John Deere 720 power steering leaking on roll a matic

Hey guys I have a 720 there is a pretty bad leak that's pouring onto the roll a matic how big of a job will this be to fix. What should I expect?

If the leak is in fact at the very bottom of the steering
pedestal it's leaking past a simple O-ring.

Trouble is replacing it requires removal and COMPLETE
disassembly of the steering pedestal and as you go through all
that tbere's a GREAT potential of uncovering many other
issues/details that require attention. I suggest you obtain a
copy of the Deere two cylinder power steering manual & study it
before proceeding.

I have done my John Deere 730. It wouldn't hold the oil either. There is a John Deere service manual that is specific for the power steering repair on two cylinders. I might have ordered it from JenSales. Your problem probably is an O ring that seals the reservoir and the main steering shaft so oil doesn't run out of the bottom. It is basically straight forward taking things off and laying them aside in the reverse order that they will go back on. I believe I replaced all of the gaskets at reassembly which would not have to be done. I also replaced the seals on the vanes in the rotary cylinder at the bottom. That would not have to be done necessarily. Once you have done one I would think someone with experience could do one in half a day. I believe I replaced a large cork dirt seal in the bottom somewhere. You also have to have some end play in the main up and down steering shaft when finished. Clearance is measured with a feeler gauge. That clearance took awhile to get perfect. Most of the little sub-assemblies on top (worm gear, valve, etc.) just unbolt and you really don't take them apart. The tractor does have to be supported under the frame behind the front wheels since the pedestal has to come off. I believe I used a stack of mounted spare wagon tires and some 2 by 6's. Probably a more straight forward job than it seems.

(reply to post at 17:16:43 10/12/21)

Click to expand...

I seen the manuals on eBay Gona get it . Thanks again.

You have to pull the pedestal and replace o rings my mechanic has done a 620 for me.

I hope you got the notification checked so you get this.
To begin: The parts book diagram is your friend. The work is straight forward.
Cleanliness is necessary.
The nose has to come off--then before much else happens make a protector for the radiator out of thin plywood or some corrugated board so it fits in front of radiator and stays there. When the wrench slips off bolt or fitting you will know why. Tractor is jacked and supported, front wheel assembly removed. Loosen the gear at top. This can be a hassle but best to do while unit is still solid attached to tractor. Loosen the 10 bolts while on tractor, 5 of which will come out to get unit off. Next is have a lift set up to move the unit. I made the stand to support the thing while I worked on it. Parts were on shelf at local dealer. Check the date code and make sure especially the rectangle seals are not older than a few years. Some guys had trouble getting the new ones on. My seals were less than year old and went on easy. Harder to get the old ones off. I will post some pix of the work. Can't recall if the 720 manual covers this activity or I had the PS manual or the IT. Email should work if more ??