Hey,


I think your system has or is pulling air.
Bleed the cylinder (see Y - 1st-3rd stage)?
Bleed the hall sensor (see 9)?
Do the pistons extend evenly?
Is there enough oil in the tank when the pistons are extended?
Is the oil temperature in the working range?

Some documents from Bucher.

https://1drv.ms/f/s!Arj9j2ORAi8Ah79UTaTq2YcjPmYT-w?e=gm4icX

good luck.