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J D 2 cyl. powered steering

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Andy Conner

11-24-1999 17:20:41




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The power steering in our 730LP was easier one direction than the other so we got the repair book from John Deere and tore into it.
1. Pump pressure & volume are good 6.5 GPM @ 1200 PSI
2.Centered Valve to get lowest pressure . approx.100 PSI
3. set relief pressure to 1200 PSI

the problem is that the steering now seems to hydraulicly lock up !

4. we then took the worm shaft (improved design)assy apart. I feel this may be the root of the problem as the pressures seem to be OK. Has anyone out there worked on these systems enough to give us a direction to go. I would really like to understand this system as we have a 520 with "slow" steering as do many other JD owners I know.
Any help would be appreciated !!!
THANKS , ANDY

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zane

11-25-1999 17:23:55




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 Re: J D 2 cyl. powered steering in reply to Andy Conner, 11-24-1999 17:20:41  
My experience is similar to Chuck's. Wear on the vane seals seems to make them want to lock up in the direction steering is easier. Direction sensitivity adjustment (centering valve housing) is very important and also very tedious. I've never been able to do without a helper at the steering wheel.



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STMTS

11-24-1999 17:43:14




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 Re: J D 2 cyl. powered steering in reply to Andy Conner, 11-24-1999 17:20:41  
On my tractors it seems very important that all the end play is set right.And also the little fork from the control valve that runs in the operating sleeve wears on one side.Then there isn't enough travel to go both ways properly. They say around here it is from row crop work always turning the same way all the time.And the double duty they preformed.I've had a std.720 the steering worked fine both ways.The std;s didn't have as much that they could do.

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Chuck

11-24-1999 19:00:35




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 Re: Re: J D 2 cyl. powered steering in reply to STMTS, 11-24-1999 17:43:14  
have had several of these apart...the first thing you need to do is put new seals in the vanes. take the pedistal apart and you can install...your pressure is going past the vanes..and you may have broken parts there...I've got a photo of one apart if you want to email me...you need the valve control in good condition with the acuators in good shape....



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