With regard to PTO Shaft size - I've had this 640 for a very long time and it does have the smaller shaft which the over riding clutch adjusts to the new size. I think it came on the machine new. And yes, the fellow I bought this machine from thought it would work well on clearing fence lines and he felt it was too much work for the return - I do too but with our dry spells we get into a "Burn Ban" and the wood pile gets away from me especially when I prune the orchard. So I agree the cut the shaft makes the most sense and that leaves we with still looking for parts book and a source for parts appreciate it if you all might keep your eyes open for these little gems. As always thanks guys for a great response.
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Today's Featured Article - History of the Nuffield Tractor: Part 2 - by Anthony West. In February 1953 production of the ETC T.V.O engine started, ready for the March 1953 press announcements. The new TVO engine had a number of improvements which resulted in a 10 per cent more power (43bhp as against 38 bhp on the earlier engine) and 10 per cent more fuel economy. Some of the improvements are listed below: Redesigned combustion chamber, improved spark plugs and positioning, plug size 14mm(earlier size 18mm).
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