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This is some testing of my gas powered, skid steered, 6 wheel drive robot, 'Mule". For this fun test I've added a tractor seat for use as a wheelchair/ATV.
The drivetrain uses my custom made transmission giving it full forward, reverse, and skid steering. No hydraulics, differentials, or brakes used.
The weird binding sounds were caused by the lawnmower wheels flexing and hitting the drive chains. I guess a 350 lb vehicle skid steering on dry asphalt was too much for the little wheels!