MODULE 3214474 - Caterpillar

Neutral (Torque Converter Drive)
This machine has two neutral positions on the rotary actuator. Position NEUTRAL-1 on the rotary actuator has a detent position on the rotary selector spool. Position NEUTRAL-1 is NEUTRAL on the operator console. Position NEUTRAL-2 on the rotary actuator also has a detent position on the rotary selector spool.Position NEUTRAL-2 on the rotary actuator does not have a position on the operator console. The operator does not have control over NEUTRAL-2. The rotary actuator and the rotary selector spool automatically go through NEUTRAL-2 on all shifts to NEUTRAL and from NEUTRAL.When the transmission control is in NEUTRAL position, the rotor for the shift lever switch is in NEUTRAL-1 position. With the shift lever switch in this position, current flows from the Power Train ECM through the shift lever switch to machine ground. The Power Train ECM then activates the downshift solenoid. When the downshift solenoid activates, hydraulic oil pressure goes to the rotary actuator. This causes the rotary selector spool to turn.The rotor on the transmission gear switch is connected to the rotary selector spool by a flexible coupling. When the rotor on the transmission gear switch is in the NEUTRAL-1 position current will flow from the Power Train ECM through the transmission gear switch to ground. This current flow is a signal to the Power Train ECM of a completed shift. Normally, the downshift solenoid would be deactivated. However, the Power Train ECM keeps the downshift solenoid activated in the NEUTRAL-1 position. This holds the rotary selector spool in NEUTRAL position.First (Torque Converter Drive or Direct Drive)
When the transmission control is moved to FIRST position, the rotor for the shift lever switch moves to FIRST position. Current then flows from the Power Train ECM through the shift lever switch to machine ground. This signal informs the Power Train ECM that the shift lever switch is in FIRST position.The rotor on the transmission gear switch is connected to the rotary selector spool by a flexible coupling. When the rotor on the transmission gear switch is in the FIRST position, current flows from the Power Train ECM through the transmission gear switch to ground. This signal informs the Power Train ECM that the shift is complete. The machine is now in FIRST gear and the machine is in torque converter drive.FIRST gear is torque converter drive at lower ground speeds. FIRST gear is direct drive at higher ground speeds. The transmission speed sensor transmits a signal to the Power Train ECM. This signal tells the Power Train ECM the ground speed of the machine. When the ground speed reaches approximately 6 km/h (4 mph), the Power Train ECM sends current to the lockup clutch solenoid. When the lockup clutch solenoid activates, hydraulic oil pressure goes to the lockup clutch. The machine is in FIRST gear and the machine is in direct drive.The lockup clutch will stay activated until there is an upshift, a downshift, or a decrease