Adjustable cotton picking unit pressure door

A cotton picker comprising:

• a chassis supported by a plurality of ground engaging members;
• a power module configured to power at least one of the plurality of ground engaging members;
• a plurality of picking units, wherein each picking unit of the plurality of picking units includes:
• a rotating picking drum having a first plurality of rotating picker spindles;
• a hinge;
• a pressure plate mounted on the hinge and configured to pivot with respect to the rotating picking drum;
• a plurality of torsion springs configured to apply a biasing force on the pressure plate, wherein each spring of the plurality of torsion springs includes a first end connected to the hinge and a second end in contact with the pressure plate;
• and
• an actuator configured to vary the biasing force applied by the plurality of torsion springs by rotating the hinge;
• a round module builder that includes an accumulator;
• and
• an air duct system coupleable to the plurality of picking units and the accumulator.