BASE AS 1049528 - Caterpillar

The pump displacement sensor is a hall effect type sensor and is used to measure the pump swashplate angle.For more information on the pump regulators, refer to Systems Operation, "Pump Control (Main Hydraulic)".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, a third 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 SensorSwitches
Pressure Switch
Illustration 8 g02332474Note: The values in Table 11 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 11
Activation Pressure 490 49 kPa (71 7 psi)
Deactivation Pressure 294 kPa (43 psi) MIN
Rating + 12V ~ +32V
0.01 Amp to 1 Amp
Pressure Range 0 to 10 MPa 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.Solenoids
On/Off Solenoids
Illustration 9 g01158530Note: The values in Table 12 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 12
Rated Voltage 24 VDC
Coil Resistance 32.0 3.2Ω (T=20° C) Rear Pump Bypass Cut PHMV and Front 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 front pump and rear pump bypass cut PHMVs control the standby pressure when all the joysticks are in the NEUTRAL position. When the activation lever is in the UNLOCKED position, the bypass cut PHMV's maintain standby pressure at a higher pressure than when the activation lever is in the LOCKED position.Hydraulic Lock Solenoid
The hydraulic lock solenoid is an output of the Machine ECM. The hydraulic lock solenoid is energized in order to enable the primary hydraulic pressure. The hydraulic lock solenoid is de-energized in order to disable the primary hydraulic pressure.This solenoid is activated while the key switch is in the ON position and the hydraulic lock lever is in the UNLOCK position.Flow Combiner PHMV
The flow combiner PHMV has three positions and is located within the main control valve. The combiner spool consists of the checked, closed, and open positions. The open position of the valve is to combine the flow from the rear pump and front pump into one hydraulic circuit. The valve spool is adjusted based on the position of the joysticks.Reference: For