Working machine

A working machine comprising:

• a ground engaging structure;
• an undercarriage connected to the ground engaging structure;
• a slew ring;
• a superstructure rotatably mounted to the undercarriage and operatively coupled to the undercarriage via the slew ring so as to be rotatable relative to the undercarriage about a first generally upright axis;
• an operator's cab rotatably mounted on the superstructure so as to be rotatable relative to the superstructure about a second generally upright axis;
• a working arm rotatably mounted to the superstructure so as to be moveable up and down about a generally horizontal axis;
• and
• a drive arrangement for moving the ground engaging structure to propel the working machine, the drive arrangement including a prime mover and transmission;
• and
• wherein the prime mover and transmission are housed within the undercarriage, and the entire prime mover is positioned below a level coincident with the slew ring.