PUMP GP-GR A 4641957 - Caterpillar

Power Control Switch
Illustration 5 g01548655Power control switch (43) is located on the front of the right armrest. The power control switch allows the operator to select either high idle or low idle engine speed.Intermediate speeds can also be selected in the following manner: Run the engine at high idle. Depress the decelerator pedal until the desired RPM is obtained. Press and hold the high idle switch in order to lock in the desired speed.Electronic Control Module
Illustration 6 g01560459Power train ECM (44) receives input from the sensors. The ECM uses this input in order to control the operation of the outputs of the ECM, including the brake control valve and the transmission hydraulic control. These outputs control solenoid valves, which receive signals of variable proportion from the ECM in order to control the operation of the machine. The inputs and outputs of the ECM are joined to the machine harness by two connectors. Each of the two connectors has 40 contacts. The power train ECM is located on the bottom of the left console near the operator seat.Sensors
Sensors are inputs that provide information to the ECM. The sensors signal changes in speed, changes in direction, and changes in position. The signal from the sensor changes in proportion to the changing condition.Position Sensor for the Direction Selector
Illustration 7 g01560473The position sensor for the direction selector informs the ECM of the position of the direction selector, including FORWARD, REVERSE, and NEUTRAL. The ECM uses this information to send the appropriate current to the transmission modulating solenoid valves on the transmission hydraulic control in order to shift the transmission. The position sensor for the direction selector is located inside housing (45).Service Brake Pedal Position Sensor
Illustration 8 g01548658Service brake pedal position sensor (46) informs the ECM of the position of the service brake pedal. The ECM uses this information to send the appropriate current to the brake control valve for slowing or stopping the machine. This sensor is located on the right side of the pedal housing.Decelerator Pedal Position Sensor
Decelerator pedal position sensor (47) informs the ECM of the position of the decelerator pedal. This sensor is located on the right side of the pedal housing.Engine Speed Sensor
Illustration 9 g01560475Engine speed sensor (48) is located on the flywheel housing on the left side of the engine. The engine speed sensor transmits the speed of the engine to the ECM by measuring the RPM of the flywheel.Transmission Output Speed Sensor
Illustration 10 g01564053Transmission output speed sensors (50) transmit the speed and direction of the output transfer gear to the power train ECM. The transmission output speed sensors are located on the top of the transmission case.Torque Converter Output Speed Sensor
Illustration 11 g01564073Torque converter output speed sensor (51) is located on the rear of the torque converter housing. This sensor transmits the speed of the output shaft of the torque converter to the power train ECM.Power Train Oil Temperature Sensor
Illustration 12 g01564113
View from the bottom of the machine
Power train oil temperature sensor (52) is located near the suction line for the power train oil