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D155-1A推土机变速系统采用动力换档、行星变速器,其特点是可在不切断动力下进行换挡;其变速液压系统回路原理图,如图1所示。
D155-1A bulldozer variable speed transmission system uses power shift, planetary transmission, which is characterized by the power can be cut off without cutting off; its variable speed hydraulic system circuit diagram, shown in Figure 1.