Tractor stops when throttle is applied.

[matt27919]

I have an l3902 bought new 2022. 97 hours on it. When I hit the hst pedal, the tractor dies. It throttle up all the way and idled at the 540 rpm mark for 15 minutes. I bypassed the seat safety switch with a 12 guage wire. I tightened the pedal safety switch nut. I have no idea what else it could be other than a wiring issue which kubota will not cover because it is 2 year amd 6 months old.

 

[MOOTS]

I have an l3902 bought new 2022. 97 hours on it. When I hit the hst pedal, the tractor dies. It throttle up all the way and idled at the 540 rpm mark for 15 minutes. I bypassed the seat safety switch with a 12 guage wire. I tightened the pedal safety switch nut. I have no idea what else it could be other than a wiring issue which kubota will not cover because it is 2 year amd 6 months old.

How did you bypass the seat switch? Picture? Has it worked before the problems you’re having today?

 

[matt27919]

How did you bypass the seat switch? Picture? Has it worked before the problems you’re having today?

I didnt need a bypass until today. And it worked when I parked it a few days ago.

 

[Moose7060]

Try taking the bypass out and put it back to normal. See if your stalling problem goes away.

 

[matt27919]

Try taking the bypass out and put it back to normal. See if your stalling problem goes away.

Still stalls out. Hooked a multimeter on ohms up and it beeps indicating the safety switch isn't broken anyways.

 

[GreensvilleJay]

hmm 'tractor dies'

does it TRY to move and then stall out
or
engine shuts off ?

 

[MOOTS]

I didnt need a bypass until today. And it worked when I parked it a few days ago.

That wire looks awful big to make a good connection. Male spade connectors fit better. If you have a multimeter, you can test the switch easily.
Went on a service call to a farm I service some of their equipment. Same issues, frozen switch. Pulled it out and got moving, reinstalled and it worked as should.

 

[matt27919]

hmm 'tractor dies'

does it TRY to move and then stall out
or
engine shuts off ?

It tries to move. I can drive very, very slow. Like it's in a sort of limp mode.

 

[matt27919]

That wire looks awful big to make a good connection. Male spade connectors fit better. If you have a multimeter, you can test the switch easily.
Went on a service call to a farm I service some of their equipment. Same issues, frozen switch. Pulled it out and got moving, reinstalled and it worked as should.

Thank you. I will try to get a spade connection and see what happens.

 

[GreensvilleJay]

OK, maybe parking brake is stuck on ? It is winter here....'stuff' happens.

 

[MOOTS]

It tries to move. I can drive very, very slow. Like it's in a sort of limp mode.

I can do the same with my MX if I am standing and looking at my forks. Have to creep, like hardly move. My seat switch is not bypassed.
I’d bet your seat was just frozen enough to not press the switch.

 

[matt27919]

OK, maybe parking brake is stuck on ? It is winter here....'stuff' happens.

I dont ever turn my parking brake on. It's an hst so I dont even use the brakes much anyways. I live in northeast nc, so it's all flat land.

 

[GreensvilleJay]

be nice to have the WSM or al the very least the wiring diagram, otherwise it's a process of elimination. Hmm nc, so not icy and cold like here.....
sounds like it 'could' be the seat switch OR the wiring around it. look for cuts/slices/ open wires....
maybe post 2 pictures of what you have ? 'fresh pair of eyes' ?!

 

[North Idaho Wolfman]

You have a bad HST switch!

 

[matt27919]

You have a bad HST switch!

The safety switch above the pedal or something separate? Got to find a part number i can order.

 

[North Idaho Wolfman]

The safety switch above the pedal or something separate? Got to find a part number i can order.

Before you just throw parts at it use the WSM (aka service manual) to verify that is really the issue.

 

[North Idaho Wolfman]

This is the part you will test then replace if needed.

 

[matt27919]

This is the part you will test then replace if needed.


View attachment 146001

Thank you.

 

[GreensvilleJay]

Have a GOOD look at the wiring to it, whatever is nearby. it 'could' be that a wire has been 'sliced' or 'cut',so either open or shorted to ground. wiring diagram is a must to properly troubleshoot.