Foot Throttle On A D/100 Series ??

Well, I was talking about tractors, not dozers.  

Awesome Sauce!

That's the joy of my simple design (Copied from the 6000 series). The governor is not messed with, the hand throttle still works as intended, no over revving is possible because of the foot throttle.  

One of the main reasons I did mine was pulling out onto a road near our farm. It's a blind curve on a 55 mph road. You pull out with the fuel on and jamb the PD into high to get out as soon as you can. This way I can let off the throttle a bit while hitting high to lesson the shock load, then press for throttle until I am clear then I can advance the hand throttle as needed. That was my thinking....

It appears that I'm being misunderstood here... the presence, or lack of a foot throttle is of no consequence to me- I'm neither for, nor against.  I have many machines that had hand throttle only, many that had foot only, and many that had both.  I've had machines that had decel pedals, pedals that would go from hand-throttle setting to max governed speed, and pedals that would go from idle, to hand-throttle setting.

My point here, is that a person cannot just slap a pedal on a machine, and connect it to the throttle/governance system without carefully determining what they're doing, and how it affects the machine.

Case In Point... we have had at least FIVE chime in describing how they use THEIR foot-throttles, and in each case, the FUNCTIONAL operation of that pedal is different.  Gary's foot throttle works different from Red Bank's... Red Bank's post illustrates that HIS tractor's foot throttle overrides the hand-throttle setpoint.  This is NOT an unusual setup for many DIESEL machines-  My Komatsu 340 articulating loader had that exact setup... the point I made before about DIESELS, because diesel injection pumps typically have their OWN internal governors- a low speed governor (for low idle, but above fuel cutoff) and a maximum speed governor(never to exceed)... while the working speed is somewhere in the middle range... and regardless of what mechanisms select the actual fueling rate, one can NEVER exceed the pump's upper setpoint.

A gasoline engine doesn't have an injection pump's integral speed limiting governance.  IF you pull the throttle to WFO, it will speed up, until it cannot spin any faster, or until it self-destructs... and any devices (hydraulic pumps, PTO implements) will be included.

Engineers don't arbitrarily throw on control features without having absolute clarity of what will, and will NOT happen when an operator is at the controls... but I've seen plenty of unexpected damage from poor understanding.

For those interested in adding one, I'll cheer you on, but encourage you to understand how YOUR machine's governance works, and how YOUR modification will affect the machine.  Just be very careful- don't set it up so that it can force the machine into an overspeed condition, bad things happen really fast.

He's a smart guy, I get that.  Point is, Gary made this foot throttle some years ago I gather and it works perfect for him.  Sometimes, a well-after-the-fact dissertation isn't needed.  And, sorry, but Dave is actually the one who derailed the discussion in my opinion.  We were talking foot throttles on TRACTORS and yes, TRACTORS WITH LOADERS (which apparently is something different) and then Dave commented a decelerator would be more useful.  I cited that I'd been driving tractor for close to 50 years and have never hoped for a decel pedal instead of how I'm equipped.  But then dozers came out as the reason.  As if that isn't different than a tractor?????  Sometimes, just sometimes, if a dissertation isn't well received, maybe don't follow it with yet another dissertation.  Just sayin'.  

im4racin wrote: Dave is talking on a way higher level than most others here.  He is a very smart man and everyone should listen.

If you say so but his opinion doesn't carry the authority of the engineers at Fiat,Yanmar,

David Brown,Pasquali and a host of other companies that designed and had installed on their farm tractors foot throttles as far back as the 1960's.Foot throttles on farm tractors were apparently standard equipment and well like by farmers who liked to use them for the last

50 or more years.To come out now and state they don't work is absurd.

Gary Burnett wrote: If you say so but his opinion doesn't carry the authority of the engineers at... ...To come out now and state they don't work is absurd.

This is where not reading comes in:

Never.  That is an absolute fabrication.

In contrast, I stated many examples of how they DO, and I pointed out that I have them on my own machines, and that wether it's on a tractor, or a backhoe, or an FEL, loader... is irrelevant.

I stated that they can be configured to operate in many different ways, and that careful consideration in how it operated, was very important, because:

You CANNOT take a foot pedal, slap it on, and connect a link to a throttle, and expect it to work properly without understanding the governor. Do it wrong, and it may not do what you expect, AND you'll risk doing serious damage.

You are very correct that the engineers of the companies you identified (and many more you didn't) have fitted tractors with foot throttles.  I assure you that, for ANY of the foot-throttle systems that went into production, were designed, built, and tested to every circumstance or failure mode by engineers with AT LEAST HALF my engineering education, and at least a QUARTER of my engineering experience.  They know absoutely positively what they're doing, AND... they have at least THREE engineers with at least same or greater education and experience than I, looking over their work, before signing it on to prototype.  That's what experienced engineers do... they not only check for errors, they provide insight, advice, and mentoring.  the OLD engineers know all the mistakes that were made DECADES BEFORE the young guys walked in the door.