Back-Up RingHydraulic sealing component used in lift cylinder, tilt cylinder, or steer cylinder assemblies to contain fluid pressure and exclude external contamination at the rod, piston, and gland interfaces. Supplied as an aftermarket replacement under part number AC1902-65139. Material chemistry, durometer, and profile geometry match original specifications so groove fit, sealing pressure, friction behavior, and chemical compatibility match factory cylinder performance under cycle load. Typically replaced as part of a complete cylinder reseal kit to avoid mixed-age components and repeat teardowns. Verify the OE seal part number and cylinder bore or rod dimensions on your existing component before ordering to ensure correct fitment.Aftermarket replacement part, cross-references original part number AC1902-65139.Need help confirming fit? Call (562) 693-7748 with your serial number.Part number variants: AC1902-65139, ac1902-65139, AC190265139, ac190265139 ⚠ Warning: Some equipment has serial-number breaks that may not be reflected in the catalog. Contact us for clarification before ordering if uncertain.SCR Forklift Parts ships from Whittier, CA with next-day delivery available across the US when needed.
