Patent Number: 
Section: claims

1. A modular power unit for a work machine, comprising:an engine;a generator connected to the engine;a battery connected to the engine but not the generator; anda heat exchanger foldably connected to the engine, with the engine, generator, battery and heat exchanger being self-contained, unitary and configured to be removable and replaceable from an engine compartment of the work machine as a single unit without removing any other modules or parts of the work machine. 2. The modular power unit for a work machine of claim 1, wherein the heat exchanger foldably connected to the engine is positioned directly over the battery and the engine. 3. The modular power unit for a work machine of claim 1, wherein the heat exchanger foldably connected to the engine is removed to allow access to the battery and the engine. 4. The modular power unit for a work machine of claim 1, wherein the modular power unit is not integrated with the work machine. 5. The modular power unit for a work machine of claim 1, wherein the heat exchanger foldably connected to the engine is not removed from the modular power unit when the battery and the engine are tested. 6. The modular power unit for a work machine of claim 1, wherein the heat exchanger foldably connected to the engine can be folded in a vertical direction to allow access to the battery and the engine. 7. The modular power unit for a work machine of claim 1, wherein the battery and the engine can be separately removed apart from the modular power unit. 8. A work machine, comprising:a chassis;an engine compartment supported by the chassis;an engine mounted on the chassis and within the engine compartment;a generator connected to the engine and mounted within the engine compartment;a battery connected to the engine, and mounted within the engine compartment, but not connected to the generator; anda heat exchanger foldably connected to the engine, the engine, generator, battery and heat exchanger forming a modular power unit that is removable and replaceable from the engine compartment as a single unit without removing any other modules or parts of the work machine. 9. The work machine of claim 8, wherein the heat exchanger is positioned directly over the battery and the engine. 10. The work machine of claim 8, wherein the modular power unit is not integrated with the work machine. 11. The work machine of claim 10, wherein the modular power unit is removable from one work machine and installable in another work machine. 12. The work machine of claim 9, wherein the heat exchanger is removed from the modular power unit when the battery and engine are being serviced. 13. The work machine of claim 9, wherein the heat exchanger can be folded in a vertical direction to allow access to the battery and the engine. 14. Amethod of operating a plurality of machines with a plurality of modular power units, comprising:providing a plurality of work machines;providing a plurality of modular power units, each power unit including an engine, a generator, a battery and heat exchanger, each modular power unit being mounted in an engine compartment of one of the work machines;removing the modular power unit from the engine compartment of the work machine without removing any other modules, parts or systems of the work machine;installing the modular power unit in another engine compartment of another of the plurality of work machines without removing any other modules, parts, or systems of the work machine.