4721890 Excavator Air Conditioning Controller for ZX130-5G

Part number 4721890 is the original air conditioning controller provided by Hitachi for the ZX130-5G hydraulic excavator. According to public information, the air conditioning controller of Hitachi excavators is usually universal according to the series, and the controller of ZX130-5G may also be compatible with 13-16 ton models on the same platform such as ZX120-5G, ZX140-5G, ZX160-5G, etc. The universal number includes 4721889, 4721891, etc
 

This product is an embedded air conditioning control panel (computer board), usually made of metal or high-strength plastic shell, with shockproof, dustproof, and anti electromagnetic interference design, suitable for the vibration and dusty environment of engineering machinery cab. The core functions include: receiving and processing operation instructions (such as temperature setting, air volume adjustment), monitoring indoor and outdoor temperature sensor signals, communicating with the vehicle ECU through CAN bus, and controlling actuators such as compressors, blowers, and air door motors. The typical working voltage is DC 24V, and the working temperature range is about -30 ℃ to+70 ℃. It supports multiple modes such as automatic, cooling, heating, dehumidification, and air supply.

Daily inspection: Check if the wiring harness is securely plugged in and if the panel buttons are sensitive every 250 working hours. Cleaning and maintenance: Regularly wipe the surface of the panel with a soft dry cloth to avoid using corrosive solvents. Fault diagnosis: If there is no display on the panel, button failure, or air conditioning not cooling/heating, the fuse (usually 10A), power supply voltage (24V ± 10%), and grounding wire should be checked first; Next, use a diagnostic tool to read the fault codes of the air conditioning system. Common problems may involve abnormal temperature sensors, CAN communication failures, and internal program errors.