Adjustable track-width systems for agricultural machines

An adjustable track-width system for an agricultural machine, the adjustable track-width system comprising:

• a fixed axle member having a first section and a second section, the first section defined by a first corner and a second corner;
• an adjustable axle member having a third section and a fourth section, the adjustable axle member receivable by the fixed axle member and movable between a first position and a second position within the fixed axle member;
• a first fixed shim at the first corner defining the first section of the fixed axle member;
• a second fixed shim at the second corner defining the first section of the fixed axle member;
• and
• an adjustable shim, at least a portion of the adjustable shim between the second section of the fixed axle member and the fourth section of the adjustable axle member, the adjustable shim movable between a lock position where the adjustable axle member is held in position relative to the fixed axle member and an adaptable position where the adjustable axle member is movable between the first position and the second position.