load control shaft leaks

John Deere 1520 leaks hydraulic fluid where the 3 point hitch lift arms pivot at the tractor end of the arms. There is an o-ring with a seal inside of it that the shaft is pushed thru. The shaft goes thru the differential/hydraulic housing and the lift arms slide onto the ends of the shaft that protrude from both sides of the housing. Does anyone know the correct way to replace these o-rings and seals.
Thank you, gregjo1948
 

One needs to drain hyd oil to change o-rings if shaft is removed for inspection for wear. Be sure when reinstalling draft arms to shim all side play out od L/D shaft. This would be a good time to inspect hyd oil sump screen for debris.
2ea-R460R O-Ring - O-RING, PACKING ADD 2.07 USD 4.14 USD
2ea-T22095 Seal - RING,SEALING ADD 5.35 USD 10.70 USD

*Total 14.84 USD


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The shaft is fine. My problem is installing the sealing washers inside the o-rings. Do I need to remove the bushings from the housing where the o-rings and sealing washers are installed? After heating, to soften, the sealing washers, they can be folded and installed inside the o-rings but, it's difficult to unfold them once inside without damaging them. If the bushings, where the o-rings and sealing washers are to seat, were removed, it would likely make installing the washers easier. How do I remove the bushings, if that is needed?
Thanks, gregjo1948
 

O-rings & sealing rings can successfully be installed without damage while bushings are still in tractor. To remove bushings one needs a long bar or rod to drive each bushing out from opposite side of trans case
 

O-rings & sealing rings can successfully be installed without damage while bushings are still in tractor. To remove bushings one needs a long bar or rod to drive each bushing out from opposite side of trans case[/quote]

How would you recommend installing the sealing washers?
 
Installing the oring and seal washer is easy. Much easier than removing the bushing just to replace the oring and seal washer . All you need to do is put the plastic sealing washer in a cup of HOT water. Let it soften up. Then hold the washer in your fingers. pinch it close and fold the ends together. It will kind of look like a "W" when folded. Grab the folded part LIGHTLY with a pair of needle nose pliers. Install it into the grove over the oring with the bottom of the "W" against the oring. Then reach in with a long flat screw drive that has a nice round shank. Using the round part to work the sealing washer back into a circle. Then slide one end of the load shaft into it while kind of wiggling the shaft through the seal washer. Your working the shaft around to make the seal washer expand out tight against the oring.

The key is to soften the sealing washer in hot water. Then I usually use spray silicone on the load shaft when I install it. Do not rotate the load shaft as your sliding it through the seal rings. They are supposed to be a tight fit on the shaft and rotating the load shaft will damage the seal washer or the oring under it.

Also shim the lift arms tight so there is ZERO end play when everything is back together. The load shaft working side ways is what takes out the seal washers and orings. Also you say your load shaft is good. If there is any wear it will leak. Even if it "feels" smooth it can be worn undersize and then it will not seal.

DO you handle round bales with a three point spear with this tractor???? The reason I am asking is we had few leaks before round bales became common. Then we got lots of load shaft seal leaks.
 


I just got this tractor and don't know if the bales were handled with it. I already installed the o-rings and sealing washers. Almost exactly as you suggested. I used a heat gun to soften the washers instead of hot water and I used a round shank punch instead of a screwdriver. I think I may have twisted the shaft as I pushed thru. I have one side still leaking about a dozen drips in a day. I have 2 more washers coming. I'll try the hot water this time. Thanks for the advise. gregjo1948
 
The heat gun is your problem if the shaft is not scorn. You can easily over heat or under heat the washer with the heat gun. Hot water is more even and easier to do. I just use tap water too.
 

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