I have a Cat 262B S# pdt01245. The boom leaks down approx 1' every 15 min. I thought it was the boom cylinder seals wearing out, so I rebuilt both cylinders, which were in great shape on inspection. There are no external leaks. The machine operates just fine and seems to be able to lift to spec without a problem. Any ideas would be appreciated, since I don't have a hydraulic schematic, it's hard to know where to go next.
Check your message inbox for a hydraulic schematic.