What happens when the pile begins to move while filling a loader bucket?

When the pile begins to move while filling a loader bucket, it indicates that the material within the bucket is reaching its capacity. At this point, any further attempts to push more material into the bucket will not be effective because the material is shifting and may not be effectively displaced. The movement signifies that the bucket is full or cannot accommodate additional material without spilling over. This understanding of the loader's capacity is crucial for efficient operation and ensures safe handling of materials. Recognizing this condition helps in preventing overloading and potential equipment damage or safety hazards.