question 2006 Proxima 8441 hydraulic pump pressure adjustment

I have a 2006 Zetor Proxima 8441 cab tractor that barely lifts 2000 Lb pallet of feed. I am a professional heavy mechanic and need to know where i can find a hydraulic schematic and pressures to diagnose my lift issue. The bypass is going to relief at just over 2100lbs. Also, where I can purchase a parts and service manual for it.

Printed service manuals you can buy at any Zetor parts dealer og your choice. They can order it for you, up to 2013 Zetor models, its no problem.

I think you have to check your hydraulics pressure valve - and then set them up or change.
I have the German hydraulics workshop manual for Proxima, Major, Forterra from 2007 - I think with specific informations I can help, but I cant upload them because of law regulation. Its normaly for official Zetor partner workshops only.