... 4.for excavator parts Various Dustproof Oil Seal for Excavator: 1.Various sizes of Oil Seal can be used at BOOM, ARM ... shaft,excellent resistant performance of dry grinding.4.Dustproof oil seal can be used for excavator brands such as CATERPILLAR ... HITACHI, KOBELCOCATERPILLAR, Volvo, KOMATSU, HITACHI, KOBELCO, KATO, SUMITOMO. 5.Oil seal provides the basic three functions: sealing, dustproof and fixing.6 ...