I am not real familiar with a CIH 5120 but have been around them some. Before I would get too in depth in any thing I would change the transmission filters and make sure the oil level is topped off. These tractors are sensitive to plugged or restricted filters. IRC the power shift control valve is a manual one not electronic. If the filters are not your issue then I would say there is a control valve sticking in the valve body.
I am sure there are fellow that will have more recent knowledge of this tractor. It has been 10 years or more since I worked on one. They really did not seem to have many issue around here. There are a few on some livestock farms with pretty high hours, 10-12K range.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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