Profile: Sem Spares, LLC provides replacement parts for earthmoving, mining, & construction equipment. We also offer replacement seal kits for hydraulic cylinders. Our bush pin is heat treated thoroughly for internal strength to bear heavy pressure resistance in odd conditions, which provides minimum wear & tear from soil particles and sprocket. The ends are tempered to bear the pressure of the track press during fitment & load of the machine. Our swing device/travel device sets consist of planetary gears, pins, pin springs, needle roller bearings, thrust plates, carriers, ring gears, propeller shafts, nuts, covers, hubs, lock plates, plugs, stoppers, pins and housings.