One false step will make a great difference. A little component is very important for machine. A floating seal is used for the rotating components as shown in the area framed by a dash line in Fig. 2which are mounted on crawler-type construction machines such as bulldozers and hydraulic excavators for the purpose to prevent the internal oil leaking as well as foreign materials invading, such as silt and sand. This is composed of the cast-iron seal rings and rubber O-rings and utilizes the pair of identically-shaped seal rings facing each other during use as shown in Fig. 1.
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