The intrepid Shade Tree Mechanics have put together a list of all the Woodruff Keys used in the Cub Tractor. The TC-37A Parts Catalog has cross references to the Woodruff Key numbers. But the later Parts Catalogs only refer to the key by the part number and dimensions. But all is not lost. MSC (a supplier to machine shops and other industrial concerns), has a table in their Big Book that has a list of all the Woodruff Keys, their dimensions and a USA Std. No. We think that the USA Std. No. allows manufacturers other than Woodruff to also make Keys. In any event, the list of the Woodruff Keys used in the Cub are shown below in a gif, taken from the spreadsheet. The list is also in text format below the gif.
On the off chance that you lose a key or need an extra, you now know what to ask for.
IH PART No. DESCRIPTION Woodruff No. USA Std. No. Width Length
103904 Governor Rockshaft Extension Shaft Key 2 304 3/32 1/2
106749 Rotor Shaft Key 3 404 1/8 1/2
106749 Touch Control Key 3 404 1/8 1/2
106750 Crankshaft Pinion Key 6 505 5/32 5/8
106750 Fan Drive Pulley Key 6 505 5/32 5/8
112139 Steering Wheel Key A 807 1/4 7/8
124549 Belt Pulley Drive Pinion Key 9 606 3/16 3/4
124552 Brake Drum Key 13 608 3/16 1
124555 Steering Gear Arm Key 16 609 3/16 1 1/2
218211 Steering Knuckle Key 91 806 1/4 3/4
7699TM Generator Pulley Hub Key 5 405 1/8 5/8
