Cummins Onan HDKCA, HDKCB, HDKCC, HDKCD RV Generator Set Complete Workshop Service Repair Manual
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Service Manual
HDKCA, HDKCB, HDKCC, HDKCD
Printed in U.S.A. 08-04 981-0540
California
Proposition 65 Warning
Diesel engine exhaust and some of its constituents are known
to the State of California to cause cancer, birth defects, and
other reproductive harm.
diesel warnings
Page 1 of 1
Supplement: 981-1049
Date: 09/04
Insert with-
Manual Number (Date): 981-0173 (08/04) 981-0174 (08/04) 981-0540 (08/04)
981-0170 (11/03) 981-0171 (11/03) 981-0526D (02/04)
981-0166B (06/03) 981-0167B (06/03) 981-0535 (10/02)
981-0161 (08/89) 981-0522B (07/99)
Purpose: These instructions supplement the instructions for filling the engine cooling system found in the
Periodic Maintenance sections of the Operator’s and Service Manuals listed above.
WARNING To prevent severe burns from hot coolant under pressure, carefully observe all of the
Safety Precautions and Instructions in the Manual for handling and filling coolant.
Instructions: Use a funnel when filling the cooling system through the fill opening (Figure 1) to prevent
coolant from entering the vent hose and blocking the escape of air as the system fills. The system will seem full
when it actually is not if the air cannot escape through the vent hose. If the vent hose does get blocked, pinch
the overflow hose and blow the vent hose clear.
CAUTION Coolant trapped in the vent hose will prevent the system from filling to its capacity, which
can lead to serious engine damage.
PRESSURE CAP
AND SYSTEM FILL
OPENING
FIGURE 1. TYPICAL COOLANT FILL OPENING WITH CONNECTED FILL, OVERFLOW AND VENT HOSES
i
Table of Contents
SECTION PAGE
SAFETY PRECAUTIONS iv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. INTRODUCTION 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About this Manual 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nameplate 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Genset 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. OPERATION 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Fuel 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Coolant 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Engine Oil 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Batteries 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Panel 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Control Panels 2-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pre-Start Checks 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Priming the Fuel System 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Starting 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Stopping 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Starting and Stopping 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading the Genset 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resetting Circuit Breakers 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to Utility Power 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating in Cold Weather 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating in Hot Weather 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating at High Altitude 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating in Dusty Environments 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Breaking In a New Engine 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exercising the Genset 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storing the Genset 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii
SECTION PAGE
3. PERIODIC MAINTENANCE 3-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Inspection 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Engine Oil Level 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing Engine Oil and Oil Filter 3-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintaining the Battery and Battery Connections 3-4 . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Air Filter Element 3-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Spark Arrestor 3-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Fuel Filter 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintaining the Coolant System 3-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. PREPARATIONS FOR SERVICE 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing / Installing Genset 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Stand 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembling / Reassembling Housing and Mounting System 4-4 . . . . . . . . . . . . .
5. FUEL SYSTEM 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Injection System 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Filter 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. AIR INTAKE SYSTEM 6-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. EXHAUST SYSTEM 7-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. ENGINE COOLING SYSTEM 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat and Pump 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radiator 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Belt 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. ENGINE AND ACCESSORIES 9-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine 9-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Sensors 9-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Charging Alternator 9-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starter Motor 9-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glow Plugs 9-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Governor Actuator 9-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High-Idle Speed 9-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iii
SECTION PAGE
10. GENERATOR 10-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generator Winding Tests 10-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generator Service 10-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting Voltage 10-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. CONTROL 11-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Board (Controller) 11-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local and Remote Control Switches 11-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hour Meter 11-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Circuit Breakers CB1, CB2 11-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relays K1, K2, K3 11-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Sense Transformer TX1 11-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12. TROUBLESHOOTING 12-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting With Table 12-1 12-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fault Code Blinking 12-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Restoring Fault Code Blinking 12-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13. BOLT TORQUES 13-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14. SPECIFICATIONS 14-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15. SERVICE CHECKLIST 15-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTROL SCHEMATIC A-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTROL WIRING HARNESS A-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC WIRING HARNESS A-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv
Safety Precautions
Thoroughly read the OPERATOR’S MANUAL
before operating the genset. Safe operation and
top performance can only be obtained when
equipment is operated and maintained proper-
ly.
The following symbols in this manual alert you to
potential hazards to the operator, service person
and equipment.
DANGER alerts you to an immediate hazard
that will result in severe personal injury or
death.
WARNING alerts you to a hazard or unsafe
practice that can result in severe personal inju-
ry or death.
CAUTION alerts you to a hazard or unsafe
practice that can result in personal injury or
equipment damage.
Electricity, fuel, exhaust, moving parts and batter-
ies present hazards which can result in severe per-
sonal injury or death.
GENERAL PRECAUTIONS
S Keep children away from the genset.
S Do not use evaporative starting fluids. They
are highly explosive.
S To prevent accidental or remote starting while
working on the genset, disconnect the nega-
tive (-) battery cable at the battery.
S Let the engine cool down before removing the
coolant pressure cap or opening the coolant
drain. Hot coolant under pressure can spray
out and cause severe burns.
S Keep the genset and its compartment clean.
Excess oil and oily rags can catch fire. Dirt and
gear stowed in the compartment can restrict
cooling air.
S Make sure all fasteners are secure and
torqued properly.
S Do not work on the genset when mentally or
physically fatigued or after consuming alcohol
or drugs.
S You must be trained and experienced to make
adjustments while the genset is running—hot,
moving or electrically live parts can cause se-
vere personal injury or death.
S Used engine oil has been identified by some
U. S. state and federal agencies as causing
cancer or reproductive toxicity. Do not ingest,
inhale, or contact used oil or its vapors.
S Ethylene glycol, used as engine antifreeze, is
toxic to humans and animals. Clean up spills
and dispose of used engine coolant in accor-
dance with local environmental regulations.
S Keep multi-class ABC fire extinguishers
handy. Class A fires involve ordinary combus-
tible materials such as wood and cloth; Class B
fires, combustible and flammable liquid fuels
and gaseous fuels; Class C fires, live electrical
equipment. (ref. NFPA No. 10)
S Genset installation and operation must comply
with all applicable local, state and federal
codes and regulations.
GENERATOR VOLTAGE IS DEADLY
S Disable the automatic genset starting feature
of an inverter-charger or other automatic start-
ing device before servicing the genset.
S Generator electrical output connections must
be made by a trained and experienced electri-
cian in accordance with applicable codes.
S The genset must not be connected to the pub-
lic utility or any other source of electrical power.
Back-feed could lead to electrocution of utility
personnel and damage to equipment. An ap-
proved switching device must be used to pre-
vent interconnections.
S Use caution when working on live electrical
equipment. Remove jewelry, make sure cloth-
ing and shoes are dry, stand on a dry wooden
platform or rubber insulating mat and use tools
with insulated handles.
v
ENGINE EXHAUST IS DEADLY
S Inspect for exhaust leaks at every startup and
after every eight hours of running.
S Learn the symptoms of carbon monoxide poi-
soning in the Operator’s Manual.
S Never sleep in the vehicle while the genset is
running unless the vehicle is equipped with a
working carbon monoxide detector.
S Do not operate the genset when the vehicle is
in a confined space, such as a garage.
S Disable the automatic genset starting feature
of an inverter-charger or other automatic start-
ing device before storing the vehicle or parking
it in a garage or other confined space.
S The exhaust system must be installed in accor-
dance with the genset Installation Manual.
S Engine cooling air must not be used for heating
working or living spaces or compartments.
DIESEL FUEL IS COMBUSTIBLE
S Do not smoke or turn electrical switches ON or
OFF where fuel fumes are present or in areas
sharing ventilation with fuel tanks or equip-
ment. Keep flames, sparks, pilot lights, arc-
producing equipment and all other sources of
ignition well away.
S Fuel lines must be secured, free of leaks and
separated or shielded from electrical wiring.
BATTERY GAS IS EXPLOSIVE
S Wear safety glasses.
S Do not smoke.
S To reduce arcing when disconnecting or recon-
necting battery cables, always disconnect the
negative (-) battery cable first and reconnect
it last.
MOVING PARTS CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH
S Disable the automatic genset starting feature
of an inverter-charger or other automatic start-
ing device before servicing the genset.
S Do not wear loose clothing or jewelry near
moving parts such as PTO shafts, fans, belts
and pulleys.
S Keep hands away from moving parts.
S Keep guards in place over fans, belts, pulleys,
and other moving parts.
FLAMMABLE VAPOR CAN CAUSE A
DIESEL ENGINE TO OVERSPEED
Flammable vapor can cause a diesel engine to
overspeed and become difficult to stop, resulting in
possible fire, explosion, severe personal injury and
death. Do not operate a diesel-powered genset
where a flammable vapor environment can be
created by fuel spill, leak, etc. The owners and
operators of the genset are solely responsible for
operating the genset safely.
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This complete workshop service repair manual for the Cummins Onan HDKCA, HDKCB, HDKCC, HDKCD RV Generator Set is an essential resource for both professional mechanics and DIY enthusiasts.
The manual covers every service and repair procedure with easy-to-follow step-by-step instructions and pictures, allowing you to save money by doing your own repairs.
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