TUBE AS 3866771 - Caterpillar

Variable Flow Control - Rotate the dial in a clockwise direction in order to increase the flow of the additive. Rotate the dial in a counterclockwise direction in order to decrease the flow of the additive. (12) Flow Display
The meter displays the flow of the additive in gallons per minute.Speed Sensor
The speed sensor produces a square wave type signal. A square wave is produced with every gear tooth. The speed of the gear determines the frequency of the signal.The sensor is mounted on the transmission gearbox and the sensor's signal is shared with the speedometer. The sensor has an output frequency of 175 pulses per foot (574 pulses per meter) for the 250 models. The sensor has an output frequency of 338 pulses per foot (1109 pulses per meter) for the 350 models.Note: When the machine is selected during setup, the pulses per foot are selected automatically.Flow Meter
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Location of flow meter for 250 models
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Location of flow meter for 350 models The flow meter utilizes a transistor to switch the signal circuit to ground. Therefore, a 1.8 kê resistor is used in conjunction with the meter. The meter has a 3.19 Hz output for every gallon per minute (0.842 Hz for every Liter per minute).The control analyzes the signal from the meter in order to calculate the volume per minute and the volume per area.Forward/Reverse Relay
The forward/reverse relay is energized by the circuit for the backup alarm.When the AUTO mode is selected and the forward/reverse relay is energized, the control will close the spray bar valves. The recirculation valve will open and the control will adjust the volume per minute. The accumulated flow will stop recording.Solenoid For The Spray Bar On/Off Valve
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On/Off solenoid valve for the spray bar for the 250 models
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On/Off solenoid valve for the spray bar for the 350 models The control supplies + battery voltage to the solenoid for the spray bar on/off valve. The solenoid actuates the spray bar on/off valve which controls an hydraulic cylinder. The cylinder mechanically opens the spray bar valves and the cylinder mechanically closes the spray bar valves. When the spray bar valves are opening, the recirculation valve is closing.Solenoids For The Variable Hydraulic Pump For The Additive Spray System
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Location of solenoids for the variable hydraulic pump for 250 models
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Location of solenoids for the variable hydraulic pump for 350 modelsThe control supplies a proportional signal to the solenoids for the variable hydraulic pump for the additive spray system. The solenoids control the swashplate of the variable hydraulic pump. The hydraulic pump controls the hydraulic motor for the additive spray system. The hydraulic motor drives the emulsion pump.Modes Of Operation
The Additive control recognizes the following modes of operation from the operator console.
"OFF" mode
"MANUAL" mode
"AUTO" mode
"RECIRCULATE" mode
"CLEAN OUT" mode"OFF" Mode
The control ignores all inputs and the control sends a null signal to the hydraulic pump. The hydraulic pump produces no output in this mode."MANUAL" Mode
The operator is responsible for setting the appropriate application rate. The spray