Part Name & Function
The part number 0717736M02 in the TAFE spare parts catalog is described as "NUT DRIVING PINION LOCK (i.e. a lock nut for the driving / differential pinion) in a PDF of parts pricing. Actually, in the parts PDF it is clearly listed as: "NUT - DRIVING PINION LOCK under HSN code 73181600.
A driving pinion lock nut is used in a tractors final drive / differential assembly. Its purpose is to clamp and lock the pinion gear (or pinion shaft) securely on its bearing or journal, preventing axial movement or loosening under load. This nut ensures the proper preload on bearings and maintains alignment under heavy torque.
Physical / Specification Notes
While the catalog listing does not give full dimensional specs (thread size, pitch, width, material grade), as a genuine TAFE part it is likely made to OEM quality tolerances, hardened or high-grade steel, and with locking or self-locking features (e.g. a nylon insert or helicoil). It works as a torque-critical fastener in close tolerance assemblies where backlash and bearing life are sensitive to axial play






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