Lift truck having hydraulically separate main frame and power unit assembly

A lift truck comprising:

• a power unit assembly comprising a power unit base having front and rear portions, at least one wheel, at least one traction motor for driving said at least one wheel, a battery for providing power to said at least one traction motor, and at least one traction motor control module for controlling the operation of said at least one traction motor, said at least one wheel, at least one traction motor and at least one traction motor control module being mounted in said rear portion of said power unit base;
• a main frame assembly comprising a main frame base having front and rear portions, a mast assembly, a carriage assembly coupled to said mast assembly, and hydraulic drive apparatus coupled to said mast assembly, said front portion of said power unit base being coupled to said rear portion of said main frame base such that said main frame assembly is detachable from said power unit assembly without requiring disconnecting hydraulic connections to said power unit assembly, and said hydraulic drive apparatus comprising a hydraulic motor/pump assembly receiving power from said battery of said power unit assembly;
• and
• wherein said power unit assembly further comprises a hydraulic drive apparatus control module mounted in said rear portion of said power unit base for controlling the operation of said hydraulic drive apparatus.

A lift truck comprising:

• a power unit assembly comprising a power unit base, at least one wheel coupled to said base, and a system for driving said at least one wheel;
• a main frame assembly detachably connected to said power unit assembly, said main frame assembly comprising a main frame base, a mast assembly coupled to said main frame base, a carriage assembly coupled to said mast assembly, and a hydraulic drive apparatus, wherein substantially the entirety of said hydraulic drive apparatus is provided on said main frame assembly such that said main frame assembly is detachable from said power unit assembly without requiring disconnecting hydraulic connections to said power unit assembly, said hydraulic drive apparatus comprising a hydraulic motor/pump assembly receiving power from a battery of said power unit assembly;
• and
• a control module controlling the operation of said hydraulic motor/pump assembly of said hydraulic drive apparatus, wherein said control module is mounted on said power unit base.