If I understand right his loader functions are currently run by the remote coupler valves and he is going to add a new loader control valve. Rather than buy a two-spool loader joystick valve, and a diverter kit to run the third function, I would look at a joystick valve with the third spool. I don't see using a separate handle for the grapple as a hardship, as long as the lift and bucket are on the joystick. I expect it will cost less in the end and be easier to hook up (plus no electrical issues on top of hydraulics). This one at Surplus center is an example.
It is likely there somewhere, but I didn't find a kit like you described at Surplus Center. I did find one at Summit Hydraulics. At Summit the kits like you described run in the 6-to-7-hundred-dollar range, then if he has to purchase a two-spool joystick valve to begin with it is going to add another 3 hundred plus. If the kit is at Surplus and I missed it, please add some links. I have a loader I am looking at upgrading to the 3 spool Prince joystick valve and would like to see options that are cost effective.
If cost is a consideration Summit has a three lever three spool loader valve for considerably less. One needs to be sure to get the closed center conversion for any valve to be used on a closed center system, that is not a true closed center valve. It is common to wind the adjustable relief valve, on the convertible valves, to the maximum when used on a closed center system to prevent it from opening. Also, a true loader valve will have a float detent on the lift spool, otherwise they are just directional valves.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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