VALVE 0847153 - Caterpillar

Illustration 2 g01263370
Right Console (5) Speed dial (6) Propel leverSpeed dial (5) and propel lever (6) are located on the right console. The propel lever controls the direction of travel. The combined effect of the speed dial and the propel lever controls the speed of the machine.The center position of the propel lever represents the NEUTRAL position. The locking collar on the propel lever must be lifted before the lever can be moved from the NEUTRAL position. For forward travel, the operator must move the propel lever toward the front of the machine. For reverse travel, the operator must move the lever toward the rear of the machine. The potential speed of travel increases the farther the lever is moved away from the center position.The speed dial limits the maximum speed that the machine will travel for a given position of the propel lever. Maximum travel speed is proportional to the position of the propel speed dial. The farther the speed dial is rotated counterclockwise, the slower the maximum travel speed. The farther the speed dial is rotated clockwise, the faster the maximum travel speed. When the speed dial is in the MINIMUM SPEED position, the machine remains in neutral.
Illustration 3 g01263371
Inside Right Console (7) Reverse switch (8) Forward switch (9) Propel lever sensor (10) Speed dial bufferThe propel lever controls reverse switch (7), forward switch (8), and propel lever sensor (9). These components are mounted to a bracket under the propel lever.The forward switch and the reverse switch are actuated by the propel lever. When the propel lever is in the NEUTRAL position, both switches are open. When the propel lever is in the FORWARD position, the forward switch is closed and the reverse switch is open. When the propel lever is in the REVERSE position, the reverse switch is closed and the forward switch is open.Circuit breaker "CB13" provides power to contact "1" of the forward switch and to contact "1" of the reverse switch. The forward switch provides an input signal to terminal "B23" of the machine ECM when the switch is closed. The reverse switch provides an input signal to terminal "B24" of the machine ECM when the switch is closed. If either switch is closed when the machine is started, the machine ECM will disable the propel circuit. Also, the machine will not move. In this situation, the propel lever must be moved back to the NEUTRAL position before the system can be reset.The propel lever sensor detects the position of the propel lever. Circuit breaker "CB13" provides power to contact "A" of the sensor. The sensor is grounded at terminal "B22" of the machine ECM. Contact "C" of the sensor sends a pulse width modulated signal to terminal "B20" of the machine ECM. System software analyzes the input signal in order to determine the desired travel direction. The machine ECM uses this input signal along with input signals from the speed dial buffer and the work mode switch in order to determine the desired