4323698 Original Excavator Switch Box for EX220-3

The original switch box part number 4323698 is an electrical control assembly provided by Hitachi Construction Machinery for the EX220-3 22 ton hydraulic excavator (with a total working weight of approximately 22 tons). This switch box is mainly used for the main power distribution of equipment, protection of various system circuits, and operation control, integrating core electrical functions such as engine start-up, lighting, alarm, and control of working devices. Its universal model is usually directly labeled as 4323698 and is also applicable to EX200-3, EX220-2 and other series of models. It belongs to a protective metal enclosed structure, and the internal layout and wiring harness interface are designed exclusively by Hitachi. It is strictly prohibited to mix with auxiliary components to ensure the safety and reliability of the entire electrical system.

This product is an original electrical switch box, with a shell made of 1.5mm cold-rolled steel plate welded and formed. The surface is electrostatically sprayed with plastic, and the protection level is IP65 (dustproof and waterproof). Internally equipped with main circuit breaker (rated current 100-150A), electromagnetic contactor, relay group, fuse (5-30A), emergency stop button, indicator light (red/green/yellow) and terminal block, all components have passed CE and JIS certification. The box size is approximately 400 × 300 × 200mm, and the installation method is wall mounted. The inlet and outlet are equipped with waterproof gland heads and support steel pipe or cable wiring. The working voltage is DC24V and AC220V dual input, with an ambient temperature range of -30 ℃ to+70 ℃. It is suitable for harsh working conditions such as high vibration, high dust, and humidity in excavators.

Daily inspection: Open the box door every 250 working hours and check that all terminals are securely fastened and there is no wear or tear on the wiring harness; Clean the internal dust and oil stains (using dry compressed air). Functional testing: monthly testing of emergency stop button response, indicator light display, and circuit breaker trip reset; Use a multimeter to detect fluctuations in the DC24V power supply (allowable range 21-28V). Fault diagnosis: If there is no power in the entire vehicle, first check the connection between the main circuit breaker and the battery; If the local function fails, check the corresponding relay/fuse; If the box is leaking water, replace the sealing gasket immediately. Preventive replacement: It is recommended to conduct a comprehensive inspection of internal component contact erosion and coil aging every 5000 working hours; Relays and contactors have a lifespan of approximately 100000 actions and need to be replaced in advance according to their actual usage frequency.