question Zetor 9540 problem

Have a zetor 9540 when the torque multiplier is on low she’s very jumpy while driving almost like clutch is slipping and the pto doesn’t work. When the multiplier is on high position everything works fine pto and drives normal. Another problem which I don’t know if it’s connected or not when I pull spool lever tractor cuts out completely any help would be appreciate

So far I’ve checked:
Oil level was correct
Torque packs
Valve chest for pto and torque multiplier
Main clutch
Small hydraulic pump next to the filters

Is there anything else I can check ?

I think you have to check the hydraulic pressure for the gearbox, the valves and the clutch pakets.

hard to say, from far away, sorry