RADIO GP 5251508 - Caterpillar

Stick Hydraulic System
A stick cylinder is used to move the stick IN and OUT. When the stick cylinder rod EXTENDS, the stick moves IN. When the stick cylinder rod RETRACTS, the stick moves OUT.The main hydraulic pumps supply high-pressure oil to the main control valve. The main hydraulic control valve determines the direction and speed of the stick cylinder in proportion to the movement of the joystick. A STICK IN operation is accomplished when the oil delivery from both front pump and rear pump is supplied to the head end of stick cylinder. Flow combiner proportional hydraulic modulation valve (PHMV) is activated by the machine ECM. Flow combiner spool then shifts to the allowing front pump oil to combine with rear pump oil. The combined oil from the front pump and the rear pump then flows to stick Independent metering valve (IMV) section.Components of the stick system include:
Stick IMV section
Stick drift reduction valve
Stick regeneration valve
Stick Anti-drift valve
Stick cylinderNote: Refer to the appropriate sections in this manual for more information.