| Also known as | T1922 |
| Diagram | Fig. 7 — GEARBOX SHAFTS, BEARINGS AND INNER COVER · ref 13 |
| Subsystem | gearbox |
| Listed in parts books | 1964–1969 |
Mainshaft 2nd gear (21T)
Mainshaft 2nd gear (21T) for the gearbox cluster, cataloged 1964-1969, now superseded by 57-3994.
57-1922 is a mainshaft 2nd gear with 21 teeth, part of the gear cluster riding on the gearbox mainshaft. It shows up in the parts book under the GEARBOX SHAFTS, BEARINGS AND INNER COVER figure, which is the section covering the mainshaft assembly and the parts that support it inside the gearbox shell. In the older catalogs this one was stamped T1922, the pre-1973 style number before the shop switched over to the current numbering.
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This gear was carried across catalog listings from 1964 through 1969, and it's since been superseded by 57-3994, which is the number you'll want if you're ordering new stock today. If your parts book or an old invoice shows T1922, 57-1922, or 57-3994, you're looking at the same physical piece across three different labels.
When you're pulling a gearbox apart for inspection, check the dogs and the bore for wear same as you would any mainshaft gear - a tired 2nd gear is a common contributor to gearbox jump-out. Confirm which gearbox your machine actually has before ordering, since the catalog doesn't spell out specific model fitment here beyond the year span noted.
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