OK, I bought a JD 4630 with Quad Range about 4 years ago, and two of the gear ranges did not work. The man that I bought it from said that the JD dealer said its linkage may just needs to be adjusted. I have used this tractor to pull a disk and plow with the two gear ranges that do work. I was planning to look into this problem when I retired from working long hours. This year I got in a car accident, have not used it all year and do not remember which two ranges do not work. I am no longer working so now would be a good time to try to fix this problem and maybe get some soybeans planted in 2014. My small farm is about a hour away so it may be several weeks before I can get to work on it. Does anyone out there know how to set the shifting linkage to check to see if that is the problem or if it is in the tranmission I will continue to use it as is. I may need to look into buying a service manual on this tractor. Thanks and have a good Christmas.
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