Cotton harvester frame structure includes main structural members elevated
to approximately cab floor level and extending horizontally rearwardly in
a planar fashion over the engine compartment and the rear axle. The
structural members attach to the central portion of the rear axle to
provide added clearance for larger wheels and tires. The single elevated
plane of the main frame structure provides simplified attachment of a
power module including a transversely mounted engine. Access areas under
the main structural members are of sufficient minimum width and height to
allow an operator or an assembler to stand fairly erect while accessing
most areas of the power module and a harvester fan.