Safety Thing on L3710 Forward/Reverse Pedal?

[Mr Haney]

My HST L3710 refused to start a couple of times. I figured it had to be some infernal safety thing. Looked all over and could not find it.

I found what looked like poo and twigs under the seat, so I blew it out with the leaf blower. I looked for broken wires. Tried and failed to find the seat switch.

By sheer luck, I discovered that the tractor would start if I jiggled the forward/reverse pedal. So there is some kind of safety thing there.

What is it? What's wrong with it?

 

[StephenR]

I don't have a Kubota HST to check out but, since you have to 'jiggle" the forward/reverse pedal, my wild guess is the "neutral safety" switch may be loose or defective. Since I do not know the actual name of the switch, I put it in parentheses.

 

[NCL4701]

If there’s a grease zerk for the pedal, grease it. They’re not always obvious so look closely. Seems to be a common issue with the pedal not quite returning to center by itself when it gets a little sticky but not sticky enough to be noticeable in operation.

 

[Mr Haney]

I'm going to look under it and try to get this fixed. I can't believe how many safety devices are on this thing.

 

[Mr Haney]

I have not been able to find a zerk near the pedal.

Also, the loader lever sticks a little. I'm supposed to grease it, but where? I raised the boot and saw nothing that looked like a zerk.

Is there a particular grease I should use? I have a tube of John Deere NLGI-1 I haven't touched yet.

 

[N3BP]

Your machine should only have two safety switches. One for the clutch, and the other for the PTO. Rocking the treadle shouldn't affect starting the machine.

Also, you have no zerk for the treadle since your particular machine will have the "feather step" HST. The treadle is not mechanically connected to the transmission, but rater by way of an external servo. As such, Kubota determined a zerk wouldn't be necessary.

 

[chim]

The safety switch on the HST pedal is the likely suspect. Here's what I did years ago on an L3200HST. Might be the same for you:

L3800 HST pedal adjustment

anyone familiar with or know specifics on the HST pedal adjustment? I been having starting issues (rapid clicking while starting) for a while and believe that is the problem. I took a quick look at it, but..... tight spot and couldn't see where to make adjustments. Also, is there a grease...

www.orangetractortalks.com

 

[N3BP]

The safety switch on the HST pedal is the likely suspect. Here's what I did years ago on an L3200HST. Might be the same for you:

L3800 HST pedal adjustment

anyone familiar with or know specifics on the HST pedal adjustment? I been having starting issues (rapid clicking while starting) for a while and believe that is the problem. I took a quick look at it, but..... tight spot and couldn't see where to make adjustments. Also, is there a grease...

www.orangetractortalks.com

There is no HST switch at the treadle pedal on a grand L10 machine, only at the clutch (unless it's a glide shift)

 

[Mr Haney]

There is no HST switch at the treadle pedal on a grand L10 machine, only at the clutch (unless it's a glide shift)

I haven't seen a switch, but the tractor will start if I lift the front of the pedal, so there must be a reason.

 

[chim]

There is no HST switch at the treadle pedal on a grand L10 machine, only at the clutch (unless it's a glide shift)

My 40 series may be different, but something shuts the engine off if I'm not seated and push the hydro pedal. Can't say exactly what the OP has. He did refer to it as " My HST L3710". Took him at his word. Although Tractordata.com might have bad info, they say the L3710 was made as gear, glide or hydro.

Maybe Henro can check with AI

 

[Mr Haney]

Can't say exactly what the OP has. He did refer to it as " My HST L3710". Took him at his word. Although Tractordata.com might have bad info, they say the L3710 was made as gear, glide or hydro.

I don't know what a glide transmission is. I have a hydrostatic transmission.

 

[JimDeL]

I haven't seen a switch, but the tractor will start if I lift the front of the pedal, so there must be a reason.

Try to trace the pedal linkage back toward the transmission. The switch is likely to be remotely located along the linkage.

 

[chim]

I believe you. There is something that shuts our tractors down that is connected with the hydro pedal. The only tractor I've wrenched on the hydro pedal switch was my L3200 years ago.

Maybe there isn't a switch like that on the newer Grand models, but SOMETHING prevents moving the tractor when the hydro pedal is pressed and our butts aren't seated Could be some computerized connection instead of the switch that was on my L3200.

 

[Mr Haney]

I wonder if I'm supposed to adjust the pedal's rest position.

 

[N3BP]

I believe you. There is something that shuts our tractors down that is connected with the hydro pedal. The only tractor I've wrenched on the hydro pedal switch was my L3200 years ago.

Maybe there isn't a switch like that on the newer Grand models, but SOMETHING prevents moving the tractor when the hydro pedal is pressed and our butts aren't seated Could be some computerized connection instead of the switch that was on my L3200.

There is nothing that prevents a Grand L10 from moving when you're off the machine. These machines predate operator presence systems. Trust me, I own one and hop off while the machine is running and in gear. As long as you're in low gear and the pedal return is adjusted properly, it holds. When in medium or high, it will creep slightly depending on your grade.

 

[N3BP]

I wonder if I'm supposed to adjust the pedal's rest position.

Attached is an explanation of the linkage and adjustment procedure for your machine taken from the FSM. The only way I could see the pedal affecting the machine during starting is if it was fully depressed and the starter couldn't overcome the load of the system and not turn over. If your NSS is functioning, this would be impossible.

However, there could be other reasons, but you'd need an HST wiz to chime in.....

 

[Mr Haney]

There is nothing that prevents a Grand L10 from moving when you're off the machine. These machines predate operator presence systems. Trust me, I own one and hop off while the machine is running and in gear. As long as your in low gear and the pedal return is adjusted properly, it holds. When in medium or high, it will creep slightly depending on your grade.

That's a relief. I read there was a seat switch. I knew the tractor would run without me, but I didn't know if it would start without me.

I routinely stand on the left side of the seat and move the tractor a few inches with the pedal. Is it dangerous? Don't care.

 

[N3BP]

That's a relief. I read there was a seat switch. I knew the tractor would run without me, but I didn't know if it would start without me.

I routinely stand on the left side of the seat and move the tractor a few inches with the pedal. Is it dangerous? Don't care.

I believe it was the next generation (grand L30 series) that received the operator pretense system (seat switch, ect).
The only two switches (besides ignition switch) that can prevent our machines from starting are NSS and PTO. I have both of mine bypassed for convince and reliability reasons. The NSS is normally reliable, but the PTO switch can be finiky and are the same type used on the shuttle of a glide shift machine and prone to failure.

 

[PaulL]

Is there a particular grease I should use? I have a tube of John Deere NLGI-1 I haven't touched yet.

If you put green grease on a Kubota, it'll explode. You have to buy proper orange grease.

 

[Mr Haney]

If you put green grease on a Kubota, it'll explode. You have to buy proper orange grease.

What I like are the ads that say a particular grease is compatible with "most greases." So just try it and hope nothing goes wrong.