CRANKSHAFT GP 1516301 - Caterpillar

The implement shutoff switch is a two pole switch. The switch has a normally connected and a normally open contact. When the switch is not depressed the normally connected contact is connected to the return, and the normally open contact floats to a high voltage state. When the switch is depressed, the normally open contact is connected to the return and the normally connected contact floats to a high voltage state. Based on the voltage state of the two ECM contacts, the ECM determines if the switch is depressed. The second pole on the switch allows the path of power from an ECM driver to flow through the switch to the shutoff solenoid.Cushion Hitch Filter Bypass Switch
Illustration 12 g03424806The cushion hitch filter bypass switch is a single pole pressure switch. When the switch is closed under normal operation, the ECM contact is connected to a return contact. When the hydraulic pressure exceeds a set point, the switch opens. When the switch opens, the ECM contact floats to a high voltage from the ECM pull-up voltage. When the switch opens, the ECM alerts the operator that the cushion hitch filter is being bypassed.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.On/Off Solenoids
Pilot Solenoid
Illustration 13 g03422260The pilot solenoid is an on/off type solenoid that acts to lock out the implement system. The solenoid is part of the implement valve group and prevents pilot hydraulic oil from flowing to the rest of the valve bank. When the solenoid is energized, the pilot oil is allowed to flow and the implement system is enabled.Note: The solenoid coils are not designed to operate using 24 DCV directly. The ECM sends a PWM signal of 24 V at a duty cycle that will provide the necessary current to the solenoid coils. Do NOT activate the coils by using 24 DCV (+battery). The life of the coils will be reduced drastically. A source of 12 DCV should be used, if the coils must be activated by not using the ECM.Cushion Hitch Enable Solenoid
Illustration 14 g03425512The cushion hitch enable solenoid is an on/off type solenoid. The ECM energizes the solenoid based on operator request. When the solenoid is energized, the cushion hitch system is activated.Proportional Solenoids
Illustration 15 g03347475All proportional solenoids in the implement system are identical in construction, however function differently. Illustration 15 shows an example of a proportional solenoid in the implement system.Note: The solenoid coils are not designed to operate using 24 DCV directly. The ECM sends a PWM signal of 24 V at a duty cycle that will provide the necessary current to the solenoid coils. Do NOT activate the coils by using 24 DCV (+battery). The life of the coils will be reduced drastically. A source of 12 DCV should be used, if the coils must be activated by not using the ECM.Cushion Hitch Leveling Solenoid
The cushion hitch leveling solenoid controls the movement of