Ford 3910 Hydraulics Fast/Slow rotator knob

[srsnitch]

I need some help understanding how the fast/slow response knob works. The one on my machine seems stuck. What s the secret to making the knob turn. Thanks for your help!

 

[Seven Gables]

That half round knob is probably just a little stuck from not being moved in some time. I've had to loosen mine up by driving out the little compression pin that holds the knob on and remove knob. Now you can grab the shaft with a pair of vise grips , spray the shaft with liquid wrench , tap the end of the shaft with small hammer and wiggle it back and forth with vise grips. It only rotates about 90 degrees I believe. It adjusts the lift speed of the 3pt hitch unlike a lot of tractors which have adjustable down speeds.

 

[srsnitch]

I'll give it a try, Thank You!

 

[Tinhack]

It's for draft control reaction speed, not "lift speed" per say. It only comes into play when you're using ground engaging implements like plows and such with draft control. And you have to have your reaction pin in the correct position. That's why the knob frequently "freezes"--Not many folks know how to use it.

The knob on mine was missing so I made a lever. I only get about 30 degrees of movement. I typically leave it on fast but move it once in a while to keep it free.

 

[Seven Gables]

It's for draft control reaction speed, not "lift speed" per say. It only comes into play when you're using ground engaging implements like plows and such with draft control. And you have to have your reaction pin in the correct position. That's why the knob frequently "freezes"--Not many folks know how to use it.

The knob on mine was missing so I made a lever. I only get about 30 degrees of movement. I typically leave it on fast but move it once in a while to keep it free.

I use mine to control lift speed with the position control lever. When using my 3pt rototiller. Set it to lower flow , when I raise my tiller out of ground it comes out nice and slow and doesn't leave a divot. It's main function is to control rate of correction for draft control as you said.

 

[Birdhunter1]

I had a 3910 for 14 years. One of the first things I noticed was the only issue with the tractor was that knob would not turn. While I could have worked on it and made it turn everything worked and worked well so I never bothered with it. I always figured if I made it turn the likely I would break something that would lead to a few hundred dollars in parts and several hours to make it all work again, all for the sake of making that knob turn that I had no need to turn.
I would very much say if it doesn't turn but everything works leave it.