These are built exactly like Athearns.
Take off the shell.
Remove all the electrial connections.
Pry off the gear tower clip.
Put the worm gear and universal joints to the side.
Remove the trucks.
Pry off all the clips that hold the truck halves together. There should be one on the bottom and 2 on the top.
Seperate the halves.
Remove all the gears and put them in a disposable container with lid. Also put the worm gear in the container.
Remove the wheels from the axle/gears by pulling them apart. Replace them with Athearn axle/gears. The Lifelike ones will split, you might as well change them now.
Put some detergent and water in the container with the parts. Place the lid on and shake.
When you are happy with the removal of the factory grease, then dry the parts on a towel or whatever...
********OPTIONAL******
Reassemble the trucks and wire up the unit. Introduce a tooth paste like pearldrops to the gears by removing the bottom truck clip. Run in both directions for 1 hour at high speed. Then dissasemble and clean again. This will remove any burrs in the gears and plolish them.
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Reassemble the trucks and put in a quality oil or grease. It is your choice as long as you use it sparingly.
Solder wires to both halves of the truck frames for pickup (bypassing the mechanical electrical connection in use).
Reassemble the trucks to the frame and reattach the universal joints and snap the worm gear into place taking care with the placement of the bearings.
Hope this helps. It is easier then how it sounds.
David B