John Deere 643 Corn Head Manual Try Parts Manual Account OQ-626. John Deere 643 Corn Head Manual Select Repair Manual 123 pg. - G67248.JD 344, 443, 444, 643, 644, 843 OPERATORS MANUAL. Fully covers all years & all serials JD Models: 344, 443, 444, 643, 644, 843 Quik-Tatch Corn Heads. OPERATORS MANUAL FOR JD 40 Series Corn Heads Model Numbers: 243 244 343 344 443 444 546 643 644 645 843 844 Combines specified in manual: Forage John Deere 643 CORN HEAD Parts Catalog Manual. Page 1. A2 40 SERIES CORN HEADS. H32295. -UN-01JAN94. JOHN DEERE 643 CORN HEAD. These kits are designed to fit John Deere. 643 & 693 (30”) corn headers. This manual covers several Stalk Stryker™ configurations available for the above John Deere 643 CORN HEAD Parts Catalog Manual - PDF DOWNLOAD. Page 1. A2 40 SERIES CORN HEADS. H32295. -UN-01JAN94. JOHN DEERE 643 CORN HEAD.