L5030 - replaced solenoid and still not starting

[jugheadjones]

Kubota L5030, worked great few days ago. Few days past, went to start tractor and will roll over, but won't fire (start). Did basic troubleshooting. All filters new this past summer. Thought had it diagnosed to Fuel Stop Solenoid and replaced it today. No change. Tested connector where connector from wiring harness connects to solenoid. have power to each pin (2P connector) to Solenoid. When turn key to on/acc position, can hear solenoid activate (distinct sound). There are times can't hear it. There are times turn key, no sound and leaving key in ON position. 20 seconds later hear the solenoid activate. During each of these times, the 30 AMP Fuse will not light a test light. (all other fuses will). Cleaned fuse connections, and no change. replaced fuse and no change. Is it power from ignition to fuse. (Starter relay fuse 30 AMP) If a person chooses to bypass and connect from battery/starter to solenoid, tractor will start. What would not be allowing power to that fuse (outside the chance, that fuse bay is faulty, or physical wiring harness). Any suggestions welcomed and appreciated.

 

[North Idaho Wolfman]

A bad key stop relay would stop it from working right.

You should only have power on both legs when you are cranking, otherwise with key on you should only have power on one leg.

I've PM'ed you a link (top right under your name) to download a copy of the WSM, it has all the trouble shooting and wiring schematics needed to fix it.

 

[jugheadjones]

North Idaho Wolfman - Thank you for the information, and what to try next. Will update when i can. Currently storm blew thru and no power and trying to get other things "settled". Thank you.

 

[jugheadjones]

North Idaho Wolfman - from our testing. We have power to the Key Stop Relay, but no power coming out. (Power from relay to solenoid). If we remove Relay (unplug the relay connector), and energise line, we can engage the fuel stop solenoid.

We put all back in place and additional testing. 4 Pin relay connection. Of the two wires that go from Relay to Fuel stop Solenoid. When we turn key to engage Fuel Stop Solenoid. One of the Two wires heading from the Key Stop Relay to the Solenoid has power (test light, will light up). The second wire from Relay to Solenoid does not have power (No light via test light), and the Key Stop Solenoid, does not engage. When we bridge the two wires, then the Fuel Stop Solenoid will engage. Is the issue with the physical Key Stop Relay? From our testing, it takes the 2 wires to activate the fuel stop solenoid. - Thank you.

 

[North Idaho Wolfman]

The second wire comes from with the starter relay, it is only live while cranking.

What exact model do you have?

 

[Tooljunkie]

One wire comes on with key in run- this is the hold wire,it holds solenoid in run position. Second wire comes on with crank only,it pulls solenoid so it allows fuel,then hold circuit takes over.

If you "hot wire" solenoid and leave start wire engaged it will burn up solenoid.

 

[jugheadjones]

North Idaho Wolfman and Tooljunkie, - Kubota L5030 is the model of tractor. HST/Cab. Agree if "hot wire" solenoid, would cause damage. Just a "second" its crossed during testing yesterday. Trying to narrow down where issue is. Far as we can tell, with the 2nd wire not sending power, its not holding the soleniod in the engaged position, and not allowing tractor to start (it will roll over, but not start, no fumes/smoke from exhaust, as no fuel getting in). Our current assumption is that when we cross or hot wire the solenoid, it engages the solenoid, and the solenoid holds in the run position. The solenoid when it engages, is a distinct sound, that can be clearly heard from within the cab, with cab doors shut. Does our theory seem sound, or should we also be looking somewhere else at the same time. Thank you for your help and time.

 

[jugheadjones]

North Idaho Wolfman and Tooljunkie - Just wanted to provide updated status and also thank you for help and guidance, in looking toward a resolution. Our additional testing didn't narrow it down to Fuel Stop Relay or Starter Relay. We put the dash back together and thought outside the box. We ordered a neutral switch (below cab, along left rear housing/rear end). Replaced the switch this afternoon, and now the Tractor cranks, starts and runs. Our theory the neutral switch was bad/faulty, and didn't allow "the tractor" to acknowledge that the FWD/Reverse pedal is in the neutral position during starting. _ For A number of days the tractor would crank, but never start. No fumes were coming out of exhaust. First thought Fuel Solenoid, which lead to fuel relay. For our example, it lead us the neutral switch. We now have tractor starting and running. (this evening started it 3 - 4 separate times). North Idaho Wolfman and Tooljunkie, thank you for your help and time the past few days. Have a great 2017.

 

[MadMax31]

Nice! I love seeing the resolutions, often were left hanging if something was ever fixed. Ive had safety switches in the HVAC world not 100% close, but rather 5-25 ohms. Enough to bleed voltage but not enough to activate a circuit.