Though they share the same tin and ohv 134ci engine the 600 is a superior tractor. NAA/Jubilee is sort of a hybred between the 8N and the 600 and many parts are peculiar to the NAAs only. The 600 and later tractors have a piston pump where the naa has a vane pump and parts are scarce for those. 600 used a remote valve under the seat that was interchangeable with all the smaller fords from 1955 through 1982 at least. Remote valve for an naa was available but very hard to find today. Naa used the same rear axle as the 8N with the splined axle and outer hub. Prone to wear and outer axle seal failure causing oily brakes. 1955 600 and it's sisters through 1964 was improved. 55 and later had more transmission choices - 4 sp, 5 sp and 5 sp/w lpto. And 600/800 could be ordered with power steering where the Jube could not.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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