it is ON, but it comes THRU the operator safety circuit. Since the engine turns over normally, your neutral sensing and PTO sensing are fine. I'm pretty sure that your problem relates to the seat switch. On my tractor, the seat switch logic is bypassed by the transmission being in neutral and the parking brake set. Does your tractor have a parking brake sensing switch and light on the instrument panel? The TC30 may not have either of these features.

I don't know how much your tractor would be like mine, but on the TC45D, the Fuel Solenoid is powered by a Fuel Solenoid RELAY. That relay is controlled by an Op. Safety Module which gets inputs from the seat switch circuit. When all is normal and safe, the safety module just provides a ground path for the coil of the Fuel Shutoff RELAY. This allows the relay to energize and apply 12 volts to the solenoid. The actual 12 volts that powers the solenoid come directly off a fuse. When you turn ON the ignition key, it powers the "hot" bus where all fuses are attached. That means if the fuse is not blown and the ignition switch is good (yours seems okay) then only the seat switch/parking brake switch and safety module are involved. If your tractor has no safety module and no parking brake switch, I'd guess that your seat switch provides a ground path for the Fuel Shutoff RELAY directly without any other logic, but I can't be certain without a schematic.

Jim,No park brake,no safety module but do have some sort of relay under the left fender at the seat area {they are a surprise}.
Going to pull the fuel solenoid and check for intermittant and then run power to the solenoid from the 5amp fuse directly [on when ign. on,off when off]
This tractor was made BEFORE all the dumbing down logic was applied to these units, I spent 30 years on a much modified NAA before a spider pin came loose and grenaded the whole rear end [rear digging trees @ 2000 rpm!,Kaboom].Only issue with washing that was the air cleaner,no relays,switches,safety stuff,just your brain! LOL.
Thanks all for the great info, still going to try to find the correct schematic but think this info will do the trick after all it's just a simple little diesel,------- right?
Dave

 

[northsway2]

:thumbsup:End of Crisis!!!!!
Wired new fuel solenoid wire to spare fused,unused lead that's on when ign. on and off when off.
Some might say "jury rigged" etc. but it's just a small diesel and without the proper schematic this has got me running with a minimum of hassle.{remember 30 years on "Jubiliee" NAA}.
The real irony here was that I was putting the tractor up for the year and getting ready to leave for the Az. desert and bass fishing when this happened.Just finished up 3 days of new landscaping/moving trees/ grading and the next day after doing my lube/wash to put her away,bam life comes at you again,stuff happens.
Thanks, All, Dave{soon to be blowin up stuff in the desert,heh,heh,heh}

 

[jinman]

Dave, since I've bypassed the seat switch on my tractor, I've done essentially the same thing as you did in a round-about way. I don't blame you for doing the connection as you did. You just made a simple tractor even simpler.

The one downside is if you sell the tractor without disclosure of this change. If somebody follows the schematic, they might be really confused followed by really upset when they discover the undocumented wiring change. I suspect it wouldn't be the first time though.

 

[northsway2]

Dave, since I've bypassed the seat switch on my tractor, I've done essentially the same thing as you did in a round-about way. I don't blame you for doing the connection as you did. You just made a simple tractor even simpler.

The one downside is if you sell the tractor without disclosure of this change. If somebody follows the schematic, they might be really confused followed by really upset when they discover the undocumented wiring change. I suspect it wouldn't be the first time though.

TRUE DAT!! Dave