An agricultural vehicle includes a chassis and a header carried by the chassis. The header includes: a header frame; a cutter movably coupled to the header frame; a reel arm pivotably coupled to the header frame; a reel carried by the reel arm and including a plurality of tines; a variable displacement fluid cylinder including an interior chamber, a first piston linked to the reel arm placed within the interior chamber and a second piston placed within the interior chamber, the interior chamber defining a shared volume between the first piston and the second piston; and a piston driver linked to the cutter and configured to translate movement of the cutter relative to the header frame into displacement of the second piston within the interior chamber. (Fig. 1) o->00,00e>4 C"") co C\|
