Wheel loaders often face long-term idle situations due to seasonal construction, project suspension, equipment backup, and other reasons. Long-term idle without proper maintenance will lead to a series of problems such as battery power loss, fluid deterioration, seal aging, component corrosion, tire deformation, and electrical system failure. When the equipment is restarted, it is easy to have difficulty starting, oil leakage, poor action, and abnormal noise, which seriously affects the service life. This maintenance guide provides a complete set of sealing, anti-corrosion, storage, and reactivation commissioning schemes for long-term idle wheel loaders to ensure that the equipment can be quickly put into use after idle and reduce performance attenuation.
Preparations before long-term idle are the basis for maintaining equipment performance. First, conduct a comprehensive inspection and maintenance of the loader, deal with existing faults, replace worn parts, and ensure that the equipment is in good condition before storage. Thoroughly clean the whole machine, including the body, chassis, engine compartment, and hydraulic system, to remove mud, dust, and debris, preventing corrosion caused by accumulated dirt during idle.
The treatment of fluid systems is crucial. Replace engine oil, gear oil, hydraulic oil, and filter elements before long-term idle. Old oil contains impurities and acidic substances, which will accelerate the corrosion of components during long-term storage. After replacing the new oil, run the machine briefly to allow the new oil to circulate fully in the system. Fill the fuel tank to the full level to reduce air entry and prevent condensation water from forming inside the fuel tank. Add fuel stabilizer to prevent diesel oxidation and deterioration. Check the coolant, ensure the antifreeze performance meets the requirements, and prevent the cooling system from freezing and corroding in low-temperature seasons.
The battery is the most prone to power loss during idle. Disconnect the negative terminal of the battery to reduce self-discharge. If the idle time exceeds one month, remove the battery and store it in a dry, ventilated, and room-temperature environment. Charge the battery every 1 to 2 months to maintain its activity and prevent sulfation and capacity attenuation. Clean the battery terminals and apply anti-corrosion grease to avoid oxidation and poor contact.
Lubrication and anti-corrosion treatment of components. Fully lubricate all hinge points, pin shafts, and rotating parts with high-quality grease to form a protective oil film and prevent rust and corrosion. Coat anti-rust oil or anti-rust grease on unpainted metal surfaces such as buckets, booms, and chassis components to isolate air and moisture. For hydraulic cylinder rods exposed outside, clean them and apply a thick layer of anti-rust grease, then wrap them with waterproof paper or plastic film to prevent rust and scratch.
Tire and undercarriage protection. Inflate the tires to the upper limit of the standard air pressure to reduce deformation. Place wooden piers or brackets under the frame to lift the tires off the ground, avoiding long-term pressure causing tire deformation and rubber aging. Clean the gravel and mud between the track chains (for crawler loaders) to prevent corrosion and jamming. Properly relax the track tension to reduce the stress of the undercarriage components during idle.
Sealing and moisture-proof treatment of the whole machine. Close the doors and windows of the cab tightly, place moisture-proof agent or desiccant inside the cab to prevent moisture and mildew. Cover the engine exhaust pipe, air intake, hydraulic oil tank respirator, and other parts with a sealing cover to prevent dust, rain, and small animals from entering. Use a special waterproof and dustproof car cover to wrap the whole machine, especially for outdoor storage, to avoid sun, rain, and snow erosion.
Regular inspection during idle. Even in the idle state, regular inspection is required. Check the appearance of the equipment every 2 to 4 weeks to see if there is rain leakage, corrosion, or damage to the car cover. Check the tire pressure and battery status. In case of severe weather such as heavy rain and strong wind, timely check and reinforce the protective measures to avoid component damage.
Reactivation commissioning before restarting. Before the loader is officially put into use after long-term idle, systematic commissioning must be carried out. First, remove the protective cover, clean the whole machine, and install the battery. Check the liquid level of engine oil, coolant, hydraulic oil, and fuel, and replenish them in time if insufficient. Check all lubrication points and supplement grease. Check the appearance of hydraulic hoses, wires, and seals for aging and damage, and replace them if necessary.
Start the engine for idling commissioning. Start the engine and run it at idle speed for 10 to 15 minutes, observe the instrument parameters such as oil pressure and water temperature, and check for abnormal noise, smoke, and oil leakage. During idling, operate the boom, bucket, steering, and other mechanisms repeatedly to circulate the hydraulic oil and eliminate air in the system. Check the walking function, brake system, and lighting system to ensure flexible and effective action.
Load test and performance recovery. After the idling commissioning is normal, conduct a short-term low-load test run, and gradually increase the load to check the digging force, walking power, and lifting speed of the loader. Monitor the temperature changes of the engine, hydraulic system, and transmission system to ensure that all indicators are within the normal range. Only after all tests are qualified can the equipment enter formal operation.
In summary, long-term idle maintenance of wheel loaders focuses on comprehensive cleaning, fluid replacement, anti-corrosion and moisture-proof, and regular inspection. Scientific storage and reactivation commissioning can effectively avoid performance attenuation and component damage, ensuring that the loader can quickly restore normal working capacity after idle and extend the overall service life.
