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RING-RETAINING 4646346 - Caterpillar

4646346 RING-RETAINING Caterpillar parts RING
Alternative (cross code) number:
Caterpillar 4646346 RING-RETAINING
Weight: 0.25 pounds 0 kg.

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Solenoid Valve (Parking Brake)
Illustration 1 g00794020
Parking Brake Valve Group (1) Outlet line to the parking brakes (2) Parking brake solenoid (3) Pilot solenoid (4) Return line to the tank (5) Charge oil line from the front pump (6) Charge oil line from the rear pumpThe parking brake solenoid valve disengages the brakes. The brakes are applied by a spring and released by pressure. When the operator activates the parking brake switch, the ECM disengages the parking brake solenoid valve which relieves the hydraulic pressure and the brakes are applied. The brakes are released when the solenoid is engaged. The solenoid is always disengaged when the neutral interlock is active. The neutral interlock must be released and the transmission joystick is not in neutral in order for the parking brake solenoid to be engaged. The solenoid will not be engaged under the following conditions:
The park brake lockout configuration is locked.
A stall test is attempted
The electronic pressure override calibration is attempted.Transmission Pilot Supply Solenoid
The transmission pilot supply solenoid provides hydraulic pilot oil to the hydrostatic pumps and the motors as well as the park brake solenoid. The ECM only engages the transmission pilot supply solenoid if the neutral interlock has been cleared. If the transmission pilot supply is not energized, there is no oil to the transmission and the machine cannot be moved. The ECM also disengages this solenoid during a fault that requires the machine to shut down. Solenoid Valves (Pump and Motor Displacement Control)
Illustration 2 g00839868
Forward Solenoid for the Left Drive Pump Reverse Solenoid for the Left Drive PumpReverse Solenoid for the Right Drive Pump Forward Solenoid for the Right Drive Pump Proportional Solenoid of the Right Drive Motor Proportional Solenoid of the Left Drive MotorThe four solenoid valves for the drive pumps are outputs of the ECM. The ECM uses these solenoid valves to control the speed and the direction of the machine by varying the pump displacement. The two solenoid valves for the drive motors are outputs of the ECM. The ECM uses these solenoid valves to control the machine speed by varying the motor displacements. The ECM applies electrical current to the appropriate solenoid valves. This electrical current is based on the information from the following devices:
The Joystick forward/neutral/reverse Position
The Joystick Thumbrocker Position
The Joystick Steering Position Status
The Parking Brake Switch
The Engine Speed Sensor
The Left Track Speed Sensor
The Right Track Speed Sensor
The Brake/Decel PedalThe solenoid valves are pressure reducing valves. The solenoids are the proportional type. The ECM uses a pulse width modulated signal (PWM) to vary the current to the solenoid. The current varies the pressure output of the solenoid valve. The amount of pressure controls the swashplate angle of the pumps and motors. Relays
Start Relay (Magnetic Switch)
Illustration 3 g00785967
The start relay is an on/off solenoid that controls the starting motor. When the relay is not energized, the starting motor is not running. When the relay is energized, the starting motor is running. Relay (Starting Aid)
Illustration 4 g00875516
The starting aid relay is an attachment that enhances the starting

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