I know this is old but as i recall. i adjusted the pressure relief. there are 2 of them as i recall.
Did you ever figure out this issue? I have same issue with a PB50.
are your transport chain tight
Thank you. I'm on family time for the weekend, but will check that out first thing Monday.
After rebuilding the lift cylinders on the one I worked on the problem continued, just like what you describe. Those lift cylinders have a lot less force trying to push the forks down, compared to up, due to losing the surface area the shaft takes up. Even at 2500psi the rollers all have to be good to get that heavy machine to lift up or there is friction and binding. Being outside and the road grime getting on these machines they need lots of greasing. Maybe you have a pressure problem but once I got the one roller turning again and lubed everything away it went.
I called Princeton and they told me it was probably bypassing via the tilt relief valve. I capped that off, still won't pick up. Lift cylinders have both been replaced within the past 6 months by the part time mechanic. Will check mast and carriage bearings on Monday. Any other possible things to check would be great.
Also if any of the mast bearings are bad or seized up it can cause that problem. Check and lube them and the channels.
Are the hydraulic functions slow? Could be your pump is worn.