SHIM-TAPPET 1183789 - Caterpillar

Stick Out
Illustration 1 g03005277
Stick drift reduction valve (STICK OUT)
(1) Passage
(2) Port
(3) Stick rod end pressure sensor
(4) Passage
(5) Stick drift reduction solenoid valve
(6) Spool
(7) Stick drift reduction valve
(8) Return passage
(9) Valve
(10) Spring chamber
(11) Spring
(12) Passage
(13) Load check valve
(14) Stick rod end cylinder-to-tank spool
(15) Stick pump-to-cylinder rod end spool
(16) Passage
(17) Flow compensator During a STICK OUT operation, solenoid valve (5) is not activated by the machine ECM and spool (6) does not shift.The oil flow from the front pump and rear pump combines in the main control valve. The combined oil flow enters passage (16) and flows through flow compensator (17). Load check valve (13) opens and allows the pump oil to flow through stick pump-to-cylinder spool (15). As the oil pressure in passage (1) increases, valve (9) shifts against the force of spring (11). The oil in spring chamber (10) flows through passages (12) and (4) to port (2). The oil delivery in passage (1) now flows through port (2) to the rod end of the stick cylinder.Stick In
Illustration 2 g03005296
Stick drift reduction valve (STICK IN)
(1) Passage
(2) Port
(3) Stick rod end pressure sensor
(4) Passage
(5) Stick drift reduction solenoid valve
(6) Spool
(7) Stick drift reduction valve
(8) Return passage
(9) Valve
(10) Spring chamber
(11) Spring
(12) Passage
(13) Load check valve
(14) Stick rod end cylinder-to-tank spool
(15) Stick pump-to-cylinder rod end spool
(16) Passage
(17) Flow compensator During a STICK IN operation, solenoid valve (5) is activated by the machine ECM and spool (6) shifts downward. The oil in spring chamber (10) flows through passage (12), and spool (6). The oil in spring chamber (10) now flows through drain passage (8) to the hydraulic tank.The return oil from the stick cylinder rod end enters port (2). Since the pressure in spring chamber (10) is low, the oil in port (2) shifts valve (9) against the force of spring (11). The oil from the rod end of the stick cylinder flows through port (2), passage (1), cylinder-to-tank spool (14), and returns to the hydraulic tank.Stick Hold
Illustration 3 g03005316
Stick drift reduction valve (STICK HOLD)
(1) Passage
(2) Port
(3) Stick rod end pressure sensor
(4) Passage
(5) Stick drift reduction solenoid valve
(6) Spool
(7) Stick drift reduction valve
(8) Return passage
(9) Valve
(10) Spring chamber
(11) Spring
(12) Passage
(13) Load check valve
(14) Stick rod end cylinder-to-tank spool
(15) Stick pump-to-cylinder rod end spool
(16) Passage
(17) Flow compensator
(18) Sealing face When the joystick is moved to the NEUTRAL position, the stick cylinder is held in the OUT position. This action allows valve (9) to shift to the right due to spring force and oil pressure in spring chamber (10). Valve (9) will then seal against sealing face (18). Valve (9) prevents oil from leaking from the rod end of the stick cylinder. Stopping oil leakage prevents stick drift.