ELECTRONICS GP-MONITOR 3967474 - Caterpillar

Illustration 1 g01370363
Control lens at maximum displacement
(1) Solenoid
(2) Valve
(3) Adjustment Screw
(4) Passage
(5) Locknut
(6) Passage
(7) Spring
(8) Bushing
(9) Spring
(10) Spring collar
(11) Spring collar
(12) Spring
(13) Control lens
(14) Passage
(15) Pin
(16) Cavity
(17) Shift actuator piston
(18) Cavity
(19) Passage High pressure oil from the drive loop flows into cavity (16) and the pressure oil forces shift actuator piston (17) downward. Pressure oil also flows through passage (14) to passage (4). The oil flows through passage (4) to valve (2). Also, the oil in cavity (18) flows through passage (19) to passage (6). The oil flows through passage (6) to valve (2).When there is no signal from the ECM to solenoid (1), valve (2) does not move. Since valve (2) does not move, the pressure oil in passage (4) is blocked. Also, the oil in passage (6) flows past valve (2) in the motor case.When the angle of the lens plate matches the required displacement, the actuator spring applies force on the control spring. When the force of the actuator spring equals the force that is applied by solenoid (1), the spool closes off flow to chamber (18).
Illustration 2 g01370368
Control lens at minimum displacement
(1) Solenoid
(2) Valve
(3) Adjustment Screw
(4) Passage
(5) Locknut
(6) Passage
(7) Spring
(8) Bushing
(9) Spring
(10) Spring collar
(11) Spring collar
(12) Spring
(13) Control lens
(14) Passage
(15) Pin
(16) Cavity
(17) Shift actuator piston
(18) Cavity
(19) Passage When the ECM sends a signal to solenoid (1), solenoid (1) overcomes the force of spring (7) and valve (2) moves downward. As valve (2) moves downward, a path between passage (4) and passage (6) opens. Regulated pressure oil flows from passage (4) past valve (2) into passage (6). Then, the oil flows from passage (6) through passage (19) into cavity (18).Since the surface area of shift actuator piston (17) in cavity (18) is greater than the surface area of shift actuator piston (17) in cavity (16), shift actuator piston (17) moves upward. Since pin (15) is connected to shift actuator piston (17), pin (15) moves upward and pin (15) moves control lens (13) to the desired angle.
Illustration 3 g01649076Edge filters (20) are located under displacement control valve (21). The edge filters help to keep contamination out of displacement control valve (21).