Abstract: An agricultural fertilizer spreader having a hopper carrying a conveyor operable to move material from the hopper onto rotatable fertilizer distributing discs. A ground wheel, through a gear drive power transmission system, is operable to concurrently operate the conveyor and fertilizer distributing discs. An adjustable support is used to release a driven gear from a drive gear or hold the driven gear in driving relation with the drive gear.

Abstract: A dump box assembly of the type used for the handling of bulk material and mountable on a truck or trailer bed adapted to transfer solid bulk material from a dump box to a remote receiver. A dump box is pivotally assembled to a fixed upright support structure through a link assembly for elevated rotation from a relatively lower transport position to a relatively elevated, laterally displaced dumping orientation. Means are provided for the elevated rotation of the dump box about an axis parallel to and in proximity to an upper dumping edge of the dump box. The link assembly operates to further elevate and laterally displace the dumping axis of the dump box preparatory to the dumping sequence. A support rail is movable with the link assembly to a position to lend support to a discharge chute associated with the interior of the dump box assembly to guide the discharge of bulk material from the dump box.