The SCV's (hyd. valves) are totally different. On the early model, they were mounted under the hood. On the late model, they are mounted on the rear of the rockshaft housing and are fed though passages in the rockshaft housing. Would easily cost several thousand to convert. The late SCV's are very easy to remove and rebuild, and Deere continued to use that same basic SCV until the last 60 series tractor was built in the early 1990's. The early valve on the otherhand, I've seen very experienced Deere techs fight those things all day.
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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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