The preload is set using the torque of the nut holding the yoke in place. To get the yoke off, leave the nut on so that it is flush with the end of the pinion shaft. Then grab a hold of the yoke with one hand and tap the nut/pinion with a hammer until the yoke pops off, just make sure you do not miss and hit the yoke. Pull the cover off and let all the oil drain out of it otherwise you make take a bath in it when you go to pull the pinion seal off.
When you are done putting the seal back on, slip the yoke on and put the nut on. When you go to to use the impact gun on thenut, I suggest using a very large pair of pliers to hold the yoke. If you go to use your hand to hold it, you'll break your wrist. Keep tightening that nut until there is no play in it. You should actually have a dial indicator to measure the backlash before and after you do this just to make sure everything is in place.
Tom
Tom
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