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Lift arms rising by themselves
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Posted by John Lloyd on August 10, 2007 at 16:11:02 from (86.138.187.29):
I'm using a tractor with a TPH mounted implement basically for the first time ( an Universal 445DT sold as a Long445 or Allis 5045 in USA ) & running a 5 ft Rhino topper similar to a Bush Hog with a rear castor wheel. I've selected position control & set the TPH arms for a suitable height to cut very thick 3 ft high rushes & positioned the stop so I can get back to that height after raising the topper. I start to cut at about 3 mph but I find after 100yds or so the arms are starting to lift by themselves, so I have to hold the TPH lever down against the stop continuously. The land is basically flat, but it seems that the tussocks of rushes each push the arms a little higher until after 1-200yds the rear wheel is completely off the ground & the topper will continue to rise to max height. Is this normal? I had assumed that once set to a height the lift arms would stay put? What should I set out to check if it does represent an issue with the hydraulics?
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