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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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