4658936 Original Excavator Evaporator for ZX200-3

Part number 4658936 is the original air conditioning evaporator provided by Hitachi for the ZX200-3 hydraulic excavator. According to the Hitachi parts system rules, this component is widely applicable to ZX110-3、ZX120-3、ZX130-3、ZX140W-3、ZX145W-3、ZX160LC-3、ZX350H-3、ZX400W-3  Equivalent series models, as well as multiple models such as MA200, ZX210-3, ZX240-3, ZX250-3, ZX330-3, ZX350-3, etc. Its universal number (substitute part number) includes 4658937, 4719198, etc., but the use of non-standard spare parts is strictly prohibited to avoid poor cooling or damage to the air conditioning system.

This product is a Hitachi pure air conditioning evaporator, which is the only key component in the refrigeration cycle that generates cooling capacity. Usually, aluminum alloy or copper tube fin structure is used, which absorbs heat through refrigerant evaporation inside the tube, exchanges heat with the air flowing through the fins, and provides cold air for the cab. Its heat exchange efficiency directly affects the cooling capacity and energy consumption performance of the system. Hitachi pure evaporators have significant advantages in sealing, corrosion resistance, and heat transfer efficiency. The internal flow channel design is optimized to ensure uniform distribution and sufficient gasification of the refrigerant.

Replacement cycle: It is recommended to check every 2-3 years or 3000-5000 working hours, or promptly repair or replace according to the symptoms of air conditioning cooling effect decline, reduced air output, evaporator icing/frosting, etc. Daily inspection: Check if the air conditioning filter is clean every month, check if the evaporator fins are clogged with dust or debris every quarter, and check if the condensate drainage is unobstructed. Fault manifestations: Evaporator failure may lead to insufficient cooling, cold air outlet, inability to lower the temperature inside the cab, ice formation on the evaporator surface (frosting on the internal unit), high pressure alarm of the air conditioning system, etc. Common causes include: clogged air conditioning filters, insufficient or leaking refrigerant, abnormal fan operation, and control system failures. Cleaning steps: 1 Disconnect the power and turn off the air conditioning system; 2. Disassemble the air conditioning filter and evaporator housing; 3. Use a soft bristled brush or low-pressure airflow to remove dust from the surface of the fins; 4. If there is oil stains, special air conditioning cleaning agent can be used to spray, and after standing, rinse with water (pay attention to protecting the circuit); 5. Clean the drainage channel to ensure smooth flow; 6. Reinstall the filter and casing, and restore the power test.