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2N lift cycling up and down

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Ultradog MN

05-19-2002 11:11:53




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I replaced the piston on my 2n a few weeks ago with the NAA type. I replaced the Pressure relief valve when I took it apart. Everything has been working good - lifted good and was able to hold up a very heavy 7 1/2' disc all night without bleeding down hardly at all.
Then this weekend it started acting up on me.
You can lift an implement and it goes right up but then lowers right back down.
If you keep it in the up position it starts to cycle up and down. All the way up and then all the way back down. Will not stay in the up position.
What gives? anyone have a clue?
I put new oil in it too btw.

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ZANE

05-19-2002 16:01:26




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 Re: 2N lift cycling up and down in reply to Ultradog MN, 05-19-2002 11:11:53  
Sounds like a sticking control valve to me. The heavier the implement the more likely it is to stick because the pressure of holding the implement tends to push the control valve to one side and if it is a little rough it makes it want to stick.

There is a spring that is connected half way between the top of the lift control rods and the bottom of the control rods. It is also connected to the rear of the ram cylinder. If this spring looses it's tension over the years it will cause the control valve to be much more prone to stick. This spring is what makes the control valve move in and out. It is designed primarily to prevent damage to the control valve linkage from shock loads caused when the implement comes in contact with an immovable object and the top link is violently jammed in against the linkage. If this spring were not there it would jam the linkage and control valve violently too.

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