... shaft,excellent resistant performance of dry grinding.4.Dustproof oil seal can be used for excavator brands such as ... HITACHI, KOBELCOCATERPILLAR, Volvo, KOMATSU, HITACHI, KOBELCO, KATO, SUMITOMO. 5.Oil seal provides the basic three functions: sealing, dustproof and fixing ... .6. Assembing easily no need any tools,No corrosion because of the single polymeric material Various Dustproof ...