Maintenance performance policy of forest machines manufacturers is one of the effective tools for market development. The manufacturer is able to receive information about forest machines failures and their causes without delay due to corporate maintenance arrangement. This information will allow the manufacturer to develop and implement technological repair instructions. The durability of forest machinery operating at Karelian logging enterprises was assessed in the course of the research. The research was carried out for four years and included 16 forest machines. The main research objects included details of processing equipment, a hydraulic system, and an engine fuel system of John Deere 1010 and 1410. The durability analysis of John Deere forwarder elements justifies the necessity of organizing an effective system of spare parts supply. The authors propose the efficiency criteria of spare parts and consumables delivery as well as the technique to determine the optimal time interval of spare parts delivery and transportation options. The efficiency of spare parts distribution to storage facilities is estimated as a function of time loss and expenditure for spare parts delivery and failure recovery. The proposed mathematical model to determine the number of reserved spare parts in each stock makes allowance for the system temporal development. The paper outlines the structure of a technological instruction of parts restoration by welding and building up processes and the basic requirements for the work-site arrangement.

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The graph analytical method of comparative evaluation of the transport and technological machines aggregates feasibility, which can be used in the development and improvement of the design of machines and equipment, is presented and tested on the example of gearboxes of various designs. Market conditions of management require the construction of machinery and equipment corresponding to a high level of operational adaptability as well as the ability of specialists to compare and evaluate a design at the planning and production engineering stages. The article is devoted to the substantiation of assessment tools and evaluation methods and to the development of recommendations for improving the operational manufacturability and maintainability of various designs of machines units in order to reduce operating costs for their maintenance and repair. The authors have established that the design of a constant-mesh transmission is more advanced. The reduction in the replacement time of individual parts, in particular the secondary shaft of the gearbox is 16% compared to the replacement of the same shaft of the gearbox with mobile units. Due to the improvement of the technological process of disassembly and assembly by using a special mandrel, the duration, and hence the complexity of replacing the secondary shaft of the gearbox of the TLT-100 tractor is reduced by 27%.