Ford 600 series

The three digit model number will start with a 6. Possible model numbers are: 620, 630, 640, 650, 660. The model number tells you which transmission it has and a few other items. Here's a brief synopsis:

620: bare bones model with no hydraulics and pto optional. 4 speed trans.
630: Step up from the 620. Has three point hitch, but no proofmeter. 4 speed trans.
640: Another step up. Probably the most common model of the 600 series. Has pto, three point hitch, proofmeter.
650: Same as a 640 except with a 5 speed trans.
660: Same as a 650 except for the addition of a dual clutch and live pto. All other 600 models have transmission pto.

I've done that job and while I wouldn't call it easy, it's definitely do-able. But you'll want a manual. You'll need a torch, a good drill and a good sharp chisel. There is also a bearing puller described in the manual that most people won't have, but I can help you construct one that works out of ordinary materials. Contact me for details after you've read about the procedure in the shop manual and are ready to proceed.

Jim