Well, I stand corrected (or whatever) I did say I am not familiar with the AC tractors after the WD/WD-45 as that is all I have owned and used. I did not have a remote hydraulic set up on any of my tractors. I find all this info interesting and educational. Thanks.

Dave

Dave nothing you said is incorrect......D17 worked basically the same as the WD and WD45. The traction booster basically works by pumping oil to a cylinder....whether it goes to the remote cyl or the lift arms is determined by which was the easiest path. AC had to come up with a way to keep it from going to the remote cyl so they designed the transport valve. When the knob on it was screwed out it kept oil from going to the remote cylinder until peak hydraulic pressure was reached.....if it was left in, oil would go to the remote because it had a greater mechanical advantage than the lift arms. In the first case, the lift arms will start lifting the hitch and transfer the weight to the tractor (good)...in the second case the whole disc would start to lift out of the ground (not good) and none of the weight gets transferred to the tractor (it can't transfer weight to the tractor if the lift arms aren't lifting anything). And there ain't no way no how you are going to get BOOSTED TRACTION (traction booster) if you are pulling any implement with nothing hooked to the lift arms PERIOD!

Eldon,
You are correct about the transport valve. In addition, the transport valve allowed the oil to return to the sump when the load lessened.

The maximum lift on the lift arms could be adjusted with shims in the transport valve. By adding shims more weight transfer was obtained before the transport valve bypassed oil to the remote cylinder which would lessen the load by raising the implement on it's transport wheels. The valve control knob, when turned the other way, also locked the flow of oil from returning to the sump for transporting the implement down the road.

Without using the lift arms you can only lessen the load by raising the implement with it's transport wheels. This can be done automatically by by the traction boost when the lift arms are all the way up and then oil is sent to the remote cylinder.

We did have a traction boost hitch for a 190XT that consisted of a hitch that connected to the lift arms (three point)and to the drawbar. It was two plates about 3" apart (one on top of the other) that had a pin hole inset several inches for pulling pull type implements. As I remember, the implement hitch had to be shimed, on the pin, to make it fit tight in the boost hitch so when raised it tried to lift the whole implement like it was fully mounted thereby transfering weight. I also remember it was very heavy to install and dirty because, like a fifth wheel on a semi-truck, it had to be greased to reduce wear when turning.

Well I learned something....didn't know that you could use the transport valve to keep the cylinder up during transport. I guess that is where it got the name! We always flipped the transport latch on the disc and relieved the pressure from the cylinder when travelling down the road.

I've seen the tb hitch for a 3pt you had on the 190 in a book somewhere...I looked for it but couldn't find it. It looked like a fairly simple design as I recall.