A pickup unit of an agricultural baler, comprising: a reel with a plurality of tines configured for lifting a crop material from a field, wherein the reel is rotatable in an operating direction and a reverse direction; and a drive system configured for driving the reel, comprising: a gearbox configured for engaging with and receiving motive power from a power take off shaft of a towing vehicle for the agricultural baler, the PTO shaft having a predefined idle speed; the drive system further comprising a drive shaft operably connected to the gearbox and the reel; and a first clutch connected to the drive shaft; characterised in that the first clutch is configured for operably disconnecting motive power to the reel so that the reel is manually rotatable as the PTO shaft remains operably engaged with the gearbox, wherein: - the first clutch is configured so that its re-engagement speed is below the idle speed of the PTO shaft, - the drive system further comprises a second clutch in the form of an overrunning clutch that is operably connected in between the reel and the drive shaft, - the overrunning clutch is configured for allowing motive power to flow in only one direction such that the reel is manually rotatable in the operating and reverse directions without re-engaging the first clutch. a reel with a plurality of tines configured for lifting a crop material from a field, wherein the reel is rotatable in an operating direction and a reverse direction; and a drive system configured for driving the reel, comprising: a gearbox configured for engaging with and receiving motive power from a power take off shaft of a towing vehicle for the agricultural baler, the PTO shaft having a predefined idle speed; the drive system further comprising a drive shaft operably connected to the gearbox and the reel; and a first clutch connected to the drive shaft; characterised in that the first clutch is configured for operably disconnecting motive power to the reel so that the reel is manually rotatable as the PTO shaft remains operably engaged with the gearbox, wherein: - the first clutch is configured so that its re-engagement speed is below the idle speed of the PTO shaft, - the drive system further comprises a second clutch in the form of an overrunning clutch that is operably connected in between the reel and the drive shaft, - the overrunning clutch is configured for allowing motive power to flow in only one direction such that the reel is manually rotatable in the operating and reverse directions without re-engaging the first clutch. a drive shaft operably connected to the gearbox and the reel; and a first clutch connected to the drive shaft; characterised in that the first clutch is configured for operably disconnecting motive power to the reel so that the reel is manually rotatable as the PTO shaft remains operably engaged with the gearbox, wherein: - the first clutch is configured so that its re-engagement speed is below the idle speed of the PTO shaft, - the drive system further comprises a second clutch in the form of an overrunning clutch that is operably connected in between the reel and the drive shaft, - the overrunning clutch is configured for allowing motive power to flow in only one direction such that the reel is manually rotatable in the operating and reverse directions without re-engaging the first clutch. - the first clutch is configured so that its re-engagement speed is below the idle speed of the PTO shaft, - the drive system further comprises a second clutch in the form of an overrunning clutch that is operably connected in between the reel and the drive shaft, - the overrunning clutch is configured for allowing motive power to flow in only one direction