WINDOW-SLIDING 3033003 - Caterpillar

The transmission top gear switch (1) is a single pole switch that controls the top gear limit feature. The switch normally is open and the ECM contact floats to a high-voltage state. When the switch is closed, the ECM contact is pulled to a low voltage state.Transmission Charge Filter Bypass Switch
Illustration 12 g03320660The transmission charge filter bypass switch is a pressure switch. The switch alerts the ECM when the transmission charge filter is being bypassed. The contact floats to a high voltage when the switch is not closed. When the switch closes, the contact is pulled to a low or ground voltage state by the return line.Engine Retarding Lever
Illustration 13 g03425566The engine retarding lever acts a four position switch that controls the amount of engine retarding. There are three ECM contacts that are normally open, these contacts are closed and pulled to a low voltage state depending on the position of the lever.Differential Lock Switch
Illustration 14 g03425600The differential lock switch is a single pole switch. The switch is normally open and the ECM contact floats to a high-voltage state. When the switch is activated, the ECM contact is pulled to a low voltage state and the ECM detects an operator request to lock the differential.Transmission Hold Switch
Illustration 15 g03886287The transmission hold switch is a single pole switch located in the joystick. The switch has a normally open contact and a normally closed contact. When the switch is activated, the normally open contact closes and the normally closed contact opens. The ECM normally open contact is pulled to a low voltage state and the normally closed contact floats to a high-voltage state. The change in voltage state causes the ECM to hold the current transmission gear.Outputs
On/Off Solenoids
Differential Lock Solenoid
Illustration 16 g03425512The differential lock solenoid is an on/off type solenoid. The ECM energizes the solenoid based on operator request. When the solenoid is energized, the differential is locked.Proportional Solenoids
ECPC Solenoids
Illustration 17 g03319894
Each of these solenoid valves is designed to control the flow of to a clutch plate. When the solenoid is not engaged or receiving a low duty cycle signal, the solenoid does not allow power train hydraulic oil to engage a clutch plate. As the duty cycle of the signal to the solenoid increases, the solenoid allows some flow and the clutch begins to engage. When the duty cycle of the signal to the solenoid is at the maximum, the flow of power train hydraulic oil fully engages the clutch. The engagement of a clutch is proportional to the duty cycle of the signal sent by the ECM.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.Data Link
Electronic communication between the