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4020 Hyd. Pump - Piston cap o-rings / seals

G

Glen D Anderson

Member
Good morning,

Planning on addressing some leaks on the hyd. pump on our 4020(_______-200,999) and I was hoping someone could shed some light on the sealing system for the caps that retain the pistons / springs.

Working on pumps from our other tractors in the past I recall being provided with a teflon sealing washer in addition to the o-ring for the cap as part of some update. As I recall, the teflon washer was to be installed between the o-ring & the pump. Looking back on that I can't see how that would even work. My thoughts is that the washer could deform / pile up during installation preventing the o-ring from sealing at all?

I've attached pictures of the pump in question showing one of the caps that obviously has the teflon washer installed. Ironically, it happens to be one of the 2 that's leaking......

Long story short, what's the best fix for re-sealing these caps?

TIA




mvphoto47997.jpg

mvphoto47998.jpg


mvphoto47999.jpg
 
To add to what D- said the Teflon does go over the o-ring,, and there are 2 sets of o-rings in the kite that look alike,,,but they are different,,so be sure you use the correct one,, the wrong one is a bit larger in diameter and it will cut a bit as it tightens down,,it will be okay for a week or so.......then you know what happens....Darn it..
 
Thanks for the replies.

Would you happen to know what the P/N is for the correct o-ring & teflon washer? Stumbling around on the JD parts site I see a few different P/Ns including one that when plunked into Google its listed as a BSP sealing washer, which can't be right?

Out of curiosity, any idea why this particular application causes issues with the o-rings? I've worked with plenty of ORB fittings & have never had an issue damaging an o-ring especially if some type of lube is used during assembly.....
 
Most ORB fittings have a washer or larger flange. These plugs just barely cover the orings causing this issue, in my opinion.
 
Thanks to all for the replies.

So, just to confirm that I have the proper P/Ns?:

R56463 o-ring

AR101236 dust shield(the teflon washer)


Also, checking one last time that the washer is actually supposed to be installed between the o-ring & pump?


Thanks again......
 
I wanted to revisit this again before I order parts.


What is the preferred o-ring for the hyd. pump piston caps?:

R495 - H4C Nitrile elastomer 75 durometer

OR

R56463 - H4P Fluorocarbon elastomer 75 durometer



TIA


(quoted from post at 05:22:34 01/20/20)
Spec's for each o-ring is shown below. From inspecting spec's size of o-rings are the same but material o-ring is made of is different(H4C vs H4P) .

mvphoto48080.png


mvphoto48081.png
Click to expand...
 
Thanks Jim!

I came to the same conclusion after browsing through the parts diagrams a few more times. That said, I did a Google search on fluorocarbon vs nitrile o-rings & the consensus seems to be that nitrile has superior abrasion resistance over the fluorocarbon. Considering that all input here, regarding the o-ring failures, is damage to the o-ring during assembly one would think that nitrile would be the material of choice?

Guess I'll just try the R56463 & see what happens? LOL

(quoted from post at 05:16:04 02/09/20)
After viewing JD parts descriptions I think JD engineers think "R56463" is the correct o-ring choice for piston caps on hyd pump less SN plate.

mvphoto49022.png
Click to expand...
 
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