HOSE AS 3481264 - Caterpillar

Drive Pump Pressure Sensor and Idler Pump Pressure Sensor
The drive pump pressure sensor and idler pump pressure sensors are inputs to the machine ECM. The drive pump and idler pump pressure sensors are located on the main control valve. The drive pump pressure sensor monitors the pressure of the drive pump oil in the top half of the main control valve high-pressure passages. The idler pump pressure sensor monitors the idler pump oil pressure in the bottom half of the main control valve high-pressure passages. The pressure sensors send a pulse width modulated (PWM) input to the machine ECM. This pressure information is used for pump control and travel speed.ACS Valve Pressure Sensors
The Adaptive Control System (ACS) main control valve uses two independent electronic control modules (ECM) to monitor hydraulic pressure used for the boom, stick, bucket, and swing machine functions. The ACS valve ECMs use this pressure information as an input to the ACS control algorithm.Note: If the machine is equipped with tool control, an attachment ACS ECM will be installed on the main control valve.The following sensor is monitored by the machine ECM:
Swing Pressure SensorThe following sensors are monitored by ACS ECM 1:
Boom Extend Pressure Sensor
Boom Retract Pressure Sensor
Bucket Extend Pressure Sensor
Bucket Retract Pressure SensorThe following sensors are monitored by ACS ECM 2:
Stick Extend Pressure Sensor
Stick Retract Pressure Sensor
Attachment 1 Left Pressure Sensor
Attachment 2 Right Pressure SensorOutputs
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.Solenoids
On/Off Solenoids
Illustration 6 g01158530Note: The values in Table 14 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 14
Rated Voltage 24 VDC
Coil Resistance 32.0 3.2Ω (T=20° C) Stick Side Warm Up Solenoid and Boom Side Warm Up Solenoid
Warm-up solenoids are part of the automatic hydraulic warm-up feature and can only be activated with the hydraulic activation lever is in the LOCKED position. The temperature of the hydraulic fluid is monitored by the Machine ECM. If the Machine ECM determines the hydraulic fluid is below the desired temperature, the warm-up solenoids will be energized. The solenoids direct the flow of oil in each of the circuits through an orifice. The increased pressure created by the orifice causes the hydraulic oil to warm up. The oil is passed through the system and returned to the hydraulic tank until the desired temperature is reached.The hydraulic warm-up function can be ENABLED or DISABLED in the monitor.Drive Pump Bypass Cut PHMV and Idler Pump Bypass Cut PHMV
The pump bypass cut PHMV's are proportional hydraulic modulation valves that adjust the opening of the valve stem based on the inputs to the Machine ECM. The Machine ECM uses the joystick position sensor to determine the position of the bypass valve stem. When the operator is not requesting an implement operation, the hydraulic oil flows through the bypass cut valve stems and returns to the hydraulic tank.The drive pump and idler pump bypass