John Deere 770 help!

[beenthere]

:welcome: to TBN

Are you looking for used, so not interested in trying to buy new from Deere?

Not exactly sure what you mean by "4x4 gears" and it may be confusing to others just exactly what is happening, or has happened. What more can you tell us?

 

[RoyJackson]

The 770 had a 24 gross HP engine, 20 at the PTO. IF there is a 30 HP engine in there, it's probably out of a first generation 790, which had 30 advertised HP. My opinion is the seller embellished the HP rating. Putting it bluntly, he bullsh*tted you.

I suspect the 4x4 gears Mark Blackburn is asking about is the front axle spur gears. Those gears do well going forward, but backing with a load has resulted in breakage. The 770 and 790 used the same axle (for the 790's first generation, at least)...best place to look is a tractor salvage yard. Wenger's (Wengers Of Myerstown - Farm Equipment, Agriculture Equipment, Tractor Parts, Construction Equipment, Construction Parts) would be one place I'd call...

 

[Industrial Toys]

I can't imagine that there is a diesel engine on the planet that is an upgrade to a Yanmar! Unless maybe the upgrade was to furnish more horses.

That whole tractor is a Yanmar and when I met the JD territory manager or something like that, around the mid ninties, he said they simply reffered to that tractor as the Yanmar