apart by various components including the rollers 32 34 36 38 42 44 46 and 48 and a tongue 66 the spacing between the side panels defines the width of the bale forming chamber and the length of the cylindrical bale 12 that that will be formed by the baler the belts 20 are kept under tension by a belt tightener 82 so that the belts 20 define a variable sized bale chamber another type of round baler known as a fixed chamber baler does not include the variable size bale chamber feature and typically includes rolling elements that are in fixed positions to define a bale chamber of a fixed diameter the present invention is useful for either fixed or variable chamber balers at least one of the fixed position rollers 32 34 36 38 42 44 46 and 48 of the baler 16 is powered by a drive system that includes a right angle gearbox 62 connected at its input shaft to a driveline 64 the gearbox 62 transfers power from a towing vehicle 10 through an output shaft to chains and sprockets that transfer power to the driven roller s and to the pickup 80 which functions to lift crop material 14 from the ground and into engagement with a roller 72 belts 20 and a starter roller 55 which cooperate to.