Maybe it was blocked off for some reason. I think I saw a 7-speed transmission in the parts diagrams online for Germany to comply with the speed limit laws. Maybe you had that "feature?"
On the other hand it could have been fiddled with before you bought it. we bought a former state road mowing non-ford with a similar 4 speed 2 range setup and the linkage for 3 and 4 had evidence of intentional tampering to disable those speeds. some external lube lines for the gear box were messed up too. Took a day to straighten that all out and 4th still didn't move due to non-use. I think the detent was rusted as there was no obvious mechanical issues and because suddenly with some frustrated shifter jamming at the end of the day I got it to go and it's never re-rusted in 5 years.
You may want to lift off the shift cover and see if there is anything strange in there or a missing bolt/pin?
Fast Shipping! Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.