The 6018 replaced the 648 loaders. The 6018 was offered with the P218 Onan engine and then The Kohler Command 18 horsepower, 39 cubic inch, 2 cylinder engine. Like the 648 the 6018 came standard with power steering and a rear PTO valve. The 6020 was sold for less time than the 6018 and there were far fewer sold. The 6020 was a 6018 with a 20-horsepower Honda or Kohler. The 6018 was a popular and well-respected machine.