Part 51405MA Worm Gear Replacement for Briggs Stratton Engines Key benefits Restores proper gear engagement and reliable operation when the original worm gear is worn or damaged. Direct replacement sized to original specifications for a precise fit during . Simple swap reduces downtime and gets equipment back into service quickly. Features and important attributes Function: Worm gear designed to transfer rotational motion between mating gears in compatible engine or equipment assemblies. Compatibility: Replacement for Briggs Stratton applications that use part number 51405MA. Use with equipment that specifies this replacement part. Size: Measures approximately 2.00 x 0.75 x 2.00 inches for accurate fit and alignment. Performance: Returns correct gear mesh and motion control when installed as a like for like replacement. Why customers need this part Replaces worn or stripped worm gear teeth that cause slipping, noisy operation, or loss of function. Helps avoid more extensive repairs by replacing only the damaged component when compatible. Maintains equipment performance and extends service life when installed correctly. Practical use scenarios a worn worm gear during routine maintenance on a walk behind mower or small engine powered equipment that uses the specified part. Fix noisy or slipping gear engagement in garden equipment after detecting gear tooth wear. Keep a spare on hand for field repairs during seasonal service or before heavy use periods to minimize downtime. Installation notes Intended as a direct replacement sized to match the original part. Verify compatibility with your equipment using the part number before installation. Inspect mating gear surfaces and shafts for wear before installing the replacement to ensure long term performance. This replacement worm gear is supplied to match the original dimensions and function of part 51405MA for compatible Briggs Stratton equipment.