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Wacker Neuson G120


Rugged and reliable power anywhere, anytime.

The G120 is big on power and features to meet your market and job site needs. This durable, sound attenuated diesel generator provides mobile prime power for larger construction, commercial, industrial, special event and emergency management applications where quiet, reliable power is needed. The digital controller monitors and protects the generator and engine. The standard environmentally friendly features include a 115% fluid containment, crankcase oil vapor recovery system, no mess oil and radiator drain hoses and fast fuel fill system that minimizes fuel spill potential.

  • Brushless alternators with separate excitation and AVR (Automatic Voltage Regulation) provide excellent motor starting and an enhanced ability to run non-linear loads.
  • Simple, one switch start for easy operation and easy voltage selection using a lockable voltage selection switch.
  • Rated power up to 120°F (49°C) for optimum performance even in hot climates. For cold climates, add many of the factory installed options like the cold weather package or battery charger, etc.
  • Easy to use keypad for service diagnostics; engine diagnostic codes display on the LCD readout simplifying engine troubleshooting, fuel consumption, percentage load, kW per hour and other data available.
  • Also available, heavy-duty, dual axle trailers with aluminum diamond plate fenders are road ready with DOT lighting, chains height adjustable coupler and choice of surge or electric brakes.




L x W x H Operating (Skid) in 110 x 45 x 64.5    
L x W x H Shipping (Skid) in 113 x 47.5 x 76.6    
L x W x H Shipping/Operating (Trailer) in 176 x 80 x 90    


Weight Dry (Skid) lb 4,725    
Weight Operating (Skid) lb 6,163    
Weight Shipping (Skid) lb 4,912    
Weight Operating (Trailer) lb 7,533    
Weight Shipping (Trailer) lb 6,095    

Operating data 

Trailer coupling Type Pintle    
Standby output   kW 106    
Prime output  kW 96    
Voltage 3 Phase V 240/480    
Current 3 Phase (Prime) A 289/145    
Current 1 Phase (Prime) A 120/240    
Voltage 3 Phase V 208, 220, 240, 416, 440, 480    
Voltage 1 Phase V 120, 127, 139, 240, 254, 277    
Circuit breaker (Main) A 350    
Frequency  Hz 60    
Power factor 1 Phase cos Φ 1~ 1    
Power factor 3 Phase cos Φ 3~ 0.8    
Sound level (LwA) at Prime (23 ft / 7 m)dB(A) 70.6    
Receptacles -20 Amp GFI Duplex 2    
Receptacles -50 Amp Twist Lock 3    

Engine / Motor 

Engine / Motor  Liquid-Cooled, 4 Cylinders    
Engine / Motor manufacturer  John Deere    
Emissions Certified Tier 3    
Displacement  in³ 275    
Operating performance ISO 3046 hp      
Operating performance SAE J1995, ISO 8528-1 hp 158    
at rpm  rpm 1,800    
Coolant Capacity US qt 23.8    
Engine oil Capacity US qt 15.9    
Fuel type  Diesel    
Fuel consumption (Prime Load) US gal/h 7.4    
Tank capacity -Fuel US gal 199.8    
Quantity (Battery) 1    
Battery  V 12    
Generator model  Mecc Alte, Brushless w/AVR    
Voltage control No Load to Full Load +/-% 1    
Voltage control Steady State +/- % 0.2    
Generator insulation (class)  H    
Frequency (Generator Speed) Hz 60    
Runtime at 100% Prime Load h 24.8    
Runtime at 75% Prime Load h 31    
Runtime at 50% Prime Load h 43.4    
Runtime at 25% Prime Load h 81.5