When the bucket teeth of an excavator are worn, they will reduce operating efficiency from three core dimensions: digging resistance, material grabbing capacity, and operation cycle time. Meanwhile, they will also indirectly increase equipment wear and fuel consumption. The specific impacts are as follows:

Sharply Increased Digging Resistance and Higher Engine LoadThe core function of bucket teeth is to penetrate materials and reduce the cutting resistance of the bucket. Unworn bucket teeth are sharp and can easily pierce into soil, sand, gravel or rock crevices. Worn bucket teeth become blunt and lose their penetration ability. When the bucket cuts into materials, it requires greater thrust and digging force, forcing the engine to maintain high-speed operation. This not only reduces operating efficiency but also increases fuel consumption by 15%–30%. Especially when excavating hard soil, weathered rock or gravel mixtures, the resistance increase caused by worn bucket teeth is more significant. In extreme cases, the bucket may even "slip" and fail to penetrate the ground effectively.

Reduced Material Grabbing Volume and Lower Effective Payload per OperationThe spacing and shape of bucket teeth are designed to match the curvature of the bucket, forming a stable space for holding materials. Severely worn bucket teeth will damage this structure, causing materials to easily slide off through the gaps between teeth during excavation. As a result, the actual loading capacity of the bucket decreases by 20%–40%. For example, a bucket that can hold 0.8 cubic meters of material with standard bucket teeth may only hold 0.5–0.6 cubic meters when the teeth are worn. This requires more excavation-slewing-unloading cycles to complete the scheduled workload, directly prolonging the operation time.

Prolonged Operation Cycle Time and Slower Overall Construction ProgressDue to increased digging resistance and reduced loading capacity per operation, more work cycles are needed to complete the excavation and transportation of the same batch of materials. At the same time, blunt bucket teeth will reduce the scraping and stripping capacity of the bucket. When clearing the work surface, operators need to repeatedly adjust the bucket angle, further increasing the time spent on ineffective operations. For projects with tight schedules, bucket tooth wear will directly lead to construction delays. The impact is particularly significant in scenarios that rely on efficient cyclic operations, such as mining and large-scale earthmoving projects.

Indirectly Aggravating Wear of the Bucket and Other Equipment ComponentsAfter bucket teeth are worn, the bucket lip comes into direct contact with materials. The wear resistance of the bucket lip is much lower than that of bucket teeth. Long-term operation will cause deformation, wear and even cracking of the bucket lip, increasing the maintenance cost and replacement frequency of the bucket. In addition, the increased digging resistance will be transmitted to components such as the excavator’s boom, arm and hydraulic cylinders, aggravating the pressure load on the hydraulic system and the fatigue wear of the mechanical structure, thus raising the probability of equipment failure.

More Pronounced Efficiency Degradation in Special Operating ScenariosIn high-intensity scenarios such as breaking operations and frozen soil excavation, bucket teeth need to withstand impact loads and shear forces. Worn bucket teeth cannot effectively disperse stress, which not only leads to a sharp drop in digging efficiency but may also cause bucket teeth to break or fall off, triggering potential safety hazards. In scenarios such as dredging and bulk material loading/unloading, the anti-slip and grabbing capacity of worn bucket teeth decreases, resulting in more severe material slippage.