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Sounds like the 730D that my dad had. If you unbolt the gear shift pattern plate (or what every you call the thing), you can lift the whole front console up enough (about 4 to 6 inches) to get the shift lever back to the other side. We lifted with a high lift jack. During normal operations, when you run the shift lever over to the right (or back to the left) you are essentially shifting the high/low range part of the transmission. What happened to you is that when you shifted it in to high range, the shifter didn't "latch" and slipped back into low range...usually happens when the tractor is coasting and has back pressure from the rearend. To avoid having this happen again, you will want to make sure you force the shift lever as far to the right as possible (don't shift sloppy if you can help it). The fix for this (proper one that is) is to tear down the tractor and put some shims in the transmission to get stuff moved more to the right. Not sure exactly which shafts you need to shim. An old John Deere mechanic told my dad this years ago...we never did fix it. Just learned "how" to shift the tractor. The shifter was slightly bent one way, so we use to always twist the shifter so that the outside of the bend was on right side. Hope this helps. I know this can be a real pain...after the second time I didn't shift the tractor "right" my dad said I was going to be fixing the thing by myself (it never happened a third time). Hope this information helps.
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