Wheel loaders in quarries, mines, and stone yards operate in extremely harsh working conditions for a long time, facing high-hardness materials such as ore, granite, and basalt. These materials have strong abrasiveness and impact, which cause serious wear on the bucket, teeth, arm, chassis, and transmission system, and easily lead to structural deformation, cracking, and early failure of parts. This maintenance guide provides targeted wear reduction, reinforcement, and protection measures for hard material working conditions to prolong the service life of the loader and reduce comprehensive use costs.
Bucket reinforcement and wear protection are the top priority. The bucket is in direct contact with hard materials, and the bottom plate, side plate, and cutting edge are subject to severe friction and impact. It is recommended to use a reinforced rock bucket made of high-strength wear-resistant steel plate. Install wear-resistant strips, anti-abrasion blocks, and protective plates on the bottom and sides of the bucket to form a double protection layer. The welding process and material of the wear-resistant parts must be reliable to avoid falling off during operation. Regularly check the wear degree of the bucket; if the bottom plate is thinned or cracked, repair and reinforce it in time to prevent further damage.
Bucket tooth selection and replacement directly affect wear and efficiency. Ordinary bucket teeth wear quickly in hard material conditions and are easy to break. Forged rock bucket teeth with high hardness and toughness should be selected, which have better wear resistance and impact resistance. The tooth base should also be reinforced to avoid damage caused by frequent replacement of bucket teeth. Check the bucket teeth every shift; replace them immediately when they are worn to the limit or broken. Tighten the bucket tooth locking device to prevent loss during operation, which may cause equipment damage.
Lubrication of hinge points must be more frequent. The boom, arm, frame, and swing bucket cylinder joints bear huge impact loads, and the lubricating grease is easily squeezed out and contaminated by dust. Insufficient lubrication will cause severe wear of pin shafts and bushings, resulting in loose fit and shaking. Lubricate each hinge point with extreme pressure wear-resistant grease every 4 to 8 hours. Ensure that the new grease is extruded from the gaps to remove old grease and impurities.
The transmission system bears large impact loads and needs key protection. The impact generated by shoveling hard materials is transmitted to the gearbox, drive axle, and wheel reducer, which may cause gear damage, bearing wear, and oil leakage. Check the transmission oil and drive axle oil regularly; shorten the replacement cycle under harsh conditions. Pay attention to abnormal noise, vibration, and weakness during walking, which may be early signs of transmission system damage. Avoid violent shoveling and forced impact to reduce instantaneous impact load.
Tire wear and damage are serious in hard and sharp gravel conditions. Sharp ore fragments are easy to cut and puncture tires, and long-term friction on gravel surfaces accelerates tread wear. Use engineering-specific thickened wear-resistant tires with explosion-proof and cut-resistant functions. Check tire pressure daily; over-inflation or under-inflation will increase the risk of tire damage. Clean sharp stones embedded in the tire tread in time to avoid deepening cuts. For particularly harsh mines, tire protection chains can be installed to greatly extend tire life.
The engine intake and fuel system are easily affected by a lot of dust. Quarry and mining areas have high dust concentration, which easily blocks the air filter and causes insufficient air intake, power reduction, and engine wear. Use a double-stage high-efficiency air filter and clean or replace the filter element frequently. Check the fuel water separator and oil-water separator every day to drain water and impurities. Use high-quality diesel oil to avoid injector blockage and abnormal combustion.
Structural crack prevention is crucial. Long-term impact loads may cause cracks at the welding joints of the frame, boom, and arm. Operators should avoid shoveling materials with the bucket side, forcibly prying large stones, and continuous impact operations, which will cause excessive stress concentration. Regularly inspect key welding parts; if small cracks are found, stop the machine immediately and carry out repair welding reinforcement to prevent crack expansion and structural fracture.
Hydraulic system anti-pollution and anti-overheating maintenance. Dust and particles entering the hydraulic system will cause wear of the hydraulic pump, valve, and cylinder, leading to internal leakage and slow movement. Strengthen the sealing of the hydraulic oil tank and replace the filter element regularly. The hydraulic oil temperature is easy to rise under continuous high load; keep the hydraulic oil cooler clean and unobstructed. If the oil temperature is too high, stop the machine for cooling to avoid accelerated aging of seals and oil deterioration.
Operator operation habits directly affect equipment wear. In hard material conditions, smooth operation is the key to reducing wear. Do not increase the throttle violently when shoveling; use a combination of shoveling and lifting to reduce impact. Avoid long-term full-load continuous operation and arrange appropriate rest intervals. Reasonable operation can reduce wear by more than 30% and significantly prolong the overhaul cycle.
In summary, the maintenance of loaders in quarry and mining hard material conditions focuses on wear-resistant component reinforcement, frequent lubrication, tire protection, and standardized impact-avoidance operation. Taking targeted maintenance and protection measures can effectively reduce wear and failure, ensuring that the loader maintains stable performance in harsh working conditions.
