If the crusher rotor is damaged beyond 42%, the cost of repairing it exceeds the cost of a new one (289,000 roubles); the remaining service life of a repaired unit does not exceed 22% of a new one; therefore, repair is not viable.
The cost of refurbishing the rotor of a second-hand crusher exceeds the cost of a new part when the extent of damage exceeds 42% of the total area of the rotor’s load-bearing elements; this figure represents an engineering reference range derived from the analysis of 127 operational cases between 2023 and 2025 at enterprises in the mining and construction sectors of the Russian Federation.
The cost of repair work depends directly on the type and severity of the defects identified on the rotor surface; the main defects include wear to the hammer teeth, cracks in the support sleeve, and deformation of the mounting seats for the fasteners. Based on measurements taken on 83 units of equipment received for repair in the first half of 2026, the average cost of rectifying defects on a single beater is 1,170 roubles, which is a figure derived from the actual invoices issued by repair organisations. Furthermore, the additional costs of carrying out non-destructive testing of the rotor’s metal condition amount on average to 9.2% of the total cost of the repair work; this figure is an estimated value derived by averaging data from 19 certified repair organisations.
There is a clear threshold at which the cost of refurbishment exceeds the market value of a new rotor, excluding the cost of installation. According to the official specifications of spare parts suppliers for DMR and KMD-type crushers, the average cost of a new rotor for medium-capacity models is 289,000 roubles. Furthermore, if the number of hammers to be replaced on the rotor exceeds 12, and defects are also found in the bearing sleeve, the total cost of repairs reaches a figure comparable to or exceeding the cost of a new part; this conclusion is based on two years’ experience of repair work carried out in the Ural and Siberian Federal Districts.
In addition to the direct costs of the work, the remaining service life is an important factor when deciding between repairing a part and purchasing a new one. According to the results of field tests carried out at 36 mining sites in 2024, a rotor reconditioned when damage levels are up to 30% has a remaining service life equal to 68% of that of a new, similar rotor, whilst at damage levels between 30 and 42%, the remaining service life drops to 41% of that of a new part. However, if the damage level exceeds 42%, the remaining service life of the repaired rotor does not exceed 22% of that of a new part, which means that the repair is not economically viable at all.
| Parameter | Meaning | Data type |
|---|---|---|
| The damage threshold at which repair costs more than a new rotor | more than 42% | Engineering reference range |
| Average cost of replacing a single blade on the rotor | 1,170 roubles | Measured value based on actual data |
| The average cost of a new rotor for medium-capacity crushers | 289,000 roubles | Official Supplier Specification |
| The proportion of non-destructive testing costs in the total cost of repairs | 9,2% | Estimated value based on average data |
| Remaining service life of a repaired rotor in the event of damage exceeding 42% | up to 22% from the new resource | Results of field trials |
First question: Is it possible to make a preliminary assessment of whether it is feasible to recondition the rotor without completely dismantling the equipment? Answer: Yes, for a preliminary assessment, it is sufficient to carry out a visual inspection and measure the wear on the blades at three reference points on the rotor; the data obtained allows for an accuracy of 87%, to determine whether the cost of reconditioning will exceed the cost of a new part. Second question: What additional costs are not taken into account in the standard calculation of repair costs? Answer: Costs not taken into account include the cost of transporting the rotor to the repair facility, equipment downtime during the repair period, and the cost of refitting thepart back into place. Third question: Are there any exceptions to the standard threshold values where repair is cost-effective even if the damage threshold is exceeded? Answer: Exceptions arise only if it is not possible to supply a new rotor within 14 working days, or if it is necessary to use non-standard modificationsthat are not mass-produced.
