In high-temperature and drought environments such as deserts, summer construction sites, and drought-stricken areas, excavators face severe challenges of continuous high temperature, strong solar radiation, and dust. The cooling system is prone to failure, leading to engine overheating, hydraulic oil temperature soaring, boiling coolant, and even shutdown. High temperature accelerates oil deterioration, seal aging, and component wear. This guide provides intensive maintenance measures for the cooling system and anti-overheating protection to ensure stable operation in extreme high-temperature environments.
The cooling system is the core of anti-overheating and must be comprehensively maintained. Before entering high-temperature operation, thoroughly clean the radiator, intercooler, air conditioning condenser, and hydraulic oil cooler. Dust, cotton wool, and sand blocking the radiator fins are the main causes of poor heat dissipation. Use compressed air or low-pressure water to clean from the inside out, removing all debris. Check for bent or blocked fins and repair them to ensure smooth air flow.
Use high-quality, high-boiling-point coolant. Ordinary coolant has a low boiling point and easily boils at high temperatures. Choose long-life, high-boiling-point (above 110°C) antifreeze suitable for high-temperature environments, with excellent anti-corrosion and anti-scale properties. Check the coolant level, concentration, and quality daily; replenish or replace it in time. Avoid using water instead of coolant, which causes scaling, corrosion, and boiling.
Check the thermostat and cooling fan system. A faulty thermostat that cannot fully open will cause poor coolant circulation and overheating. Test and replace the thermostat in advance if necessary. For hydraulic drive fans, check the fan motor, control valve, and oil circuit to ensure the fan speed increases with temperature. For electronic fans, check the temperature sensor and control module. Ensure the fan operates at maximum speed under high load to provide sufficient air volume.
Inspect the water pump and coolant circulation system. A worn or faulty water pump leads to insufficient circulation, causing overheating. Check the water pump for leakage, abnormal noise, and loose bearings. Check the coolant hoses for aging, cracks, or blockage; replace damaged hoses. Remove scale from the cooling system regularly to improve circulation efficiency. Ensure the coolant tank cover is intact with good pressure retention to increase the boiling point.
Engine fuel and intake system maintenance prevents overheating caused by insufficient combustion. In high-temperature environments, the engine is prone to delayed ignition, incomplete combustion, and increased heat generation. Use high-quality diesel oil and check the fuel injector for clogging or poor atomization. Clean or replace the air filter frequently to ensure sufficient air intake. Adjust the fuel injection advance angle appropriately to optimize combustion and reduce heat accumulation.
Hydraulic system anti-overheating maintenance. High-temperature environments and continuous load cause hydraulic oil temperature to rise sharply, accelerating seal aging and oil deterioration. Clean the hydraulic oil cooler regularly to ensure heat dissipation. Use high-viscosity-index, high-temperature-resistant hydraulic oil with good anti-oxidation properties. Shorten the hydraulic oil and filter replacement cycle. Avoid continuous high-load operation; stop for cooling if the oil temperature exceeds 95°C. Check for internal leakage in pumps, valves, and cylinders, which generate extra heat.
Engine oil management extends service life. High temperature accelerates engine oil oxidation and deterioration, reducing lubrication. Use full synthetic high-temperature resistant engine oil and shorten the replacement cycle. Check the oil level and quality daily; replenish or replace it in time. Avoid overloading operation to reduce engine load and heat generation.
Cab and electrical system heat protection. High temperature affects the driver and electronic components. Ensure the air conditioning system operates normally, clean the condenser and evaporator, and check refrigerant pressure. Insulate and protect the engine control module, sensors, and wiring harness to avoid high-temperature damage. Use sunshades on the cab to reduce solar radiation and lower internal temperature.
Daily operation specifications reduce overheating risk. Avoid continuous full-load operation in high-temperature periods; arrange rest intervals. Start the engine at medium idle speed to warm up before loading. Do not turn off the engine immediately after high-load operation; idle for 3–5 minutes to allow gradual cooling. Park the excavator in a cool and shaded place when resting to avoid sun exposure.
Regular high-temperature special maintenance. Conduct a comprehensive cooling system inspection every week, including radiator cleaning, coolant replacement, thermostat testing, and fan system checking. Check for oil leakage, coolant leakage, and abnormal temperature. Deal with hidden dangers in advance to avoid sudden overheating failures.
In summary, the key to excavator maintenance in high-temperature and drought environments is comprehensive cooling system cleaning, high-quality coolant, fan system optimization, and hydraulic oil management. Strict implementation of anti-overheating measures can ensure stable operation and extend service life in extreme high temperatures.
