Wheel loaders in quarries and mines work in harsh conditions with hard rock, high impact, and severe abrasion for a long time. The bucket, teeth, frame, hinge points, and transmission system bear huge impact and wear, which can easily lead to cracking, tooth breakage, tire damage, and early failure of key components. This guide provides targeted anti-impact, wear-resistant, and reinforced maintenance measures to extend the service life of loaders in hard rock conditions.
Bucket and tooth wear and impact resistance are the core of maintenance. Use reinforced wear-resistant buckets and forged high-strength bucket teeth with high hardness and toughness. Check the wear of bucket teeth, side cutters, and bottom plates daily, and replace them in time when the wear reaches 50% to avoid increased fuel consumption and structural stress. Build up hardfacing welding on the severely worn parts of the bucket to improve wear resistance. Avoid forcibly shoveling un-blasted large rocks to reduce impact load.
Frame and structural part anti-crack maintenance. Long-term impact and vibration easily cause cracks in the front frame, rear frame, and boom. Check welds and stress concentration parts daily for cracks; stop using and repair them immediately if found. Reinforce key welds during regular maintenance. Avoid sudden lifting, sharp turning, and impact shoveling to reduce fatigue damage.
Transmission system and drive axle anti-impact protection. Hard rock conditions have frequent load changes and strong impact, which easily damage the gearbox, torque converter, and drive axle. Use high-viscosity extreme pressure gear oil and shorten the oil change cycle. Check the transmission oil temperature, pressure, and abnormal noise daily. Avoid starting and stopping with heavy load to reduce impact on gears and bearings.
Tire anti-puncture and anti-abrasion protection. Use engineering radial tires with thickened sidewalls and high load resistance. Check for cuts, cracks, and embedded stones daily; clean up foreign objects in time. Maintain proper tire pressure; over-inflation increases puncture risk, and under-inflation causes excessive wear. Avoid driving on sharp rock fragments to prevent tire blowouts.
Lubrication enhancement of hinge points and pin shafts. Frequent impact accelerates wear of pin shafts and bushings. Use extreme pressure anti-wear lubricating grease and lubricate every shift. Check the clearance and abnormal noise of hinge points daily; replace worn pin shafts and bushings in time to avoid frame deformation and cracking.
Engine and hydraulic system load protection. Long-term heavy-load operation easily causes overheating and accelerated wear. Use high-grade engine oil and hydraulic oil with good anti-wear performance. Clean radiators and filters frequently to avoid overheating. Avoid long-term full-load continuous operation; allow proper rest intervals to reduce component fatigue.
Brake system safety maintenance. Frequent emergency braking under heavy load accelerates wear of brake pads and drums. Check the thickness of brake pads and braking effect daily; replace worn parts in time. Avoid long-term sliding and violent braking to ensure braking reliability and driving safety.
Daily cleaning and regular comprehensive maintenance. Clean dust and gravel on the whole machine, especially in the engine compartment and chassis, daily. Conduct a comprehensive structural inspection, wear measurement, and lubrication supplement every week. Conduct oil change, filter replacement, and torque inspection monthly to ensure the loader is in good condition.
Reasonable operation specifications reduce impact. Operate smoothly, avoid shoveling rocks with force, and do not turn during lifting. Use suitable gear and throttle to match the load, reducing impact and fatigue damage to the whole machine.
In summary, the maintenance of loaders in hard rock conditions focuses on wear-resistant reinforcement, impact reduction, enhanced lubrication, and real-time inspection. Strict implementation can effectively extend service life and reduce failures.
