BREATHER 1514154 - Caterpillar

Illustration 1 g01721478
(1) Hydraulic tank
(2) Filter element
(3) Bypass valve
(AA) Implement return port
(BB) Case drain return port
(CC) Secondary steering port
(DD) Implement suction port Hydraulic tank (1) is located behind the operator's cab. The oil reservoir is not vented. The oil reservoir contains a reverse flow element. Pressure is relieved when the cap is loosened. Secondary steering suction port (CC) and implement suction port (DD) provide outlets for the oil. These outlets flow to the implement and steering pump and the secondary steering pump. Case drain return port (BB) and implement return port (AA) combine the oil into the manifold. The manifold routes the oil through the bottom of the filter element and inside of the filter element. The filter element is positioned below the oil level in order to reduce turbulence.If the filter element becomes full of debris, oil cannot pass through the filter element. The restriction to oil flow causes a pressure increase which opens bypass valve (3). A pressure of 35 kPa (5 psi) will cause the bypass valve to open. Now, the oil is allowed directly into hydraulic tank (1). When oil bypasses filter element (2), debris in the oil will cause damage to other system components. Correct maintenance must be used in order to make sure that the filter element does not stop the flow of clean oil to the hydraulic system.