Combines walker bearings

I never thought about the timing issue. Just changed one at a time, never had a problem. Are these the metal or wood onesIJ If it's the metal ones, they've got like two bushings inside there. It's very simple and straightforward to do.

When you replace them leave the backs loose, tighten the fronts to 33 lbs then take most of the slack out of the back set,they need to be loose enought to move as they are slotted.Then turn the walker gearcase by hand a few times and ending with the lH walker down then tighten it to spec. then turn the gearcase over one revelution ending with the RH walker down then tighten it, then the same on the inside lH then the inside RH then the center. If things bind up at all you can feel it and back up a step, you should be able to turn it nice and smooth by hand. I like to loosen the backs and re-time them every couple years to make sure all is well.