What are you calling early. The Cat hydraulic adjusters didn't come out until 7U 42915. Could be you have an aftermarket version??.
I have a 6u3022 (maybe an extra digit at the end) parts tractor with hydraulic adjusters. They look like they match up with pictures of the "earlier hydraulic track adjusters" in the D4 Operations and Maintenance Instructions booklet. These have a grease fitting plus a relief valve. It does not look like it has the the ball check valve.
Aftermarket? Maybe, I don't have the experience to tell. It has the two springs in the recoil spring assembly.
I could get a picture in a few days.
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