It would be handy to have a valve that would enable both cylinders to move in and out in unison for an easy way to tilt the blade.
Sounds like you may have a problem in the resolver network. If you steer the machine or lift the blade, does the tilt start working?
No.....the only way it starts working is if I power down the blade lift and then activate the tilt with it powered down. Raise blade and tilt will work full stroke a few times and then start losing stroke until it barely tilts at all.
I looked at the resolver network in the service manual and I have never seen anything quite like that. Appears to be a bunch of check valve type things kinda mounted in series. I'm still not sure how it all works for now.