BOLT 1540385 - Caterpillar

Counterweight Control
Illustration 5 g03869497The counterweight control sensor is the proportional thumb rocker located on the implement control handle. The sensor is an active pulse width modulated position sensor. The ECM interprets the pulse width modulated signal as a specific position on the thumb rocker. The thumb rocker controls the counterweight. A thumb rocker position to the left corresponds with a retract movement in the counterweight cylinders. A thumb rocker position to the right corresponds with an extend movement in the counterweight cylinders.Switches
Switches provide an open signal, a ground signal, or a +battery signal to the inputs of the ECM. Switches are open or closed.
When a switch is open, no signal is provided to the corresponding input of the ECM. The “no signal” condition is also called “floating”.
When a switch is closed, a ground signal or a +battery signal is provided to the corresponding input of the ECM.Implement Lockout Switch
Illustration 6 g03346014The implement lockout switch is designed to de-energize the implement lockout solenoid. The ECM will provide power to the solenoid through the implement lockout switch. The circuit is open and the implement lockout solenoid is de-energized, when the switch is placed in the LOCKED position. The switch should be in the LOCKED position before any of the following conditions occur:
The operator exits the machine.
The machine is serviced.
The machine is left unattended.The switch affects the system in the following manner:LOCKED - The implement lockout solenoid is de-energized. The implement system is no longer operable.UNLOCKED - The implement lockout solenoid is energized. The implement system is enabled.The switch is a single-pole rocker switch. The switch has a normally closed contact and a normally open contact. One contact connects to the switch input of the ECM. The other contact connects to the feedback input of the ECM and to the lockout solenoid. The pole of the switch connects to the output of the ECM for the implement lockout solenoid. The ECM can always determine whether the switch is in the LOCKED position or the UNLOCKED position. The two input circuits are used for diagnostic purposes. The ECM will detect a failure in the circuit if the two circuits of the switch are ever in the same state. The ECM will also record a diagnostic code. The diagnostic code that is associated with the implement lockout switch is CID 0490.Boom Kickout Switch
Illustration 7 g03867085The boom kickout switch is a double-pole rotary style switch. A centering spring holds one pole in the normally open position and at the same time holds the other in the normally closed position. If the switch is activated, the normally open pole closes and the normally closed pole opens. The ECM will send a signal to the winch pump telling the pump to stop. Until the switch is reset, the operator can only give commands to lower the boom.Outputs
The ECM responds to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician.Proportional Solenoids
Illustration