John deere 8420t planetary rebiuld

This is a hands-on final-drive planetary rebuild on an 8420T, filmed by the mechanic actually doing the work. It covers sourcing Timken bearing replacements ($1,250 each), freezing races, improvising a bearing heater, reassembling the housing with a crane, and a detailed shim-pack calculation with real torque specs (30, 74, 122 ft-lbs) and depth-mic measurements. Best for owners or techs tackling their own planetary/final-drive teardown who want actual procedure, not a walkaround.

Posted by western truck and tractor repair, an independent shop mechanic documenting real repair jobs as they happen.