To describe the effect of back pressure on the hydraulic oil filter system problems: the original system is the use of bypass filter, has now become a return oil filter, oil return all of the hydraulic system through the filter, the filter produces a pressure of about 4bar, then what will be the impact of the hydraulic system? The system is mainly hydraulic motors and cylinders, and control valves and the like. What will happen if the filter is blocked? Self sealing magnetic oil suction filter.
Personally think that the oil return pressure of 4bar, very little impact of the system, if the plug on the difficult, depending on the hydraulic system of you, but it is very difficult to filter blockage occurs, because the filter should be checked regularly, and hydraulic system of general impurities which have so many.
The influence of the back pressure of the oil return filter on the hydraulic system is explained here first