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Front and rear axle steer are independent and powered by two M motors. One differential is applied to balance left/right wheels rotation in case of conventional steer. Switch to skid steer mode is done by pneumatics mechanism, which is also powered by one M motor. Chassis with pendular suspension and two XL motors for propulsion. LED head and tail lights which are connected to propulsion system and pneumatics respectively. Two RC receivers and two LED sets are used.
Video is available on Youtube via the link:
For more detailed photos please check the post on Eurobricks: More Photos
Skid steer mode.
Core of powertrain.