Cummins Onan

Commercial QG 4000

Cummins Onan Commercial Generator

Commercial QG 4000 Gasoline

  • Suitable for medium-duty commercial mobile applications
  • Microprocessor control with diagnostics
  • Smooth, quiet operation
  • Sealed connectors
  • Full housing with enclosed muffler
  • Lightweight, compact
  • Overhead valve engine
  • One-year/1000-hour limited warranty (commercial)
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Standard Features

  • Microprocessor control with digital voltage regulator
  • Starter overcrank protection
  • Generator set field overload protection
  • Over/under frequency and voltage protection
  • Loss of AC sense protection
  • Mechanical fault, reverse connections and high battery voltage protection
  • 4-point vibration isolation system
  • Magnetic circuit breaker
  • Automatic resetting of DC circuit overcurrent protection for set wiring and remote start wiring
  • Integral enclosure cover and stamped steel base
  • Stationary exhaust pipe attachment point
  • High stability mechanical governor
  • Detects starter faults
  • Sealed remote start connector
  • Automotive-type starter with automatic start disconnect
  • Fuel filter
  • Electronic magneto ignition
  • USDA Forest Service-approved, spark-arresting muffler
  • Cross-flow pressure cooling
  • Automatic choke
  • Electric fuel pump with positive fuel safety shutoff (gasoline)
  • 125 in (3.2 m) generator set output leads
  • Electric fuel shutoff solenoid (LPG)
  • Intake silencer, sound deadening material and baffles reduce sound level
  • Start-stop/prime rocker switch on control with LED status indicator light for set diagnostics

Weight, Size & Sound Levels

Weight: 174 lb (83.4 kg)

Size: Length 30.5 in (774.7 mm), width 20.6 in (523.2 mm), height 16.4 in (416.6 mm)

Sound: 70 dB(A) at 10 ft (3 m), before installation, full load

Model Ratings

Models Fuel Hz Watts Voltage Amps Phase Circuit Breaker
4KYFR65697 Gasoline 60 4000 100 (1) 40.0 1 2 pole, 20 A
4KYFA26100 Gasoline 60 4000 120 33.3 1 1 pole, 30 A
4KYFA6747* Gasoline 60 4000 120 33.3 1 1 pole, 30 A
4KYFR11429 Gasoline 60 4000 100 (2) 40.0 1 2 pole, 20 A

pdf image Specification sheet   pdf image Operator manual   pdf image Service diagram

(1) Isolated neutral, (2) Grounded neutral, (3) Adjustable 220-240, (4) Australia/New Zealand wire colors.
Ambient conditions for rated power output with muffler and RV enclosure, per ISO 8528-1:
- Temperature: 77° F (25° C)
- Altitude: 500 ft (152.4 m), (99 kPa dry)
Typical power output change based on ambient conditions:
- Temperature: Power output decreases 1% for every 10° F (5.5° C) increase
- Altitude: Power output decreases 3.5% for every 1000 ft (305 m) increase
Ratings represent minimums. Actual performance may be significantly higher based on installation and operating conditions.
* Evaporative spec: For trailer applications required to meet Tier III Evaporative Emissions of the California Air Resources Board.
Effective January 1, 2011, gasoline generator sets on trailers, diesel chassis or any other non-motorized mobile apparatus must have an EVAP generator set, approved tank, EVAP canister, hoses and fittings all meeting the CARB Tier 3 and EPA phase 3 standards and specifications. This law applies in all 50 states.


The Cummins Onan limited warranty covers virtually everything except routine maintenance for the first year that you own your generator set, or the first 1,000 hours of operation, whichever comes first. In addition, it includes a free 90-day adjustment policy, which provides that Cummins Inc. will make minor adjustments to your new generator set during the first three months you own it – free of charge!

pdf image manufacturer's limited warranty