1.决定大修的原则 由于不同摊铺机的使用工况和对其进行维护保养水平的差别很大,因此,仅凭使用年限和工作时间很难确定其合理的大修时机。从我们多年从事摊铺机大修的实践中得知,一般在工作4 000~6 000 h后就需要大修。摊铺机在必须进行大修前的主要症状如下 1. The principle of determining overhaul Because of the difference between the operating conditions of different pavers and their level of maintenance, it is difficult to determine the reasonable timing of overhauling based on their useful life and working hours. It has been learned from our practice of overhauling pavers for many years that overhauls are usually required after 4,000 to 6,000 hours of operation. The main symptoms of pavers before overhauling them are as follows