Generac Power Systems MLG15 User manual

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Owner’s Manual

For

Diesel Generator

MLG8 • MLG15 • MLG20 • MLG20ICAN



ii Owner’s Manual for Mobile Generator

(000004)

WARNING

California Proposition 65. Engine exhaust and some

of its constituents are known to the state of California

to cause cancer, birth defects, and other reproductive

harm.

(000005)

WARNING

California Proposition 65. This product contains or

emits chemicals known to the state of California to

cause cancer, birth defects, and other reproductive

harm.

Owner’s Manual for Mobile Generator iii

Table of Contents

Introduction and Safety

Introduction .......................................................1

Read This Manual Thoroughly ..........................1

Safety Rules ......................................................1

General Hazards ...............................................2

Explosion and Fire Hazards ..............................2

Trailer Hazards ..................................................3

Electrical Hazards .............................................3

Battery Hazards ................................................4

General Information

Component Locations .......................................5

Unit and Serial Number Locations ....................6

Engine Oil Recommendations ...........................6

Coolant Recommendation .................................6

Main Control Panels ..........................................7

Operation

Prestart Checklist ..............................................9

Starting the Unit ................................................9

Emergency Stop Switch ..................................10

Automatic Shutdown .......................................10

Voltage Regulator ...........................................11

Derating for Altitude ........................................11

Wet Stacking ...................................................11

Receptacle Panel ............................................11

Shutting Down the Unit ...................................11

Towing the Unit ...............................................11

Lifting the Unit .................................................12

Maintenance

Emissions Information .................................... 13

Daily Walk Around Inspection ......................... 13

General Maintenance ..................................... 13

Basic Maintenance Schedule ......................... 13

Jack Maintenance ........................................... 16

Side-Wind Models ...........................................16

Top-Wind Models ............................................16

Trailer Wheel Bearings ................................... 16

Lower Radiator Hose Heater Option - Use

and Maintenance ............................................ 17

Wiring Diagrams and Service Log

AC Wiring Diagram W/3-30A, 1-50A Outlets .. 19

AC Wiring Panel Options ................................ 20

AC Wiring Diagram - MLG 8 ........................... 21

DC Wiring Diagram - MLG 8 and MLG15 ....... 22

DC Wiring Diagram - MLG 20 ......................... 23

Trailer Harness ............................................... 24

Service Log ..................................................... 25

iv Owner’s Manual for Mobile Generator

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Owner’s Manual for Mobile Generator 1

Introduction and Safety

Section 1 Introduction and Safety

Introduction

Thank you for purchasing a Generac Mobile Products

LLC product. This unit has been designed to provide

high-performance, efficient operation, and years of use

when maintained properly.

The information in this manual is accurate based on

products produced at the time of publication. The

manufacturer reserves the right to make technical

updates, corrections, and product revisions at any time

without notice.

Read This Manual Thoroughly

If any section of the manual is not understood, contact

your nearest Generac Mobile Products Authorized

Dealer, or contact Generac Mobile Products (GMP)

Customer Service at 1-800-926-9768, or

www.generacmobileproducts.com with any questions

or concerns.

The owner is responsible for proper maintenance and

safe use of the equipment. Before installing, operating, or

servicing this generator:

Save these instructions for future reference. This manual

contains important instructions for the generator that

should be followed during installation, operation and

maintenance of the generator and batteries. ALWAYS

supply this manual to any individual that will use this

machine.

Safety Rules

The manufacturer cannot anticipate every possible

circumstance that might involve a hazard. The warnings

in this manual, and on tags and decals affixed to the unit

are, therefore, not all inclusive. If using a procedure, work

method or operating technique that the manufacturer

does not specifically recommend, verify that it is safe for

others. Also make sure the procedure, work method or

operating technique utilized does not render the

equipment unsafe.

Throughout this publication, and on tags and decals

affixed to the unit, DANGER, WARNING, CAUTION and

NOTE blocks are used to alert personnel to special

instructions about a particular operation that may be

hazardous if performed incorrectly or carelessly. Observe

them carefully. Their definitions are as follows:

NOTE: Notes contain additional information important to

a procedure and will be found within the regular text of

this manual.

These safety warnings cannot eliminate the hazards that

they indicate. Common sense and strict compliance with

the special instructions while performing the action or

service are essential to preventing accidents.

(000100a)

WARNING

Consult Manual. Read and understand manual

completely before using product. Failure to

completely understand manual and product

could result in death or serious injury.

(000001)

DANGER

Indicates a hazardous situation which, if not avoided,

will result in death or serious injury.

(000002)

WARNING

Indicates a hazardous situation which, if not avoided,

could result in death or serious injury.

(000003)

CAUTION

Indicates a hazardous situation which, if not avoided,

could result in minor or moderate injury.

2Owner’s Manual for Mobile Generator

Introduction and Safety

General Hazards

Explosion and Fire Hazards

Asphyxiation. Running engines produce

carbon monoxide, a colorless, odorless,

poisonous gas. Carbon monoxide, if not

avoided, will result in death or serious injury.

(000103)

DANGER

(000107)

WARNING

Hearing Loss. Hearing protection is

recommended when using this machine.

Failure to wear hearing protection could

result in permanant hearing loss.

(000111)

WARNING

Moving Parts. Keep clothing, hair, and

appendages away from moving parts. Failure

to do so could result in death or serious injury.

(000108)

WARNING

Hot Surfaces. When operating machine, do not

touch hot surfaces. Keep machine away from

combustibles during use. Hot surfaces

could result in severe burns or fire.

WARNING

In case of an emergency, press the

emergency stop button to stop the engine

immediately. Failure to do so could result

in death or serious injury. (000298)

CAUTION

(000291)

Equipment damage. Do not attempt to start or operate

a unit in need of repair or scheduled maintenance.

Doing so could result in serious injury, death, or

equipment failure or damage.

WARNING

Risk of injury. Do not operate or service this

machine if not fully alert. Fatigue can impair the

ability to service this equipment and could result

in death or serious injury. (000215)

(000182)

WARNING

CAUTION

(000229)

Equipment or property damage. Do not block

air intake or restrict proper air flow. Doing so

could result in unsafe operation or damage

to unit.

(000105)

DANGER

Explosion and Fire. Fuel and vapors are

extremely flammable and explosive. Add fuel

in a well ventilated area. Keep fire and spark

away. Failure to do so will result in death

or serious injury.

WARNING

Fire risk. Fuel and vapors are extremely

flammable. Do not operate indoors. Doing so

could result in death, serious injury, or

property or equipment damage. (000281)

(000147)

WARNING

Risk of Fire. Unit must be positioned in a

manner that prevents combustible material

accumulation underneath. Failure to do so

could result in death or serious injury.

Owner’s Manual for Mobile Generator 3

Introduction and Safety

Trailer Hazards Electrical Hazards

WARNING

Trailer must be securely coupled to the hitch

and chains correctly attached. Uncoupled or

unchained towing could result in death or serious

injury. (000233)

WARNING

Do not operate this unit while transporting.

Doing so could result in death or serious

injury.

(000231)

(000234a)

WARNING

Crushing hazard. Verify unit is properly secured

and on level ground. An unsecured unit can

suddenly roll or move, causing death or serious

injury.

WARNING

Property or Equipment Damage. Tighten wheel lug

nuts after first 50 miles to factory specifications.

Failure to do so could result in death, serious injury,

property or equipment damage. (000235)

(000145)

DANGER

Electrocution. In the event of electrical accident,

immediately shut power OFF. Use non-conductive

implements to free victim from live conductor. Apply

first aid and get medical help. Failure to do so will

result in death or serious injury.

(000104)

DANGER

Electrocution. Water contact with a power

source, if not avoided, will result in death

or serious injury.

(000144)

DANGER

Electrocution. Contact with bare wires,

terminals, and connections while generator

is running will result in death or serious injury.

(000152)

DANGER

Electrocution. Verify electrical system is

properly grounded before applying power.

Failure to do so will result in death or serious

injury.

(000123)

DANGER

Electrocution. Turn utility supply OFF before

working on utility connections of the transfer

switch. Failure to do so will result in

death or serious injury.

(000150)

DANGER

Electrocution. Never connect this unit to the electrical

system of any building unless a licensed electrician

has installed an approved transfer switch. Failure to

do so will result in death or serious injury.

(000164)

WARNING

Electrical shock. Disconnect battery ground

terminal before working on battery or battery

wires. Failure to do so could result in death

or serious injury.

4Owner’s Manual for Mobile Generator

Introduction and Safety

Battery Hazards

Always recycle batteries in accordance with local laws

and regulations. Contact your local solid waste collection

site or recycling facility to obtain information on local

recycling processes. For more information on battery

recycling, visit the Battery Council International website

at: http://batterycouncil.org

(000188)

DANGER

Electrocution. Do not wear jewelry while

working on this equipment. Doing so will

result in death or serious injury.

(000137a)

WARNING

(000162)

WARNING

Explosion. Do not dispose of batteries in a fire.

Batteries are explosive. Electrolyte solution can cause

burns and blindness. If electrolyte contacts skin or eyes,

flush with water and seek immediate medical attention.

(000163a)

WARNING

Risk of burn. Do not open or mutilate batteries.

Batteries contain electrolyte solution which can

cause burns and blindness. If electrolyte contacts

skin or eyes, flush with water and seek immediate

medical attention.

WARNING

Environmental Hazard. Always recycle batteries at an

official recycling center in accordance with all local

laws and regulations. Failure to do so could result in

environmental damage, death or serious injury.

(000228)

Owner’s Manual for Mobile Generator 5

General Information

Section 2 General Information

Component Locations

Figure 2-1. Component Locations

Table 2-1. Generator Components

AFuel Filler Location (under door) EReceptacle Panel (not available on MLG8 units)

BRadiator Access Panel FGround Studs (2)

CControl Panel Locations (under door) GSafety Chains

DEmergency Stop Switch (on MLG8 units,

switch is located on front panel)

HTongue Jack



6Owner’s Manual for Mobile Generator

General Information

Unit and Serial Number Locations

See Figure 2-2 to locate the unit ID tag (A) and Vehicle

Identification Number (VIN) tag (B). Important

information, such as the unit model number, serial

number, VIN and tire loading information is found on

these tags. Record the information from these tags so it

is available if the tags are lost or damaged. When

ordering parts or requesting assistance, you may be

asked to provide this information.

Figure 2-2. Unit and Serial Number Locations

Engine Oil Recommendations

To maintain the product warranty, the engine oil should

be serviced in accordance with the recommendations of

this manual.

The engine has been filled with factory engine oil of a

grade recommended by the engine supplier.

Use a high quality detergent oil with an appropriate

classification and viscosity for the engine type and

ambient temperature conditions. Consult your Generac

Mobile Products Authorized Dealer or the applicable

engine service manual for engine oil recommendations.

Coolant Recommendation

Consult your Generac Mobile Products Authorized

Dealer or the applicable engine service manual for

engine coolant recommendations. See table below for

mixtures:

* Maximum freeze protection is at 70%.

003550

Freezing Point °F (°C) -12

(-24)

-34

(-36)

-54

(-48)

-90

(-67)

Water (% Volume) 60 50 40 30

Anitfreeze (% Volume) 40 50 60 70*

(000149)

DANGER

Risk of poisoning. Do not use mouth to

siphon coolant. Doing so will result in

death or serious injury.

(000154)

WARNING

Risk of burns. Do not open coolant system

until engine has completely cooled.

Doing so could result in serious injury.

(000165)

CAUTION

Do not use any chromate base rust inhibitor with

propylene glycol base antifreeze, boosters or

additives. Doing so will cause overheating.

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