Original MTD part 71902-194 — pinion gear (pinion set) designed for the gearbox of select walk‑behind mowers. Precision-machined metal pinion that replaces the worn or damaged gear inside the gear‑case assembly so the drive transmits smoothly to the wheels and cutting deck. Fits a range of Lawnflite machines — for example Danarm/Asuka models LM4850KXR, LM4851KXR and LM5360HXA / LM5360HXR (2005–2006), Cobra models M48SPK, M53SPH, RM48SPK and TN2160 variants, and Lawnflite‑Pro models such as 448KR / 448KJR / 448KJW and 553HRS / 553HWS series (years shown on parts lists). Cross‑references include 78003‑130 where applicable.

Simple to inspect and install: remove the gear‑case cover, swap the old pinion set for this original MTD part, and reassemble — matches the original gear geometry used in the listed gear‑case assemblies.