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3 Pt works great cold not hot

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ChrisCT

01-13-2002 16:30:57




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Hello all,
I have a different version of three point hitch problems than I have heard of yet. My three point hitch works great when cold. I started up this morning (41 9N) and it was about 35 F. Right after I started up I stood at the very end of my back blade and had my son slowly raise me to the top of the three point travel. The tractor was at a slow idle and it was very smooth action and raised up with no hint of effort. After running the tractor for about 1/2 hour with the PTO running at a high rpm, I tried the test again.
No luck, the three point cannot lift me and the blade. If I raise the blade all the way then put my full weight on it I am able to push the blade almost all the way to the ground. Even at full throttle I can push the blade towards the ground.
Any ideas are greatly appreciated.
ChrisCT

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ZANE

01-13-2002 18:00:52




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 Re: 3 Pt works great cold not hot in reply to ChrisCT, 01-13-2002 16:30:57  
You should first take off the right hand inspection plate under the seat on the side of the lift housing.With an implement on the lift start the engine and with the lift in the up position look inside and see if their is oil leaking from the end of the lift ram cylinder.If their is only a slight drip this is normal.If their is a fairly steady stream this may be the trouble.If the oil is coming from somewhere else try to pin point its orign. If you find no appreciable leaks on top in your view then you may have a pressure relief valve leaking. It is located just under the pto shaft on the vertical back of the pump.Sorta shaped like a spark plug and an 11/16" box end wrench fits it. You can check it for leakage by first finding it with the engine off and then with the pump running and with a load and hot put your finger over the end of the relief valve and if it is leaking enough to be a problem you will be able to feel the oil push your finger off the end of the valve slightly.You can check it by washing it up and then soaping it real good with some dishwashing detergent and water and apply air to the end that goes into the pump. If it is leaking you should replace it with a new one. The part # used to be 8N638. Hope this will give you some starting places. Zane in Al.

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Dell (WA)

01-13-2002 16:58:53




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 Re: 3 Pt works great cold not hot in reply to ChrisCT, 01-13-2002 16:30:57  
Chris..... ..my guess, temp has a lot to do with it and a leaky gasket or piston. When cold, the oil is sluggesh enuff that it donnna leak too fast and thats why you can lift. When oil gets hot and thin it leaks faster than pump can pump.

Heres what I'd do. I'd take the 6" round dipstick plate off and with a flashlight look up inside for squirts. Then you'll know where and what to do..... ...Dell

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Thanks for the advice Dell and Zane I'll follow up if anything different

01-14-2002 05:29:30




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 Re: Re: 3 Pt works great cold not hot in reply to Dell (WA), 01-13-2002 16:58:53  
Good advice, I kinda guessed thats what you would say. I just wanted an educated opinion vice mine.
ChrisCT



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