Changing a Traction Motor on an AC6000 video..my ? When they lift the rear of the engine how is the front truck protected as it is pivoted?

What do you mean by "pivoted?" The front truck's wheels just sit on the rail. It doesn't go any where.

Vertically pivoted...as it is raised does at least one axle remain in its truck. I can't quite picture it

I have seen it done by bringing the front pilot over the edge of the turntable.  Worked pretty neat!

willygee posted:

Vertically pivoted...as it is raised does at least one axle remain in its bolster. I can't quite picture it

A three axle truck generally has a span bolster, which then engages the main center bearing on the underframe. That front truck did NOT become disengaged from its center bearing, thus, no harm no foul.

My first mistake..i thought the motor and axle gears were in an enclosure of some sort with an oil bath. I must be thinking of portal axles.

The traction motor has bearings that go around the axle and support the motor on that side. The other side of the traction motor is supported on the truck frame. The pinion gear attached to  the traction motor armature shaft mates to the bull gear attached to the axle. The two gears are enclosed in a steel gear case that has thick lubricating grease inside. When a traction motor locks up or when a traction motor bearing (the ones surrounding the axle or the ones that support the armature) goes bad then the entire two wheels-axle-gear case-traction motor assembly is removed and a dummy axle/wheel set in its place so the loco can be moved to a repair terminal.

See these... Axle/motor change-out on BN 9207

OWY SD60 axle/motor change-out.