TORQUE ADAPTER MAIN HYD.PUMP 1DE2395 - Caterpillar

Pump Pressure Solenoids
Power Shift Pressure Proportional Solenoid
Illustration 1 g01158469
"Power shift Presure Solenoid (Proportional)"The "Power Shift Pressure " Solenoid is used to control engine speed and pump pressure of the machine. The main functions of the solenoid, in conjunction with the monitoring system, are listed below:
The solenoid transfers engine power to hydraulic power as needed.
The system controls the output of the pump according to the workload, improving fuel efficiency.
The monitoring system decelerates the speed of the engine when the machine is in the no load condition."Swing Priority Solenoid"
The pump pressure solenoid is an output of the Machine ECM. The solenoid is a three-port pressure reducing valve. The solenoid is the proportional type. The ECM uses a pulse width modulated signal (PWM) to vary the current that is sent to the solenoid. The distance that is traveled by the solenoid valve is proportional to the electrical current. The position of the valve opens or the position of the valve blocks the flow of oil to the pump. When the solenoid is de-energized, the flow of the oil is blocked. The blocked oil flow causes the pump to destroke.Solenoid (ON/OFF)
Illustration 2 g01158530
"Travel Speed " Solenoid"Swing Brake Release" Solenoid"Hydraulic Lock Solenoid (Proportional)" "Travel Speed " Solenoid
The solenoid for "Travel Speed " is an output of the Machine ECM. When the solenoid for "Travel Speed " is active, the machine can travel at high speed. The solenoid for "Travel Speed" is active when the travel speed mode switch is set to "RABBIT (high)" mode. The travel speed also depends on the delivery pressure of the main pump. If the delivery pressure of the main pump is high, the solenoid for "Travel Speed " is de-energized. When the delivery pressure of the main pump is low, the solenoid for "Travel Speed " is energized. "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."Negative Flow Control 1 & 2 Pressure PRV"
The front half of the control valve receives supply oil from the drive pump. Negative flow control pressure from the front half of the main control