Installation position of the old overbearing 4000 four-wheel drive motor

The old overbearing 4000 four-wheel drive motor is installed at the lower end of the chassis.

Put two electric plates on the motor cover, then press the white gear on the piezoelectric machine on the motor cover, put the big black gear through a short iron shaft, then press the shaft and gear on the motor, then cover the motor and press the motor on the chassis, and the chassis is finished.