Excavators operating in rocky, gravel, quarrying, and mining environments are in extremely abrasive working conditions for a long time. The hard rock particles have strong erosion and wear on the bucket, boom, arm, undercarriage parts, and hydraulic cylinder rods, which can easily lead to accelerated wear of parts, reduced working efficiency, oil leakage, and structural cracks. In such working conditions, the failure rate of excavators is much higher than that in ordinary soil scenarios, and the maintenance cost is also higher. This maintenance guide provides targeted wear resistance enhancement, daily maintenance, and repair measures for rocky and abrasive working conditions to prolong the service life of parts, reduce downtime, and improve the economy of equipment use.
The bucket and bucket teeth are the most severely worn parts in rocky conditions. The bucket is directly impacted and rubbed by rocks, and the bottom plate, side plate, and cutting edge are prone to wear and deformation. Bucket teeth are broken, worn, and lost frequently, which affects the digging efficiency. In order to enhance wear resistance, choose high-strength wear-resistant steel buckets and reinforced bucket teeth. Install wear-resistant plates and protective strips on the bottom and sides of the bucket to reduce direct wear. Use forged bucket teeth with high hardness and toughness, which have better wear resistance and impact resistance than ordinary cast bucket teeth. Check the bucket teeth every day. If they are worn to the limit or broken, replace them immediately to avoid damaging the tooth base. Tighten the bucket tooth lock to prevent the bucket tooth from falling off during operation.
The wear of the undercarriage parts is also very serious in rocky conditions. Track shoes, track chains, driving wheels, and supporting wheels are rubbed and impacted by gravel for a long time, resulting in accelerated wear, shortened service life, and increased walking resistance. Choose heavy-duty track shoes with increased thickness and wear-resistant design. Regularly check the wear degree of the driving wheel and track chain. If the tooth shape of the driving wheel is worn flat or the track chain is seriously elongated, replace it in time. Clean the gravel between the track and the supporting wheel every day to avoid jamming and increasing wear. Lubricate the supporting wheel, idler wheel, and track chain regularly to reduce friction and wear.
The hydraulic cylinder rod is easily scratched by rock particles, resulting in oil leakage. The scratch on the cylinder rod will damage the oil seal, leading to hydraulic oil leakage and affecting the normal operation of the cylinder. Install a protective cover or dust-proof ring for the cylinder rod to prevent rock particles from directly contacting and scratching the cylinder rod. During operation, avoid the cylinder rod from directly colliding with rocks. Check the surface of the cylinder rod every day. If there are small scratches, polish them smoothly with fine sandpaper in time. If the scratch is deep and serious, replace the cylinder rod or carry out repair treatment to avoid damaging the oil seal.
Structural parts such as the boom and arm are subjected to repeated impact loads in rocky conditions, and cracks are prone to occur at stress concentration parts. The impact generated by digging hard rocks will increase the fatigue stress of the welding parts of the boom and arm. Operators should avoid violent digging and forcibly prying rocks to reduce the impact load on the structural parts. Regularly check the boom, arm, and frame welding parts for cracks. If small cracks are found, carry out welding reinforcement in time to prevent the cracks from expanding and causing structural fracture.
The hydraulic system is easily affected by abrasive dust in rocky conditions. Dust enters the hydraulic oil tank through the respirator and cylinder rod, causing wear of the hydraulic pump, control valve, and other precision components. Strengthen the sealing of the hydraulic oil tank and use a high-efficiency respirator filter. Replace the hydraulic oil and filter element regularly, and shorten the replacement cycle appropriately in abrasive working conditions. Check the contamination degree of the hydraulic oil regularly. If the metal particle content exceeds the standard, carry out oil filtering or replace the hydraulic oil to avoid serious wear of the hydraulic system.
The engine air intake system is easy to enter a large amount of dust in rocky conditions, resulting in accelerated wear of the engine cylinder, piston, and other parts. Use a high-performance double-stage air filter and shorten the cleaning and replacement cycle of the air filter element. Check the air intake pipe for damage or loose connection to prevent unfiltered dusty air from entering the engine. Clean the dust in the air filter housing every day to ensure the normal air intake of the engine.
Operator operation habits have a crucial impact on reducing wear. In rocky conditions, avoid digging with the bucket side, forcibly prying large rocks, and continuously impacting the rock formation. When digging hard rocks, use the breaking hammer first to break the rocks into small pieces, and then carry out digging operations. Control the digging speed and amplitude to reduce the impact and friction between the bucket and the rocks.
Regular targeted maintenance is essential. Increase the frequency of lubrication, and lubricate each hinge point, pin shaft, and rotating parts every day. Check the tightness of bolts in key parts such as the bucket, boom, and undercarriage, and tighten them in time if loose. Carry out wear detection on key wearing parts every week, and replace them in advance when they reach the wear limit to avoid sudden failure during operation.
In summary, the maintenance of excavators in rocky and abrasive working conditions focuses on wear-resistant component upgrading, strengthening protection, strict daily inspection, and standardized operation. By taking targeted wear resistance enhancement and maintenance measures, the service life of parts can be effectively prolonged, the maintenance cost can be reduced, and the excavator can maintain high efficiency and reliability in harsh abrasive environments.
