Page 1
Printed in U.S.A. 981−0151B
Page 2
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.
Page 3
Safety Precautions
SAFETY PRECAUTIONS iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About this Manual 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Identification 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Feature and Component Locations 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTROLS AND CIRCUIT BREAKERS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote (Detachable) Control Panel 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set-Mounted Controls and Breakers 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Control/Meter Panel 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRE-START CHECKS 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Check 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Raw Water Pump Priming 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Inspection 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STARTING AND STOPPING 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stopping 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WATTAGE REQUIREMENTS 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Wattage Capacity 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Power 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATING RECOMMENDATIONS 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Break-In Procedure 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No-Load Operation 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exercise Period 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
i
Page 4
MAINTENANCE SCHEDULE 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE PROCEDURES 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Generator Set Inspection 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil and Filter Change 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling System 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel System 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Care 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Generator 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERATOR SET STORAGE 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Out-of-Service Protection 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Control 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Control 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HOW TO OBTAIN SERVICE 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locating Service Assistance 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scheduling Service 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE RECORD 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INFORMATION FOR CALIFORNIA GENSET USERS 29. . . . . . . . . . . . . . . .
ii
Page 5
Safety Precautions
Thoroughly read the OPERATOR’S MANUAL
before operating the genset. Safe operation and
top performance can only be attained when
equipment is operated and maintained properly.
The following symbols in this manual alert you to
potential hazards to operators, service personnel
and equipment.
alerts you to an immediate hazard
which will result in severe personal injury or
death.
alerts you to a hazard or unsafe
practice which can result in severe personal
injury or death.
alerts you to a hazard or unsafe
practice which can result in personal injury or
equipment damage.
Electricity, fuel, exhaust, hot engine coolant, moving parts and batteries present hazards which can
result in severe personal injury or death.
• Make sure all fasteners are secure and properly torqued.
• Do not work on the genset when mentally or
physically fatigued or after having consumed
alcohol or drugs.
• You must be trained and experienced to make
adjustments while the genset is running—hot,
moving or electrically live parts can cause severe personal injury or death.
• 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.
• Ethylene glycol, used as engine antifreeze, is
toxic to humans and animals. Clean up spills
and dispose of used engine coolant in accordance with local environmental regulations.
• Keep multi-class ABC fire extinguishers handy.
Class A fires involve ordinary combustible 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)
GENERAL PRECAUTIONS
• Keep children away from the genset.
• Do not step on the genset when entering or
leaving the generator room. Parts can bend or
break leading to electrical shorts or to fuel,
coolant or exhaust leaks.
• To prevent accidental or remote starting while
working on the genset, disconnect the negative (- ) battery cable at the battery.
• Let the engine cool down before removing the
coolant pressure cap or opening the coolant
drain. Hot coolant under pressure can spray
and cause severe burns.
• Do not use evaporative starting fluids. They are
highly explosive.
• Keep the genset, drip pan and compartment
clean. Oily rags can catch fire. Gear stowed in
the compartment can restrict cooling.
• Genset installation and operation must comply
with all applicable local, state and federal
codes and regulations.
GENERATOR VOLTAGE IS DEADLY
• Generator electrical output connections must
be made by a trained and experienced electrician in accordance with applicable codes.
• The genset must not be connected to shore
power or to any other source of electrical
power. Back-feed to shore power can cause
electric shock resulting in severe personal injury or death and damage to equipment. An approved switching device must be used to prevent interconnections.
• 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.
iii
Page 6
ENGINE EXHAUST IS DEADLY
BATTERY GAS IS EXPLOSIVE
• Never sleep in the boat while the genset is running unless the boat is equipped with properly
working carbon monoxide detectors.
• The exhaust system must be installed in accordance with the genset Installation Manual and
be free of leaks.
• Make sure the bilge is adequately ventilated
with a power exhauster.
• Inspect for exhaust leaks every startup and
after every eight hours of operation.
• For more information about carbon monoxide
see American Boat and Yacht Council (ABYC)
publication TH-22—
Educational Information
About Carbon Monoxide.
DIESEL FUEL IS COMBUSTIBLE
• 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 flames, sparks, pilot lights, arcproducing equipment and all other sources of
ignition well away.
• Fuel lines must be secured, free of leaks and
separated or shielded from electrical wiring.
• Wear safety glasses while servicing batteries
and do not smoke.
• To reduce arcing when disconnecting or reconnecting battery cables, always disconnect the
negative (- ) battery cable first and reconnect it
last.
MOVING PARTS CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH
• Do not wear loose clothing or jewelry near moving parts such as PTO shafts, fans, belts and
pulleys.
• Keep hands away from moving parts.
• Keep guards in place over fans, belts, pulleys,
and other moving parts.
FLAMMABLE vapor environment
Flammable vapor can cause a diesel engine to
overspeed and become difficult to stop, resulting in
possible fire, explosion, severe personal injury or
death.
in a flammable vapor environment created by
fuel spill, leak, etc.
the genset are solely responsible for operating the
genset safely.
Do not operate a diesel-powered genset
The owners and operators of
POST THESE SUGGESTIONS IN POTENTIAL HAZARD AREAS OF THE BOAT
M-10
iv
Page 7
Introduction
ABOUT THIS MANUAL
This manual shows how to operate and maintain
the Onan
Study the manual and heed all warnings and cautions. Using the genset properly and maintaining it
regularly will promote longer set life, better performance, and safer operation.
The
the break-in procedure and the effects of high altitude and variations in climate. The
quirements
of the set and lists the wattage use of common appliances and tools. Familiarize yourself and others
who will operate this set with this information.
Information for California Genset Users
important information for California genset users.
Onan is a registered trademark of Onan Corporation.
MDKUB and MDKWB generator sets.
Operating Recommendations
section covers
Wattage Re-
section describes the wattage capacity
provides
MODEL IDENTIFICATION
Have the following information ready when you call
a distributor:
•Model number
•Serial number
These are found on the nameplate (Figure 1), which
is located on the inner side of the generator control
box.
Record these numbers from your generator set in
the area provided in Figure 1. Make sure that all
numbers are recorded correctly.
FEATURE AND COMPONENT LOCATIONS
The standard control panel and the routine maintenance items are shown in Figure 2.
NAMEPLATE LOCATED ON
INNER SIDE OF CONTROL BOX
9.0MDKWB/60507D
A953123456
SKB719U6D2RA 719 cc
RECORD COMPLETE
MODEL AND SERIAL
NUMBER HERE
FIGURE 1. MODEL IDENTIFICATION
MODEL NUMBER
SERIAL NUMBER
1
Page 8
COMBUSTION
AIR INLET
GENERATOR
COOLING AIR INLET
GENERATOR
COOLING AIR
OUTLET
FRONT
HOUSING
DOOR
SPRING
CATCHES
REAR
HOUSING
DOOR
WET EXHAUST
TUBE
START/STOP/
DC CONTROL
BREAKER
FIELD
BREAKER
AC MAIN
BREAKER
OUTPUT
VOLTAGE
ADJUST
START
SOLENOID
AIR INTAKE
MUFFLER
GROUNDING
STRAP
PREHEAT
SWITCH
START/STOP/PREHEAT SWITCH (ON
RUNNING TIME
METER
PLYWOOD
MOUNTING BASE
REMOTE−MOUNTABLE PANEL)
FUEL
RETURN
FUEL PUMP
FUEL IN
RAW WATER
INLET
OIL LEVEL
GAUGE
OIL FILL
BATTERY
NEGATIVE (−)
OIL FILTER
OIL DRAIN
DRIP PAN
NOTE: BATTERY
POSITIVE (+) IS
CONNECTED TO
STARTER ON
OPPOSITE SIDE
OF SET
FIGURE 2. GENERATOR SET COMPONENT LOCATIONS (MDKUB SHOWN)
2
Page 9
Controls and Circuit Breakers
The set controls and circuit breakers are located on
the front of the generator set, behind the front housing panel. See Figure 4.
The genset control panel is held on the set by two
screws. This panel may be removed, unplugged
and remounted anywhere on the vessel with the aid
of a remote wiring harness. A blanking plate is used
to cover the opening in the control box. See the Installation Manual, publication 981-0602.
Remote (Detachable) Control Panel
Start/Stop/Preheat Switch:
generator set. Operates the engine cylinder
preheaters.
Running Time Meter:
number of hours the generator set runs.
START−STOP−PREHEAT
SWITCH (SET−MOUNTED)
Starts and stops the
A meter that displays the
Set-Mounted Controls and Breakers
Start/Stop/Preheat Switch:
generator set. Operates the engine cylinder
preheaters.
Voltage Adjustment Pot:
used to ad j u s t t he set o u t put vo l t age (qualified technicians only).
Field Breaker:
A breaker which trips when the gen-
erator field overloads.
DC Control Breaker:
A 15 ampere DC breaker that
protects the control box and remote wiring from
short circuits or overload. Also serves as an emergency stop switch.
Line Circuit Breaker:
protects the set from a short circuit or other overload. It i s mounted on the side of the AC control box.
CONTROL PANEL
Starts and stops the
A potentiometer that is
A dual circuit breaker that
DETACHABLE
DC CONTROL BREAKER
(SET−MOUNTED)
LINE CIRCUIT
BREAKER
FIELD CIRCUIT
BREAKER
RUNNING
TIME METER
HOLD−DOWN
SCREWS
START/STOP/PREHEAT
SWITCH
VOLTAGE ADJUSTMENT
POTENTIOMETER
FIGURE 3. REMOTE CONTROL PANEL
3
Page 10
Optional Control/Meter Panel
An optional control panel includes a start/stop/preheat switch, running time meter, and gauges that
monitor oil pressure, coolant temperature, and DC
battery voltage. The Starting and Stopping section
of this manual describes these meters and what
they should show during set operation.
RUNNING
TIME METER
OIL PRESSURE
METER
COOLANT
TEMPERATURE
METER
DC
VOLTAGE
METER
START/STOP/
PREHEAT
SWITCH
SC−1600−2s
FIGURE 4. OPTIONAL CONTROL PANEL (W/METERS)
4
Page 11
Pre−Start Checks
GENERAL
Read through this entire section before attempting
to start the genset. It is essential for safe operation
that the operator be completely familiar with the set.
ENGINE OIL
Check the engine oil level before each start. When
the generator set is new, the engine must be filled
with oil before the initial start.
• MDKUB oil capacity: 3.78 liters (4 quarts)
• MDKWB oil capacity: 4.73 liters (5 quarts)
If adding oil between changes, use the same brand
because different brands might not be compatible
when mixed. Be careful not to overfill the crankcase
because the oil will foam, resulting in engine shutdown.
Oil Recommendations
Use premium quality motor oil. Look for the API
(American Petroleum Institute) classification and
use Class CD or better oil (CD, CE). Also look for the
SAE (Society of Automotive Engineers) viscosity
grade. Referring to Table 1, choose the viscosity
grade appropriate for the ambient temperatures ex-
pected during the period of time until the next
scheduled oil change.
Checking Engine Oil Level
CAUTION
oil below the ADD mark or above the FULL mark.
Overfilling can cause foaming or aeration of the
oil, while operation below the ADD mark might
cause loss of oil pressure.
Check the engine oil level at the intervals shown in
Table 2, later in this manual. The oil dipstick and fill
are located on the side of the engine (see Figure 5).
The dipstick is stamped with FULL and ADD to indicate the oil level in the crankcase. For an accurate
reading, shut off the engine and wait 10 minutes before checking the level. This lets oil in the upper part
of the engine drain into the crankcase.
Keep the oil level near as possible to the FULL mark
on the dipstick. Remove the oil fill cap and add the
same type of oil when necessary.
CAUTION
oil level below the ADD mark or above the FULL
mark. Overfilling can cause foaming or aeration
of the oil, while operation below the ADD mark
can cause loss of oil pressure.
Do not operate the engine with the
Do not operate the engine with the
TABLE 1. OIL VISCOSITY VS. TEMPERATURE
Anticipated Ambient Temperature
5
Page 12
OIL DIPSTICK
COOLANT
The coolant level should be near the fill mark on the
coolant overflow bottle fill cap. Do not check while
the coolant is hot.
FIGURE 5. ENGINE OIL
OIL
FILL
OIL
FILTER
OIL
DRAIN
VALVE
WARNING
The sudden release of hot pressurized coolant can result in serious personal injury. Remove the expansion tank pressure cap
slowly after the engine has cooled.
EXHAUST
Thoroughly inspect the exhaust system for leaks or
corrosion. Have any problems repaired before operating the generator set.
WARNING
severe personal injury or death. Make certain
that all exhaust components are operational
and that there are no exhaust leaks.
Exhaust gas presents the hazard of
6
Page 13
FUEL CHECK
Carefully inspect the fuel system for leaks or corrosion. Have any problems repaired immediately.
WARNING
explosion which can cause severe personal injury or d eath. Do no t permit any flame, spark, pilot light, cigarette, or other ignition source near
the fuel system.
Use the best fuel available. Fuel quality is important
for dependable performance and satisfactory engine life. Regularly check the fuel filter according to
the Maintenance Schedule in this manual. Replace
if necessary.
WARNING
personal injury or death by fire or explosion. Do
not permit any flame, cigarette, pilot light, spark
or other igniter near the fuel system.
Fuel presents the hazard of fire or
Ignition of fuel can cause serious
32
° F (0° C), and during long periods of light engine
load.
Use low sulfur content fuel which has a cloud point
at least 10 degrees below the lowest expected fuel
temperature. (Cloud point is the temperature at
which wax crystals begin to form in diesel fuel.)
RAW WATER PUMP PRIMING
Before beginning operation (initial start-up), the raw
(sea) water pump should be primed. The priming
water provides an impeller surface lubricant until
flotation water is pulled into the pump.
To prime the pump, close the sea cock and remove
the hose from the water filter outlet. Fill the hose
and pump with clean water. Replace the hose and
open the sea cock. Check pump operation on startup by observing water discharge from the exhaust
outlet.
Fuel Recommendation
Use ASTM 2-D (No. 2 Diesel) or ASTM 1-D (No. 1
Diesel) fuel with a minimum Cetane number of 45.
Number 2 diesel fuel gives the best economy and
performance under most conditions. Use number 1
diesel fuel when ambient temperatures are below
GENERAL INSPECTION
Check the generator set for damaged or loose
parts. Make sure the air inlet and outlet areas are
not blocked. Investigate any abnormal operating
noises. Make sure that the generator set is securely
mounted.
7
Page 14
Starting and Stopping
EXHAUST GAS IS DEADLY!
Exhaust gases contain carbon monoxide, an odorless and colorless gas.
Carbon monoxide is poisonous and can cause unconsciousness and
death. Symptoms of carbon monoxide poisoning can include:
•
Dizziness
•
Nausea
•
Headache
•
Weakness and Sleepiness
IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS,
GET OUT INTO THE FRESH AIR IMMEDIATEL Y. If symptoms persist, seek
medical attention. Shut down the unit and do not operate until it has been
inspected and repaired.
Never sleep in the vessel with the generator set running unless the vessel
interior is equipped with an operating carbon monoxide detector. Protection against carbon monoxide inhalation also includes proper exhaust
system installation and visual and audible inspection of the complete ex haust system at the start of each generator set operation.
•
Throbbing in Temples
•
Muscular Twitching
•
Vomiting
•
Inability to Think Coherently
STARTING
Starting at Set
1. Hold the starting switch to the STOP/PREHEAT
position for 10 to 30 seconds, depending on the
temperature (see Table 2).
CAUTION
onds may damage glow plugs.
TABLE 2. PREHEAT TIME vs. TEMPERATURE
Ambient Temperature Preheat Time
Above 86° F (30° C)
Between 50° to 86° F
(10° to 30° C)
Between 32° to 50° F
(0° to 10° C)
Below 32° F (0° C)
2. Release the switch, then move it to the START
position. The starter will crank and after a few
seconds the engine should start. The starter
Preheat time longer than 30 sec-
10 seconds
15 seconds
20 seconds
30 seconds
will automatically disconnect when the generator AC voltage builds up.
3. If the engine does not start after cranking 30
seconds, release the switch. Wait two minutes,
then repeat Step 1 (preheat).
CAUTION
heat the starter, damaging it. Do not engage
the starter longer than 30 seconds without
allowing two minutes for cooling.
4. If the engine does not start on the second try:
Excessive cranking can over-
•Check the fuel supply.
•Make sure the fuel system has been primed.
With an empty tank, the fuel system may need
priming before the set can start. See
tem
in the
Maintenance
Section.
Fuel Sys-
Starting at Remote Panel
The same procedures and cautions for normal
starting apply to remote starting.
8
Page 15
Starting at Remote (Meter) Panel
STOPPING
If the optional remote panel with meters has been
installed, monitor the oil pressure, water temperature, and set DC voltage while the set is being
started, and after it has run for roughly a minute.
Note the following:
•
Oil Pressure Gauge:
be in the range of 28 to 64 psi (294 to 543 kPa)
when the engine is at operating temperature.
•
Coolant Temperature Gauge:
temperature should be in the range of 165
° F (74° to 91° C) depending on the load
195
and ambient temperature.
•
DC Voltmeter:
be 12.5 to 15 volts. Actual voltage depends on
the battery state-of-charge and condition.
Normal battery voltage should
The oil pressure should
The coolant
° to
Before Stopping
Run the genset at no load three to five minutes before stopping. This lets the lubricating oil and engine coolant carry heat away from the combustion
chamber and bearings.
CAUTION
gine cooling without load can cause engine
damage. Make sure the generator set runs unloaded at least three minutes.
To Stop:
until the engine stops.
Failure to allow running time for en-
Push the switch to STOP, and hold it there
9
Page 16
Wattage Requirements
AC WATTAGE CAPACITY
The AC power output from the generator will power
appliances and other equipment. (The wattage requirement of appliances and electrical equipment
may be referred to as “electrical load”.)
AC line circuit breakers mounted on the set protect
the generator from an overloaded output, which occurs when too much load is applied at once, or if
there is a short circuit in the system.
Connecting a Load
To determine the maximum amount of electrical
load that can be applied, follow these steps:
1. Determine the maximum load (wattage) supplied by the genset/vehicle circuit, by multiplying the circuit breaker size by the AC output
voltage:
2 x 45 (amps) x 120 (volts) = 10800 watts
or
2 x 22.5 (amps) x 240 (volts) = 10800 watts
2. Check the wattage requirement of each appliance to be connected (see Table 3). The appliance nameplate should list the wattage of each
item.
3. Add the wattages of all the items to be powered
at the same time. Make sure that the total wattage does not exceed the limit of the circuit
breaker.
Example:
Air Conditioner 1800 watts
Converter 500 watts
Coffee Percolator 600 watts
Television 300 watts
Total 3200 watts
4. Start the generator set and let it warm up a few
minutes before applying electrical load.
Make sure that each appliance and tool is properly
grounded and in good working condition before using it.
WARNING
Electrical shock can cause severe
personal injury or death. Appliances should be
in good working condition and be properly
grounded to provide additional protection from
electrical shock.
TABLE 2. APPROXIMATE POWER DRAW OF
COMMON APPLIANCES
Appliance or Tool Approximate
Running W attage
Air Conditioner 1400-2000. . . . . . . . . . . . . . .
Battery Charger Up to 800. . . . . . . . . . . . . .
Coffee Percolator 550-750. . . . . . . . . . . .
Converter 300-500. . . . . . . . . . . . . . . . . . .
Electric Blanket 50-200. . . . . . . . . . . . . .
Electric Broom 200-500. . . . . . . . . . . . . . .
Electric Drill 250-750. . . . . . . . . . . . . . . . .
Electric Frying Pan or Wok 1000-1500. . . .
Electric Iron 500-1200. . . . . . . . . . . . . . . . .
Electric Stove (Per Element) 350-1000. . .
Electric Water Heater 1000-1500. . . . . . . . .
Hair Dryer 800-1500. . . . . . . . . . . . . . . . . . .
Microwave Oven 1000-1500. . . . . . . . . . . . .
Radio 50-200. . . . . . . . . . . . . . . . . . . . . . .
Refrigerator 600-1000. . . . . . . . . . . . . . . . .
Space Heater 1000-1500. . . . . . . . . . . . . . . .
Television 200-600. . . . . . . . . . . . . . . . . . .
Motorized Appliances
Motorized appliances consume more power during
startup than they do when running at normal speed.
(Some motors draw as much as three times their
operating power during startup.) If you plan to use a
motorized appliance, turn it o n before starting other
appliances. When the motor is running at normal
speed, more appliances may be added.
Circuit Breakers
Circuit breakers on the electrical distribution panel
or on the genset will open if their current ratings are
exceeded. This may be caused either by running
too many appliances at once, or by a short circuit.
The genset will continue to run after a breaker trips.
Turn off all appliances and other loads, then reset
10
Page 17
the breaker. If it trips again, a short circuit is indicated. T urn off the set and contact a qualified technician for assistance.
If the breaker does not trip, turn on only as many appliances as the breaker size allows (see
ing A Load
a defective appliance or circuit breaker is indicated.
in this section). If the breaker trips again,
Connect-
Connection to Utility Power
tion 981-0601) for information on isolating the genset from utility-supplied power.
WARNING
Connecting the generator set directly to the public utility or any other power
system can cause electrocution, damage to
equipment, or fire. Hazardous voltages can
flow from the generator set into the utility line.
An approved switching device must be used to
prevent interconnections.
Connect the RV to utility power (power from an outside source such as a plug-in outlet) only through
an approved device, to protect against the possibility of generator power and utility power being connected. Consult the Installation Manual (publica-
DC POWER
A 10-amp belt-driven alternator on the engine supplies DC power to recharge the starting battery for
the set.
11
Page 18
Operating Recommendations
BREAK-IN PROCEDURE
Drain the crankcase oil after the first 35 hours of operation. See the
ual for the procedure.
Maintenance
section of this man-
NO-LOAD OPERATION
Hold no-load operation to a minimum. With no
load, combustion chamber temperatures drop so
low that fuel does not burn completely . This creates
carbon deposits which clog injectors, glaze cylinders and cause piston rings and valves to stick. If it
is necessary to run the engine for long periods, con-
nect an electrical load to the generator output.
EXERCISE PERIOD
Infrequent use can result in difficult starting and
moisture condensation problems. This moisture is
a result of the engine not being run long enough to
reach normal operating temperature. In extreme
cases, water may be deposited in the oil. If this happens, severe engine damage can result. To prevent
this possibility, run the generator set under load at
least one hour per week.
Exercising for one long period each week is better
than several shorter periods of operation. Do NOT
operate the set for long periods at no load.
12
Page 19
Maintenance Schedule
Following the maintenance schedule and using the
generator set properly will result in longer genset
life, better performance, and safer operation. Perform each maintenance procedure at the time pe-
be necessary. Use the running time meter to keep
an accurate log of all service and maintenance for
warranty support (see the
Maintenance Record
section).
riod indicated or after the number of operating hours
indicated, whichever comes first. Refer to the
tenance Procedures
section for instructions.
Main-
WARNING
set during maintenance can cause severe per-
Accidental starting of the generator
sonal injury or death. Disconnect both genera-
Consult an Onan service center if the generator set
will be subjected to extremely hot or dusty conditions; a more frequent maintenance schedule may
TABLE 2. PERIODIC MAINTENANCE SCHEDULE
SERVICE TIME
SERVICE THESE ITEMS 8 hours 100 hours 250 hours 500 hours E
Inspect Set x
Check Oil Level x 5
Check Coolant Level x 6
Check Fuel Level x 7, 19
Check Battery Specific Gravity x 22
Check Pump Belt Tension x
Change Crankcase Oil and Filter x
Drain Water/Sediment From Fuel Filter x 20
Change Fuel Filter x 20, 21
Flush/Clean Cooling System x 17
Clean Generator Assembly x 15
Check Genset Brushes x
tor set starting battery cables, before performing maintenance. Remove the negative (-) cable
first to reduce the risk of arcing.
Daily Monthly 6 Months Yearly P
or or or or A
after after after after G
1
4
2,3,5
6
14
18
15
-
1 - Check for oil, fuel, cooling and exhaust system leaks. Check exhaust system audibly and visually
with genset running and repair any leaks immediately.
2 - Perform after first 35 hours of operation on new genset.
3 - Perform more often in extremely dusty conditions.
4 - Visually check belts for evidence of slippage.
5 - Yearly if operated less than 250 hours.
6 - To be performed by authorized service technician.
13
Page 20
Maintenance Procedures
INTRODUCTION
The procedures described in this section are limited
to those that can be performed by the knowledgeable genset operator. If there is any doubt as to the
correct performance of a procedure, consult your
Onan distributor. Certain procedures on the
Maintenance Schedule (brush replacement,
etc.) should only be performed by a qualified
service technician.
GENERATOR SET INSPECTION
Inspect the generator set daily or after every eight
hours of operation, whichever comes first. Check
the exhaust, fuel, and DC electrical systems as described below. Also check the mechanical condition of the set.
Engine Gauges (Remote Installation)
Check these gauges while the set is running.
Oil Pressure Gauge:
64 psi (294 to 543 kPa) when the engine is at operating temperature.
Coolant Temperature Gauge:
ture should be 165
pending on load and ambient temperature.
Oil pressure should be 28 to
Coolant tempera-
° to 195° F (74° to 91° C), de-
WARNING
Inhalation of exhaust gases can result in severe personal injury or death. Inspect
exhaust system audibly and visually for leaks
daily. Repair all leaks immediately.
Fuel System
With the set running, inspect the fuel supply lines,
return lines, filters, and fittings for leaks. Check flexible sections for cuts, cracks and abrasions. See
that the fuel lines do not rub against anything that
could break them. Replace worn fuel line components before leaks occur.
WARNING
Fuel leakage will create a fire hazard
which can result in severe personal injury or
death if ignited. While checking for leaks, do
not smoke or allow any spark, flame, pilot light
or other ignition source in the area. If any leaks
are detected, have them corrected immediately.
DC Electrical System
With the genset off, check the battery terminals for
clean and tight connections. Loose or corroded
connections create resistance which can impede
starting. Clean and reconnect loose battery cables.
Always disconnect the negative battery cable first
and connect it last, to reduce the possibility of arcing.
DC Voltmeter:
should be 12.5 to 15 volts on a 12-volt system.
Battery voltage during operation
Exhaust System
With the set running, inspect the entire exhaust system including the exhaust manifold, exhaust elbow,
muffler and exhaust pipe. Check raw water pump
operation by observing raw water discharge from
exhaust outlet: it should be about 3 gal/min. (11.4 liter/min.). Visually and audibly check for leaks at all
connections, welds, gaskets, and joints. If any
leaks are detected, shut down the genset and do
not operate until corrected. Have corroded exhaust components replaced before leaks occur.
WARNING
Ignition of explosive battery gases
can cause severe personal injury. Do not
smoke. Wear goggles, protective rubber gloves
and apron when servicing batteries.
Mechanical
With the genset stopped, check for loose belt and
fittings, leaking gaskets and hoses, or any signs of
mechanical damage. If any problems are found,
have them corrected immediately. With the genset
running, listen for any unusual noises that may indicate mechanical problems and check the oil pressure frequently . Investigate anything that indicates
possible mechanical problems.
14
Page 21
Cleaning The Set
Oil Filter Change
Clean the generator set whenever dust and dirt begin to accumulate. Dust and dirt can usually be removed with a damp cloth. Steam cleaning may be
needed to remove persistent dirt and grime. D o not
clean the genset while the engine is running. Protect the generator , control panel, and electrical connections from cleaning solvents. Cleaning solvents
can damage electrical connectors.
OIL AND FILTER CHANGE
The engine oil was drained from the crankcase before shipment. Before the initial start, fill the lu-
brication system with the recommended oil.
See the
Specifications
section for oil capacity.
Change the oil and filter at the intervals listed in Table 1. Use oil that meets the API classification and
SAE viscosity grade indicated in the previous section.
Engine Oil Change
Run the engine until thoroughly warm. Stop the engine, open the drain valve (Figure 6) and drain the
oil into a container . When completely drained, close
the valve and refill the crankcase with new oil.
Spin of f the oil filter and discard it. Thoroughly clean
the filter mounting surface. Apply a thin film of oil to
the filter gasket, and spin the filter on until the gasket
just touches the mounting pad. Then turn an additional 3/4 turn. Do not over-tighten the filter.
Add the quantity of oil listed in the Specifications
section of this manual to the crankcase, start the set
and check for leakage around the filter gasket.
Tighten the filter only enough to eliminate leaks.
Shut off the set, recheck the oil level and add additional oil if necessary.
OIL DIPSTICK
OIL
FILL
WARNING
Hot crankcase oil can cause burns if
it is spilled or splashed on skin. Keep fingers
and hands clear when removing the oil drain
plug and wear protective clothing.
WARNING
State or federal agencies have determined that prolonged contact with used engine oil can cause cancer or reproductive toxicity. When adding, changing or working with
used oil, take care not to breathe, ingest or
come into excessive contact with these substances. Wash hands after use. Wear protective clothing and equipment. Provide adequate
ventilation.
OIL
FILTER
OIL
DRAIN
VALVE
FIGURE 6. ENGINE OIL
15
Page 22
COOLING SYSTEM
The cooling system is drained before the set is
shipped. It must be refilled before the genset is
operated. Cooling system capacity is listed in the
Specifications
section.
Coolant Requirements
Engine coolant must inhibit corrosion and protect
against freezing. A 50/50 mixture of ethylene glycol
anti-freeze and water is recommended for normal
operation and storage. Use only a reliable brand of
anti-freeze that contains a rust and corrosion inhibitor. The anti-freeze should not contain a stop-
leak additive.
Do not exceed a 50/50 mixture of ethylene glycol
and water. A higher proportion of ethylene glycol
will alter the heat transfer properties of the coolant.
A 50/50 mixture will provide freeze protection to
-34
° F (-37° C).
Water used for engine coolant should be clean, low
in minerals, and free of corrosive chemicals. Use
distilled or soft water if available. Avoid the use of
well water, which may contain minerals which can
clog the heat exchanger core and reduce cooling efficiency.
Filling the Cooling System
Verify that all drain cocks are closed and all hose
clamps are secure. Remove the cooling system
pressure cap and slowly fill the cooling system with
the coolant mixture.
CAUTION
Exceeding the recommended fill
rate can cause incomplete filling of the engine
block, leading to engine damage during warmup. Always follow the recommended fill procedure.
Fill the recovery tank with coolant mixture to the
FULL mark. Operate the genset until normal operating temperature is maintained (about 15 minutes
of operation). Shut down the genset and let cool.
Add coolant to recovery tank until coolant level stabilizes at the Full mark - this may require several o p eration cycles.
WARNING
Contact with hot coolant can result
in serious burns. Do not bleed hot, pressurized
coolant from a closed cooling system.
CAUTION
The high engine temperature cutoff
will shut down the engine in a overheat condition only if the coolant level is sufficiently high
to physically contact the shutdown switch.
Loss of coolant will allow engine to overheat
without protection of shutdown device, thereby
causing severe damage to the engine. It is
therefore imperative that adequate engine coolant levels be maintained for operational integrity of the cooling system and engine coolant
overheat shutdown protection.
16
Page 23
CYLINDER BLOCK
COOLANT DRAIN
COOLANT FILL
REFILL COOLANT
HERE IF LOW
COOLANT
RECOVERY
TANK
FIGURE 7. GENSET COOLING SYSTEM
Flushing and Cleaning
Once a year, drain, flush and refill the cooling system with new coolant. To drain the system, open the
heat exchanger drain and the cylinder block drain
on the left side of engine. See Figure 7.
WARNING
severe burns. Do not bleed hot, pressurized
coolant from a closed cooling system.
Drain the system completely. The heat exchanger
and the cylinder block drain must be opened. See
Figure 7. Remove the pressure cap to aid the draining process.
Chemical Cleaning:
sorption and can block coolant flow . Clean the cooling system if rust and scale have collected on the
engine water jacket or in the heat exchanger. Use a
good cleaning compound and follow its instructions.
Contact with hot coolant can cause
Rust and scale slow heat ab-
DRAIN
TUBE
EXCHANGER
Flushing:
HEAT
After cleaning, or before filling the system with new coolant, drain the system and fill with
clean water. Run the genset for 10 minutes, then
drain the system completely . Refill with the coolant
mixture.
CAUTION
Never pour hot water into a cold engine or cold water into a hot engine. Doing so
can crack the head or the cylinder block. Do n o t
operate the unit without water for even a few
minutes.
Pressure Cap
Closed cooling systems use a pressure cap to increase the boiling point of the coolant and allow
higher operating temperatures. Replace the pressure cap every two years, or sooner if it malfunctions. The cap is rated at 7 psi (48 kPa).
Pump Belt
Access to the belt is made by removing the genset
housing. Before removing the belt guard, be sure
17
Page 24
the genset is disabled by removing the battery cables - the negative (-) cable first. Do not operate the
genset without the belt guard in place.
WARNING
Accidental starting of the generator
set can cause severe personal injury or death.
Stop the generator set and disable by disconnecting the starting battery cables (negative [-]
cable first) when maintenance or repairs are
made to the engine, controls, or generator.
To adjust the belt, loosen the bottom pivot bolt on
the alternator, then loosen the bolt that passes
through the long slot in the alternator mounting
bracket. Slide the alternator until the tension is
right. See Figure 8.
Belt tension is correct when a finger pressure of 22
pounds (10 kg) at the middle of the belt deflects it
about 0.4 inch (10 mm).
Siphon Break Valve
A siphon break valve should be installed on gensets
if the exhaust injection elbow is at or below load
water line. When properly installed, it helps prevent
sea water siphoning into the engine and compartment when the genset shuts down.
The siphon break valve is normally trouble-free.
However, when used in contaminated waters or salt
water for example, some corrosion may appear.
The valve can be checked for free movement after
unscrewing the top cover. If the valve sticks or the
seat shows wear, the valve must be replaced (see
Parts Manual). The siphon valve is not part of the
generator set; however, Onan provides a siphon
valve kit.
CAUTION
Operation of the generator set with
too much tension on the pump belt may cause
reduced belt life. For longest belt life, do not overtighten the pump belt.
PUMP/
FAN
PULLEY
ADJUST
TENSION
HERE
ALTERNATOR
FIGURE 8. PUMP BELT ADJUSTMENT
CS-1239
18
Page 25
FUEL SYSTEM
Use the best fuel available. Fuel quality is important
for dependable performance and satisfactory engine life.
WARNING
Ignition of fuel can cause serious
personal injury or death by fire or explosion. Do
not permit any flame, cigarette, pilot light, spark
or other igniter near the fuel system.
Fuel Recommendation
Use ASTM 2-D (no. 2 Diesel) or ASTM 1-D (No. 1
Diesel) fuel with a minimum Cetane number of 45.
Number 2 diesel fuel gives the best economy and
performance under most conditions. Use number 1
diesel fuel when ambient temperatures are below
32
° F (0° C), and during long periods of light engine
load.
Use low sulfur content fuel which has a cloud point
at least 10 degrees below the lowest expected fuel
temperature. (Cloud point is the temperature at
which wax crystals begin to form in diesel fuel.)
Fuel Handling Precautions
Prevent dirt, water or other contaminants from entering the fuel system. Filter or strain the fuel as the
tank is filled.
CAUTION
Due to the precise tolerances of diesel injection systems, dirt or water in the system
will cause severe damage to both the injection
pump and the injection nozzles. It is extremely
important the fuel be kept clean and water free.
Condensation (water) can cause clogging of fuel filters as well as freezing problems. Water mixing
with the sulfur in the fuel forms acid which can corrode and damage engine parts.
Low fuel in the tank promotes condensation. In
warm weather, the fuel tank cools at night quicker
than the fuel. If the fuel level is low, the upper portion of the tank will cool more rapidly, forming condensation. In cold weather, the warm fuel returning
from the injectors heats the fuel in the supply tank. If
the fuel is low, condensation may form on the upper
part of the tank. To avoid condensation, fill the
fuel tank every time the genset is used.
Priming the Fuel System
The fuel system must be primed before initial startup or after the engine has run out of fuel. Figure 9
illustrates the fuel system.
Low Pressure Fuel System:
pump, fuel filter and injection pump inlet comprise
the low pressure fuel system. To prime these components (remove the trapped air), follow the same
procedure as when the fuel filter is replaced (following section).
Be sure to check the fuel level in the tank and that
the shutoff valve is open.
The electric fuel
19
Page 26
FUEL RETURN
LINE FITTING
INJECTION
PUMP
FUEL INLET
FITTING
FROM
FUEL
TANK
EXTERNALLY MOUNTED
FUEL FILTER (SUPPLIED
BY INSTALLER)
FIGURE 9. INJECTION PUMP FUEL SYSTEM
Fuel Filter
The filter replacement interval will vary according to
the fuel quality and cleanliness. Using the wrong
fuel, or dirty fuel, will shorten service life of the filter.
CAUTION
severe damage to both the injection pump and
the injection nozzles. It is extremely important
that the fuel be kept clean and free of water.
Draining Water/Sediment From Filter:
Table 1 for the recommended time interval. Drain
about 1/4 cup of fuel as follows:
Dirt or w a t e r i n t h e system will cause
Refer to
1. Open the drain valve and bleed plug on the fuel
filter assembly (Figure 10). Collect fuel in a
suitable container and dispose of properly.
2. Tighten drain valve.
3. Bleed air from the filter housing by performing
Steps 8 through 10 in the next paragraph.
Replacing Filter Element:
Refer to Table 1 for the
recommended filter change interval. However, if
the engine shows signs of fuel starvation (reduced
power or surging), change the fuel filter. Use the following procedure to replace.
1. Loosen the drain valve and bleed screws. Collect fuel in a suitable container and dispose of
20
Page 27
properly . Remove the bleed plug. See Figure
4-5.
2. Remove filter element from the head with the
bowl connected.
3. Clean the bowl, O-ring and O-ring gland.
4. Lubricate the O-ring with clean diesel fuel and
place it in the bowl gland.
5. Tighten the drain valve.
6. Spin the bowl onto the new element. DO NOT
OVER-TIGHTEN.
7. Lubricate the element and gasket, and fill bowl
and filter element with clean diesel fuel.
8. Spin the bowl and element assembly onto the
head and hand tighten.
9. Disconnect the starter solenoid lead at the Faston terminal connector (this connector is on the
starter solenoid). This allows the fuel pump op eration without cranking the engine.
10. Depress the Start switch until fuel purges at the
bleed screw and bleed plug opening.
11. Replace the bleed plug and close bleed screw .
Reconnect the starter solenoid lead.
BLEED
PLUG
BLEED
SCREW
GASKET
ELEMENT
O−RING
AND GLAND
BOWL
DRAIN
FIGURE 10. FUEL FILTER ASSEMBLY
21
Page 28
BATTERY CARE
Service the battery at the intervals shown in the
maintenance schedule. Check the electrolyte level
more frequently during hot weather.
when the electrolyte specific gravity reaches
1.260, at approximately 80
° F (27° C).
WARNING
Batteries present the hazard of
explosion that can result in severe personal
injury. Do not smoke or allow any fire, flame,
spark, pilot light, arc-producing equipment or
other ignition sources around the battery area.
Do not disconnect battery cables while the
generator set is cranking or running because
explosive battery gases could be ignited.
WARNING
Battery electrolyte can cause severe eye damage and burns to the skin. Wear
goggles, rubber gloves and a protective apron
when working with batteries.
1. Keep the battery case clean and dry.
2. Make certain that the battery cable connections are clean and tight. Use a terminal puller
tool to remove the battery cables.
Remove corrosion from the battery terminal
connections. Wash the terminals with an ammonia solution or a solution consisting of 1/4
pound (about 100 grams) of baking soda in 1
quart (about 1 liter) of water. Be sure the vent
plugs are tight to prevent cleaning solution from
entering the cells. After cleaning, flush the outside of the battery and the surrounding areas
with clean water.
3. Identify the cable as positive (+) or negative (-)
before making the battery connections. Always connect the negative (-) cable last, to reduce the risk of arcing.
4. Maintain the electrolyte level by adding distilled
water. Fill each cell to the split-level marker in
the battery. The water component of the electrolyte evaporates, but the sulfuric acid component remains. For this reason, add water, not
electrolyte to the battery.
5. Use a battery hydrometer to check the specific
gravity of the electrolyte in each battery cell
(Figure 11). Charge the battery if the specific
gravity measures less than 1.215. Do not overcharge the battery. Stop charging the battery
SPECIFIC GRAVITY
READING SHOULD BE
1.260 AT 80
FIGURE 11. BATTERY CHECK
° F (27° C)
B45
AC GENERATOR
Generator Brushes
The generator should be inspected for brush wear
and cleaning as required per the Periodic Maintenance Schedule. This procedure should be performed by an authorized Onan service technician.
WARNING
Accidental starting of the generator
set can cause severe personal injury or death.
Stop the generator set and disable by disconnecting the starting battery cables (negative [-]
cable first) before inspecting the generator.
Generator Bearing
Inspect the bearing for evidence of outer case rotation every 1000 hours of use. The bearing should
be replaced every five years, because the bearing
grease gradually deteriorates due to oxidation. See
the Service Manual (publication 981-0512) for the
bearing replacement procedure. If the generator
requires major repair or service, contact an authorized Onan dealer or distributor.
22
Page 29
Generator Set Storage
OUT-OF-SERVICE PROTECTION
The lubricating qualities of No. 2 diesel fuel should
protect the cylinders of a diesel engine at least 30
days when the set is not being run. For storage
longer than 30 days, proceed as follows:
1. Exercise the genset (see
until the engine is at operating temperature.
2. Shut down the genset and disconnect the battery cables (negative [-] cable first). Store the
battery in a cool, dry place and connect to a
trickle charger once every 30 days to maintain
full charge.
WARNING
Battery electrolyte can cause
severe eye damage and burns to the skin.
Wear goggles, rubber gloves and a protective apron when working with batteries.
3. Drain the crankcase oil while still warm. Replace oil filter. Refill crankcase and attach a tag
indicating oil viscosity.
4. Check the coolant level. Add more coolant if
low. If freezing temperatures are possible, test
the coolant mixture.
Operation
section)
5. Plug exhaust outlets to prevent entrance of
moisture, bugs, dirt, etc.
6. Clean and wipe the entire genset. Lightly coat
parts that may rust with grease or oil.
Returning the Genset to Service
Refer to the preceding paragraphs in this
nance
section for specific service procedures.
1. Remove plug from the exhaust outlet, and open
the sea cock.
2. Check tag on oil base and verify that oil viscosity
is still correct for existing ambient temperature.
3. Clean and check the battery. Measure the electrolyte specific gravity with a hydrometer (1.260
@ 80
° F [27° C]) and verify the proper level. If
the specific gravity is low, charge the battery until the value is correct. If the level is low , add distilled water and charge until the specific gravity
reading is correct. DO NOT OVERCHARGE.
WARNING
Battery electrolyte can cause
severe eye damage and burns to the skin.
Wear goggles, rubber gloves and a protective apron when working with batteries.
Mainte-
The sea water cooling system must be drained
of water, or protected with a 50-50 anti-freeze
mixture as follows:
A. Close sea cock and remove the raw water
inlet hose at filter.
B. Place end hose in a bucket of anti-freeze
mixture and run engine until mixture is observed coming out of the exhaust outlet.
C. Replace inlet hose and tighten clamp.
4. Prime the fuel system.
5. Connect the starting battery, negative (-) cable
last.
6. Remove all loads before starting the genset.
7. After starting, run the generator set at no load
for roughly 30 seconds. Then apply a load of at
least 50 percent rated capacity.
8. Check all gauges for normal readings. Genset
is ready for operation.
23
Page 30
Troubleshooting
DC CONTROL
The DC control has a number of sensors that continuously monitor the engine for low oil pressure,
high coolant temperature and high exhaust tem-
ENGINE (COOLANT)
TEMPERATURE
MONITOR (MOUNTED
ABOVE COOLANT
PUMP)
perature. If any of these conditions occur, the control stops the engine. See Figure 13.
If a major problem is indicated, contact an Onan
dealer or distributor for help or service.
EXHAUST
TEMPERATURE
MONITOR
(MOUNTED ON
EXHAUST TUBE)
OIL PRESSURE
MONITOR
M1927s
FIGURE 13. LOCATION OF ENGINE MONITORS
24
Page 31
Low Oil Pressure
High Exhaust Temperature
Remove dipstick and check oil level. If low, add oil
to bring level up to full mark. Inspect engine exterior
for leaks and repair as necessary. The oil pressure
switch actuates the fault circuit if pressure drops below 9 psi (62 kPa).
WARNING
Crankcase pressure can blow out
hot oil and cause SEVERE burns. Do NOT
check oil while the generator set is operating.
High Coolant Temperature
If fault occurred during operation, check the set for
indication of coolant temperature over 222
C). The coolant thermostat switch closes at this
temperature and actuates the fault circuit.
Check the coolant level in the exhaust manifold after allowing the engine to cool down. Ensure pump
belt is OK and has proper tension. The raw water
flow at the exhaust outlet should be about 3
gal./min. (11.4 liter/min.). Also check cooling system cleanliness (freedom from contaminants, rust,
sludge buildup, etc.).
WARNING
Contact with hot coolant can result
in SEVERE burns. Allow cooling system to cool
before releasing pressure and removing radiator cap or release of hot coolant can result.
° F (106°
The high exhaust temperature switch is mounted on
the exhaust elbow and closes on temperature rise
above 230
set if raw water flow is lost. It opens again when the
temperature reaches about 190
WARNING
° F (110° C). It closes to shut down the
° F (88° C).
Inhalation of exhaust gas can cause
serious personal injury or death. Do not disconnect or bypass the exhaust elbow switch. Excessive heat will damage the exhaust hoses
and cause exhaust gas leakage. If exhaust hose
is damaged, shut off the generator set immediately and do not operate until hose is repaired.
AC CONTROL
The AC control consists of the line circuit breakers
and the generator field breaker. The line circuit
breakers are connected between the generator output and the load. Breakers are required to protect
the generator from shorts or overload. They are
mounted on the side of the AC control box on the
set. Line circuit breakers are customer supplied on
the set, and their location may vary.
The generator field breaker protects the generator
rotor from overload damage.
25
Page 32
How to Obtain Service
LOCATING SERVICE ASSISTANCE
When your generator set needs parts or service,
contact the nearest authorized dealer or distributor.
Onan Parts and Service representatives are
factory-trained to handle all of your service needs.
Locate the nearest authorized distributor as
follows:
1. Check the North American Sales and Service
Directory (F-118) supplied with your Onan genset. This directory lists authorized distributors
who will assist you in locating the nearest
authorized dealer.
-or-
2. Consult the Yellow Pages. Typically, our
distributors are listed under:
GENERATORS-ELECTRIC,
ENGINES-GASOLINE OR DIESEL, OR
RECREATIONAL VEHICLES-EQUIPMENT,
PARTS AND SERVICE.
-or-
3. For the name of your local Cummins/Onan or
Onan-only distributor in the United States or
Canada, call 1-800-888-ONAN (this automated service utilizes touch-tone phones
only). By entering your area code and the first
three digits of your local telephone number,
you will receive the name and telephone
number of the distributor nearest you.
If you need additional assistance, please call Onan
Corporation, 1-612-574-5000, 7:30 AM to 4:00 PM,
Central Standard Time, Monday through Friday.
SCHEDULING SERVICE
1. Before calling for service, have the following
information available:
The complete Onan product model number
and serial number (see Model Identification on
page 1)
Date of purchase
Nature of the problem
2. Contact the authorized dealer or distributor
nearest you to explain the problem and make
an appointment.
3. If you have difficulty in arranging for service or
resolving a problem, please contact the dealer
coordinator or service manager at the nearest
Cummins/Onan distributor for assistance.
INCORRECT SERVICE OR PARTS REPLACEMENT CAN RESULT IN SEVERE PERSONAL INJURY,
DEATH, AND/OR EQUIPMENT DAMAGE. SERVICE PERSONNEL MUST BE QUALIFIED TO PERFORM
ELECTRICAL AND/OR MECHANICAL SERVICE.
26
Page 33
Specifications
DIMENSIONS AND WEIGHT
MDKUB: Weight (with housing) 172.4 kg (380 pounds). . . . . . . . . . . . . .
Height 595.8 mm (23.46 inches). . . . . . . . . . . . . . . . . . . . . . . . . .
Length 709.7 mm (27.94 inches). . . . . . . . . . . . . . . . . . . . . . . . .
Width 545.4 mm (21.47 inches). . . . . . . . . . . . . . . . . . . . . . . . . .
MDKWB: Weight 204.1 kg (450 pounds). . . . . . . . . . . . . . . . . . . . . . . . . . .
Height 595.8 mm (23.46 inches). . . . . . . . . . . . . . . . . . . . . . . . . .
Length 816.7 mm (32.15 inches). . . . . . . . . . . . . . . . . . . . . . . . .
Width 545.4 mm (21.47 inches). . . . . . . . . . . . . . . . . . . . . . . . . .
GENERATOR
Type: 2-pole revolving field, 4-wire reconnectible. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standby ratings: See Genset Nameplate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency regulation, no load-rated load: 5 percent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage regulation, no load-rated load:
ENGINE
Engine type: MDKUB Kubota Z482B, diesel, 2 cylinder, vertical in-line. . . . . . .
MDKWB Kubota D722B, diesel, 3 cylinder, vertical in-line. . . . . . .
Bore and stroke: 67 x 68 mm (2.64 x 2.68 inches). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total displacement: MDKUB 479 cc (29.23 cubic inches). . . . . . . . . . . . . . . . . . . . . . . . .
MDKWB 719 cc (43.89 cubic inches). . . . . . . . . . . . . . . . . . . . . . . . .
Combustion chamber: Spherical type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine speed: 60 Hz sets: 3600 rpm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50 Hz sets: 3000 rpm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel: No. 2 diesel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil capacity with filter: MDKUB 3.78 liters (4 quarts). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDKWB 4.73 liters (5 quarts). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel consumption (No. 2 diesel fuel) liters/hour (gallons/hour) average @ half load:
MDKUB @ 60 Hz 1.75 (0.46). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDKUB @ 50 Hz 1.4 (0.37). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDKWB @ 60 Hz 2.5 (0.65). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDKWB @ 50 Hz 2.0 (0.52). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel consumption, (No. 2 diesel fuel) liters/hour (gallons/hour) average @ full load:
MDKUB @ 60 Hz 2.65 (0.7). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDKUB @ 50 Hz 2.1 (0.55). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDKWB @ 60 Hz 3.7 (0.98). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDKWB @ 50 Hz 3.0 (0.79). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel pump lift (self-priming) 1.2 meters (48 inches). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel inlet 1/8-27, NPT, Female. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel return 1/8-27, NPT, Female. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total air per minute required (cooling and combustion): 4.25 m
Battery charge alternator maximum output (regulated) 10 amperes. . . . . . . . . . . . . . . . . . . . .
Battery voltage (nominal) 12 volts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery recommendation minimum cranking performance @ 0
Coolant capacity: MDKUB 2 liters (2.1 qt.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MDKWB 3.5 liters (3.7 qt.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
° F (-18° C) 360 ampere. . . . .
±2 percent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
/min. (150 ft3/min.). . . . . . . . .
27
Page 34
Maintenance Record
Keep a record of all periodic and unscheduled
maintenance. Record the service date and the
DATE HOUR METER READING SERVICE PERFORMED / NOTES
number of operating hours from the optional hour
meter (if equipped).
Record the name, address, and phone number of
your authorized Onan service center.
28
Page 35
Information for California Genset Users
These gensets meet the requirements of California’s Exhaust Emissions Standards for 1995 and
later for Utility and Lawn and Garden Equipment
Engines.
As a California user of these gensets, 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 genset label is prohibited.
TABLE 4. EMISSIONS CONTROL INFORMATION
The California emissions control warranty statement is located in
Genset Warranty Information
Engine Fuel Requirements
Engine Lubricating Oil Requirements See ENGINE OIL RECOMMENDATIONS in
Engine Adjustments
the same packet of information as this manual when the genset is
shipped from the factory.
The engine is certified to operate on diesel fuel. See FUEL RECOMMENDATIONS in
High Idle Speed. This is a service procedure requiring trained
personnel and proper tools. See the Service Manual.
You should carefully review Operator (Owner),
Installation and other manuals and information you
receive with your genset. If you are unsure that the
installation, use, maintenance or service of your
genset is authorized, you should seek assistance
from an authorized dealer.
California genset users may use Table 4 as an aid in
locating information related to the California Air Resources Board requirements for emissions control.
Pre-Start Checks
.
Pre-Start Checks.
Engine Emission Control System
The engine emission control system consists of engine design
and precision manufacture. (IFI)
29
Page 36
Cummins Power Generation
1400 73rd Avenue N.E.
Minneapolis, MN 55432
763-574-5000
Fax: 763-528-7229
Cummins and Onan are registered trademarks of Cummins Inc.
Loading...