BRACKET-PULLEY 7N7608 - Caterpillar

Travel speed and direction are determined by the position of the speed/direction control lever. The lever moves in an upside-down "Y" pattern. Movement of the lever to the right is FORWARD and movement of the lever to the left is REVERSE. Zero speed (NEUTRAL) is achieved when the lever is in the center part of the "Y" pattern. The parking brake is applied when the lever is in the tip of the upside-down "Y" pattern. This is nearest to the NEUTRAL position.Position sensor (5) for the speed/direction control lever converts the position of the lever into an electrical signal that is sent to the power train ECM. Power train ECM (11) sends current to the steering solenoid valves that corresponds to the speed that is selected by the operator and to the direction that is selected by the operator. The solenoid valves open proportionally to the electrical current that is sent in order to direct the signal oil to the drive pumps and the drive motors. When the speed mode switch is placed in the Work Mode position, speed is reduced to 70 percent of the normal speed. Normal speed is the speed that results when the speed mode switch is placed in the Travel Mode position.Steering Function
Illustration 30 g00975052
Right steering function (Right spot turn)Right pedal that is fully depressedPower train ECM (11) monitors the position of both of the steering pedals with the left and right steering pedal position sensors. The synchronizing valve is energized and open when the steering pedals are not pressed. This valve connects the FORWARD drive loops and the two REVERSE drive loops together. The equal flow ensures that the machine will track straight. As a pedal is pressed, the power train ECM reduces the speed of the appropriate track by reducing the electrical signal to the appropriate steering valves. The steering valves decrease the signal pressure to the drive motors and the drive pumps. The result is first an increase in