G2000 dies when mower is engaged.

[dlundblad]

The engine runs fine, but dies right as the PTO is engaged. If pulled back fast enough, the engine will remain running. It did the same thing the first time mowing with it, but I noticed a frayed wire for the seat safety sensor and bypassed it. The "repair" only held for 2 mowing secessions.

The tractor was purchased last month for $500 in non running condition. Liquid cooled gas with 1300 hrs. The issue turned out to be the positive battery terminal. Aside from a tear in the seat and 3 missing hubcaps, she's pretty clean. The PO replaced the ignition switch with what appears to be a non Kubota part if that matters.

Thanks everyone and happy upcoming Independence Day!

 

[Cglaza]

I think your on the right track with looking at the safety switches. Dont know much about the machine you have but a wiring schematic would do you well right now. Again, now clue where to find one.

Sent from my SM-G900V using Tapatalk

 

[scdeerslayer]

Definitely sounds like the seat switch.

 

[lugbolt]

Those older G series are well known for electrical issues....so I would be inspecting all of the harnesses and their connectors, specifically the ones under the dash, under the radiator, and around the engine.

 

[dlundblad]

It turned out to be what I am assuming is the PTO safety switch that the PTO/ mower lever engages and disengages as it's turned on and off.

 

[100 td]

Sounds like the PTO switch is working perfectly, when the switch is operated, meaning the PTO is engaged, it switches in the safety circuit and shuts the engine down "if no one is sitting in the seat". So I would recheck the seat switch wiring.

 

[dlundblad]

The seat safety sensor has already been bypassed.

The PTO switch is bypassed now too and she runs fine. If it was something with the wiring, we would still be seeing the same issues even with both switches out of the equation.

 

[scdeerslayer]

Tough to say without knowing exactly how the wiring works but there's probably a break in the seat switch wiring somewhere. I agree that the PTO switch was working properly, but with bypassing the PTO switch it doesn't know to shut off now.

 

[dlundblad]

The wiring for the seat switch was damaged at the seat's side of the wiring. I just unplugged the seat (it's a 2 prong trailer plug), cut the wire and spliced what wiring was left together. The actual harness on the tractor seems fine. A 2 prong trailer plug should fix the seat's wiring no problem.

I am guessing the PTO switch wasn't closing the circuit like it was supposed to. Either way, the PTO turns on and off as it should and it mows for now.

 

[BX23S-1]

The wiring for the seat switch was damaged at the seat's side of the wiring. I just unplugged the seat (it's a 2 prong trailer plug), cut the wire and spliced what wiring was left together. The actual harness on the tractor seems fine. A 2 prong trailer plug should fix the seat's wiring no problem.

I am guessing the PTO switch wasn't closing the circuit like it was supposed to. Either way, the PTO turns on and off as it should and it mows for now.

I would go buy a PTO switch... better to just play it safe rather than wishing you had later on.

 

[100 td]

As mentioned previously, the fact that the engine shut down whenever the PTO was actuated, means the PTO switch is operating! Your problem is elsewhere in the circuit. Now you have bypassed the switches you have bypassed a critical safety feature. Each to their own.

 

[dlundblad]

As mentioned previously, the fact that the engine shut down whenever the PTO was actuated, means the PTO switch is operating! Your problem is elsewhere in the circuit. Now you have bypassed the switches you have bypassed a critical safety feature. Each to their own.

I have a circuit with a switch. With both combined, they do not work. After removing the switch, the circuit works. Are you really telling me my issue is with the circuit and not the switch?

Also, nowhere in my thread did I say the tractor was "fixed." Things needed bypassed for trouble shooting. You'd be throwing money at things otherwise.

 

[BX23S-1]

I have a circuit with a switch. With both combined, they do not work. After removing the switch, the circuit works. Are you really telling me my issue is with the circuit and not the switch?

Also, nowhere in my thread did I say the tractor was "fixed." Things needed bypassed for trouble shooting. You'd be throwing money at things otherwise.

Exactly... you did the right thing in figuring it out. And your right, two elements involved, the circuit, the switch, which either can be the problem. We ALWAYS by-pass the switch first, because THATS usually the problem.

Throwing money at the problem... sounds like the dumbdumb`s at all the car dealerships...
they cant diagnose anything, so they just keep throwing parts on it and spending your money for you.
Eventually they find the problem AFTER they`ve replaced everything, on YOUR dime.

 

[100 td]

Are you really telling me my issue is with the circuit and not the switch?

As mentioned previously, if you push the PTO lever and something happens, then the switch is working, if it wasn't working, then when you pushed the lever, nothing would change. (For a single circuit switch)

While I don't know the EXACT logic of your mower, GENERALLY the safety logic of mowers are as follows.

When the engine is running -
If the PTO is engaged, AND no one is sitting in the seat, the engine will shut down.
If the forwards/reverse/gear/neutral switch is operated AND no one is in the seat, the engine will shut down.

When trying to crank the engine -
If the PTO is engaged, the engine will not crank.
If the forwards/reverse/gear/neutral switch is not in neutral, the engine will not crank.
Generally, the seat switch input is not used in crank mode. However,
other things like hand brake may be required to be set before being able to crank the engine, depending on make and model.

The safety relay/controller circuit may contain a box of electronics to facilitate this, or just a couple of relays.
What is happening with yours is, you are actuating the PTO via the lever and the engine is shutting down, because it is actuating the PTO switch correctly, but the safety circuit is missing some other input such as the seat switch, a blown fuse, rubbed or incorrect wiring, a faulty controller or a bad wiring plug or connector.

So go and buy a new PTO switch if you want to throw money at it, but if it was me, I'd be looking elsewhere. I can't do the testing from here so you can take all this with a grain of salt, as it could all be irrelevant! YMMV