Generac 009600-5 User Manual

POWER SYSTEMS, INC.

®

Owner’s Manual

Air-cooled Recreational

Vehicle Generators

• Model: 009600-5 and 009734-5
PRIMEPACT 66G and 66LP

Generac®Power Systems, Inc.

INTRODUCTION

READ THIS MANUAL THOROUGHLY

If you do not understand any portion of this manual,
contact Generac or your nearest Generac Authorized
Service Dealer for starting, operating and servicing
procedures.

Throughout this publication, and on tags and
decals affixed to the generator, DANGER, WARNING,
CAUTION and NOTE blocks are used to alert you to
special instruction about a particular operation that
may be hazardous if performed incorrectly or care­lessly. Observe them carefully. Their definitions are
as follows:

After this heading, you can read instructions that,
if not strictly complied with, will result in personal
injury or property damage.

After this heading, you can read instructions that,
if not strictly complied with, may result in person­al injury or property damage.

After this heading, you can read instructions that,
if not strictly complied with, could result in dam­age to equipment and/or property.

NOTE:

After this heading, you can read explanatory
statements that require special emphasis.

These safety warnings cannot eliminate the hazards
that they indicate. Common sense and strict compli­ance with the special instructions while performing
the service are essential to preventing accidents.

Four commonly used safety symbols accompany the
Danger, Warning and Caution blocks. The type of
information each indicates follows:

This symbol points out important safety infor­mation that, if not followed, could endanger
personal safety and/or property of you and
others.

This symbol points out potential explosion
hazard.

This symbol points out potential fire hazard.

This symbol points out potential electrical
shock hazard.

The operator (driver) is responsible for proper and
safe use of the vehicle and its equipment, and the
safety of all vehicle occupants. We strongly recom­mend that the operator read this manual and thor­oughly understand all instructions before using this
equipment. We also strongly recommend instructing
other occupants in the vehicle to properly start and
operate the generator. This prepares them if they
need to operate the equipment in an emergency.

CONTENTS

This manual contains pertinent owner’s information,
including warranty, electrical diagrams, exploded
views and lists of repair parts for generator model
numbers 009600-5 and 009734-5. In addition, the
latter portion of this manual contains information
necessary for the proper installation of these
generators.

OPERATION AND MAINTENANCE

It is the operator's responsibility to perform all safe­ty checks, to make sure that all maintenance for safe
operation is performed promptly, and to have the
equipment checked periodically by a Generac
Authorized Service Dealer. Normal maintenance ser­vice and replacement of parts are the responsibility of
the owner/operator and, as such, are not considered
defects in materials or workmanship within the
terms of the warranty. Individual operating habits
and usage contribute to the need for maintenance
service.

Proper maintenance and care of your generator
ensure a minimum number of problems and keep
operating expenses at a minimum. See your Generac
Authorized Service Dealer for service aids and acces­sories.

HOW TO OBTAIN SERVICE

When your generator requires servicing or repairs,
simply contact a Generac Authorized Service Dealer
for assistance. Service technicians are factory-trained
and are capable of handling all of your service needs.

When contacting a Generac Authorized Service
Dealer or the factory about parts and service, always
supply the complete model number and serial num­ber of your unit as given on its data decal, which is
located on your generator.

Model No. ____________ Serial No. ______________

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AUTHORIZED SERVICE

DEALER LOCATION

To locate the GENERAC AUTHORIZED SERVICE

DEALER nearest you, please call this number:

1-800-333-1322

ONLY DEALER LOCATION INFORMATION

CAN BE OBTAINED AT THIS NUMBER.

Table of Contents

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

Generac®Power Systems, Inc. 1

Part I — Operating Instructions

Introduction ..................................................Inside Front Cover

Read This Manual Thoroughly ..........................................IFC

Contents ............................................................................IFC

Operation and Maintenance ..............................................IFC

How to Obtain Service ......................................................IFC

Authorized Service Dealer Locator Number ..........................IFC

Safety Rules ..................................................................................2

Section 1 – General Information ............................................4

1.1 Generator Identification ................................................4

1.2 Generator Applicability ..................................................5

1.3 Installation ....................................................................5

1.4 Safety ............................................................................5

1.5 Generator AC Connection System ..................................5

1.6 Specifications ................................................................6

1.6.1 Fuel Requirements & Consumption ....................6

1.6.2 Engine Oil Requirements ....................................6

1.6.3 Generator Specifications......................................6

1.6.4 Engine Specifications ..........................................7

1.6.5 Emissions Compliance Period ............................7

Section 2 – Operation................................................................7

2.1 Generator Control Panel ................................................7

2.1.1 Fuel Primer..........................................................7

2.1.2 Start/Stop Switch ................................................7

2.1.3 15 Amp Fuse........................................................7

2.1.4 Line Breakers ......................................................7

2.2 Optional Remote Start/Stop Panel..................................8

2.3 Automatic Choke ..........................................................8

2.3.1 Choke Solenoid ..................................................8

2.3.2 Prechoke..............................................................8

2.4 Before Starting the Engine ............................................8

2.4.1 Installation..............................................................8

2.4.2 Engine Lubrication ................................................8

2.4.3 Fuel Supply ............................................................8

2.4.4 Cooling and Ventilating Air ....................................8

2.4.5 Engine Exhaust Gas ..............................................9

2.5 Starting the Generator ..................................................9

2.6 Stopping the Generator..................................................9

2.7 Applying Loads to Generator ........................................9

2.7.1 Letting the Engine Stabilize ................................9

2.7.2 Do Not Overload the Generator ........................10

2.8 Protection Systems ......................................................10

2.8.1 Low Oil Pressure Switch....................................10

2.8.2 High Temperature Switch ..................................10

2.8.3 Field Boost ........................................................10

2.8.4 Overvoltage Protection ......................................11

2.8.5 25-Hour Break-in Period....................................11

2.8.6 25-Hour Checkup ..............................................11

2.8.7 Operation in High Grass or Brush ....................11

Section 3 – Maintenance ........................................................11

3.1 Checking the Engine Oil Level......................................11

3.2 Changing the Engine Oil and/or Oil Filter ....................12

3.3 Maintaining the Engine Air Cleaner ............................12

3.3.1 Cleaning the Foam Precleaner............................12

3.4 Clean Air Intake Screen ..............................................13

3.5 Checking the Engine Spark Plug ..................................13

3.6 Fuel Filter (Gasoline Only) ..........................................13

3.7 Spark Arrestor Muffler ................................................13

3.8 Cleaning the Generator ................................................14

3.9 Battery Maintenance ....................................................14

3.9.1 Weekly ..............................................................14

3.9.2 Every Six Months ..............................................14

3.10 Major Service Manual ..................................................15

3.11 Drive Belt ....................................................................15

3.12 Exercising the Generator ............................................15

3.13 Out of Service Procedure ............................................15

3.13.1 Removal From Service ....................................15

3.13.2 Return to Service ............................................15

3.14 Wattage Reference Guide..............................................15

Section 4 – Notes......................................................................16

Part II — Installation Instructions ........................................17

Safety Rules..........................................................................18-19

Section 5 — General Information..........................................20

5.1 Purpose and Scope of the Manual................................20

5.2 Safety ..........................................................................20

5.3 Standard Booklets ......................................................20

5.4 Equipment Description ................................................20

5.5 Generator Engine Operating Speed..............................20

5.6 Generator AC Connection System ................................20

Major Dimensions and Features ..................................21

Section 6 — Installation ..........................................................22

6.1 Location and Support ..................................................22

6.1.1 Generator Location............................................22

6.1.2 Generator Supports ..........................................22

6.1.3 Suspended Mounting ........................................22

6.1.4 Generator Restraint ..........................................23

6.2 Generator Compartments ............................................23

6.2.1 Compartment Size ............................................23

6.2.2 Compartment Construction ..............................23

6.2.3 Sound Insulating Materials................................24

6.2.4 Acoustics ..........................................................24

6.2.5 Compartment Floor Cutouts..............................25

6.3 Cooling and Ventilation................................................26

6.3.1 Generator Airflow ..............................................26

6.3.2 Cooling Air Inlet Openings ................................26

6.3.3 Compensating for Restrictions ..........................27

6.3.4 Testing the Installation ......................................27

6.4 Gasoline Fuel System ..................................................27

6.4.1 Fuel Tank ..........................................................28

6.4.2 Generator Fuel Supply Line ..............................28

6.4.2.1 Rigid Fuel Lines..........................................28

6.4.2.2 Flexible Fuel Lines......................................28

6.5 LP Gas Fuel System ....................................................28

6.5.1 Parts not included in Fuel System ....................28

6.5.2 Some Important Considerations........................29

6.5.3 Vapor Withdrawal ..............................................29

6.5.4 Primary Regulator..............................................29

6.5.5 Gaseous Carburetion ........................................29

6.5.6 Fuel Supply Lines ..............................................30

6.5.7 Excess Flow Valve ..............................................30

6.5.8 Leakage Tests ....................................................30

6.6 Exhaust Systems..........................................................30

6.6.1 Mufflers and Spark Arrestors............................31

6.6.2 Type of Exhaust System ....................................31

6.6.3 Exhaust System Safety ......................................31

6.7 Electrical Connections ................................................31

6.7.1 Electrical Junction Box ....................................31

6.7.2 Wiring ................................................................32

6.7.3 Generator AC Connections ................................32

6.7.4 Conduit..............................................................32

6.7.5 Isolating Different Power Sources ......................32

6.7.6 Power Supply Cord............................................33

6.7.7 Ground Fault Circuit Interrupters ....................33

6.8 Battery Installation ......................................................34

6.8.1 Recommended Battery ......................................34

6.8.2 Battery Cables ..................................................34

6.8.3 Battery Cable Connections ................................34

6.8.4 Battery Compartment ........................................34

6.9 Optional Accessories ....................................................34

6.9.1 Remote Panel Models ........................................35

Section 7 — Post Installation ................................................35

7.1 Post Installation Tests ..................................................35

7.2 Before Initial Start-up ..................................................35

7.3 Initial Start ..................................................................35

7.4 Testing Under Load......................................................35

7.5 Installation Checklist ..................................................36

Section 8 – Troubleshooting ..................................................37

8.1 Troubleshooting Guide ................................................37

Section 9 – Electrical Data......................................................38

Section 10 – Exploded Views and Parts Lists....................40

Section 11 – Notes....................................................................53

Section 12 – Warranty ............................................................56

2 Generac®Power Systems, Inc.

Study these SAFETY RULES carefully before
installing, operating or servicing this equipment.
Become familiar with this manual and with the unit.
The generator can operate safely, efficiently and reli­ably only if it is properly installed, operated and
maintained. Many accidents are caused by failing to
follow simple and fundamental rules or precautions.

Generac cannot possibly 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
you use a procedure, work method or operating tech­nique Generac does not specifically recommend, you
must satisfy yourself that it is safe for you and others.
You also must make sure the procedure, work
method or operating technique that you choose does
not render the generator unsafe.

Despite the safe design of this generator,
operating this equipment imprudently, neglect­ing its maintenance or being careless can cause
possible injury or death. Permit only responsi­ble and capable persons to operate or maintain
this equipment.

Potentially lethal voltages are generated by
these machines. Ensure all steps are taken to
render the machine safe before attempting to
work on the generator.

Parts of the generator are rotating and/or hot
during operation. Exercise care near running
generators.

GENERAL HAZAR

DS

• For safety reasons, Generac recommends

that the installation, initial start-up and mainte­nance of this equipment is carried out by a
Generac Authorized Service Dealer.

• The engine exhaust fumes contain carbon monox-

ide, which can be DEADLY. This dangerous gas, if
breathed in sufficient concentrations, can cause
unconsciousness or even death. This exhaust sys­tem must be installed properly, in strict compli­ance with applicable codes and standards.
Following installation, you must do nothing that
might render the system unsafe or in noncompli­ance with such codes and standards. The genera­tor compartment must be completely vapor sealed
from the vehicle interior. There must be no possi­bility of exhaust fumes entering the vehicle interi­or. Never operate this equipment with a leaking or
defective exhaust system.

• Keep hands, feet, clothing, etc., away from drive

belts, fans, and other moving or hot parts. Never
remove any drive belt or fan guard while the unit is
operating.

• Adequate, unobstructed flow of cooling and venti-

lating air is critical to correct generator operation
and is required to expel toxic fumes and fuel
vapors from the generator compartment. Without
sufficient cooling airflow, the engine/generator
quickly overheats, which causes serious damage to
the generator. Do not alter the installation or per­mit even partial blockage of ventilation provisions,
as this can seriously affect safe operation of the
generator.

• When working on this equipment, remain alert at

all times. Never work on the equipment when you
are physically or mentally fatigued.

• Inspect the generator regularly, and contact your

nearest Generac Authorized Service Dealer imme­diately for parts needing repair or replacement.

• Before performing any maintenance on the genera-

tor, disconnect its battery cables to prevent acci­dental start up. Disconnect the cable from the bat­tery post indicated by a NEGATIVE, NEG or (–)
first. Reconnect that cable last.

• Never use the generator or any of its parts as a

step. Stepping on the unit can stress and break
parts, and may result in dangerous operating con­ditions from leaking exhaust gases, fuel leakage,
oil leakage, etc.

Safety Rules

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe
operation be copied and posted in potential hazard areas of the recreational vehicle.
Safety should be stressed to all operators and potential operators of this equipment.

The engine exhaust from this product

contains chemicals known to the state

of California to cause cancer, birth

defects or other reproductive harm.

WARNING:

This product contains or emits chemicals
known to the state of California to cause

cancer, birth defects or other reproductive harm.

WARNING:

Generac®Power Systems, Inc. 3

ELECTRICAL HAZARDS

• The generator covered by this manual produces
dangerous electrical voltages and can cause fatal
electrical shock. Avoid contact with bare wires, ter­minals, connections, etc., while the unit is running.
Ensure all appropriate covers, guards and barriers
are in place before operating the generator. If you
must work around an operating unit, stand on an
insulated, dry surface to reduce shock hazard.

• Do not handle any kind of electrical device while
standing in water, while barefoot, or while hands
or feet are wet. DANGEROUS ELECTRICAL
SHOCK MAY RESULT.

• During installation onto the vehicle, have the gen­erator properly grounded (bonded) either by solid
mounting to the vehicle frame or chassis, or by
means of an approved bonding conductor. DO
NOT disconnect the bonding conductor, if so
equipped. DO NOT reconnect the bonding conduc­tor to any generator part that might be removed or
disassembled during routine maintenance. If the
grounding conductor must be replaced, use only a
flexible conductor that is of No. 8 American Wire
Gauge (AWG) copper wire minimum.

• In case of accident caused by electric shock, imme­diately shut down the source of electrical power. If
this is not possible, attempt to free the victim from
the live conductor. AVOID DIRECT CONTACT
WITH THE VICTIM. Use a nonconducting imple­ment, such as a rope or board, to free the victim
from the live conductor. If the victim is uncon­scious, apply first aid and get immediate medical
help.

• Never wear jewelry when working on this equip­ment. Jewelry can conduct electricity resulting in
electric shock, or may get caught in moving com­ponents causing injury.

FIRE HAZARDS

• For fire safety, the generator must be installed and
maintained properly. Installation always must
comply with applicable codes, standards, laws and
regulations. Adhere strictly to local, state and
national electrical and building codes. Comply
with regulations the Occupational Safety and
Health Administration (OSHA) has established.
Also, ensure that the generator is installed in
accordance with the manufacturer’s instructions
and recommendations. Following proper installa­tion, do nothing that might alter a safe installation
and render the unit in noncompliance with the
aforementioned codes, standards, laws and regu­lations.

• Keep a fire extinguisher in the vehicle at all times.
Extinguishers rated “ABC” by the National Fire
Protection Association are appropriate for use on
the recreational vehicle generator electrical sys­tem. Keep the extinguisher properly charged and
be familiar with its use. If you have any question
pertaining to fire extinguishers, consult your local
fire department.

EXP

LOSION HAZARDS

• Do not smoke around the generator. Wipe up any
fuel or oil spills immediately. Ensure that no com­bustible materials are left in the generator com­partment, or on or near the generator, as FIRE or
EXPLOSION may result. Keep the area surround­ing the generator clean and free from debris.

• Gasoline is extremely FLAMMABLE and its vapors
are EXPLOSIVE. Do not permit smoking, open
flame, sparks or any source of heat in the vicinity
while handling gasoline. Comply with all laws gov­erning the storage and handling of gasoline.

• This generator may use liquid propane (LP) gas as
a fuel. LP gas is highly EXPLOSIVE. The gas is
heavier than air and tends to settle in low areas
where even the slightest spark can ignite the gas
and cause an explosion.

Safety Rules

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

4 Generac®Power Systems, Inc.

Section 1 – General Information

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

Please record the following information from the generator DATA DECAL or information decal.

1. Model Number ____________________ 2. Serial Number __________________

3. kW Rating__________________________ 4. Rated Voltage __________________

5. Phase ______________________________ 6. Hertz __________________________

1.1 GENERATOR IDENTIFICATION

REFERENCE NUMBER IDENTIFICATION

1. Generator Air Intake Screen

2. Data Plate

3. Engine Start/Stop Switch

4. 15 amp Fuse

5. 30 amp Circuit Breaker

6. Optional Remote Panel Receptacle

7. Generator AC Output Leads

8. Starter Contactor

9. Fuel Inlet

10. Fuel Primer Switch

11. Fuel Pump

12. Oil Filter

13. Oil Drain Plug

14. Oil Dipstick and Filler Tube

1

3

2

4

12

11

10

9

7

6

5

14

13

8

Generac®Power Systems, Inc. 5

Section 1 – General Information

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

1.2 GENERATOR APPLICABILITY

These generators have been designed and manufac­tured for supplying electrical power for recreational
vehicles. You should not modify the generator or use
it for any application other than for what it was
designed. If there are any questions pertaining to its
application, write or call the factory. Do not use the
unit until you have been advised by competent
authority.

For fire safety, the generator must have been
properly installed in compliance with ANSI

119.2-1975/NFPA 501C-1974, “Standard for
Recreational Vehicles, Part III – Installation of
Electrical Systems.” The generator also must
have been installed in strict compliance with
the manufacturer’s detailed installation instruc­tions. After installation, do nothing that might
render the unit in noncompliance with such
codes, standards and instructions.

You can use your generator set to supply electrical
power for operating one of the following electrical
loads:

• PRIMEPACT 66G: 120 and/or 240 volts, single
phase, 60 Hz electrical loads. These loads can
require up to 6600 watts (6.6 kW) of power, but
cannot exceed 55 AC amperes of current at 120
volts or exceed 27.5 AC amperes at 240 volts.

• PRIMEPACT 66LP: 120 and/or 240 volts, single
phase, 60 Hz electrical loads. These loads can
require up to 6200 watts (6.2 kW) of power, but
cannot exceed 51.7 AC amperes of current at 120
volts or exceed 25.8 AC amperes at 240 volts.

Do not overload the generator. Some installa­tions may require that electrical loads be alter­nated to avoid overloading. Applying exces­sively high electrical loads may damage the
generator and may shorten its life. Add up the
rated watts of all electrical lighting, appliance,
tool and motor loads the generator will power
at one time. This total should not be greater
than the wattage capacity of the generator. If
an electrical device nameplate gives only volts
and amps, multiply volts times amps to obtain
watts (volts x amps = watts). Some electric
motors require more watts of power (or amps
of current) for starting than for continuous
operation.

1.3 INSTALLATION

This Owner’s Manual has been prepared under the
assumption that a competent, qualified technician
installed the generator into an industrial vehicle. We
also assume the installer complied with all applicable
codes, standards and regulations pertaining to instal­lation.

An INSTALLATION MANUAL was shipped with the
generator. That Manual contains manufacturer’s
instructions and recommendations for installing the
unit into an industrial vehicle. After installation,
installers should forward the Installation Manual to
Owners/Operators for their information.

Owners/Operators have the responsibility to make
sure that nothing is done that might render the instal­lation unsafe or in non-compliance with applicable
codes, standards and instructions.

1.4 SAFETY

Before using the generator set, carefully read GEN­ERAL SAFETY RULES inside the cover. Comply with
these RULES to prevent accidents and damage to
equipment and/or property. Generac suggests copy­ing and posting the GENERAL SAFETY RULES to
potential operators of this equipment.

1.5 GENERATOR AC CONNECTION
SYSTEM

These air-cooled generator sets are equipped with
dual stator AC power windings. These two stator
windings supply electrical power to customer electri­cal loads by means of a dual 2-wire connection sys­tem.

Generators may be installed to provide the following
outputs:

1) 120 VAC loads only — one load with a maximum

total wattage requirement equal to the generator’s
rated power output (in watts), and 120V across the
generator output terminals. Figure 1.1, page 6,
shows the generator lead wire connections for
120VAC ONLY.

2) 120/240 VAC loads — one load with a maximum

total wattage requirement equal to the generator’s
rated power output, and 240V across the generator
output terminals; or two seperate loads, each with a
maximum total wattage requirement equal to half of
the generator’s rated power output (in watts), and
120V across the generator output terminals.
Figure 1.2, page 6, shows the generator lead wire
connections for 120/240 VAC loads.

6 Generac®Power Systems, Inc.

Section 1 – General Information

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

Figure 1.1 – Connection for 120 Volts Only

Figure 1.2 - Connection for 120/240 Volts

1.6 SPECIFICATIONS

1.6.1 FUEL REQUIREMENTS

This generator is equipped with a gasoline fuel system
as standard equipment. Specific installations may pro­vide either a separate fuel tank for the generator, or the
generator may “share” the vehicle engine’s fuel tank.

Fuel Consumption (gph/lbs.ph)

NOTE

Some installations using a “shared” fuel tank may
have a generator fuel pickup tube that is shorter
than the vehicle engine’s pickup tube. Such an
arrangement causes the generator engine to “run
out of gas” while adequate fuel for the vehicle
remains in the tank.

To reduce lead and carbon deposits use high quality
UNLEADED gasoline with the generator. Leaded
REGULAR grade gasoline is an acceptable substitute.

NOTE:

Using unleaded gasoline contributes to longer engine
valve life by reducing lead and carbon deposits.

Generac does not recommend using any
gasoline containing alcohol (such as “gasohol”).
If you use any gasoline containing alcohol, it
must not contain more than 10 percent ethanol,
and it must be removed from the generator
during storage. Do NOT use any gasoline
containing methanol. If you use gasoline with
alcohol, inspect more frequently for fuel leaks
and other abnormalities.

1.6.2 ENGINE OIL REQUIREMENTS

Use only high quality detergent oil classified “For
Service SF” and with an oil viscosity rating of SAE
10W-30 oil. Do not pour in any additives to the rec­ommended oil. Engine crankcase capacity is 1.4
liters. See Section 3.2 on page 11 for oil level check
and filing procedures.

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1.6.3

GENERATOR SPECIFICATIONS

SERIES PRIMEPACT 66G PRIMEPACT 66LP

Rotor RPM 3600 3600
Rotor Poles 2 2
Engine RPM 2700 2700
Rated Max. Continuous AC Output* 6600 watts (6.6 kW) 6200 watts (6.2 kW)
Voltage* 120 120
Rated Max. Continuous Current* 55.0 AC amps‡ 51.7 AC amps Ñ
Phase 1 1
Frequency 60 Hertz 60 Hertz
Battery Charging Current (Max.) 2 amps (trickle charge) 2 amps (trickle charge)
Weight 213 pounds 216 pounds
Length 25 inches 25.75 inches
Width 18.5 inches 18.5 inches
Height 15.75 inches 15.75 inches

* All units are reconnectable to 120 and/or 240 volts, dual voltage output. Units are not listed per RVIA/ANSI when reconnected for dual voltage output
‡ Rated maximum continuous current at 240 volts is 27.5 amps.
Ñ Rated maximum continuous current at 240 volts is 25.8 amps.

Model No Load 1/2 Load Full Load
PrimePact 66G 0.33 0.59 0.99
PrimePact 66LP 0.47/2.01 0.85/3.62 1.66/7.05

T1

RED

T2

WHITE

T3

BLACK

STATOR WINDINGS

CB1

CB2

GROUNDED NEUTRAL

Generac®Power Systems, Inc. 7

Section 2 – Operation

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

1.6.4 ENGINE SPECIFICATIONS

Type of Engine

PRIMEPACT 66G/66LP ..............................................GN-480

Cooling Method ........................................................Air-cooled

Rated Horsepower

PRIMEPACT 66G/66LP ........................................16 at 3600

Displacement

PRIMEPACT 66G/66LP..................................................480cc

Compression Ratio........................................................8.6 to 1

Cylinder Block ..........................Aluminum w/Cast Iron Sleeve

Type of Governor ..............................Mechanical, Fixed Speed

Engine Governor Speed ............................................2700 rpm

Air Cleaner ........................Paper Element w/Foam Precleaner

Starter ........................................................12-volt DC Electric

Ignition System ......................Solid-state w/Flywheel Magneto

Recommended Spark Plug

Champion ..................................................................RC12YC

AC....................................................................................R45S

Fram Autolite ......................................................................65

Spark Plug Gap........................................0.030 inch (0.8 mm)

Recommended Min. Battery ............400 Cold Cranking Amps

1.6.5 EMISSIONS COMPLIANCE PERIOD

For nonhandled engines the Emissions Compliance
Period referred to on the Emissions Compliance
Label indicates the number of operating hours for
which the engine has been shown to meet Federal
emission requirements.

• For engines less than 225 cc displacement,

Category C=125 hours, B=250 hours, and A=500
hours.

• For engines of 225 cc or more, Category C=250

hours, B=500 hours, and A=1000 hours.

2.1 GENERATOR CONTROL PANEL

The following features are mounted on the generator
control panel (Figure 2.1):

2.1.1 FUEL PRIMER

Before starting a cold engine (if it has not been start­ed in more than two weeks), you must press this
switch for approximately ten seconds to bring fuel
from the tank to the fuel pump. This rocker type
switch springs back into its original position when
you release it.

2.1.2 START/STOP SWITCH

To crank and start the engine, hold this switch in the
START position. Release the switch when the engine
starts. To stop an operating engine, press and hold
the switch in the STOP position until the engine shuts
off. The switch center position is the RUN position.

2.1.3 15 AMP FUSE

The fuse protects the engine’s DC control circuit
against electrical overload. If the fuse element has
melted open due to overloading, the engine cannot be
cranked. If you must replace the fuse, use only an
identical 15 amp replacement fuse.

2.1.4 LINE BREAKERS

Protects generator’s AC output circiut against
overload, i.e., prevents unit from exceeding
wattage/amperage capacity. This unit has two 30-amp
breakers.

Figure 2.1 – Typical Control Panel

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8 Generac®Power Systems, Inc.

Section 2 – Operation

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

NOTE:

If this generator has been reconnected for dual
voltage AC output (120/240 volts), you can install
line breakers having an amperage rating that is
different than that stated above. The replacement
line breakers consist of two separate breakers with
a connecting piece between the breaker handles
(so that both breakers will operate at the same
time). If the unit is reconnected for dual voltage,
it is no longer RVIA listed.

2.2 OPTIONAL REMOTE

START/STOP PANEL

A remote mounted Start/Stop Panel (Figure 2.2) is
available that allows you to start and stop the gener­ator engine conveniently from inside the vehicle. The
remote panel includes a Start/Stop switch, hourme­ter, generator run lamp and a wire harness.

Figure 2.2 — Optional Remote Panel

(Models 004057 and 004184)

2.3 AUTOMATIC CHOKE

This engine is equipped with an automatic choke that
consists of two main components: a choke solenoid
and prechoke.

2.3.1 CHOKE SOLENOID

During engine cranking (Start/Stop switch at
START), a solid-state choke module signals the
choke solenoid to activate and cycle (choke on/choke
off) until the engine starts. The choke solenoid thus
opens and closes the carburetor choke valve only
when the engine is cranking. When the engine starts,
the choke stops cycling.

2.3.2 PRECHOKE

The choke system also has a temperature-sensitive
metal strip that adjusts choke valve angle according
to ambient temperatures (i.e., in cold ambient tem­peratures, choke valve closes more). Once the engine
starts, an element heats the temperature-sensitive
strip to a normal operating condition, opening the
choke valve. This may take about three minutes in
cooler weather.

2.4 BEFORE STARTING THE ENGINE

NOTE:

Instructions and information in this manual
assume the generator has been properly installed,
connected, serviced, tested and adjusted by a
qualified installation technician or installation
contractor.

2.4.1 INSTALLATION

Generator installation must have been properly com­pleted so it complies with all applicable codes, stan­dards and regulations and with the manufacturer's
recommendations.

2.4.2 ENGINE LUBRICATION

Have the engine crankcase properly serviced with the
recommended oil before starting. Refer to Section

1.6.3 (Page 6) and Sections 3.1 and 3.2 (Page 11) for
oil servicing procedures and recommendations.

Any attempt to crank or start the engine before
you have properly serviced it with the recom­mended oil may result in an engine failure.

2.4.3 FUEL SUPPLY

The engine must have an adequate supply of proper
fuel to operate. Before starting it, check that sufficient
fuel is available.

NOTE:

Depending on the installation, the generator may
have either a separate fuel tank, or it may “share”
the vehicle engine’s fuel tank.

2.4.4 COOLING AND VENTILATING AIR

Air inlet and outlet openings in the generator com­partment must be open and unobstructed for contin­ued proper operation. Without sufficient cooling and
ventilating airflow, the engine/generator quickly over­heats, which causes it to shut down and may damage
the generator.

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Generac®Power Systems, Inc. 9

Section 2 – Operation

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

2.4.5 ENGINE EXHAUST GAS

Before starting the generator engine, you should be
sure there is no way for exhaust gases to enter the
vehicle interior and endanger people or animals.
Close windows, doors and other openings in the vehi­cle that, if open, might permit exhaust gases to enter
the vehicle.

The generator engine gives off DEADLY carbon
monoxide gas through its exhaust system. This
dangerous gas, if breathed in sufficient concen­trations, can cause unconsciousness or even
death. Never operate the generator set with
the vehicle inside any garage or other enclosed
area. DO NOT OPERATE THE GENERATOR IF THE
EXHAUST SYSTEM IS LEAKING OR HAS BEEN
DAMAGED. SYMPTOMS OF CARBON MONOX­IDE POISONING ARE (a) inability to think coher­ently; (b) vomiting; (c) twitching muscles; (d)
throbbing temples; (e) dizziness; (f) headaches;
(g) weakness; and (h) sleepiness. IF YOU FEEL
ANY OF THESE SYMPTOMS, MOVE INTO FRESH
AIR IMMEDIATELY. IF SYMPTOMS PERSIST, GET
MEDICAL HELP.

2.5 STARTING THE GENERATOR

NOTE:

Read the vehicle manufacturer’s instructions. The
owner/operator should become familiar with the
vehicle in which this generator is installed.
Differences exist between vehicles. For example,
some vehicles may use a transfer switch to isolate
dockside power from the generator, while other
vehicles may use an isolating receptacle. Some
vehicles may be equipped with a DC converter
which allows the generator to power certain DC
lighting and other DC loads.

To crank and start the generator engine, proceed as
follows:

1. Turn OFF electrical loads using the means pro-

vided in your vehicle (such as a main line circuit
breaker or transfer switch).

NOTE:

If starting from the generator control panel, turn
OFF loads by setting the generator’s main circuit
breaker to the OFF (or open) position. If starting
from a remote panel, turn OFF loads using the
means provided in the vehicle (such as a main cir­cuit breaker). Electrical load circuits will be
turned ON after the generator has started, stabi­lized and warmed up.

2. If you have not started the engine in more than
two weeks, press the Fuel Pump Primer switch
and hold it for about 10 seconds. However, if the
engine is warm, skip Step 2.

3. To crank and start the engine, hold the start/stop
switch at START. Release the switch when the
engine starts.

If the engine does not start after it has been
cranking for 15 seconds, release the Start/Stop
switch and wait 1 minute before trying again.
Holding the switch for longer than 15 seconds
can damage the starter motor.

4. Let the engine run at no-load for a few minutes to
stabilize and warm up.

5. Turn ON electrical loads using the means
provided (such as a main circuit breaker or
transfer switch).

2.6 STOPPING THE GENERATOR

1. Turn OFF all electrical loads using the means
provided (such as a main circuit breaker or
transfer switch).

2. Let generator run at no-load for a few minutes, to
stabilize internal engine generator temperatures.

3. Place the Start/Stop switch in its STOP position.
The engine will come to a complete stop.

2.7 APPLYING LOADS TO GENERATOR

When applying electrical loads to the generator,
observe these guidelines:

• Before applying electrical loads, let the generator

stabilize and warm up for a minute or two.

• DO NOT overload the generator.

2.7.1 LETTING THE ENGINE STABILIZE

The generator supplies correct rated voltage only at
the proper governed speed. Some electrical appli­ances may be extremely sensitive to voltage. Incorrect
voltages can damage such appliances.

If electrical loads are applied at reduced operating
speeds, such loads imposed on the engine when suf­ficient power is not available may shorten engine life.
Never turn ON electrical loads until after the genera­tor engine has started and stabilized at no-load.

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10 Generac®Power Systems, Inc.

Section 2 – Operation

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

2.7.2 DO NOT OVERLOAD THE GENERATOR

You can read the rated wattage/amperage capacity of
your generator on the generator data decal (see
Section 1.1 on Page 4).

Applying electrical loads in excess of the unit’s rated
capacity will cause the engine/generator to automati­cally shut down.

To avoid overloading, add up the wattage of all con­nected electrical lighting, appliance, tool and motor
loads. This total should not be greater than the gen­erator’s rated wattage capacity.

• Most lighting, appliance, tool and motor loads indi­cate their required watts on their nameplate or
data plate. For light bulbs, simply note the wattage
rating of the bulb.

• If a load does not show its rated wattage, multiply
that load’s rated VOLTS times AMPS to obtain
WATTS.

• Induction type motors (such as those that run the
vehicle’s furnace fan, refrigerator, air conditioner,
etc.) need about 2-1/2 times more watts of power
for starting than for running (for a few seconds
during motor starting). Be sure to allow for this
when connecting electrical loads to the generator.
First, figure the watts needed to start electric
motors in the system. To that figure, add the run­ning wattages of other items that will be operated
by the generator.

• Do not apply heavy electrical loads for the first two
or three hours of operation.

2.8 PROTECTION SYSTEMS

2.8.1 LOW OIL PRESSURE SWITCH

This switch (Figure 2.3 on page 10) has normally
open (N.O.) contacts that are held open by engine oil
pressure during cranking and operating. Should oil
pressure drop below a preset level, switch contacts
close, and the engine automatically shuts down. The
unit should not be restarted until oil is added.

2.8.2 HIGH TEMPERATURE SWITCH

This switch (Figure 2.3), which has normally open
(N.O.) contacts, is mounted near the oil filter. The
contacts close if the temperature should exceed
approximately 284º F (140º C), initiating an engine
shutdown.

Figure 2.3 – Low Oil Pressure and

High Temperature Switches

2.8.3 FIELD BOOST

The Controller Circuit Board houses a field boost
diode and resistor that are not part of the automatic
choke circuit. These two components are part of a
“field boost” circuit (Figure 2.4). During engine
cranking only, a positive DC (battery) voltage is deliv­ered through the diode, resistor, brushes and slip
rings, and the generator rotor. Application of this
voltage to the rotor “flashes the field” whenever it is
started. Flashing of the field each time the generator
starts makes sure that a sufficiently strong magnetic
field is available to produce “pickup” voltage in the
stator windings.

Figure 2.4 – Field Boost Circuit

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Generac®Power Systems, Inc. 11

Section 3 – Maintenance

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

2.8.4 OVERVOLTAGE PROTECTION

A solid-state voltage regulator (Figure 2.5) controls
the generator’s AC output voltage. This regulator sup­plies an excitation current to the rotor. By regulating
the rotor’s excitation current, the strength of its mag­netic field is regulated and, in turn, the voltage deliv­ered to connected electrical loads is controlled. When
the AC frequency is 50 Hertz, voltage is regulated at
115 volts.

Figure 2.5 – Solid State Voltage Regulator

The voltage regulator also incorporates a “voltage
surge protection circuit.” This circuit prevents trou­blesome surges in the generator AC output voltage.
Voltage surge is a common cause of damage to elec­tronic equipment.

2.8.5 25-HOUR BREAK-IN PERIOD

The first 25 hours of operation is the break-in period
for the generator. Properly breaking in the generator
is essential to minimize fuel consumption and pro­vide maximum engine performance. During this 25­hour break-in period, follow this procedure:

• Run the unit at varying electrical loads to help seat
the engine piston rings properly.

• Check the engine oil level frequently. Add oil if
needed. It is normal for the generator engine to
consume more oil than is normal until the piston
rings have properly seated.

• For the 75-hour operation following the break-in
period, avoid light electrical loads. Load the
generator at 50 percent (or more) of its rated
wattage capacity. Repeated light loads during these
75 hours can cause improper seating of engine pis­ton rings, resulting in blowby and high oil con­sumption.

• After operating the unit for 25 hours, complete the
tasks recommended under Section 2.8.6.

2.8.6 25-HOUR CHECK-UP

After the 25-hour break-in period, contact a Generac
Authorized Service Dealer for the following mainte­nance. The vehicle owner is responsible for any
charges:

• Change the engine crankcase oil and oil filter.

• Check all fluid levels.

• Inspect the cooling and ventilation openings.

• Check the engine ignition system.

• Inspect the entire electrical system.

• Inspect the engine exhaust system.

2.8.7 OPERATION IN HIGH GRASS
OR BRUSH

Never operate the generator while the vehicle
is parked over high grass, weeds, brush,
leaves or any other combustible substance.
Such materials can ignite and burn from the
heat of the exhaust system. The generator
exhaust system becomes extremely hot dur­ing operation and remains hot for a long time
after it has shut down.

3.1 CHECKING THE ENGINE OIL
LEVEL

For oil capacities and requirements, see “Engine Oil
Requirements,” Section 1.6.2 (Page 6). Check the
engine crankcase oil level at least every eight hours of
operation, or before you use it. To check the engine
oil level, proceed as follows (see Figure 3.1):

1. Be sure the generator is as level as possible.

2. Remove the dipstick and wipe it dry with a clean,

lint-free cloth.

3. Install and tighten the dipstick cap; then, remove

it again. The oil level should be at the dipstick
“Full” mark.

4. If necessary, remove the oil fill cap on the rocker

cover and slowly add oil until it reaches the dip­stick “Full” mark. DO NOT FILL ABOVE THE
“FULL” MARK.

Never operate the engine with the oil level
below the “Add” mark on the dipstick. Doing
this could damage the engine.

5. Install and tighten the oil fill cap and the dipstick

before operating the engine.

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12 Generac®Power Systems, Inc.

Section 3 – Maintenance

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

3.2 CHANGING THE ENGINE OIL
AND/OR OIL FILTER

• Change the engine oil after the first 25 hours of

operation (after the 25-hour break-in period, see
Section 2.8.5, Page 10). Thereafter, change the
oil every 100 operating hours. Change the oil more
frequently if operating consistently under heavy
load or at high ambient temperatures.

• Change the engine oil filter after the first 25 hours

of operation, and every 100 operating hours there­after.

To change the oil and/or oil filter, proceed as
follows:

1. Run the engine until it is thoroughly warmed up

(at least five minutes) then shut OFF
the engine.

2. With the engine still warm from running, remove

the oil drain plug (Figure 3.1). Drain the oil into
a suitable container.

3. After the oil has drained, replace the oil drain

plug. (If only changing the oil, go to step 7.)

4. With the oil drained, remove the old oil filter by

turning it counterclockwise (Figure 3.2 on page 12).

5. Apply a light coating of clean engine oil to the gas-

ket of the new filter.

6. Screw the new filter on by hand until its gasket

lightly contacts the oil filter adapter. Then, tight­en the filter an additional 3/4 to one turn.

7. Remove the dipstick and fill crankcase with the

proper type and amount of recommended oil (see
Section 1.6.2, Page 6). The engine crankcase can
hold about 1.4 liters. DO NOT FILL ABOVE THE
“FULL” MARK.

8. Install and tighten the dipstick before operating

the engine.

9. Start the engine and check for leaks.

NOTE:

Check the oil level and fill to the “FULL” mark after
checking for leaks. The filter will retain some oil.

Figure 3.1 — Oil Dipstick/Fill Tube and

Location of Oil Drain Plug

Figure 3.2 — Engine Oil Filter

3.3 MAINTAINING THE ENGINE
AIR CLEANER

3.3.1 CLEANING THE FOAM PRECLEANER

Clean and re-oil the foam precleaner every three
months or every 25 hours of operation, whichever
occurs first. Service the foam precleaner more fre­quently if operating the generator in extremely dusty
or dirty conditions. Use the following procedure
(Figure 3.3):

1. Turn the knob counterclockwise to loosen.

2. Remove the cover, foam precleaner and paper fil-

ter.

3. Remove the foam precleaner from the cover.

4. Wash the foam precleaner in liquid detergent and

water.

5. Wrap the foam precleaner in a clean cloth and

gently squeeze it dry.

6. Saturate the foam precleaner in clean engine oil.

Gently squeeze it in a clean cloth to remove
excess oil and to distribute oil (DO NOT TWIST).

7. Install the foam precleaner into the cover, fol-

lowed by the paper filter. Tabs at edges of paper

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OIL DIPSTICK

OIL DRAIN PLUG

Section 3 – Maintenance

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

filter must lock into slots on cover.

8. Install the cover, foam precleaner and paper filter.

9. Replace knob to retain the filter in place.

Figure 3.3 – Engine Air Cleaner

3.4 CLEAN AIR INTAKE SCREEN

Clean all foreign material from the air intake screen
(Figure 3.4) at least once every 100 hours of opera­tion. Clean more often if necessary.

Inspect the area around the generator exhaust muf­fler periodically and remove all grass, leaves, dirt,
etc., from this area.

Figure 3.4 – Cleaning Air Intake

3.5 CHECKING THE ENGINE
SPARK PLUG

Clean the spark plug and reset the spark plug gap
every 100 hours of operation.

1. Clean the area around the base of the spark plug

to keep dirt and debris out of the engine. Clean by
scraping or washing using a wire brush and com­mercial solvent. Do not blast the spark plug to
clean.

2. Remove the spark plug and check the condition.

Replace the spark plug if worn or if reuse is ques­tionable.

3. Check the spark plug gap using a wire feeler

gauge. Adjust the gap to 0.030 inch (0.76 mm)
by carefully bending the ground electrode
(Figure 3.5).

Figure 3.5 – Setting the Spark Plug Gap

Sparking can occur if the wire terminal does
not fit firmly on the spark plug terminal end. If
necessary, re-form the wire terminal to obtain a
tight fit.

3.6 FUEL FILTER (GASOLINE ONLY)

Remove and replace the fuel filter (Figure 3.6)
once each year or every 100 hours of operation,
whichever comes first.

Figure 3.6 – Fuel Filter

3.7 SPARK ARRESTOR MUFFLER

If the generator is not equipped with a spark arrestor
exhaust muffler and is to be used on any forest cov­ered, brush covered or grass covered unimproved
land, you may have to install a spark arrestor. The
spark arrestor must be maintained in effective work­ing order by the vehicle owner/operator.

For assistance in ordering, installing and maintaining
spark arrestor exhaust mufflers, contact your nearest
Generac Authorized Service Dealer.

Exhaust mufflers supplied by Generac are spark
arrestor types. Generac exhaust mufflers for recre­ational vehicle generators do not have a spark
arrestor screen, but are of the more efficient “toroid”
or “swirl” type. To remove carbon and combustion
deposits from such mufflers, remove the plug from
the muffler and run the engine for approximately 15
minutes. Shut down the engine, let the muffler cool
and install the plug.

Generac®Power Systems, Inc. 13

PAPER
FILTER

FOAM
PRE-CLEANER

COVER

KNOB

TO FUEL PUMP

CUSTOMER FUEL CONNECTION

FUEL FILTER

14 Generac®Power Systems, Inc.

Be sure to reinstall the muffler plug tightly.
Engine vibration could cause a loose plug to
fall out. Without the plug in place, hot engine
exhaust is directed out the opening. This hot
exhaust, depending on the installation, could
be directed to areas not able to withstand the
extreme heat such as wooden floor boards or
other flammable material. This could result in a
fire.

3.8 CLEANING THE GENERATOR

Keep the generator set as clean and dry as possible.
Protect the unit against excessive dust, dirt, corrosive
vapors, road splash, etc. Permitting dirt and mois­ture to accumulate on generator windings will have
an adverse effect on the insulation resistance of those
windings.

When moisture is allowed to remain in contact with
windings, some of the moisture will be retained in
voids and cracks in the insulation. This causes a
reduced insulation resistance and will eventually
cause problems. Dirt will make the problem worse,
since dirt tends to hold moisture in contact with
windings. Salt (as from sea air) also will worsen the
problem since it tends to absorb moisture from the
air. Salt and moisture, when combined, form a good
electrical conductor.

Do NOT use a forceful spray of water to clean
the generator. Water will enter the generator
interior and cause problems, and may also cont­aminate the generator fuel system.

3.9 BATTERY MAINTENANCE

All lead-acid batteries will discharge when not in use.
The generator battery should be inspected as follows:

3.9.1 WEEKLY

• Inspect the battery posts and cables for tightness

and corrosion. Tighten and clean as necessary.

• Check the battery fluid level of unsealed batteries

and, if necessary, fill with Distilled Water Only. Do
not use tap water in batteries.

3.9.2 EVERY SIX MONTHS

• Have the state of charge and condition checked.

This should be done with an automotive-type bat­tery hydrometer.

NOTE:

Servicing of the battery is to be performed or
supervised by personnel knowledgeable of batter­ies and the required precautions. Keep unautho­rized personnel away from batteries.

Damage will result if the battery connections are
made in reverse.

Do not dispose of the battery in a fire. The
battery is capable of exploding. Storage batter­ies give off explosive hydrogen gas. This gas
can form an explosive mixture around the bat­tery for several hours after charging. The
slightest spark can ignite the gas and cause an
explosion. Such an explosion can shatter the
battery and cause blindness or other injury.
Any area that houses a storage battery must be
properly ventilated. Do not allow smoking,
open flame, sparks, or any spark producing
tools or equipment near the battery. Discharge
static electricity from your body before touch­ing the battery by first touching a grounded
metal surface.

A battery presents a risk of electrical shock
and high short circuit current. The following
precautions are to be observed when working
on batteries:

• Remove watches, rings or other metal objects;

• Use tools with insulated handles;

• Wear rubber gloves and boots;

• Do not lay tools or metal parts on top of the
battery;

• Disconnect any charging source prior to connecting
or disconnecting battery terminals; and

• Do not use any jumper cables or booster battery to
crank and start the generator engine. If any battery
has discharged, remove it for recharging.

Do not open or mutilate the battery. Released
electrolyte has been known to be harmful to
the skin and eyes, and to be toxic.

The electrolyte is a dilute sulfuric acid that is
harmful to the skin and eyes. It is electrically
conductive and corrosive. The following
procedures are to be observed:

• Wear full eye protection and protective clothing;

• Where electrolyte contacts the skin, wash it off
immediately with water;

• Where electrolyte contacts the eyes, flush
thoroughly and immediately with water and seek
medical attention; and

• Spilled electrolyte is to be washed down with an
acid neutralizing agent. A common practice is to
use a solution of 1 pound (500 grams) bicarbonate
of soda to 1 gallon (4 liters) or water. The bicar­bonate of soda solution is to be added until the
evidence of reaction (foaming) has ceased. The
resulting liquid is to be flushed with water and the
area dried.

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Section 3 – Maintenance

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

Generac®Power Systems, Inc. 15

3.10 MAJOR SERVICE MANUAL

To obtain a service manual for your generator, con­tact Generac or your nearest Generac Authorized
Service Dealer. Make sure to identify your MODEL
NUMBER and SERIES.

3.11 DRIVE BELT

The engine drives the generator rotor by means of a
pulley and drive belt arrangement. The drive belt and
pulleys are warranted for the life of the generator.
Drive belt tension was properly adjusted before the
unit was shipped from the factory. If you suspect that
drive belt tension is incorrect, contact a Generac
Authorized Service Dealer.

3.12 EXERCISING THE GENERATOR

Generac recommends that you start and operate the
generator at least once every seven days. Let
the unit run for at least 30 minutes to “exercise”
the engine.

3.13 OUT OF SERVICE PROCEDURE

3.13.1 REMOVAL FROM SERVICE

If you cannot exercise the generator every seven days,
and it is to be out of service longer than 30 days, pre­pare the generator for storage as follows:

1. Start the engine and let it warm up.

2. Close the fuel shutoff valve in the fuel supply line
and allow the unit to shut down.

3. While the engine is still warm from running,
drain the oil completely. Refill the crankcase with
SAE 10W-30 oil having API classification “For
Service SF.”

4. Attach a tag to the engine indicating the viscosity
and classification of the oil in the crankcase.

5. Remove the spark plug and pour two or three
tablespoons of clean, fresh engine oil into the
spark plug threaded openings. Reinstall and
tighten the spark plug.

6. Remove the battery and store it in a cool, dry
room on a wooden board. Never store the battery
on any concrete or earthen floor.

7. Clean and wipe the entire generator.

3.13.2 RETURN TO SERVICE

To return the unit to service after storage, proceed
as follows:

1. Check the tag on the engine for oil viscosity and
classification. Verify that the correct recommend­ed oil is used in the engine (see Section 1.5.4,
Page 6). If necessary, drain and refill with the
proper oil.

2. Check the state of the battery. Fill all cells of
unsealed batteries to the proper level with distilled
water. DO NOT USE TAP WATER IN THE BAT­TERY. Recharge the battery to 100 percent state of
charge, or, if defective, replace the battery.

3. Clean and wipe the entire generator.

4. Reconnect the battery. Observe battery polarity.
Damage may occur if the battery is connected
incorrectly.

5. Turn OFF all electrical loads. Add fuel if neces­sary and then start the engine.

6. Allow the unit to warm up thoroughly.

7. Apply electrical loads to at least 50 percent of the
unit’s rated wattage capacity.

8. When the engine is thoroughly warmed up, shut
it down.

9. Your generator is now ready for service.

3.14 WATTAGE REFERENCE GUIDE

Running Watts

Battery Charger ..................................................500

Belt Sander (3”)................................................1000

Chain Saw ........................................................1200

Circular Saw (6-12”) ............................800 to 1000

Disc Sander (9”) ..............................................1200

Hand Drill (1”) ................................................1100

Hedge Trimmer ..................................................450

Impact Wrench ..................................................500

Lawn Mower ....................................................1200

Electric Range (one element) ............................1500

Television ............................................1750 to 2000

Coffee Maker ....................................................1000

Electric Skillet..................................................1250

Hair Dryer........................................................1200

Light Bulb ..........................................................100

Microwave Oven ................................................700

Oil Burner on Furnace ......................................300

Oil Fired Space Heater (140,000 Btu) ................400

Radio ........................................................50 to 200

Slow Cooker ......................................................200

*Furnace Fan (1/3 HP)......................................1200

*Refrigerator ......................................................600

*Air Conditioner (12,000 Btu)..........................1700

*Compressor (1HP)..........................................2000

*Deep Freeze ......................................................500

*Milk Cooler ....................................................1100

*Submersible Pump (1-1/2 HP)........................2800

*Submersible Pump (1 HP)..............................2000

*Paint Sprayer, Airless (1/3 HP) ........................600

*Table Saw (10”) ................................1750 to 2000

* Allow 2-1/2 times the listed watts for starting these
devices.

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Section 3 – Maintenance

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

16 Generac®Power Systems, Inc.

Section 4 – Notes

PRIMEPACT 66G and 66LP Recreational Vehicle Generators