D17 Series IV Hydraulics

So I have a series IV D17 that I added a spool valve to for a second set of remotes to run a loader. Since installing the spool valve I have done nothing but fight the hydraulics. Currently it has started running oil out of both sides where the 3 point lift arms are, three point will only pick up occasionally and the pump sounds like the hydraulic fluid is cavitation. If I hold the three point lever to lift it just gurgle's and then will act like it catches fluid and will work. Theater won't do much of anything. I'm at a loss as I didn't have the leaks before this and now nothing is working properly. Any help would be much appreciated.

Sounds like it is low on hydraulic oil, number one. And number two, if you have leaks, you've done something wrong assembling the valve stack.  There are a certain amount of Oring seals between each section and the torque on the three tie bolts isn't that terribly tight. They must be snugged up gently a little at a time to get an even and equal squeeze on all three tie bolts.You did use new Orings ??

So, if it is leaking at the lift arm SHAFT, the transmission is OVERFULL with oil. The hydraulic oil dipstick is to the LEFT of the gearshift. You have added oil in the wrong hole ???

The only reason the lift arm shaft can leak is because the transmission is overfull of oil. I still think you are low on oil in the hydraulics because they don't work right. That's what I think. I'm not there looking at it.

Not long couple of months and not much history on it. It's been sitting for about 2 weeks so I can check it in the morning.

Is this valve bolted to tractor valve or is it a separate valve mounted somewhere else ? Sounds like you teed into pressure line. If so, that won't work.            MACK

Yes I added another allis chalmers valve to the stack and bolted back into factory location.

So, is the transmission overfull on oil and the hydraulics low on oil ?????

I would agree about the pilot check.           MACK

But, what about your claim of dripping oil from the lift arm shaft ????

Where would I be pressurizing at the fill hole?

yes - just enough to prevent the pump having to suck up the oil . We  loosely wrap a rag around a blow gun and just barley tap the guns lever a couple of times.  If you over pressure the system you could blow a seal - but you would really have to  hold it to do that - if one has to use this method to prime a pump - there is a issue with the pump or supply lines/hoses.   Another thought - milky oil will cause the oil to foam - thus cavitation from the water dissolved in the oil. 

Make sure there is NO check valve ahead of the valves.  Had that happen to us.  Everything worked slow until we put the check valve after the valve levers.  

Ours is a Model 200 industrial loader.  Front pump with the reservoir in the loader brackets and the levers plum bed in there.  We added and auxilary 2 double spool controls after the loader controls.  Rear hydraulics were about half speed.  Found that the relief valve at the loader controls was dumping fluid and pressure to the rear.  Plumbed it straight back to the rear and then to loader controls where it dumped back into the reservoir.  Hope this makes sense as I am doing it off my memory.  Works great so all the effort and though paid out.  The 17 handles the loader ( round bales @ 800-1000lb) and with 2 double and the normal single spool on the rear.  Might be one of a kind but we love it.