SIX year old thread,...... but worth an update, I think.
A recent post (by "Captain Dirty"?.... I can't find it now) mentioned zerk fittings coming loose.
He has a Kubota L45 TLB, and he recommended checking zerks for proper tightness, specifically the recessed zerks.
I have a Kubota L48 TLB
The open standing zerks were all fine for me, but every single one of the recessed zerks was at least somewhat loose.
Some of the loader recessed zerks were very loose ( I would assume that the loader was used more than the hoe)
My L48 has only 250 original owner hours.
If you have ANY Kubota machine with the recessed zerks, I would suggest that you check them for tightness.
Loosing a zerk is really not a big deal.....until you try to find an exact replacement zerk locally.