| Also known as | T1712 |
| Diagram | Fig. 13 — GEARBOX OUTER COVER · ref 22 |
| Subsystem | gearbox |
| Listed in parts books | 1964–1972, 1974, 1976–1980 |
ACTUATOR SPRING T140
Gearbox actuator spring, part of the clutch lever mechanism on the outer cover, PN 57-1712.
This is the actuator spring listed in the gearbox covers and selectors sections of the parts books, carrying the number 57-1712 (also shown as T1712 in older references). It's part of the mechanism that works the clutch operating lever on the gearbox outer cover.
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The spring shows up across a long run of catalog years, so it's a common item on unit-construction Triumphs of this era, not something tied to one specific model or year. If you're rebuilding the outer cover assembly or chasing a clutch lever that doesn't return properly, this is a small part worth checking.
Given what a minor component this is in the overall gearbox, it's easy to overlook when doing a cover rebuild, but a tired or broken actuator spring can leave the clutch lever feeling loose or not returning the way it should.
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