BIT-END 1957173 - Caterpillar

Illustration 1 g03384550
(1) Return filters
(2) Elements
(3) Return chambers
(4) Tank chamber
(5) Suction filter
(6) Suction port
(7) Passage
(8) Relief valve
(9) Return port
(11) Hydraulic tank
(12) Air breather The return oil from the hydraulic oil cooler flows through return port (9) to return chamber (3).Return filter (1) consists of element (2) and relief valve (8). The return filter is internally mounted in the hydraulic tank.The return oil passes through elements (2) of return filters (1). The return oil then flows through passages (7) into the hydraulic tank (11). Thereafter, the oil passes through suction filter (5) and the oil is delivered to the pumps through suction port (6).Air breather (12) 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.