What Does This Button Do???

[8934]

I recently purchased a used JD 17zts, and dont have the the operators manual yet... (It is on order) There is a button on the instrument panel that I cant figure out what it does... It is driving me bonkers.

I am talking about the button on the left, after you press it, the little green light in the lower left lights, but that is all I can see that it does.

No clicks, hums, or diference in machine, that I can tell.

My WAG is it is supposed to affect the unloaded bucket movement speed, (a feature of some excavators I read about while doing research before buying) but I cant tell any difference.

Help?? What does it do!!!

 

[gatractorman]

My WAG would be that is has something to do with engine rpm according to the icon above the button, assuming I'm looking at the right one. Alot of modern trackhoes have an automatic idle so the engine goes to idle after a few seconds of non use but comes back up as soon as a function is moved.

 

[8934]

I agree thats what the picture looks like...

But it doesnt work, if that is what it is, and there is only a simple direct cable going from the throttle lever, to the fuel injector pump. There is a large soloinoid valve on the injector pump, but I assumed that was fuel shut off.

Since I purchased machine used, it only has about 5 weeks of factory warantee left. I want to make sure it is working properly.

The button to the right, does work the headlight.

I did see something in my research about load sensing hydraulic function, that I assumed it was, but that doesnt seem to do anything either.

 

[wrangler6831]

If it is for the load sensing Hyd function, the way it works is that you push it and the machine automatically revs the engines to the needed output of the load. It has more to do with fuel savings than anything. It only idles up if the Hyd senses it needs more power to lift a given load. So the only time you would sense it doing anything is if your digging at low idle and the hyd needs more power to lift the load. Give that a try and see if it works.


Rich

 

[DieselPower]

DON'T PUSH IT! IT'S THE SELF DESTRUCT BUTTON. Seriously, I think Rich hit the nail on the head. It automatically adjust the engine speed up to compensate for increased load.

 

[mjncad]

Don't you just hate those cryptic icons without text to explain their meaning?

 

[8934]

That would be sweet...

It would be great if it automaticly increases engine speed based on hydraulic load. It also makes sense since I have been running wide open when digging why I dont see a difference when I press it.

Called dealer today, the operators manual still isnt in yet...

I am out of town for a week, and will have to wait to try it untill I get back.

Thanks for the help.

 

[IH3444]

Looks like the arm thermo-detonation-device that the Predator wore and set off after losing to Arnold in the first movie....... I didn't understand those egyptian hydros either...

 

[8934]

The dealership called this afternoon.... The operators manual is in. So I will know exactly what it is supposed to do when I get back from my DC trip.

I will let you guys know what it does.

 

[8934]

I had my wife pick up the manual, she said the button is NOT shown in the manual, so she called the factory... They didnt know either, and are doing some research.

The mystery deepens....