The submitted paper deals with an analysis of machinery tools for forest cultivation and the way of wear of their functional parts. It analyses the state of tools of crusher of undesirable advance growth, which are exposed mainly to abrasive and fatigue wear in operation. On damaged tools – teeth, the effect of wear and mechanical and structural properties of teeth materials of different construction realisation were evaluated. Based on the material analysis results, the proposals for increase of resistance of the functional surfaces to abrasive wear in order to extend their lifespan are processed in the paper. Using visualization of the tool, the functional parts are determined, where hard layers should be applied to extend tool lifespan. At the end, the suggestions of experimental solution of the described problem are presented.