AT340155 is a single-acting pneumatic cylinder, essentially an integrated air spring support component designed specifically for cab doors. It is tailored for John Deere models 310G, 310P, 310J, 310K, 310K EP, 310L, 310L EP, 310SG, 310SJ, 310SK, 310SL, 310SL HL, 310TJ, 310TK TMC, 315 P, 315J, 315SG, 315SK, 315SL, 320 P, 325J, 325SK, 325SL, 410 P, 410G, 410J, 410K, 410L, 410TK TMC, 710 P, 710G, 710J, 710K, 710L series backhoe loaders. As an OEM-equivalent replacement part, its core function is to provide stable auxiliary support, cushioning damping, and angle locking for the cab side door. It generates support force through high-pressure nitrogen within a sealed air chamber, addressing issues common with traditional mechanical supports such as sticking and manual opening/closing effort. Even in muddy, bumpy, dusty construction and agricultural environments, ensuring smooth door operation and reliable positioning. This critical component significantly enhances equipment safety and operational convenience.