Thank you for your questions, please find our comments below:
For using the 3rd function for the Front or the Rear of the tractor, we offer an Add-on kit that allows you to switch between the Front 3rd Function ports and the Additional Rear Hydraulic ports. This allows for the convenience of using the 3rd Function for either without needing to re-route hoses or change anything on the tractor.
Feathering and "True 3rd Function" is both a discussion and a debate. We offer 3 different kits to add a 3rd function to the front loader. We offer our Electric Selector Kits (ESK), and our True 3rd Function Kits (TFK). The TFK Kits are available "on-off", similar to other kits on the market, or electronic Proportional control. Both of our TFK Kits include the following custom features:
Continuous Power Beyond - even when using the 3rd Function.
Metering Flow Valve - Allows the operator to set the flow to the 3rd Function.
Independent Pressure relief - Since 3rd functions work off the loader Power Beyond Port, we built in a Pressure Relief for just the 3rd Function.
We prefer to call the TFK Kits "Independent 3rd Function" kits. We had offered the Electric Selector Kits for years, but customers wanted the 3rd Function independent from the bucket curl. The issue with this....many times the loader will not dual function due to the pressure differences in the 2 open circuits. Hydraulic flow is governed by the "path of least resistance". In other words, when you open 2 circuits at the same time, the flow is going to the circuit with the least pressure. As an example, if you close a grapple and curl the bucket at the same time, the grapple will close faster than the bucket will curl. The flow always goes to the path of least resistance. You need to be able to "feather", or control the flow to any 2 circuits that are open simultaneously. Thus we offer the metering valve on our Control Manifold, and also offer the Proportional controlled kit.
All the kits are functional for Grapples, Plow Blades, etc. The different Kits offer different features depending on the customer's preferences. We have a little of everything in our different style kits.....but all offer Continuous Power Beyond, so it is impossible to dead head the hydraulic system with our 3rd function kits.
Hope this helps...sorry for the long winded yap