CORE A 4W7647 - Caterpillar

Stick Out
Illustration 1 g03494696
Stick drift reduction valve (STICK OUT)
(1) Stick drift reduction valve
(2) Drain port
(3) Passage
(4) Port
(5) Valve
(6) Passage
(7) Spring
(8) Spring chamber
(9) Spool
(10) Drain passage
(11) Port
(12) Port
(13) Passage
(14) Port During a STICK OUT operation, pilot oil is not sent from the pilot control valve to port (12) of stick drift reduction valve (1). Spool (9) does not shift.The oil flow from the stick I and stick II control valves combines in the main control valve. The combined oil flow enters port (4) of the stick drift reduction valve. The combined oil flow flows into passage (3). As the oil pressure in passage (3) increases, valve (5) shifts against the force of spring (7). The oil in spring chamber (8) flows through passages (13) and (6) to port (14). The oil delivery in passage (3) now flows through port (14) to the rod end of the stick cylinders.Stick In
Illustration 2 g03494700
Stick drift reduction valve (STICK IN)
(1) Stick drift reduction valve
(2) Drain port
(3) Passage
(4) Port
(5) Valve
(6) Passage
(7) Spring
(8) Spring chamber
(9) Spool
(10) Drain passage
(11) Port
(12) Port
(13) Passage
(14) Port
(15) Spring chamber
(16) Cover When the joystick is moved to perform a STICK IN operation, pilot oil is sent from the pilot control valve to port (12) of stick drift reduction valve (1). Spool (9) shifts to the right until the spool contacts cover (16). The oil in spring chamber (8) flows through passage (13), the orifice in spool (9), spring chamber (15), and drain line (10) to the hydraulic tank.The return oil from the stick cylinder rod end enters port (14). Since the pressure in spring chamber (8) is low, the oil in port (14) shifts valve (5) against the force of spring (7). The oil from the rod end of the stick cylinders flows through port (14), passage (3) and port (4) to the stick I control valve.