An agricultural machine comprising an input shaft connectable to the power take off shaft of a tractor； a flywheel connected to the input shaft； workings driven by the input shaft； an access panel open-able to provide access to the workings of the machine； an access panel handle having a first position for opening and a second position for closing the access panel； and an brake for arresting rotating of the flywheel with a brake handle with a first position for braking the flywheel and a second position for releasing the flywheel； the access panel handle and the brake handle are arranged with respect to each other such that the access panel handle can only be placed in its first opening position when the brake is in first braking position.
