I had the same problem for the last 25 minutes. Fixed it.
I removed the drawer below to compare slow close red and black gear in the back.
In the front of the red gear, half way up, there is a 1/4 in switch. The black switch moves the internals some. If moved down it releases the retrieval system.
1. Check that the one on the left rail is doing soft close and check that the right side is set to do soft close. (This can be seen when you push the cabinet rails in yet they will stop about an inch out.
It seems that the rails slide close yet sit out an inch. So with the drawer out both side should slide back and the stick out an inch. The cabinet rail will sit out until the drawer rail slides past this point and release the gear to pull the drawer in.
Some how both side needs to work to pull evenly.
I may have had the left side drop down and not pull.
I set both sides to soft close and it worked on one drawer. Then the next one didn’t close correct. I looked in and had the right side drop out of soft close. I pushed the switch up and set it again. Now they all clothes fully.
--
For full context, visit
https://www.homeownershub.com/woodworking/kv-gs4270-drawer-slides-no-longer-fully-close-3089050-.htm
--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)