This kit supplies replacement gears specifically for JR Propo servos carrying the 4000, 4135 or 4735 model codes. Fitting the kit restores precise tooth engagement and helps bring back original response without changing electronics or the case.
Only the listed model codes are supported, so verify the servo label before ordering. When refitting gears, note each gear's position and direction, and check related parts such as bearings and shafts for wear to ensure correct reassembly.
Use the set for scheduled maintenance or when adjusting servo behaviour for model setups, focusing on correct mesh, smooth rotation and freedom from binding for longer service life.
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