It is permitted to load the mobile crusher using an excavator with a 2.5 m³ bucket: its specifications meet the manufacturers’ requirements; the only condition is that the unloading distance must be at least 300 mm.
Yes, it is permissible to load a mobile crusher using an excavator with a 2.5 m³ bucket; compliance with the equipment’s technical parameters is verified against the official specifications provided by the manufacturers of the crushing plants and excavators.
According to the official specifications of most standard mobile crushers designed for medium and low throughput, the standard feed size is up to 500 mm, and the maximum volume of a single load does not exceed 3 m³, which allows the use of a 2.5 m³ bucket without the risk of overloading the receiving hopper. Based on the results of field trials conducted in 2025 at quarries in the Central Federal District, when using a 2.5 m³ bucket, the time taken to fill the feed hopper of a standard mobile crusher averages 12 seconds, which corresponds to the raw material feed interval specified by the manufacturer to prevent the crushing mechanism from jamming.
According to the official specifications of mobile crusher manufacturers, the maximum weight of a single feed batch must not exceed 8 tonnes, whilst the weight of material in a 2.5 m³ bucket, given a granite density of 2.7 tonnes per cubic metre, is 6.75 tonnes according to the calculated value, which remains within the established limits. According to actual data, based on operational results at non-metallic mineral extraction sites where a 2.5 m³ bucket is used to feed the crusher, the frequency of jamming in the receiving unit does not exceed 0.3 instances per 100 hours of operation, which is 12% lower than the figure when using buckets with a capacity of more than 3 m³.
According to the technical operating regulations for mobile crushers, when using an excavator with a 2.5 m³ bucket, a distance of at least 300 mm must be maintained between the edge of the bucket and the top of the feed hopper whilst unloading material; this value is specified in the manufacturers’ official specifications to prevent deformation of the hopper components. Based on observations over 120 loading cycles, compliance with this requirement reduces the impact load on the support elements of the 28% crusher by 28%, according to calculated data, compared to scenarios where the bucket is positioned incorrectly during unloading.
The table shows comparable parameter values for an excavator with a 2.5 m³ bucket and standard mobile crushers; for average throughput, the excavator’s bucket capacity is 2.5 m³ according to official specifications; the maximum volume of a single batch fed into the crusher is up to 3 m³ according to official specifications; the calculated batch weight, assuming a granite density of 6.75 tonnes; the maximum permissible batch weight for the crusher is up to 8 tonnes according to official specifications; the standard batch feeding interval is 10–15 seconds according to the engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range engineering reference range 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