CRANKSHAFT AS 2706177 - Caterpillar

Pump Displacement Sensor
Illustration 6 g03235271
Illustration 7 g03235722
The values in Table 7 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 7
Rotational Range     24.15° Angular Rotation    
Output Signal     500 100 Hz    
Output PWM     8% - 92%    
Rating     + 7V ~ +12V DC    The pump displacement sensor is a hall effect type sensor and is used to measure the pump swashplate angle. The machine ECM uses the pump displacement sensor input to determine the output current that is sent to the ESP pump solenoid valves. The ESP pump solenoids then change the angle of the swashplate to meet the required hydraulic flow demands.For more information on the pump regulators, refer to Systems Operation, "Pump Control (Main Hydraulic)".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 8 g01158530
The values in Table 8 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 8
Rated Voltage     24 VDC    
Coil Resistance     32.0 3.2Ω (T=20° C)    Swing Priority Solenoid
When swing priority is activated, the output flow from the idler pump supplies hydraulic oil to the swing hydraulic circuit. Since swing priority increases the swing acceleration, swing priority is useful for loading operations. Swing priority is also useful for leveling operations and trenching operations when higher swing force is required.The machine ECM uses the swing control pressure sensor to control the swing priority solenoid. Whenever the pilot pressure exceeds 2750 kPa (400 psi) the machine ECM de-activates swing priority solenoid in order to enable swing priority.For more information on the swing priority solenoid, refer to Systems Operation, "Swing System".Swing Brake Solenoid
The swing brake solenoid is an output of the Machine ECM. The swing brake solenoid is energized in order to release the swing brake. When the swing brake is released, the upper structure is free to rotate. The swing brake is released when the control levers are actuated. The swing brake solenoid is de-energized approximately 6.5 seconds after any lever is moved to NEUTRAL 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.ESP Pump Solenoid Valve
Illustration 9 g03236478
The values in Table 9 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 9
Rated Voltage     24 V    
Coil Resistance     5 0.3Ω (T=25° C)
5 0.3Ω (T=25° C)    The ESP pump solenoid valve is located on the drive pump and idler pump regulators. The solenoid valve controls the horsepower control spool in the pump regulator. The machine ECM sends a PWM