Reely 1:10 RC model car Electric Truggy FS-53328-6 ユーザーズマニュアル

Insert the bevel gear differential "A4" and the rear drive axle "A6"
into the bottom part of the casing labelled "A3". Apply suitable
grease (model gear box grease) onto the tooth flank of both gear
wheels.

Make sure that both ball bearings are properly fitted (see illustration
on the right).

Attach upper casing part "A2" so that the ball bearings are installed
in the guides of the casing parts.

As the last step, attach upper casing part "A1". Now screw casing
parts "A1", "A2", and "A3" together.

Four long tapping screws "S2" (length of thread 15 mm) are screwed
in on the edge, a short tapping screw "S1" (length of thread 10
mm, see illustration on the right) is screwed into the centre of upper
casing part "A1".

The rear differential is now complete.