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Miller Big Blue® 400 Pro (CAT) #907774

Part Numbers: 907774
UPCs: 715959671811
1 Review

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Welding type:







Engine Driven

Engine Driven

Material type:

Mild Steel

Mild Steel

Stainless Steel

Stainless Steel



  • Multi-Process
  • Multi-Phase
  • Engine Driven
  • 3-Year Warranty

Miller Big Blue® 400 Pro (CAT) #907774

Designed with the professional in mind, the Big Blue 400 Pro is the best for ease of use, reliability, and fuel economy.

Miller Big Blue 400 #907774Features:

NEW Heavy-Duty Low-Speed CAT Industrial Diesel Engine

  • With the reliability you expect from Miller, the CAT C1.5T turbocharged three-cylinder, liquid-cooled, industrial diesel engine is backed by world-class support and service through the global CAT dealer network

Dynamic DIG™

  • Unlike conventional DIG that provides a preset amount of short-clearing current, Miller’s proprietary Dynamic DIG works on a time-based algorithm that automatically adjusts the amount of current required to clear a short
  • What does this mean? A smoother more consistent arc that can be tailored to match application, material, fit-up, and welder technique

Industrial USB Port

  • Quickly upload the latest software and download machine log files to retrieve in-depth information such as diagnostics and machine statistics

Superior Arc Performance

Four preset DIG settings:

  • (Stick) Hot Start™
  • (Stick) Lift-Arc™
  • TIG with Auto-Stop™
  • Crater-out MIG/FCAW arc performance

Quiet Operation

  • Improves work site safety and communication

Simple-to-Set Controls

  • Requires no elaborate procedure - just select process and weld!

Auto Remote Sense™ (ARS)

  • Detects if remote control is plugged into the 14-pin receptacle and eliminates the confusion of a remote/panel switch

Thermal Overload Protection

  • Prevents machine damage if the duty cycle is exceeded or airflow is blocked

Meter Maintenance Displays

  • Fuel gauge
  • Hour meter function
  • Oil change interval
  • High coolant temperature and low oil pressure shutdowns
  • Low fuel shutdown - engine shuts down before system runs out of fuel, making restarts easy.

Other Standard Features

  • Digital preset weld meters, output contactor control, and automatic idle
Check out a full selection of MIG, TIG, Stick, and Gas welders available at Welder's Supply.

Miller Big Blue® 400 Pro (CAT) Specifications

Industries Interests

Cross Country Pipeline
Pipe Fabrication / Construction
Mechanical Contracting
Mechanical Contracting


Air Carbon Arc Cutting and Gouging (CAC-A)
Flux Cored (FCAW)
Stick (SMAW)

Engine Brand



Lift Eye (Standard)
Trailer (Optional)


3 Years
Miller's True Blue Warranty


Height: 32.00 Inches
Width: 26.50 Inches
Length: 56.00 Inches
Weight: 1010 Lb(s) 0 Oz

Manufacturer Reviews

By: They call me aka the moose
I started my welding bissness back when I was 19 started out with the Miller bob cat 225 then moved up to the Miller trailblazer 302 had it for all most 16 years and the motor spun a rod bearing. So know iam move up to a big blue 400 x pro looking forward to working with this machine for the next 20 years or till I retire once I take delivery of the unit and have it wrapped with my logo I will put it on the Miller website so everybody can see

Product Questions and Answers

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