| Also known as | T2240 |
| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 30 |
| Subsystem | gearbox |
| Listed in parts books | 1968, 1970–1974, 1976–1980 |
MAIN SHAFT LOCK WASHER T/S - Replaces 57-0732, 02-0240
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57-2240 is a lock washer for the gearbox mainshaft, catalogued for the unit-construction gearbox including the 5-speed cluster. In the parts books it's listed as MAIN SHAFT LOCK WASHER T/S, and it replaces the earlier 57-0732 and 02-0240 numbers, so if your book still shows one of those older references it's the same part under this current number. You'll also see it under the older T2240 stamp.
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A lock washer like this sits under a retaining nut and keeps that nut from working loose once torqued down, which on a mainshaft matters because vibration and repeated engagement loads want to back fasteners off over time. It shows up in the GEARBOX SHAFTS AND GEARS figures across catalog entries running from 1969 into 1980.
It's a small, inexpensive item, but it's the kind of part worth having on hand when you're into the gearbox for other work, since a tab washer that's been bent over once shouldn't be reused. Give us a call if you want to confirm which gearbox variant your bike takes before ordering.
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