3074223 Original Excavator Level Gauge for ZX330-3

The original liquid level gauge part number 3074223 is a liquid level monitoring component provided by Hitachi Construction Machinery for the ZX330-3 series hydraulic excavator (with a total working mass of approximately 32 tons and a rated power of 202 kilowatts). This level gauge is mainly used for fuel tanks, hydraulic oil tanks, or engine oil pans to display real-time oil inventory and prevent equipment damage caused by low oil operation. Its universal models usually cover models in the ZX330-3G, ZX330-5A series, as well as similar tonnage excavators such as ZX350 and ZX370. As an integrated sensor from the original factory, it is deeply matched with the vehicle's electrical system. The use of non-standard auxiliary components is strictly prohibited to ensure measurement accuracy and system reliability.

This product is an original liquid level gauge/sensor, which may use float, capacitor, or ultrasonic principles depending on the application medium. Typical technical parameters: measurement range 0-1000mm, output signal 4-20mA or resistance value, working voltage DC 12-24V, protection level IP67. Float type liquid level gauges are usually composed of stainless steel floats, magnetic spring switches, and transparent tubes; The electronic level gauge is equipped with a ceramic capacitor core or a piezoresistive sensor, with an accuracy of ± 1% FS. It complies with standards such as ISO 10397 and GB/T 14048, and can withstand temperatures ranging from -40 ℃ to+125 ℃, as well as vibration and impact conditions. It has explosion-proof and anti-corrosion characteristics.

Inspection cycle: It is recommended to check the liquid level gauge for accurate display and loose wiring every 250 working hours; Clean the surface of the sensor probe every 500 working hours to prevent oil stains from adhering. Installation points: 1 Confirm the installation thread specifications (such as M18 × 1.5 G1/2）； 2. Vertical installation (to avoid measurement errors caused by tilting); 3. Connect wires according to polarity (positive and negative poles cannot be reversed); 4. After installation, add medium to calibrate the zero point. Fault diagnosis: If there is unstable display, no signal output, or false alarm, check whether the liquid level gauge probe is contaminated, the float is stuck, or the circuit board is damaged; If the deviation from the dashboard reading is greater than 5%, it should be replaced immediately. Preventive maintenance: It is recommended to replace the liquid level gauge as a whole every 3000 working hours; Regularly inspect the cable sheath to prevent wear and aging. Safety regulations: Before operation, the negative terminal of the battery must be disconnected and carried out in an environment free of static electricity and open flames; Dispose of waste level gauges according to electronic waste standards. Always use genuine original parts and operate according to the maintenance manual to ensure the long-term stable operation of the oil monitoring system.