handwheel

1. (mechanics) Any wheel worked by hand, whether used to allow leverage, as of a valve or a handbrake, or to allow fine adjustment, as of a set screw.Examples: "Front damper doors on each hopper and the back damper door of the centre hopper are opened and closed by screw gear worked from a handwheel on the fireman's side of the cab."; "When the large handwheel seen in the illustration of a 68000 class cab is moved from "stop" to "run", the traction circuit contactors are closed and the locomotive moves off with the diesel engine running at idling speed."