K9004899 Boom Cylinder Repair Seal Kits For DX235LC-5 DX255LC Excavator Service Kit

Seals

Main article: Hydraulic seal

The seals are considered/designed to withstand maximum cylinder working pressure, cylinder speed, operating temperature, working medium, and appliEion. Piston seals are dynamic seals, and they can be single-acting or double-acting.[8] Generally speaking, Elastomer seals made from nitrile rubber, Polyurethane, or other materials are best in lower temperature environments, while seals made of Fluorocarbon are better for higher temperatures. Metallic seals are also available and commonly used cast iron for the seal material. Rod seals are dynamic seals and generally are single-acting. The compounds of rod seals are nitrile rubber, Polyurethane, or Fluorocarbon . Wipers/scrapers are used to eliminate contaminants such as moisture, dirt, and dust, which can cause extensive damage to cylinder walls, rods, seals, and other components. The common compound for wipers is polyurethane. Metallic scrapers are used for sub-zero temperature appliEions and appliEions where foreign materials can deposit on the rod. The bearing elements/wear bands are used to eliminate metal to metal contact. The wear bands are designed to withstand maximum side loads. The primary compounds used for wear bands are filled PTFE, woven fabric reinforced polyester resin, and bronze