today,let us share a new knowledge about oil quantity of press brake.as everyone knows there are a hole on the middle of axial plunger pump.this hole is to reduce the pressure.but it is also a standard of your hydraulic oil quantity.if you do not know how many oil to fill in the oil tank,you can take this as a standard. our advise is to be 300 mm higher than this hole.if your oil quantity is below this hole,it will hurt this press brake cylinder.so,it is so important to keep a touch with manufacturer.you can ask any problem with them. before getting a answer,you can not continue to use this machine.