silverbullet wrote: My money is on the valve being 90 or 180 degrees out, it is balanced when off-load but the moment it is asked to turn you seem to be getting full pressure on both sides of the ram/rack piston so it locks up.
BANG ON!!
Had it apart again yesterday and stared at it for five hours imagining fluid flow through the valve.
I couldn't for the life of me see how the torsion bar could deflect enough to allow the ports to open untill the penny dropped.
I gave the non return valve a little poke to check its action and I realised I was imagining everything in reverse.
I was thinking fluid entered the valve through the centre of the shaft and then through holes to the valve ports. It actualy enters through the middle of the three grooves into a port with no hole and back out to the left/ right grooves.The bore in the shaft takes the return to the reservoir.
Not sure if any of that makes sense to anyone else.
I realy should exercise my brain more often. It is seriously rusty.
But the feeling of elation when it all became clear and explained every symptom, and I could see exactly how all the parts worked was almost worth all the hours of frustration.
I'll post some pictures at some point to illustrate my ravings.
Cheers,
Tim.