ROBEX Middle Arm Cylinder Seal Kit The modern mid arm cylinder seal repair kit includes the following components: 1. O-ring: used to seal the hydraulic oil inside the oil cylinder to prevent hydraulic oil leakage. 2. Sealing ring: used to seal the piston rod inside the oil cylinder to prevent hydraulic oil from leaking from the piston rod. 3. Guide ring: used to maintain the position of the piston rod and prevent it from deviating from the track. Other accessories The above components can be purchased separately or combined into a complete repair kit as needed. When replacing the seal, it is necessary to first drain the hydraulic oil from the cylinder, disassemble the original seal, clean the inside of the cylinder, and install a new seal. During the installation process, it is necessary to maintain cleanliness and strictly follow the installation instructions.