Abstract: A belt tensioning device is provided for a pulley drive mechanism including a motor with a drive shaft, a drive pulley mounted on a drive shaft, an idler pulley rotatably mounted in a pulley support, and a drive belt trained around the pulleys. The belt tensioning device includes a scissor jack connected between the motor and the idler pulley support. The jack is extendible so as to increase the spacing between the pulleys and thereby increase the belt tension, and retractable so as to decrease the spacing between the pulleys and thereby decrease the belt tension. The extension and retraction of the scissor arms of the jack is controlled by a draw bolt, or alternatively, by a spring which automatically provides tension on the belt. In the method of adjusting the belt tension, the jack is installed between the drive pulley and the idler pulley, and the jack is then actuated so as to adjust the spacing between the pulleys and thereby adjust the tension of the drive belt.

Abstract: A shield is provided for housing a single sprayer head of an agricultural sprayer assembly. The shield is pivotally and adjustably mounted upon a vertically oriented post connected to the agricultural frame. The shield is conically or pyramidly shaped, having an ever-increasing cross sectional area from top to bottom. The sprayer head is oriented within the shield such that the spray band coordinates with the major axis of the shield. A removable door is provided on the shield to provide quick and easy access to the sprayer head for cleaning and maintenance purposes.