[quote name="Husky" post="705567" timestamp="1471433888"]Well I traced out all of the plumbing and everything is connected correctly. I tried cycling the lift lever and the aux hydraulic lever while turning the steering wheel. It locks the steering wheel when either of the levers are cycled so I know that hydraulic pressure is arriving at the power steering unit.
My next move is going to be to disconnect the piston rod at the frame of the tractor. I will cycle the steering wheel and see if the rod moves in and out. If it moves I'll see if I can get a feeling of how much power it has. I have a feeling that the cessna control valve is worn internally and there wont be much I can do about that. It may end up just being a pretty addition to my tractor.]
Now you have me thinking what could be worn out it the control valve, the spool fitment is based on the orings for clearances, there is no metal to metal contact. How did the spool go in? Tight ? This set up is a bastard compared to most valve/spool combos , usually you slide the spool in and work the orings into the valve body to avoid tearing the oring . It is impossible to do on the Cessna valve, you have to lubricate the bejesus out of the spool so it won't tear them on installation I use copious amounts of white lithium grease , cross my fingers and usually have to rap it with a soft blow hammer to get the the spool past the orings and into position, I've still tore a few and had to tear it down and go again.
A pitted spool on the bosses would allow blow by affecting pressure , but other than that I don't know. Basically the fluid leaves the pump in 1/2" lines the tee drops it to 3/8" then down to 1/4" hoses attaching to the unit. I see this as more an end of the line piping design if you will rather than a desired pressure increase , thou reasons to be the restrictions however slight should allow additional pressure and not affect flow. Maybe I'll drag the 86 I was going to put mine on out , plum it up and see. I am defiantly curious now.
As a side note Rick Show (blackjackjakexxix) plumbed the later style ps unit on his '86 with no divider spool, he had an FEL
on it and said it made a huge difference , he had no issues and ran it for several years problem free hydraulically . Not period correct but his was function over form. Just something to consider.
Edited by WrenchinOnIt, August 17, 2016 - 04:31 PM.