Thoroughly read the Operator Manual before operating the generator set. It contains important instructions
that should be followed during operation and maintenance. Safe operation and top performance can only
be achieved when equipment is properly operated and maintained. The owners and operators of the
generator set are solely responsible for its safe operation.
Generator set operation, maintenance, and installation must comply with all applicable local, state, and
federal codes and regulations. Electricity, fuel, exhaust, moving parts, and batteries present hazards which
can result in severe personal injury or death. Only trained and experienced personnel with knowledge of
fuels, electricity, and machinery hazards should perform generator set installation or adjustment
procedures; or remove, dismantle, or dispose of the generator set.
1.2Warning, Caution, and Note Styles Used in This
Manual
The following safety styles and symbols found throughout this manual indicate potentially hazardous
conditions to the operator, service personnel, or equipment.
DANGER
Indicates a hazardous situation that, if not avoided, will result in death or serious injury.
WARNING
Indicates a hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION
Indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.
NOTICE
Indicates information considered important, but not hazard-related (e.g., messages relating to
property damage).
1.3General Safety Precautions
WARNING
Operation of equipment is unsafe when mentally or physically fatigued. Do not operate
equipment in this condition, or after consuming any alcohol or drug.
Maintaining or installing a generator set can cause severe personal injury. Wear personal
protective equipment such as safety glasses, protective gloves, hard hats, steel-toed boots, and
protective clothing when working on equipment.
WARNING
Running the generator set without the cover or service door can cause severe personal injury or
equipment damage. Do not operate the generator set with the cover or service doors removed.
WARNING
Starting fluids, such as ether, can cause explosion and generator set engine damage. Do not use.
WARNING
Benzene, found in some fuels, has been identified by some state and federal agencies to cause
cancer or reproductive toxicity. Do not ingest, breathe the fumes, or contact gasoline when
checking, draining, or adding gasoline.
WARNING
Used engine oils have been identified by some state and federal agencies to cause cancer or
reproductive toxicity. Do not ingest, breathe the fumes, or contact used oil when checking or
changing engine oil.
CAUTION
To prevent accidental or remote starting while working on the generator set, disconnect the
negative (-) battery cable at the battery using an insulated wrench.
CAUTION
Unsecured or loose fasteners can cause equipment damage. Make sure all fasteners are secure
and properly torqued.
CAUTION
Oily rags and other material can cause fire and restrict cooling. Keep the generator set, drip pan,
and compartment clean.
CAUTION
Accumulated grease and oil can cause overheating and engine damage presenting a potential
fire hazard. Keep the generator set clean and repair any oil leaks promptly.
NOTICE
Keep multi-class ABC fire extinguishers handy. Class A fires involve ordinary combustible
materials such as wood and cloth. Class B fires involve combustible and flammable liquid fuels
and gaseous fuels. Class C fires involve live electrical equipment. (Refer to NFPA No. 10 in
applicable region.)
Accidental starting can cause severe personal injury or death. Turn off the AGS whenever
performing maintenance or service, when the vehicle is stored between uses, is awaiting service,
or is parked in a garage or other confined area.
Unexpected starting may occur if the generator set is equipped with an inverter-charger or other Automatic
Generator Start (AGS) control. This may cause exposure to:
• Unexpected generator starting
• Moving parts hazards
• Electric shock
• Exhaust carbon monoxide (CO)
1.5Electrical Shock and Arc Flash Can Cause Severe
Personal Injury or Death
WARNING
Electrical shocks and arc flashes can cause severe personal injury or death. Adhere to the
following guidelines:
• Only qualified service personnel certified and authorized to work on power circuits should
work on exposed energized power circuits.
• All relevant service material must be available for any electrical work performed by certified
service personnel.
• Exposure to energized power circuits with potentials of 50 VAC or 75 VDC or higher poses a
significant risk of electrical shock and electrical arc flash.
• Refer to standard NFPA 70E, or equivalent safety standards in corresponding regions, for
details of the dangers involved and for safety requirements.
1.6Generator Voltage Is Deadly
WARNING
Improperly connected generator electrical output connections can cause equipment damage,
severe personal injury, or death. Electrical connections must be made by a trained and
experienced electrician in accordance with applicable codes.
WARNING
Improper installations can cause equipment damage, severe personal injury, or death. All
installations must be conducted by trained and experienced personnel in accordance with the
installation instructions and all applicable codes.
Back feed to shore power can cause electrocution and damage to equipment. The generator set
must not be connected to shore power or to any other source of electrical power. An approved
switching device must be used to prevent interconnections.
WARNING
Live electrical equipment can cause electrocution. Use caution when working on live electrical
equipment. Remove jewelry, make sure clothing and shoes are dry, stand on a dry wooden
platform or rubber insulating mat, and use tools with insulated handles.
1.7Engine Exhaust/Carbon Monoxide Is Deadly
WARNING
Substances in exhaust gases have been identified by some state and federal agencies to cause
cancer or reproductive toxicity. Do not breathe in or come into contact with exhaust gases.
WARNING
Carbon monoxide is a poisonous gas. Inhalation of this gas can cause severe personal injury or
death. Adhere to the following bullet points to make sure carbon monoxide is not being inhaled
by occupants of the vehicle as well as others working on or around the generator set.
• Inspect for exhaust leaks, and test and confirm that all carbon monoxide detectors are
working in accordance with the manufacturer's instructions or owner's manual, prior to
every startup, and after every 8 hours of running.
• Never occupy the vehicle while the generator set is running unless the vehicle is equipped
with a working carbon monoxide detector.
• Never operate the generator set when the vehicle is in a confined space, such as a garage,
basement, or building of any kind.
• Make sure the exhaust system is installed in accordance with the generator set installation
manual.
• Never use engine cooling air for heating a working or living space compartment.
Carbon Monoxide (CO) is odorless, colorless, tasteless, and non-irritating. It cannot be seen or smelled.
Exposure, even to low levels of CO for a prolonged period can lead to asphyxiation (lack of oxygen).
Fuel and fuel vapor is highly explosive. Adhere to the following bullets to avoid igniting fuel and
fuel vapors.
• Do not smoke or turn electrical switches on or off where fuel fumes are present or in areas
sharing ventilation with fuel tanks or equipment.
• Keep flame, sparks, pilot lights, arc-producing equipment and all other sources of ignition
well away from fuel lines and sources.
• Fuel lines must be secured, free of leaks, and separated or shielded from electrical wiring.
Leaks can lead to explosive accumulations of gas.
• LPG sinks when released and can accumulate inside housings and basements and other belowgrade spaces.
NOTICE
Natural gas is identifiable by a rotten egg smell.
1. Important Safety Instructions7-2016
1.9Battery Gas Is Explosive
WARNING
Battery gas is highly explosive and may cause personal injury or death if ignited. Take the proper
precautions to avoid personal injury.
• For personal safety, wear appropriate PPE when working on or around the generator set.
• To make sure battery gas is not ignited, do not smoke around the generator set.
• To reduce arcing when disconnecting or reconnecting battery cables, always disconnect
the negative (–) battery cable first and reconnect it last.
1.10Moving Parts Can Cause Severe Personal Injury or
Death
WARNING
Moving parts can cause severe personal injury or death, and hot exhaust parts can cause severe
burns. Make sure all protective guards are properly in place before starting the generator set.
WARNING
Hot moving, and electrically live parts can cause severe personal injury or death. Keep children
away from the generator set.
Hot, moving, and electrically live parts can cause severe personal injury or death. Only trained
and experienced personnel should make adjustments while the generator set is running.
WARNING
Moving parts can catch on loose items such as clothing or jewelry. Do not wear loose clothing or
jewelry near moving parts such as PTO (power take-off) shafts, fans, belts, and pulleys.
WARNING
Moving parts can entangle appendages such as fingers. Keep the protective guards in place over
fans, belts, pulleys, and other moving parts and keep hands away from all moving parts.
1.11CARB
CAUTION
Unauthorized modifications or replacement of fuel, exhaust, air intake, or speed control system
components that affect engine emissions are prohibited by law in the state of California.
The California Air Resources Board (CARB) has requirements regarding modification & repair of fuel
system & exhaust components including, but not limited to, adherence to evaporative emissions
requirements in mobile installations. Evaporative generator sets must be used in trailers, fifth wheel
trailers, and other non-motorized vehicles where on-board gasoline fuel storage is self-contained in the
trailer equipment. Completing the installation of the generator set fuel evaporative system provides
compliance with the California code of regulations for small off-road equipment effective January 1, 2008
and Federal Small SI regulation effective January 1, 2011. Any questions regarding the installation or
evaporative emission certification should be directed to Cummins Power Generation for clarification.
1.12Generator Set Warning Labels
Warning signs are provided on the generator set at or near the point of risk. To avoid injury, always take
the necessary precautions as indicated on the sample signs shown below.
Caution or Warning.
Indicates a risk of personal injury.
Caution or Warning of Temperature Hazard.
Indicates a risk of personal injury from high temperature.
Caution or Warning of High Voltage Hazard.
Indicates a risk of personal injury from electric
shock or electrocution.
This is the Operator Manual for the generator set or sets listed on the front cover. Each operator should
study this manual carefully and observe all of its instructions and safety precautions. Keep this manual
readily available for reference.
The information contained within the manual is based on information available at the time of printing. In
line with Cummins Power Generation policy of continuous development and improvement, information
may change at any time without notice. The users should therefore make sure that before commencing
any work, they have the latest information available. The latest version of this manual is available on
QuickServe Online (https://quickserve.cummins.com).
The Operation, Maintenance, and Troubleshooting Chapters of this manual provide instructions necessary
for operating the generator set and maintaining it at top performance. The owner is responsible for
performing maintenance in accordance with the information provided in Chapter 5 on page 33.
This manual also includes generator set specifications and information on how to obtain service,
emissions regulation compliance, and model identification.
See the Parts Manual for part identification numbers and required quantities. Genuine Cummins Onan
replacement parts are recommended for best results.
2.2Related Literature
Before any attempt is made to operate the generator set, the operator should take time to read all of the
manuals supplied with the generator set, and to familiarize themselves with the warnings and operating
procedures.
CAUTION
A generator set must be operated and maintained properly if you are to expect safe and reliable
operation. The Operator manual includes a maintenance schedule and a troubleshooting guide.
The Health and Safety manual must be read in conjunction with this manual for the safe
operation of the generator set:
• Health and Safety Manual (0908-0110)
The relevant manuals appropriate to your generator set are also available, the documents below are in
English:
• Operator Manual for RV Generator Set HGJAA (Spec J-K) and HGJAB (Spec J-L) (A035D009)
• Installation Manual for RV Generator Set HGJAA (Spec J-K) and HGJAB (Spec J-L) (A035D005)
• Generator Set Service Manual for RV Generator Set HGJAA (Spec J) and HGJAB (Spec J-K)
(A035D011)
• Recommended Spares List (RSL) for RV Generator Set HGJAA (Spec J-K) and HGJAB (Spec J-L)
(A041X685)
• Parts Manual for RV Generator Set HGJAA (Spec J-K) and HGJAB (Spec J-L) (0983-0201)
Each generator set is provided with a nameplate that contains the model and serial numbers. This
information is needed when contacting Cummins Onan for parts, service, and product information.
Every character of the model number is significant. The last character of the model number is the
specification letter which is important for obtaining the correct parts.
Record the generator set model and serial numbers in the figure below to have them available if needed.
2.3.1Nameplate Location
FIGURE 1. NAMEPLATE LOCATION
2.4How to Obtain Service
For generator set parts, service, and literature, contact the nearest authorized Cummins Onan distributor.
You may go to the Internet site www.power.cummins.com for information on contacting our distributors
worldwide.
2.4.1In North America
Call +1 800 8886626 for the nearest Cummins Onan distributor in the United States or Canada. Press 1
(option 1) to be automatically connected.
If you are unable to contact a distributor using the automated service, consult the Yellow Pages. Typically,
our distributors are listed under: generators - electric.
Generator sets emit and receive electromagnetic (radio frequency) energy. If the generator set affects
operation of nearby devices, or nearby devices affect generator set operation, increase the distance
between them.
When used in countries where compliance to the EMC directive is required: This generator set has been
evaluated for use in the residential, commercial, and light industrial environments.
3.2Information for Generator Set Users (Spark-Ignited
Exhaust Emissions)
This generator set meets the requirements of exhaust emissions standards for 50-state operation as
stated on the nameplate.
As a user of this generator set, please be aware that unauthorized modifications or replacement of fuel,
exhaust, air intake, or speed control system components that affect engine emissions are prohibited.
Unauthorized modification, removal, or replacement of the generator set label is prohibited.
Carefully review Operator (Owner), Installation, and other manuals and information you receive with the
generator set. If unsure that the installation, use, maintenance, or service of the generator set is
authorized, seek assistance from an approved Cummins Onan dealer.
Generator set users may use the following table as an aid in locating information related to the
requirements for emissions control.
TABLE 1. EMISSIONS CONTROL INFORMATION
The EPA (Part Number A034R654) and California (Part Number
Generator Set Warranty Information
Engine Valve LashSee Section 3.4 on page 15.
Engine Ignition TimingSee Section 3.4 on page 15.
Engine Fuel Requirements
Engine Lubricating Oil RequirementsSee Section 5.5 on page 35 for engine oil recommendations.
Engine Fuel Mixture Settings
Engine AdjustmentsNone.
Engine Emission Control System
A034R656) emissions control warranty statements are located in the
same packet of information as this manual when the generator set is
shipped from the factory.
Gasoline Models: The engine is certified to operate on unleaded
gasoline.
LPG Models: The engine is certified to operate on LPG.
See Section 5.6 on page 38 for fuel recommendations.
The generator set engines have precision-manufactured carburetors
which are not adjustable.
The engine emission control system consists of inherent engine design
and, in some cases, an exhaust after-treatment system incorporating a
three-way catalyst and pulse secondary air injection.
The generator set and its control system have been designed, constructed and tested generally in
accordance with the following Standards where applicable.
StandardTitle
BS EN 1037:1995+a1:2008Safety of machinery - Prevention of unexpected start up.
BS EN ISO 14121-1:2007Safety of machinery. Risk assessment principles.
BS EN ISO 13857:2008Safety of machinery. Safety distances to prevent hazard zones being
reached by upper and lower limbs.
BS EN 349:1993+A1:2008Safety of machinery - Minimum gaps to avoid crushing parts on the human
body.
BS EN 547-1:1996+A1:2008Safety of machinery - Human body dimensions - Part 1: Principles for
determining the dimensions required for openings for whole body access
into machinery.
BS EN 547-2:1996+A1:2008Safety of machinery - Human body dimensions - Part 2: Principles for
determining the dimensions required for access openings.
BS EN 547-3:1996+A1:2008Safety of machinery - Human body dimensions - Part 3: Anthropomorphic
data.
BS EN 60204-1:2006+A1:2009Safety of machinery. Electrical equipment of machines. General
requirements.
BS EN 614-1:2006+A1:2009Safety of machinery. Ergonomic design principles. Terminology and
general principles.
BS EN 953:1997+A1:2009Safety of machinery - Guards - General requirements for the design and
construction of fixed and movable guards.
BS EN ISO 12100-1:2003+A1:2009Safety of machinery. Basic concepts, general principles for design. Basic
terminology, methodology
BS EN ISO 12100-2:2003+A1:2009Safety of machinery. Basic concepts, general principles for design.
Technical principles
BS EN ISO 13732-1:2008Ergonomics of the thermal environment. Methods for the assessment of
human responses to contact with surfaces. Hot surfaces
BS EN ISO 13849-1:2008Safety of machinery - Safety-related parts of control systems
BS EN ISO 13850:2006Safety of machinery - Emergency stop. Principles for design.
BS EN 61310-1:2008Safety of machinery - Indication, marking and actuation - Part 1:
Requirements for visual, auditory and tactile signals.
BS EN 61310-2:2008Safety of machinery - Indication, marking and actuation - Part 2:
Requirements for marking.
BS EN 61000-6-1:2007Electromagnetic compatibility (EMC). Generic standards. Immunity
standard for residential, commercial and light-industrial environments.
BS EN 61000-6-3:2007Electromagnetic compatibility (EMC). Generic standards. Emission
standard for residential, commercial and light-industrial environments.
BS EN 1299:1997+A1:2008Mechanical vibration and shock - Vibration isolation of machines -
Information for the application of source isolation