Miller Big Blue 400 Mitsubishi Engine Driven Welder Generator – P/N 907805

Delivering 400 amps at 100 percent duty cycle, the Miller Big Blue 400 Mitsubishi engine driven welder generator (P/N 907805) powers heavy structural steel fabrication without thermal cutout. Shipyard contractors and structural ironworkers face expensive equipment shutdowns when running continuous 0.052-inch flux-cored wire or gouging with 5/16-inch carbon rods on undersized machines. This heavy industrial diesel unit pairs a 4-cylinder Mitsubishi S4L2 liquid-cooled engine with a brushless alternator, outputting up to 12,000 watts of peak 3-phase auxiliary power.

The Mitsubishi diesel engine runs at a governed 1,800 RPM, holding operational sound levels down to 68.7 dBA while cutting shift fuel consumption. ArcReach technology lets operators adjust arc voltage at an optional Suitcase wire feeder across standard weld leads, eliminating trips back to the service truck. You run heavy 9-inch angle grinders and ventilation fans from the 120V, 240V, and 480V receptacles while maintaining a stable welding puddle on heavy structural joints.

Key Engineering Features of Miller Big Blue 400 (P/N 907805)

- 400A DC Output at 100% Duty Cycle: Delivers non-stop welding current for heavy stick electrodes, wire feeding, and arc gouging.
- Mitsubishi S4L2 Liquid-Cooled Diesel Engine: Large-displacement 4-cylinder diesel provides high mechanical torque and low fuel burn.
- ArcReach Cableless Remote Control: Adjusts arc parameters at the feeder across standard weld leads without control cables.
- 12,000-Watt Peak / 10,000-Watt Continuous AC Power: Supplies clean 1-phase and 3-phase power for heavy jobsite tools and air compressors.
- Heavy Carbon Arc Gouging Capability: Operates carbon gouging torches with carbon rods up to 5/16-inch diameter for fast defect removal.
- Brushless Generator Rotor Design: Eliminates commutator brushes and slip rings for low maintenance and electrical noise.

Field Durability & Jobsite Power Delivery

Built for structural steel erection and shipyard maintenance, this 400-amp diesel machine delivers extreme duty-cycle stamina.

- A low 1,800 RPM operating speed cuts diesel fuel consumption significantly compared to high-speed 3,600 RPM welding rigs.
- Brushless generator rotor design eliminates slip rings and commutator brushes, lowering scheduled maintenance overhead.
- High auxiliary continuous wattage powers truck-mounted air compressors while operators maintain steady welding arcs.

Plate Thickness Clearance & Field Portability

Weighing 1,655 pounds dry with an exterior length of 65 inches, this heavy diesel machine mounts securely on four-wheel road trailers or custom flatbed welding trucks.

Warranty Coverage & Field Maintenance

- Miller Electric backs the Big Blue 400 generator and electrical power components with a 3-Year True Blue warranty.
- Mitsubishi covers the S4L2 diesel engine through a 2-Years or 2,000-hour commercial warranty through authorized distributors.

Change engine oil and filter every 250 operating hours with 15W-40 diesel oil. Inspect the air filter weekly on dry grading sites, and check generator output studs for heat tightness. Order the Miller Big Blue 400 Mitsubishi engine driven welder generator from Mulmotor.com for guaranteed factory-fresh units, complete manufacturer warranty coverage, and dedicated commercial equipment support.