SENSOR GP-PRES 1900809 - Caterpillar

Illustration 1 g01905039
(1) Modulating valve for the torque converter lockup clutchThe Transmission ECM provides a Pulse Width Modulated signal (PWM signal) to the solenoid of the modulating valve for the torque converter lockup clutch (1). The PWM signal allows the lockup clutch pressure to be modulated.Deactivated
Illustration 2 g01905075
(2) Solenoid (3) Pin (4) Ball (5) Passage (6) Spool (7) Spring (8) Passage to tank (9) Passage to the transmission clutch (10) Passage from the pumpWhen solenoid (2) of the modulating valve for the torque converter lockup clutch is deactivated, pump pressure from the pump section for the transmission of the transmission charging and scavenge gear pump flows into passage (10). Spool (6) blocks passage (9) to the lockup clutch. Pressure oil flows through passage (5) to ball (4). The oil flows past ball (4) to the torque converter sump through passage (8). The machine is in torque converter drive.Activated
Illustration 3 g01905153
(2) Solenoid (3) Pin (4) Ball (5) Passage (6) Spool (7) Spring (8) Passage to tank (9) Passage to the transmission clutch (10) Passage from the pumpWhen solenoid (2) of the modulating valve for the torque converter lockup clutch is activated, pin (3) moves to the right. Pin (3) pushes ball (4) to close passage (8) to the torque converter sump. Pump pressure flows into passage (5). The pressure increases since passage (8) is closed. Spool (6) moves to the right against spring (7). Pump oil pressure is allowed to flow to passage (9) to the lockup clutch. The Transmission ECM opens the passage and the Transmission ECM closes the passage at ball (4) in order to maintain the correct lockup clutch pressure. The machine is in direct drive.