Edited by: Mike Santora • Associate Editor
Since the launch of the return-suction filter from Argo-Hytos, this filter concept for mobile machines has become a standard in many applications because its functional improvements lower system and maintenance costs.
A common example is in the hydraulic system of a beet harvester, which typically consists of a hydrostatic drive. The variable pump in the closed circuit is connected to the hydraulic motor at the axles and helps ensure locomotion. Fixed or variable pumps supply the users in the open or closed circuit. A variable pump in the open circuit also supplies the steering system.
The filters in the hydraulic circuit guarantee function and wear protection. Thus one differentiates between protective filters, whose function is protection through coarse hydraulic filters/strainers and working filters that provide wear protection through fine hydraulic filters.
For the drive, protecting the filling pump, ensuring oil cleanliness and protecting against wear are of primary importance. The same applies for the working hydraulics (open/closed circuit), because here the pump also has to be protected and the necessary oil cleanliness must be ensured.
A single return-suction filter takes over almost all the tasks mentioned above. The filter concept for the entire beet-harvesting machine is completed by two additional filters—a ventilating and filling filter. The filling strainer downstream of the ventilating filter prevents coarse dirt from entering the tank while filling or re-filling oil during maintenance or repair work.
Engineers selected the series E 598/E 998 for the beet harvester. This was followed by extensive testing under real conditions. After the tests, the preparations for the production launch could be started. The series E 598/E 998 features a modular connection concept with two stackable connecting plates. For the return and suction side, two connecting plate variants are already available in the standard, which can be positioned and turned through 90° to each other. A variety of connection configurations are possible. The system also has improved cold-start characteristics because the filling pump is supplied with pre-charged oil.