320C Excavator Hydraulic System – Hydraulic Tank and Filter



Illustration 1 g00688158

(19) Return filter

(25) Hydraulic tank

(34) Element

(35) Return chamber

(36) Tank chamber

(37) Suction filter

(38) Line

(39) Suction line

(40) Port

(41) Relief valve

(42) Passage

The return oil from the hydraulic oil cooler flows through port (40) and passage (42) to return chamber (35) .

Return filter (19) consists of element (30) and relief valve (41). The return filter is mounted on the rear surface of the hydraulic tank.

The return oil passes through element (34) of return filter (19). The return oil then flows through line (38) to hydraulic tank (25). Thereafter, the oil passes through suction filter (37) and the oil is delivered to the pumps through suction line (39).




Illustration 2 g00688159

(43) Air breather

Air breather (43) is located on the upper surface of the hydraulic tank. The air breather prevents an increase or a decrease of air pressure in the hydraulic tank regardless of the following circumstances :

  • Change of air pressure in the hydraulic tank due to cylinder movement.

  • Change of air pressure in the hydraulic tank capacity due to a temperature change.