Hydraulic Valve Kit for lifting NH 479 w/Ford 600

Given: I don�t have a loader and don�t plan to add one. (broken frame piece at front of tractor needed for loader mount). I would like to raise/lower a New Holland 479 Haybine. All my other implements are 3pt or pull.

Questions:
What does �one spool tandem (4-way) mean and should I care?
Do I want a �spring center to neutral� for my application?
Should I get �relief� or is it OK to not have �relief�?
Should I get �float� or let it sink?
Which of the eight kits will best fit my needs for the least amount of money?
Are there additional parts required beyond the kit?
Why does the most expensive kit ($489.64) have the shortest description?
Kit assembly, includes 2-spool valve, valve box with handles.
Why does the cheap kit ($128) have the longest description?
Valve, hydraulic, with handle, single-spool multi-valve. No relief, tandem (4-way) spool, convertible to 3-way, spring center to neutral, with 90� rotated handle.

Still better than manually raising/lowering using a racketing toplink.

Where can I find out if the haybine is just too heavy for my tractor? Can I buy a 6volt hydraulic pump to use with a spool valve?

Recently purchased video on rebuilding the tractor internal hydraulics but hope to avoid that if possible since 3pt is working OK. Maybe 3pt would work better if I spend the winter rebuilding. Easier to add(purchase) spool valve which I need and see what happens.

By the way how do you "chain 3pt down" while pulling haybine with PTO running? I bent a cast iron tow bar trying hold down the 3pt. I like to see a photo of someone who has "chain 3pt down and use your 3pt lever to raise and lower mo-co"

Coming out of the port on the plate you need a valve, this is used to close of the port just like it had a plug in it. You could try and get by with a hyd coupler but have you ever tried to connect or disconnect one with pressure on it? Next you need to determine if you need a return. Most lift only apps don't so I assume you don't. Not needing a return run from the valve to the cyl. Next step in the operation is to chain down the the 3pt. They really mean "chain" it down (no stay brackets). Wrap a chain around the axel and up over the lift arm (not where you mount impls, arm under seat). This proceedure makes the 3 pt inoperable, period. Trying to use it and the hyd is just asking for disaster. Not even for a draw bar. Get one that comes out from under the tractors belley. Now that the 3pt in fix and not movable, you open your valve (open the path to the cyl) and raise the 3pt control like you where raising it. This pushes hyd fuild through the port to the cyl. Once the cyl reaches it end the relief in the tractor will open, leave the 3 pt control up. When ready to lower, lower the control and fuild will travel back through the port as the unit lowers. One common error is to not properly tie down the arms. Hyd fuild under pressure (holding something up) is looking for some place to go. If those arms come loose, they will raise up to the point where the bypass is triggered and what ever you have up will come crashing down.

To use the 3pt, close the valve and remove the chain. BTW don't open the valve with the 3pt up. Same thing as before, it will come down.....