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Atlas Copco QAS125 JD T4F Generator

Atlas Copco QAS125 JD T4F Generator


The Atlas Copco QAS 125 JD T4F generators are prime power, multi-voltage, sound attenuated, mobile generators. They are powered by a John Deere T4 Final liquid-cooled, four-cylinder diesel engine.


The units consist of an alternator, diesel engine, cooling system, electrical distribution and control systems - all enclosed within a sound attenuated enclosure fabricated from powder coated steel with zinc rich primer. 6000 hour salt spray tested. A broad range of undercarriage formats and options are available. Special attention has been given to the overall product quality, user friendliness, ease of serviceability, and economical operation to ensure best in class total cost of ownership.

All QAS generators include the latest Tier 4 Final engine and have a footprint that is up to 20 percent smaller than the previous generation. The starting mechanism ensures that stable power is achieved in less than six seconds.

View and/or Download QAS 125 JD T4F: Datasheet / Brochure

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  • Compact, sound attenuated, corrosion resistant, with single point lifting and 110% fluid containment
  • Available as a skid mounted unit with forklift pockets, or on a single axel trailer
  • Heavy Duty alternator with AREP excilation and marine grade protection
  • "DeepSea" controller
  • Single side servicing with long run filters and 500 hour service intervals
  • Extremely reliable and durable John Deere 4045 engine with DOC & SCR after-treatment and 5 year limited warranty
  • Identical enclosures and maintenance points between both models
  • Emergency Stop
  • Remote Start / Stop




  • Extremely durable and environmentally sensitive designed to be used for everything from the oil patch to special event power
  • Versatility, giving you the flexibility to match your machine to the correct application
  • Start-up power for the most demanding sites with 300% over load starting capabilites
  • Reliable and intuitive controls for ease of use and diagnostic capabilities
  • Heavy duty oil, air and fuel filters extend themaintenance interval to 500 hours for reduced total cost of ownership
  • Reduces maintenance costs with long intervals easy access for mechanics
  • Proven engine platform with high reliability, a simple maintenance free Diesel Oxidization Catalyst onlyafter treatment
  • Reduces stock of service kits and inventory of parts withrental ROI kept in mind
  • External, recessed emergency stop for increased safety
  • Allows connection as a critical back-up unit via a 2 wire dry contact connection in the distribution panel


    Performance  Units QAS 125 JD 
    Frequency  Hz  60 
    Rated prime power 3ø  kW/kVA  100 / 125 
    Rated standby power 3ø  kW/kVA 

    110 / 138

    3ø Power factor    0.8 
    3ø Voltage in 480V switch position (series 480Y / 277 
    Amp capacity @480V  150
    3ø Voltage in 240-208V switch position (p 240YY / 139-208YY 

    Rated prime power @ 240V 3ø


    100 / 125

    Amp capacity @240V  300.8

    Rated prime power @208V 3ø


    86.5 / 108

    Amp capacity @208V  300
    Rated prime power 1ø  kW/kVA  65 / 65 
    1ø Power factor   
    1ø Voltage in 120-240V switch position (Zi 240 / 120 
    Amp Capacity @240V  271 
    Amp Capacity @120V  271 x 2 
    Main breaker - Rated Current in  400 
    Power distribution - Terminal board    5 Wire (L1, L2, L3, N, Ground) 
    Terminal board connections    Bare Wire Terminals 
    Maximum terminal cable size    350MCM 
    Convenience receptacles    2 x NEMA 5-20R & 2 x

    125/250V 50A CS6364 

    Max. sound pressure level (LPA) @23' @75% Load 

    dB(A)  73 
    Fuel and DEF Systems  Units QAS 125 JD

    Fuel consumption at 100% load (PRP)

    gal / h


    Fuel consumption at 75% load (PRP)

    gal / h 


    Fuel tank capacity



    Fuel autonomy @75% load & 90% of fuel capacity



    DEF Tank Capacity

    Gal (L)

    9.19 (34.8) 

    Alternator   QAS 125 JD
    Model   Leroy Somer 44.3 S5

    Excitation system


    AREP (auxiliary winding)

    Automatic voltage regulator (+/-0.25%)   Leroy Somer D350
    Insulation   Class H


    Engine  Units QAS 125 JD
    Model    John Deere 4045 HFG04 
    US EPA Family    HUDXL0.4.531
    US EPA Tier    Tier 4 Final
    Displacement  L 4.5 
    Cylinders    4
    Continuous engine output  hp 157
    Gross engine power output  hp 172
    Speed  rpm 1800
    Engine control    ECU
    Aspiration   Turbo w/ Intercooler
    Engine oil capacity  US gal 5.4
    Engine coolant capacity  US gal 2.25
    Max. ambient temperature (@Sea Level)  ºF  122
    Min. starting temperature (w/o Cold weather options)  ºF  14
    Minimum starting temperature (w/Cold weather options)  ºF  -13
    Electrical system (Negative ground)  V 12
    Engine alternator output  A 90
    Battery Capacity (Cold Cranking Amps)  A 1100
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