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JD 2940 Hydraulic Question

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Mike

10-29-2002 03:03:56




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I recently purchased an '82 2940. I went a drive the tractor twice before I bought it, but about a hour after I had it back home, it started to make a whinning noise. It comes and goes but when it is making the noise the power steering works. When it stops, the power steering does not work. The brakes are fine, the main pump up front isn't hot. The transmission/ hydraulic oil was low when I got it so I filled it up, but that did not help. Any suggestions would be appreciated. Thanks.

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Jim B

10-30-2002 05:00:49




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 Re: JD 2940 Hydraulic Question in reply to Mike, 10-29-2002 03:03:56  
Mike,you can change filter without draining tranny,but to clean screen you have to drain tranny.You don't have to replace screen unless it is damaged.It runs crossways in bottom of diff. housing.If after changing you still have a problem you may have an internal leak(hi-lo,pto,rockshaft valve,steering or scv)Also I think there is a screen in inlet of main hyd.pump that should be cleaned.Hi-LO pipes have been known to crack on these tractors.Jim B

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dan harrington

11-05-2002 12:27:23




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 Re: Re: JD 2940 Hydraulic Question in reply to Jim B, 10-30-2002 05:00:49  
I noticed your question about jd hydraulic system.
From my experience when the pump in front stops making noise it is not getting oil.As in your case it operates sometimes you possibly have leak somewhere.It could be in hi lo unit,brakes (if it has power brakes}or pto.If the pto is turned off and you still have it that rules out the pto.The clutch packs in the hi lo unit have zero pressure in the low gear so if the steering stops working when in high you have leakage in the hi lo unit.
It is possible your transmission pump also may be worn or relief valve may be faulty or sticking.There are procedures for checking condition of trans pump.Either way make a proper diagnosis before repairing.Best of luck.

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Jim B

10-29-2002 05:04:47




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 Re: JD 2940 Hydraulic Question in reply to Mike, 10-29-2002 03:03:56  
Mike,start by changing hyd.filter and clean suction screen in bottom of trans.The brakes work off of trans.pump.It would be good to invest in a manual.The hyd. systems are a little complex.Jim B



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Mike

10-29-2002 06:20:15




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 Re: Re: JD 2940 Hydraulic Question in reply to Jim B, 10-29-2002 05:04:47  
Jim,
Thanks. Do I need to drain all of the oil out of the trans. to change the filter and clean the screen. Is the screen near the filter? I have a manual coming, but would like to get moving on fixing this problem. Thanks again.



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joe c

10-29-2002 11:35:28




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 Re: Re: Re: JD 2940 Hydraulic Question in reply to Mike, 10-29-2002 06:20:15  
sometimes you need to drain all the oil to change them. If you buy a new screen and filter you should be able to change them without loosing more than a couple gallons of oil. If you try this and you notice lots of filings in the oil that is coming out drain it all and replace it with new oil. the screen should be behind the filter inside a approx. 2 inch plug with square 1/2 inch hole in it.

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Mike

10-30-2002 03:28:29




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 Re: Re: Re: Re: JD 2940 Hydraulic Question in reply to joe c, 10-29-2002 11:35:28  
Thanks for your help, Joe.



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