| Also known as | T4395 |
| Diagram | Fig. 10 — GEARS — SHAFTS — SELECTORS — STARTING MECHANISM · ref 52 |
| Subsystem | gearbox |
| Listed in parts books | 1971–1973 |
Lock washer
A gearbox lock washer for the shaft and gear assembly, used on the five-speed gearbox setup.
This is a lock washer used inside the gearbox on the shaft and gear assembly. It shows up in the parts books alongside the gearbox shafts and gears, including the five-speed gearbox setup used on the T150V and the parts list for the optional 5-speed conversion. Its job is straightforward: it keeps a nut or retaining part from working loose under the vibration and load a gearbox sees in service.
Read more
The older book form of this part number is T4395, so if you're working from an early parts list that's the number you'll see instead of 57-4395. Triumph later replaced this part number with 57-4909, so if your bike or your parts diagram references that number, it's the same lock washer under a newer designation.
Across the catalog this one turns up across a handful of gearbox internals entries spanning the early '70s. If you're not sure which gearbox variant you've got, it's worth double-checking the shaft and gear layout against your parts book before ordering, since this washer is tied to specific spots in the gear stack.
Sorry if we got something wrong here. If you think this information isn't correct, .