Help me

[Brownswiss 79]

L3901 will throttle up and down fine but push the hydrostatic pedal and it moves slightly and then dies. It is cold here like in the single digits. Fluid levels are fine drained water seperator . What might my trouble be

 

[i7win7]

Safety switch. I'd check the seat switch first, then look for a switch on the hydro petal next

 

[DaveFromMi]

Could it be fuel gelling?

 

[Code]

i only say it cause it happened to be. is your brake locked on?

 

[Brownswiss 79]

i only say it cause it happened to be. is your brake locked on?

Checked that and it appears to be free

 

[Brownswiss 79]

Could it be fuel gelling?

Not sure, it throttles up and down fine

 

[The Evil Twin]

If it doesn't bog down first, it's likely a safety. Seat switch is the first one I'd try.

 

[NCL4701]

I’d unlock the parking brake and try engaging the PTO while sitting in the seat. If it dies then, that kind of points toward the seat switch.

It’s supposed to die if the hydrostatic pedal moves from neutral with no one in the seat. It’s supposed to die if you engage the PTO with no one in the seat unless you have the brake locked and seat tipped forward. If the seat switch isn’t working, it doesn’t know your in the seat so it won’t let you move the treadle out of neutral (or engage the PTO with the brake off).

 

[nbryan]

I’d unlock the parking brake and try engaging the PTO while sitting in the seat. If it dies then, that kind of points toward the seat switch.

It’s supposed to die if the hydrostatic pedal moves from neutral with no one in the seat. It’s supposed to die if you engage the PTO with no one in the seat unless you have the brake locked and seat tipped forward. If the seat switch isn’t working, it doesn’t know your in the seat so it won’t let you move the treadle out of neutral (or engage the PTO with the brake off).

This is the best and simplest description I've seen yet regarding safety switch operation on these tractors.

 

[North Idaho Wolfman]

NCL4701 has some good advice!
Other issue could be Faulty HST pedal switch or wiring.
I'll send you a link for the WSM (aka Service manual) it will have all the troubleshooting info in it.

 

[ayak]

First run this test (from lugbolt):

In my case, wiggling this connection ‘to’ the seat switch, took me to finding this broken wire—-and I had the exact symptom you describe.

so my seat switch itself was fine, but one of three wires in the plug going to it was partially cut.

 

[TheOldHokie]

L3901 will throttle up and down fine but push the hydrostatic pedal and it moves slightly and then dies. It is cold here like in the single digits. Fluid levels are fine drained water seperator . What might my trouble be

I had that happen shortly after I got mine. Turned out I had left a wrench laying under the seat and it was holding the seat up just enough to prevent the seat switch from closing. Big sigh of relief.....

Dan

 

[i7win7]

This was on you tube today

 

[Moosemanny]

L3901 will throttle up and down fine but push the hydrostatic pedal and it moves slightly and then dies. It is cold here like in the single digits. Fluid levels are fine drained water seperator . What might my trouble be

Just fixed this on my tractor. The seat will fill with water and freeze on cold days and you won’t be able to close the seat switch. Heat the seat up to melt the water and try again. If you have a two prong switch, jump the wires together to test. Good luck.