ALL WHEEL DRIVE, WALK BEHIND MOWER

A lawn mower (10) comprises a blade housing (20); an engine (30) supported at least in part by the blade housing (20) and configured to rotate a drive shaft (130), wherein the drive shaft (130) comprises a drive shaft pulley; a mobility assembly operably coupled to the engine and configured to provide mobility of the lawn mower (10) responsive at least in part to operation of the engine (30), wherein the mobility assembly comprises a first set of wheels (40.42) and a second set of wheels (40,42); a drive system comprising: a first transmission operably coupled to the first set of wheels; a second transmission operably coupled to the second set of wheels; a single flexible driving member; and an idler pulley; and a remote actuator (70) operably coupled to the drive system, wherein the idler pulley moves from a first position to a second position responsive to operation of the remote actuator (70), wherein, when the idler pulley is in the first position, the lawn mower (10) is in a no wheel drive mode such that the flexible driving member is slack and power is not transmitted from the drive shaft to the first and second transmissions, wherein, when the idler pulley is moved to the second position, the lawn mower (10) is switched to an all wheel drive mode such that the idler pulley tightens the flexible driving member to engage the drive shaft pulley, the first transmission, and the second transmission to permit power transmission from the drive shaft (130) to each of the first and second sets of wheels, and wherein, in the all wheel drive mode, the drive shaft pulley engages a first surface of the flexible driving member, and the idler pulley engages a second surface of the flexible driving member, wherein the second surface of the flexible driving member is opposite to the first surface of the flexible driving member.