Patent ID: 7207581

Claim:
An agricultural windrower with a longitudinal axis extending between front and opposing rear ends, front and rear wheel pairs supporting a main frame, an operator's platform supported on said main frame generally adjacent said front end of the windrower, an engine and hydrostatic drive system supported by said main frame to supply motive power to said front wheel pair, said drive system including first and second hydrostatic pumps, one for driving each wheel of said front wheel pair, each said pump having a depending pintle arm selectively and continuously pivotable between forward, neutral and reverse positions, said pintle arms in generally the same vertical plane, said main frame adapted to support a removable crop-engaging header on said front end thereof, and an adjustable control system for said hydrostatic drive system comprising: a steering wheel supported on said operator's platform generally above said front wheel pair and rotatable in first and second opposing directions, said steering wheel having a neutral alignment wherein said steering wheel is generally in parallel alignment with said longitudinal axis; a first rotational motion transfer mechanism having first and second opposing ends, said first end of said first motion transfer mechanism connected to said steering wheel and said second end of said first motion transfer mechanism located generally behind said operator's platform, such that rotation of said steering wheel causes a generally equal amount of rotation of said second end of said first motion transfer mechanism; a second motion transfer mechanism connected to said pintle arms such that rotation of said second motion transfer mechanism in said first direction pivots said pintle arms apart, and rotation in said second direction rotates said pintle arms together; and a length adjustment assembly interconnecting said second end of said first motion transfer mechanism and said second motion transfer mechanism, said length adjustment assembly adapted to permit adjustment of the position of said first motion transfer mechanism relative to said second motion transfer mechanism whereby said pintles may be located in said neutral position when said steering wheel is in said neutral alignment.