345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Solenoid Valves Caterpillar


Solenoid Valves
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1.1. Proportional Reducing Solenoid Valve
2.1. Solenoid Valves

Proportional Reducing Solenoid Valve




Illustration 1g00670926

Pilot Oil Manifold Compartment

(1) Fine Control Solenoid Valve

(2) Travel Speed Solenoid Valve

(3) Swing Priority Solenoid Valve

(4) Proportional Reducing Valve

The proportional reducing solenoid valve changes the electrical signal from the controller into a hydraulic signal for the hydraulic pump. The hydraulic signal (power shift pressure) is used to regulate the output of the hydraulic pump. The controller varies the current (PWM signal) to the solenoid and the solenoid valve modulates the power shift pressure. The controller varies the current to the solenoid according to the selected power mode and the engine speed.

Solenoid Valves




Illustration 2g00666610

Schematic Symbol Of A Solenoid

The solenoid valve is designed to direct the flow of hydraulic oil through the hydraulic system. The controller will activate the proper solenoid valves according to the input from switches on the monitor panel and the pressure switches in the hydraulic system of the machine. When the solenoids are activated, a solenoid receives ground from the controller. The travel speed solenoid valve is activated when "HIGH" is selected in the travel speed mode. The "rabbit" travel speed indicator is illuminated when this mode is active. The fine control solenoid valve and the trenching solenoid valve are designed to provide easy fine control and trenching operations. The solenoids have a connector with two contacts.

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