We strongly advise to clean up the hydraulic system in the event of damage of components (pump, engine...) in order to stop the contaminations which could have circulated in hydraulics of the machine. However, we have more and more customers who clean up their machines on a purely preventive basis, for example at the time of usual maintenance. The lifetime of the components is some increased and the breakdowns due to the contaminations (seizing of valves) are appreciably reduced. It is enough to make heat the machine (oil with 50°C), to connect the filter of cleaning up on the auxiliary line, to press on the pedal and to let the diesel engine outside to 1500 rpm approximately. 15 minutes are sufficient for an operation. The quality of the filter must be as follows : 5 microns ; Beta : 200 ; nominal capacity 100 to 150 litres/minutes (according to your hydraulic machine most important.)