An Investigation of Roll-off Cleanliness for Hydraulic Systems and its Application to a Tractor

This study investigated the roll-off cleanliness operation to eliminate the built-in contaminants which are primarily the result of manufacturing and assembly procedures. A rigorous analytical examination of the cleaning process associated with hydraulic systems was performed by developing the general filtration process equations. The sloughing process by which inherent contaminants become entrained in the system fluid was examined during the development of a general analytical expression for sloughing rate. This sloughing rate expression in conjunction with the filtration process equations have lead to a relationship which describes the flushing and cleansing operation for hydraulic systems. The effects of the primary roll-off cleanliness factors were discussed and illustrated. Then, the analytical results were shown to be usefully applied into the roll-off flushing operation for the hydraulic system of a tractor. The experimental result was close to the analytical estimation of the fluid cleanliness level reached in a limited time for productivity.