HOSE AS 1378264 - Caterpillar

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.On/Off Solenoids
Illustration 5 g01158530
Table 5
Rated Voltage 24 VDC
Coil Resistance 32.0 3.2Ω (T=20° C) Straight Travel Solenoid
The straight travel solenoid is energized to maintain straight travel even though a swing operation or implement operation is performed during travel.The straight travel solenoid ensures straight travel of the machine when other circuits are operated during travel. The machine ECM recognizes the input status of the right travel pressure switch, left travel pressure switch, and the implement pressure switch. When all three pressure switches are activated to the ON position, the machine ECM activates the straight travel solenoid. Straight travel is now maintained.For more information on the straight travel solenoid, refer to Systems Operation, "Control Valve (Straight Travel)".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".Reverse Proportional Reducing Solenoid Valve
Reverse PRV's have the P-port open to the A-port with no current applied. Therefore, the machine ECM applies current to the PRV in order to decrease the pressure at the A-port.Proportional Reducing Solenoid Valve
Illustration 6 g02703776
Table 6
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C) Power Shift Pressure PRV
The power shift pressure PRV is used to destroke the main pump under load to maintain engine speed. The main functions of the PRV, in conjunction with, the monitoring system, are listed below:
The PRV manages the transfer to engine power into hydraulic power as needed.
The system control the output of the pump according to the workload, improving fuel efficiency.Negative Flow Control 1 Limit PRV and Negative Flow Control 2 Limit PRV
Two proportional reducing valves for negative flow control are used to control the amount of NFC signal to the pump regulators. The machine ECM receives various input signals to control the flow limitation from the main hydraulic pumps. When the NFC valves are energized by the machine ECM, pilot oil pressure is directed to the main hydraulic pump regulators from the pilot manifold. The pilot oil pressure causes the hydraulic pumps to destroke which reduces hydraulic oil flow.Reverse Proportional Reducing Solenoid Valve
Illustration 7 g02304374
Valve cutaway, hydraulic schematic symbol, and electrical connector designation
Table 7
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C) Boom Regeneration PRV
The boom regeneration PRV is used in order to control the amount of regeneration oil in the boom circuit. The machine ECM receives