Are you talking about the drive belt for the hydraulic pump on the right side of the engine compartment? I've replaced the alternator belt on the left side which also powers the fan, and it was hard to get the metric belt, but installation wasn't that bad... Was that drive belt hard to replace? Does it have a tensioner that needed to be replaced too?I wouldn't put it past myself, but thankfully this time I didn't screw up that bad!
After changing all hydraulic filters and removing obstructions, the issue persisted. Finally found that the drive belt was loose and tightening it up solved all of my power issues. Probably should've checked that first. Thank you everybody for the wealth of knowledge!