Wheel loaders often face high-load, continuous operation in high-temperature summer environments, leading to frequent failures such as engine overheating, hydraulic oil overheating, bubbling coolant, accelerated seal aging, and electrical system malfunctions. High-temperature weather places extreme stress on loader performance and reliability. This special maintenance guide targets high-temperature season operation, providing comprehensive prevention, daily care, and emergency handling measures to ensure stable operation, reduce downtime, and extend service life.
Engine overheating is the most common failure in high temperatures. The main reasons include blocked radiators, insufficient coolant, faulty thermostats, loose fan belts, and prolonged heavy loads. In summer, dust, cotton fibers, and debris easily adhere to radiator fins, severely reducing heat dissipation. Maintenance personnel must clean the radiator and hydraulic oil cooler frequently using low-pressure compressed air, blowing from the inside out to avoid damaging fins. Before the arrival of high-temperature season, a thorough cleaning is essential.
Coolant management is critical in summer. Use long-life, high-boiling-point coolant specified by the manufacturer to prevent boiling and cavitation. Check the coolant level daily when the engine is cold; never open the radiator cap when the engine is hot to avoid scalding. If coolant frequently decreases, check for leaks in the water tank, water pipe, pump, and cylinder gasket. Old or deteriorated coolant must be completely replaced to prevent scale formation, which blocks pipes and worsens overheating.
The fan belt drives cooling and must be in good condition. High temperatures accelerate belt aging, cracking, and loosening. Check tension weekly; excessive deflection reduces fan and water pump speed, leading to overheating. Replace belts showing cracks, glazing, or slipping.
Prolonged high-load operation in hot weather easily causes overheating. Operators should avoid continuous full-load digging and transportation. Properly control working hours, allow short idling periods for cooling, and avoid sudden accelerations. In extremely hot conditions, reduce continuous operation time appropriately.
Hydraulic system overheating is another common problem. High-temperature environments plus heavy loads cause hydraulic oil temperature to rise rapidly, accelerating seal aging, reducing oil viscosity, and causing internal leakage, slow movement, and weak force. The hydraulic radiator must be kept clean. Use high-quality anti-wear hydraulic oil with good high-temperature stability. Check oil level daily; insufficient oil reduces heat dissipation. Avoid prolonged idling with the boom raised, as this increases system pressure and heat.
High temperatures accelerate rubber seal aging, leading to oil leakage in hydraulic, fuel, and lubrication systems. Before summer, inspect all hoses, seals, and O-rings. Replace hardened, cracked, or swollen parts to prevent leaks during high-temperature operation. Tighten pipe joints properly, as thermal expansion may cause loosening.
Battery performance is affected by high temperatures. Check electrolyte level for lead-acid batteries; replenish distilled water if necessary. Clean terminals to prevent corrosion. High temperatures accelerate battery self-discharge and shorten life. Avoid placing batteries near heat sources. For electric loaders, monitor battery temperature closely and avoid charging in direct sunlight or high-temperature environments.
Air filter maintenance becomes more important in hot, dusty conditions. A clogged filter restricts airflow, causing incomplete combustion, black smoke, power loss, and increased heat. Clean or replace the filter element more frequently in summer. Operate in dusty areas with extra caution to prevent dust from entering the engine.
Operator habits directly affect high-temperature reliability. Avoid overloading, violent operation, and long-term idling. Warm up the engine before working and allow cooling before shutdown. Pay attention to instrument readings; stop immediately if temperature or pressure is abnormal.
Emergency handling for overheating: if the engine overheats, do not shut down immediately. Idle the engine, turn on the heater to assist heat dissipation, and wait for temperature to drop. Check coolant level only after cooling. Do not add cold water suddenly to a hot engine to avoid cylinder cracking.
In summary, high-temperature season loader maintenance focuses on heat dissipation system maintenance, fluid management, seal inspection, and reasonable operation. Strengthening preventive maintenance before summer and strictly implementing daily inspections can effectively avoid high-temperature failures, ensuring stable and efficient operation throughout the summer.
