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Tractor Talk Discussion Forum

Lift arms rising by themselves

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John Lloyd

08-10-2007 16:11:02




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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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KEH

08-10-2007 17:17:18




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 Re: Lift arms rising by themselves in reply to John Lloyd, 08-10-2007 16:11:02  

If that's like the Long I have, there is a friction disc that holds the 3ph lever where it is set. If the friction disc is too loose it lets the lever move up of its own accord. There is a nut that holds the lever on the mechanism that can be tightened to solve the problem. Sometimes the disc mechanism will get corroded and you will have to take it off to clean it. Symptom for that problem is if the lever is hard to move. Be careful of taking the mechanism off. The hook up is complicated and was obviously designed by a drunk engineer.

KEH

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John Lloyd

08-11-2007 00:53:17




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 Re: Lift arms rising by themselves in reply to KEH, 08-10-2007 17:17:18  
Thanks for that - I was wondering whether it may have been something simple - when I got this old girl the lever was stiff to move so I soaked the area with releasing oil &it moves freely now. Too freely, obviously!



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