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#1
05-16-2012, 09:27 AM
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Cub Cadet 127 transmission failure
My Cub Cadet 127 hydrostatic transmission went completely out.
Last fall I bought a Cub Cadet 127 from the original owner (I think it was built around 1971). The original owner took good care of the tractor. This is my first tractor. The other day while mowing the grass, as I quickly shifted from forward to reverse and back to forward again, the transmission suddenly stopped working. There was no unusual noise. The transmission will not operate in forward or reverse … no movement whatsoever. I confirmed that all the linkages are working from the shift lever on the console back to the trunnion on the transmission, that the transmission is full of oil, that the two release valves on top of the transmission are not stuck, that the oil in the transmission is the correct color with no burnt smell, and that after jacking the rear wheels off the ground the transmission still will not work. I did notice that oil soaked grass was accumulated all around the top of the transmission and the cooling fins but noticed no signs of excessive heat. The only symptoms I noticed before the failure was that the tractor would speed up slightly when I went down a slight grade and/or after I completed a tight radius turn. The tractor pulled good when I drove up that same slight grade. I did confirm that the drive shaft from the engine was rotating the coupler at the input side of the transmission but the output side of the shaft was not spinning (the output shaft is located at the top rear of the transmission and protrudes about an inch out of the finned casing). I was able to turn that protruding output shaft by hand (I felt nothing unusual and it turned smoothly). I have not yet tried replacing the transmission filter. Any ideas of what to do next besides splitting the tractor and opening up the transmission? Is there a way to perform a pressure test? I do not want to remove the transmission if I can do a pressure test before I split the tractor. This is my first post to this forum. Thanks for your help! 
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.
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