CABLE AS-COILED 1241497 - Caterpillar

Illustration 1 g03878302
Partial schematic (STICK IN)
(1) Stick cylinder
(2) Stick lowering control valve
(3) Main control valve
(4) Pilot control valve (stick and swing) STICK OUT Operation
Illustration 2 g03386301
(5) Spring
(6) Valve
(7) Spool
(8) Seat
(9) Throttling slot
(10) Passage
(11) Passage
(12) Port
(13) Port
(14) Spool
(15) Port
(16) Passage
(17) Check valve
(18) Spring
(19) Passage
(20) Passage
(21) Line relief valve
(22) Passage
(23) Manual lowering valve When the operator moves the joystick to the STICK OUT position, the pump oil flows from main control valve (3) through a line to port (12) of stick lowering control valve (2). The pump oil flows into passage (11) and the pressure of the pump oil causes check valve (17) to shift downward against spring (18). The pump oil flows through passage (19) to passage (16). Then, the pump oil flows from passage (16) to port (15) at the rod end of stick cylinder (1). The rod of stick cylinder (1) will retract in order to perform a STICK OUT.When the joystick is returned to the NEUTRAL position, stick cylinder (1) is held in the OUT position. Check valve (17) and valve (6) prevent the oil in the rod end of stick cylinder (1) from flowing out.STICK IN Operation
Illustration 3 g03386316
(5) Spring
(6) Valve
(7) Spool
(8) Seat
(9) Throttling slot
(10) Passage
(11) Passage
(12) Port
(13) Port
(14) Spool
(15) Port
(16) Passage
(17) Check valve
(18) Spring
(19) Passage
(20) Passage
(21) Line relief valve
(22) Passage
(23) Manual lowering valve When the operator moves the joystick to the STICK IN position, pump oil flows from main control valve (3) through a line that is ported to the head end of stick cylinder (1).Simultaneously, pilot oil flow is provided to port (13) of stick lowering control valve (2). The pilot oil at port (13) will cause spool (14) to shift to the left. Spool (14) will force spool (7) to move to the left against spring (5).The oil in the rod end of stick cylinder (1) begins to flow to port (15) of stick lowering control valve (2). As oil flows into passage (16), check valve (17) will remain closed. As pressure begins to rise in passage (16), spool (6) will begin to move to the left and oil will flow to passage (10). The oil then flows from passage (10) to port (12). From port (12), the oil will flow through a line to main control valve (3) and back to the hydraulic tank.When the joystick is returned to the NEUTRAL position, the loss of pilot oil pressure will allow spring (5) to force spool (7) and spool (6) to close. Oil in the rod end of stick cylinder (1) is trapped and stick cylinder (1) is held in position.Manual Stick Lowering
Illustration 4 g02079474
(20) Port
(22) Port
(23) Manual lowering valve
(24) Seat
(25) Locknut
(26) Ball As seat (24) is turned counterclockwise, ball (26) will shift. As ball (26) is shifted, oil is allowed to flow through port (20) and manual lowering valve (23) to port (22). Oil from the rod end of stick cylinder (1) flows through port (22) to the hydraulic tank. This allows the stick to lower.