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为了使货车的走行部分更坚固，防止烧瓦的发生，废止铅作业，有必要变更轴承的材料。通过研制和试验，把轴瓦体材料改为铁基轴瓦体，把白合金变为少铅的锡基合金，并且针对其粘着强度问题以及轴温的影响和使用的耐久性进行了现车走行试验。另外为了研讨锡基合金作为轴颈轴承使用时的管理基准，锡基合金和车轴轴颈面的关系，在JR货物新小岩车辆所的回转试验机上，进行了烧瓦试验。
In order to make the moving part of the truck more sturdy, to prevent the occurrence of the bush, the abolition of lead operations, it is necessary to change the bearing materials. Through the research and test, the material of the bearing bush was changed to the iron-based bearing bush body, and the white alloy was changed into the tin-less alloy of lead. Vehicle running test was carried out according to the influence of the adhesive strength, the influence of shaft temperature and the durability . In addition, in order to study the use of tin-based alloy bearings as a management benchmark, the base alloy and the axle shaft surface relationship, the JR cargo Shinkoiwa on the rotary testing machine, the burning test.