In machines with a hydrostatic drive and combined working hydraulic system, return-suction filters replace the suction or pressure filters previously required for the feed pump of the closed-loop hydrostatic drive circuit as well as the return filter for the open-loop working hydraulic circuit. While each circuit operates independently with separate filters, the combination of the two circuits via the return-suction filter causes interaction between the circuits.

The TA-TB filters are designed to work in hydraulic systems combined with hydrostatic transmission, when the return flow is higher than the flow of the boost pump in any operating condition ( >50% in normal operating conditions). The oil from the return line of the system is filtered from the inside to the outside of the filter element and goes to the suction of the boost pump with a 0,5 bar pressurization. The exceeding flow rate goes into the reservoir

USER BENEFITS:
Only 1 filter for 2 functions: filtering the oil returning from the hydraulic system and feeding the boost pump with cleanest oil
Less piping required / fewer potential leakage points
The charge-pump takes oil at a slight pressure (0.5 bar), avoiding cavitation risks but also contributing to good cold-start behavior
Charge-pump protection as the oil supplied is already pre-filtered
Filter element working from inside to outside allows retained contamination to be completely removed when replacing the element