VALVE GP-SOLENOID 1737832 - Caterpillar

Illustration 1 g01103540
(1) Pilot line (rotator) (2) Line (3) Line (4) Rotator motor (5) Main control valve (6) Return line (7) Center bypass passage (8) Center bypass passage (9) Control valve for rotator circuit (10) Spring (11) Active orifice (12) Load check valve (13) Spring (14) Negative flow control orifice (15) Pilot control valve (boom and rotator circuit) (16) Parallel feeder passage (17) Return passage (18) Pilot line (rotator) (19) Negative flow control line (20) Pilot oil manifold (21) Left pump (22) Right pump (23) Pilot pump (24) Pressure reducing valve (25) Pilot line (rotator) (26) Pilot line (rotator)The oil delivery for the rotator circuit is supplied by right pump (22) only.
Illustration 2 g00697166
(9) Control valve for rotator circuitThe oil delivery from right pump (22) flows through center bypass passage (8) in main control valve (5) to the control valve for rotator circuit (9). The oil delivery from left pump (21) flows through center bypass passage (7) in main control valve (5). Illustration 1 shows the main control valve when only the rotator circuit is activated.When the hydraulic activation control lever is in the UNLOCKED position, the oil delivery from pilot pump (23) flows through pilot oil manifold (20) to pilot control valve (15). When the joystick for the rotator circuit is moved, pilot oil flows through pilot control valve (15) to pressure reducing valve (24) through pilot line (26). Pilot oil then flows through pilot line (1) to the control valve for rotator circuit (9). The pilot oil pressure shifts the spool in the control valve against spring (13). The pilot oil on the other end of the spool in the control valve flows through pilot line (18) to pressure reducing valve (24). Pilot oil then flows through pilot line (25) to pilot control valve (15) to the hydraulic tank.Since the spool in the control valve is fully shifted, center bypass passage (8) is blocked. None of the oil delivery from the right pump flows to negative flow control orifice (14) and no negative flow control pressure is created in center bypass passage (8). Since no negative flow control pressure is sent to the right pump regulator through negative flow control line (19), the right pump regulator moves the swashplate of the right pump toward the maximum angle position. The output flow rate of the right pump is increased and the oil flows through parallel feeder passage (16), load check valve (12), the control valve for rotator circuit (9) and line (3) to rotator motor (4) .Since the oil delivery for the rotator circuit is supplied by the right pump only, the negative control pressure in center bypass passage (7) is high. Left pump (21) remains at the destroked position.Reference: For more information concerning the negative flow control operation, refer to Systems Operation, "Negative Flow Control".The return oil from rotator motor (4) flows through line (2), active orifice (11) in the control valve for rotator circuit (9), return passage (17), and return line (6) to the hydraulic tank. Active