Heavy Equipment Parts supplies quality hydraulic cylinder seal kits to restore and maintain excavator boom, arm, and bucket cylinders. Each kit contains all the seals, O-rings, backup rings, and wear rings needed to complete a full cylinder rebuild. Our seal kits are precision-manufactured from polyurethane and NBR compounds, ensuring long service life and reliable performance under high hydraulic pressure and temperature cycles. We stock cylinder seal kits for Komatsu, Caterpillar, Hitachi, Hyundai, Kobelco, Volvo, Doosan, JCB, and many other OEM brands. Available from our Sydney warehouse with fast dispatch across Australia.