I checked, there are none on my piece. However, I'm really not concerned about it. I'll try to be brief with my logic.
In 1972 I bought a new MF135 diesel PS. My neighbor (a JD man) promptly condenmed it because it had no axle pivot zerk.
10 years and 5000 hours later I sold the old girl, not by choice I might add, and that same pivot pin was still there, doing it's job. Lots of those hours she carried 400 lbs of weight on the bumper to hold down a 4 row rolling cultivator with 400 lbs. of fertilizer on the 3 pt.
My original plan was to buy a 135 and restore in to new condition, no matter the cost. However, the creature comforts, functionality, and yes, looks, of the 2810 HST sold me.
If the old 135 is a true indicator, I don't expect I'll be around when the pivot pin in the 2810 gives up.
We're talking a joint that rotates in degrees, not revolutions.
That my friends, is my opinion. Take it for what it's worth with my blessings.