GASKET KIT 1315296 - Caterpillar

Main control valve (3) is located in the hydraulic system between the main pumps and actuators (cylinders and motors). Depending on the machine operation, the oil flow from drive pump (36) , idler pump (39) and pilot pump (38) to the hydraulic circuits are controlled by the operation of each component in the main control valve. By this control, the speed and direction of the cylinders and the motors can be controlled and adjusted. The pump delivery pressure can be controlled and adjusted.Main control valve (3) is a back to back design that uses a single valve body. The main control valve uses internal passages in order to combine flow for the boom and stick circuits.
The drive pump oil is delivered through pressure port (22) , center bypass passage (27) , and return port (6) to hydraulic tank (40) . The drive pump delivers oil to the following components:
Straight travel control valve (19)
Left travel control valve (24)
Boom I control valve (25)
Bucket control valve (29)
Stick II control valve (31)
The idler pump oil is delivered through pressure port (21) , center bypass passage (8) , and return port (6) to hydraulic tank (40) . The idler pump delivers oil to the following components:
Straight travel control valve (19)
Right travel control valve (18)
Boom II control valve (17)
Swing control valve (14)
Stick I control valve (10)
In addition, the following components are located in main control valve body (41) .
The line relief valve (bucket cylinder rod end) (9) and the line relief valve (bucket cylinder head end) (30) limit