John Deere T77814 O-Ring

The John Deere T77814 is a high-performance O-ring engineered for static and dynamic sealing applications in hydraulic, pneumatic, and mechanical systems. Manufactured to OEM specifications, it features a 7.65 mm (0.301 in) inner diameter and a 1.78 mm (0.070 in) nominal cross-section, resulting in an outer diameter of approximately 11.21 mm (0.441 in). Constructed from 90 durometer Shore A nitrile rubber (Buna-N / H4D compound), this seal provides resistance to petroleum-based hydraulic oils, fuels, water, and abrasion across a standard operating temperature range of -40°C to 120°C (-40°F to 248°F). It serves as a direct replacement for John Deere part numbers T77814 and A-T77814, ensuring precise fit and reliable sealing performance in demanding agricultural and industrial environments.