Generac Power Systems GP Series User manual

GP Series Portable Generator
Owner’s Manual
Register your Generac product at:
WWW.GENERAC.COM
1-888-GENERAC
(1-888-436-3722)
SAVE THIS MANUAL FOR FUTURE REFERENCE
000915
(000209a)
WARNING
This product is not intended to be used in
a critical life support application. Failure to
adhere to this warning could result in
death or serious injury.
MODEL:________________________
SERIAL:________________________
DATE PURCHASED:______________
SAVE THIS MANUAL FOR FUTURE REFERENCE

Table of Contents
Section 1 Introduction and Safety 1
Introduction ..................................... 1
Safety Rules .................................... 1
Safety Symbols and Meanings ........ 1
Exhaust and Location Hazards ....... 2
Electrical Hazards ........................... 3
Fire Hazards .................................... 3
Standards Index .............................. 3
Section 2 General Information and
Setup .............................................. 4
Know Your Generator ..................... 5
Emissions ........................................ 5
Hour Meter ...................................... 6
Connection Plugs ............................ 6
120/240 VAC, 50 Amp receptacle ... 7
Remove Contents from Carton ....... 7
Assembly ......................................... 8
Battery Cable Connection ............... 8
Add Engine Oil ................................ 9
Fuel ................................................. 9
Section 3 Operation .................... 11
Operation and Use Questions ....... 11
Before Starting Engine .................. 11
Prepare Generator for Use ............ 11
Grounding the Generator When Used
as a Portable ................................. 11
Know Generator Limits .................. 12
Transporting/Tipping of the Unit .... 12
Starting Electric Start Engines ...... 13
Automatic Idle Control ................... 13
Cold Weather Operation/De-icer ... 13
Low Oil Level Shutdown System ... 13
Using the 12 VDC Battery Charger 14
Section 4 Maintenance and
Troubleshooting ..........................15
Maintenance ..................................15
Maintenance Schedule ..................15
Preventive Maintenance ...............15
Engine Maintenance ......................15
Battery Replacement (if applicable) 17
Inspect Muffler and Spark Arrester 17
Valve Clearance ............................18
Storage ..........................................18
Troubleshooting .............................19
(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 Portable Generator 1
Section 1 Introduction and Safety
Introduction
Thank you for purchasing a Generac Power
Systems Inc. product. This unit has been
designed to provide high-performance, effi-
cient operation, and years of use when main-
tained properly.
If any section of the manual is not understood,
contact your nearest Independent Authorized
Service Dealer (IASD), or contact Generac
Customer Service at 1-888-GENERAC (1-
888-436-3722), or www.generac.com with any
questions or concerns.
The owner is responsible for proper mainte-
nance and safe use of the equipment. Before
operating, servicing or storing this generator:
• Study all warnings in this manual and on
the product carefully.
• Become familiar with this manual and the
unit before use.
• Refer to the Assembly section of the man-
ual for instructions on final assembly proce-
dures. Follow the instructions completely.
Save these instructions for future reference.
ALWAYS supply this manual to any individual
that will use this machine.
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.
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, there-
fore, not all inclusive. If using a procedure,
work method or operating technique that the
manufacturer does not specifically recom-
mend, 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 generator, DANGER,
WARNING, CAUTION and NOTE blocks are
used to alert personnel to special instructions
about a particular operation that may be haz-
ardous 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 instruc-
tions while performing the action or service
are essential to preventing accidents.
Safety Symbols and Meanings
• If you start to feel sick, dizzy, or weak after
the generator has been running, move to
fresh air IMMEDIATELY. See a doctor, as
you could have carbon monoxide poison-
ing.
(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.
000657
DANGER
Using a generator indoors CAN KILL YOU IN MINUTES.
Generator exhaust contains carbon monoxide. This is
a poison you cannot see or smell.
NEVER use inside a home
or garage, EVEN IF doors
and windows are open.
Only use OUTSIDE and
far away from windows,
doors, and vents.
(000103)
DANGER
Asphyxiation. Running engines produce carbon
monoxide, a colorless, odorless, poisonous gas.
Carbon monoxide, if not avoided,
will result in death or serious injury.

2 Owner’s Manual for Portable Generator
• For safety reasons, it is recommended that
the maintenance of this equipment be per-
formed by an IASD. Inspect the generator
regularly, and contact the nearest IASD for
parts needing repair or replacement.
Exhaust and Location Hazards
• If you start to feel sick, dizzy, or weak after
the generator has been running, move to
fresh air IMMEDIATELY. See a doctor, as
you could have carbon monoxide poison-
ing.
(000179a)
DANGER
The exhaust system must be properly maintained. Do
not alter or modify the exhaust system as to render it
unsafe or make it noncompliant with local codes and/or
standards. 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.
(000116)
DANGER
Electrocution. Turn utility and emergency
power supplies to OFF before connecting power
source and load lines. Failure to do so will result
in death or serious injury.
(000146)
WARNING
Equipment and property damage. Do not alter
construction of, installation, or block ventilation for
generator. Failure to do so could result in unsafe
operation or damage to the generator.
(000178a)
Asphyxiation. Always use a battery operated carbon
monoxide alarm indoors and installed according to
the manufacturer’s instructions. Failure to do so
could result in death or serious injury.
WARNING
(000250)
WARNING
Equipment and property damage. Do not operate unit on
uneven surfaces, or areas of excessive moisture, dirt, dust
or corrosive vapors. Doing so could result in death, serious
injury, property and equipment damage.
(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 operting machine, do not
touch hot surfaces. Keep machine away from
combustables during use. Hot surfaces
could result in severe burns or fire.
(000142)
Do not insert any object through the air cooling slots.
Generator can start at any time and could result in
death, serious injury, and unit damage.
WARNING
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)
WARNING
Injury and equipment damage. Do not use
generator as a step. Doing so could result in falling,
damaged parts, unsafe equipment operation,
and could result in death or serious injury. (000216)
000406
(000103)
DANGER
Asphyxiation. Running engines produce carbon
monoxide, a colorless, odorless, poisonous gas.
Carbon monoxide, if not avoided,
will result in death or serious injury.
(000179a)
DANGER
The exhaust system must be properly maintained. Do
not alter or modify the exhaust system as to render it
unsafe or make it noncompliant with local codes and/or
standards. Failure to do so will result in death
or serious injury.
(000146)
WARNING
Equipment and property damage. Do not alter
construction of, installation, or block ventilation for
generator. Failure to do so could result in unsafe
operation or damage to the generator.
(000178a)
Asphyxiation. Always use a battery operated carbon
monoxide alarm indoors and installed according to
the manufacturer’s instructions. Failure to do so
could result in death or serious injury.
WARNING

Owner’s Manual for Portable Generator 3
Electrical Hazards
• The National Electric Code (NEC) requires
the frame and external electrically conduc-
tive parts of the generator be properly con-
nected to an approved earth ground. Local
electrical codes may also require proper
grounding of the generator. Consult with a
local electrician for grounding requirements
in the area.
• Use a ground fault circuit interrupter in any
damp or highly conductive area (such as
metal decking or steel work).
Fire Hazards
• Do not operate the generator if connected
electrical devices overheat, if electrical out-
put is lost, if engine or generator sparks or if
flames or smoke are observed while unit is
running.
• Keep a fire extinguisher near the generator
at all times.
Standards Index
1. National Fire Protection Association
(NFPA) 70: The NATIONAL ELECTRIC
CODE (NEC) available from www.nfpa.org
2. National Fire Protection Association
(NFPA) 5000: BUILDING CONSTRUC-
TION AND SAFETY CODE available from
www.nfpa.org
3. International Building Code available from
www.iccsafe.org
4. Agricultural Wiring Handbook available
from www.rerc.org, Rural Electricity
Resource Council P.O. Box 309 Wilming-
ton, OH 45177-0309
5. ASAE EP-364.2 Installation and Mainte-
nance of Farm Standby Electric Power
available from www.asabe.org, American
Society of Agricultural & Biological Engi-
neers 2950 Niles Road, St. Joseph, MI
49085
This list is not all inclusive. Check with the
Authority Having Jurisdiction (AHJ) for any
local codes or standards which may be appli-
cable to your jurisdiction.
(000144)
DANGER
Electrocution. Contact with bare wires,
terminals, and connections while generator
is running 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.
(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.
(000130)
WARNING
Accidental Start-up. Disconnect the negative battery
cable, then the positive battery cable when working
on unit. Failure to do so could result in death
or serious injury.
(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.
(000166)
DANGER
Do not overfill fuel tank. Fill to 1/2 in. of top of tank to
allow for fuel expansion. Overfilling may cause fuel to
spill onto engine causing fire or explosion, which will
result in death or serious injury.
(000174)
DANGER
Risk of fire. Allow fuel spills to completely dry
before starting engine. Failure to do so will
result in death or serious injury.
(000142)
Do not insert any object through the air cooling slots.
Generator can start at any time and could result in
death, serious injury, and unit damage.
WARNING

4 Owner’s Manual for Portable Generator
Section 2 General Information and Setup
Figure 2-1. Features and Controls
TABLE 1. Generator Components
Figure 2-2. Control Panel
000920
000921
000919
11
12
10
13
15
16
14
1 12 Volt DC, 10 Amp Receptacle
2 120 Volt AC, 20 Amp Duplex Receptacle
3 120 Volt AC, 20 Amp, GFCI Duplex
Receptacle (NEMA 5-20R)
4 120 Volt AC, 30 Amp Locking Receptacle
(NEMA L14-30R)
5 120/240 Volt AC, 30 Amp Locking
Receptacle (NEMA L14-30R)
6 120/240 Volt AC, 50 Amp Receptacle
(NEMA 14-50R)
7 Circuit Breakers (AC)
8 Hour Meter
9 Idle Control Switch
10 Start/Run/Stop Switch
11 Choke Knob
12 Winter/Summer Valve
13 Fuel Tank
14 Grounding Lug
15 Air Cleaner
16 Oil Fill
17 10 Amp Fuse (behind control panel, not
shown)
000917
7 2 38
4
5
1
76
9

Owner’s Manual for Portable Generator 5
Know Your Generator
Replacement owner’s manuals are available
at www.generac.com.
Emissions
The United States Environmental Protection
Agency (US EPA) (and California Air
Resources Board (CARB), for engines/equip-
ment certified to California standards) requires
that this engine/equipment complies with
exhaust and evaporative emissions stan-
dards. Locate the emissions compliance decal
on the engine to determine applicable stan-
dards. For emissions warranty information,
please reference the included emissions war-
ranty. It is important to follow the maintenance
specifications in the manual to ensure that the
engine complies with the applicable emissions
standards for the duration of the product’s life.
(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.
TABLE 2. Product Specifications
Generator Specifications
Rated Power 15.1 / 17.5 kW**
Surge Power 22.5 / 26.25 KVA
Rated AC Voltage 120/240
Rated AC Load
Current @ 240V
Current @ 120V
62.9 / 72.9 Amps**
125.8 / 145.8 Amps**
Rated Frequency 60 Hz @ 3600 RPM
Phase Single Phase
** Operating Temperature Range: -18 deg. C (0 deg. F) to 40 Deg. C (104 Deg. F). When operated
above 25 deg. C (77 deg. F) there may be a decrease in power.
** Maximum wattage and current are subject to, and limited by, such factors as fuel Btu content, ambi-
ent temperature, altitude, engine condition, etc.. Maximum power decreases about 3.5% for each
1,000 feet above sea level; and will also decrease about 1% for each 6° C (10° F) above 16° C (60°
F) ambient temperature.
Engine Specifications
Displacement 992 cc
Spark Plug Type Champion RC14YC or Equivalent
Spark Plug Part No. 0E7585A
Spark Plug Gap 0.040 inch or (1.016 mm)
Gasoline Capacity 60.5 L (16 U.S. gallons)
Oil Type See Chart in the Add Engine Oil Section
Oil Capacity
With filter change
Without filter change
1.6 L (1.7 qt.)
1.3 L (1.4 qt.)
Run Time at 50% Load 10 Hours
* Go to Generac.com or contact an Authorized Service Dealer for replacement parts.

6 Owner’s Manual for Portable Generator
Hour Meter
The Hour Meter tracks hours of operation for
scheduled maintenance. See Figure 2-3.
• The CHG OIL display will illuminate every
100 hours. The message will flash one hour
before and one hour after each 100 hour
interval, providing a two hour window to
perform service.
• The SVC display will illuminate every 100
hours. The message will flash one hour
before and one hour after each 200 hour
interval providing a two hour window to per-
form service.
When the hour meter is in flash alert mode,
the maintenance message will alternate with
elapsed time in hours and tenths. The hours
will flash four times, then alternate with the
maintenance message four times until the
meter automatically resets.
• 100 hours - CHG OIL — Oil Change Inter-
val (Every 100 hrs)
• 200 hours - SVC — Service Air Filter
(Every 200 hrs)
NOTE: The hour glass icon will flash when the
engine is running. This signifies the meter is
recording hours of operation.
Figure 2-3. Hour Meter
Connection Plugs
120 VAC, 20 Amp, Duplex
Receptacle
The 120 Volt outlet is overload protected by a
20 Amp push-to-reset circuit breaker. See Fig-
ure 2-4. Each receptacle will power 120 Volt
AC, single phase, 60 Hz electrical loads
requiring up to 2400 watts (2.4 kW) or 20
Amps of current. Use only high quality, well-
insulated, 3-wire grounded cord sets rated for
125 Volts at 20 Amps (or greater).
Figure 2-4. 120 VAC, 20 Amp, Duplex
Receptacle NEMA 5-20R
120 VAC, 20 Amp, GFCI Duplex
Receptacle
The 120 Volt outlet is overload protected by a
20 Amp push-to-reset circuit breaker. See Fig-
ure 2-5. Each receptacle will power 120 Volt
AC, single phase, 60 Hz electrical loads
requiring up to 2400 watts (2.4 kW) or 20
Amps of current. Use only high quality, well-
insulated, 3-wire grounded cord sets rated for
125 Volts at 20 Amps (or greater). It also pro-
vides protection with a Ground Fault Circuit
Interrupter with a press to TEST and RESET
button.
Figure 2-5. 120 VAC, 20 Amp, GFCI Duplex
Receptacle NEMA 5-20R
120/240 VAC, 30 Amp Receptacle
Use a NEMA L14-30 plug with this receptacle
(rotate to lock/unlock). Connect a suitable 4-
wire grounded cord set to plug and desired
load. The cord set should be rated 250 Volts
AC at 30 Amps (or greater). See Figure 2-6.
Use this receptacle to operate 120 Volt AC, 60
Hz, single phase loads requiring up to 3600
watts (3.6 kW) of power at 30 Amps or 240
Volt AC, 60 Hz, single phase loads requiring
up to 7200 watts (7.2 kW) of power at 30
Amps. The outlet is protected by two 30 Amp
push button to reset circuit breaker.
0000.0
000205
000424
000203

Owner’s Manual for Portable Generator 7
Figure 2-6. 120/240 VAC, 30 Amp Receptacle
NEMA L14-30R
120 VAC, 30 Amp Receptacle
Use a NEMA L5-30 plug with this receptacle
(rotate to lock/unlock). Connect a suitable 3-
wire cord set to the plug and to desired load.
The cord set should be rated for 125 Volts AC
at 30 Amps (or greater). See Figure 2-7.
Use this receptacle to operate 120 Volt AC,
60Hz, single phase loads requiring up to 3600
watts (3.6kW) of power at 30 Amps. The outlet
is protected by a 30 Amp push-to-reset circuit
breaker.
Figure 2-7. 120 VAC, 30 Amp Receptacle
NEMA L5-30
120 Volt DC, 10 Amp Receptacle
This receptacle can charge a 12-Volt automo-
tive or utility style storage battery. See Figure
2-8.
NOTE: This receptacle cannot charge 6-volt
batteries and cannot be used to crank an
engine having a discharged battery. See
Using the 12 VDC Battery Charger before
attempting to charge a battery.
Figure 2-8. 120 Volt DC, 10 Amp Receptacle
120/240 VAC, 50 Amp receptacle
Use a NEMA 14-50 plug with this receptacle.
Connect a 4-wire cord set rated for 250 Volts
AC at 50 Amps to plug Figure 2-9.
Use this receptacle to operate 120/240 Volt
AC, 60 Hz electrical loads requiring up to
12,000 watts (12.0 kW) of power. This recep-
tacle is protected by a 50 Amp 2-pole circuit
breaker.
Figure 2-9. 120/240 VAC, 50 Amp Receptacle
NEMA 14-50
Remove Contents from Carton
1. Open carton completely by cutting each
corner from top to bottom.
2. Remove and verify carton contents prior to
assembly. Carton contents should contain
the following:
TABLE 3. Accessories
000204
000844
000923
Item Qty.
Main Unit 1
Owner’s Manual 1
Liter Oil SAE 30 2
Handle (A) 1
Never-flat Wheel (B) 2
Frame Foot Assembly (C) 1
Axle (D) 1
Axle Bracket Assembly (E) 2
Spark Plug 2
Spark Plug Wrench 1
Air Filter 1
Oil Filter 1
Pre-cleaner 1
Battery Charge Cable 1
Product Registration Card 3
Service Warranty 1
Emissions Warranty 1
000924

8 Owner’s Manual for Portable Generator
3. Call Generac Customer Service 1-888-
GENERAC (1-888-436-3722) with the unit
model and serial number for any missing
carton contents.
4. Record model, serial number, and date of
purchase on front cover of this manual.
Assembly
Call Generac Customer Service at 1-888-
GENERAC (1-888-436-3722) for any assem-
bly issues or concerns. Please have model
and serial number available.
The following tools are required to install the
accessory kit.
• Needle nose pliers
• 9/16” and 1/2” socket and ratchet
•1/2”wrench
NOTE: The wheels are not intended for over-
the-road use.
See Figure 2-10.
Install wheels as follows:
1. Slide axle (D) through the flat washer (L)
spacer (G), wheel (B), and axle bracket
assembly (E) on frame.
2. Insert cotter pin (F) through axle (D). Bend
tabs (of cotter pins) outward to lock into
place.
3. Install locking flange nut (H).
Install frame foot assembly as follows:
1. Slide hex head bolts (J) through holes in
frame rail.
2. Slide frame foot (C) onto hex head bolts
(J). Install locking flange nut (H).
3. Slide capscrew (M) through frame foot
assembly (C). Install lock washer (K), flat
washer (L) and locking flange nut (H).
Install handle as follows:
1. Slide capscrew (N) through flat washer (L),
handle (A) and frame. Install flat washer
(L) and locking flange nut (H).
.
Figure 2-10. Wheel & Handle Assembly
Battery Cable Connection
The battery shipped with the generator has
been provided fully charged. Caution must be
taken when connecting battery.
NOTE: A battery may lose some of it’s charge
when not in use for prolonged periods of time.
Two 7/16” box wrenches are needed to con-
nect battery cables.
1. Cut tie wrap cable holding the RED and
BLACK battery cables to the stator.
2. Connect RED battery cable (A) to battery
Positive terminal (+). Make sure connec-
tion is tight and slip rubber boot over termi-
nal.
3. Connect BLACK battery cable (B) to bat-
tery Negative terminal (–). Make sure con-
nection is tight.
4. Install battery post cover (included). See
Figure 2-11.
Figure 2-11. Battery Connection
Hardware Bag Qty.
Cotter Pin (F) 2
Spacer (G) 2
Locking Flange Nut (H) 10
Hex Head Bolt (J) 6
Lock Washer (K) 2
Flat Washer (L) 8
Capscrew (5/16 x 1) (M) 2
Capscrew (5/16 x 2-1/2) (N) 4
(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.
000925
N
A
EG
F
L
D
J
H
K
B
M
C
H
L
L
L
(000167)
CAUTION
Do not make battery connections
in reverse. Doing so will result in
equipment damage.
003482
AB

Owner’s Manual for Portable Generator 9
Add Engine Oil
1. Place generator on a level surface.
2. Remove dipstick and wipe clean. See Fig-
ure 2-12.
Figure 2-12. Remove Dipstick
3. Insert dipstick and remove again to check
oil level. Oil level is checked with dipstick
fully installed. See Figure 2-13.
Figure 2-13. Safe Operating Range
4. Clean area around oil fill. Remove oil fill
cap. See Figure 2-14.
Figure 2-14. Remove Oil Fill Cap
5. Add recommended engine oil. Climate
determines proper engine oil viscosity.
See chart to select correct viscosity.
NOTE: Use petroleum based oil (supplied) for
engine break-in before using synthetic oil.
.
NOTE: Some units have more than one oil fill
location. It is only necessary to use one oil fill
point.
6. Remove dipstick and verify oil level is
within safe operating range. See Figure 2-
13.
7. Install dipstick and oil fill cap and hand-
tighten.
Fuel
Fuel requirements are as follows:
• Clean, fresh, unleaded gasoline.
• Minimum rating of 87 octane/87 AKI (91
RON).
• Up to 10% ethanol (gasohol) is acceptable
(where available; non-ethanol-premium fuel
is recommended).
• DO NOT use E85.
• DO NOT use a gas oil mix.
• DO NOT modify engine to run on alternate
fuels. Stabilize fuel prior to storage.
1. Verify unit is OFF and cooled for a mini-
mum of two minutes prior to fueling.
2. Place unit on level ground in a well venti-
lated area.
3. Clean area around fuel cap and remove
cap slowly.
4. Slowly add recommended fuel (A). Do not
overfill (B). See Figure 2-15.
5. Install fuel cap.
(000135)
CAUTION
Engine damage. Verify proper type and quantity of
engine oil prior to starting engine. Failure to do so
could result in engine damage.
003639
003653
003640
SAE 30
10W-30
Synthetic 5W-30
000399
(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.
(000166)
DANGER
Do not overfill fuel tank. Fill to 1/2 in. of top of tank to
allow for fuel expansion. Overfilling may cause fuel to
spill onto engine causing fire or explosion, which will
result in death or serious injury.

10 Owner’s Manual for Portable Generator
Figure 2-15. Add Recommended Fuel
NOTE: Allow spilled fuel to evaporate before
starting unit.
IMPORTANT NOTE: It is important to pre-
vent gum deposits from forming in fuel
system parts such as the carburetor, fuel
hose or tank during storage. Alcohol-
blended fuels (called gasohol, ethanol or
methanol) can attract moisture, which
leads to separation and formation of acids
during storage. Acidic gas can damage the
fuel system of an engine while in storage.
To avoid engine problems, the fuel system
should be emptied before storage of 30
days or longer. See the Storage section.
Never use engine or carburetor cleaner
products in the fuel tank as permanent
damage may occur.
000927
A B

Owner’s Manual for Portable Generator 11
Section 3 Operation
Operation and Use Questions
Call Generac customer service at 1-888-GEN-
ERAC (1-888-436-3722) with questions or
concerns about equipment operation and
maintenance.
Before Starting Engine
1. Verify engine oil level is correct.
2. Verify fuel level is correct.
3. Verify unit is secure on level ground, with
proper clearance and is in a well ventilated
area.
Prepare Generator for Use
Grounding the Generator When
Used as a Portable
The generator is equipped with a terminal for
the connection of a grounding electrode sys-
tem. Article 250.34 (A) does not require the
frame of the generator to be connected to a
grounding electrode system when the genera-
tor only supplies power to cord and plug con-
nected equipment through the receptacles on
the generator.
When the generator supplies power to a 3-
pole manual transfer switch or distribution
panel boards for temporary power, a ground-
ing electrode system shall be installed and
connected to the grounding electrode terminal
on the generator. See NEC 250.30, 250.34
and 250.52 for clarification. See Figure 3-1.
• Neutral Bonded to Frame
Figure 3-1.Grounding the Generator
Special Requirements
Review all Federal or State Occupational
Safety and Health Administration (OSHA) reg-
ulations, local codes, or ordinances that apply
to the intended use of the generator.
Consult a qualified electrician, electrical
inspector, or the local agency having jurisdic-
tion:
• In some areas, generators are required to
be registered with local utility companies.
• If the generator is used at a construction
site, there may be additional regulations
which must be observed.
Connecting the Generator to a
Building Electrical System
When connecting directly to a building electri-
cal system, it is recommended that a manual
transfer switch be used. Connections for a
portable generator to a building electrical sys-
tem must be made by a qualified electrician
and in strict compliance with all national and
local electrical codes and laws.
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
(000179a)
DANGER
The exhaust system must be properly maintained. Do
not alter or modify the exhaust system as to render it
unsafe or make it noncompliant with local codes and/or
standards. Failure to do so will result in death
or serious injury.
(000178a)
Asphyxiation. Always use a battery operated carbon
monoxide alarm indoors and installed according to
the manufacturer’s instructions. Failure to do so
could result in death or serious injury.
WARNING
WARNING
(000118a)
Risk of fire. Do not use generator without
spark arrestor installed. Failure to do so
could result in death or serious injury.
(000110)
WARNING
Risk of Fire. Hot surfaces could ignite
combustibles, resulting in fire. Fire 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.
(000136)
CAUTION
Equipment and property damage. Disconnect electrical
loads prior to starting or stopping unit. Failure to do so
could result in equipment and property damage.
000928

12 Owner’s Manual for Portable Generator
Know Generator Limits
Overloading a generator can result in damage
to the generator and connected electrical
devices. Observe the following to prevent
overload:
• Add up the total wattage of all electrical
devices to be connected at one time. This
total should NOT be greater than the gener-
ator's wattage capacity.
• The rated wattage of lights can be taken
from light bulbs. The rated wattage of tools,
appliances, and motors can be found on a
data label or decal affixed to the device.
• If the appliance, tool, or motor does not
give wattage, multiply volts times ampere
rating to determine watts (volts x amps =
watts).
• Some electric motors, such as induction
types, require about three times more watts
of power for starting than for running. This
surge of power lasts only a few seconds
when starting such motors. Make sure to
allow for high starting wattage when select-
ing electrical devices to connect to the gen-
erator:
1. Figure the watts needed to start the largest
motor.
2. Add to that figure the running watts of all
other connected loads.
The Wattage Reference Guide is provided to
assist in determining how many items the gen-
erator can operate at one time.
NOTE: All figures are approximate. See data
label on appliance for wattage requirements.
Table 3. Wattage Reference Guide
Transporting/Tipping of the Unit
Do not operate, store or transport the unit at
an angle greater than 15 degrees.
Device Running
Watts
*Air Conditioner (12,000 Btu) 1700
*Air Conditioner (24,000 Btu) 3800
*Air Conditioner (40,000 Btu) 6000
Battery Charger (20 Amp) 500
Belt Sander (3") 1000
Chain Saw 1200
Circular Saw (6-1/2") 800 to 1000
*Clothes Dryer (Electric) 5750
*Clothes Dryer (Gas) 700
*Clothes Washer 1150
Coffee Maker 1750
*Compressor (1 HP) 2000
*Compressor (3/4 HP) 1800
*Compressor (1/2 HP) 1400
Curling Iron 700
*Dehumidifier 650
Disc Sander (9") 1200
Edge Trimmer 500
Electric Blanket 400
Electric Nail Gun 1200
Electric Range (per element) 1500
Electric Skillet 1250
*Freezer 700
*Furnace Fan (3/5 HP) 875
*Garage Door Opener 500 to 750
Hair Dryer 1200
Hand Drill 250 to 1100
Hedge Trimmer 450
Impact Wrench 500
Iron 1200
*Jet Pump 800
Lawn Mower 1200
Light Bulb 100
Microwave Oven 700 to 1000
*Milk Cooler 1100
Oil Burner on Furnace 300
Oil Fired Space Heater (140,000
Btu)
400
Oil Fired Space Heater (85,000 Btu) 225
Oil Fired Space Heater (30,000 Btu) 150
*Paint Sprayer, Airless (1/3 HP) 600
Paint Sprayer, Airless (hand-held) 150
Radio 50 to 200
*Refrigerator 700
Slow Cooker 200
*Submersible Pump (1-1/2 HP) 2800
*Submersible Pump (1 HP) 2000
*Submersible Pump (1/2 HP) 1500
*Sump Pump 800 to 1050
*Table Saw (10") 1750 to 2000
Television 200 to 500
Toaster 1000 to 1650
Weed Trimmer 500
* Allow 3 times the listed watts for starting these
devices.

Owner’s Manual for Portable Generator 13
Starting Electric Start Engines
1. Unplug all electrical loads from the unit's
receptacles before starting the engine.
2. Place generator on a level surface.
3. Open the fuel shut-off valve. See Figure 3-
2.
.
Figure 3-2.Fuel Shut-off Valve
4. On the control panel, turn the idle control
switch Off. See Figure 2-2.
5. Move engine choke knob outward to Full
Choke. See Figure 3-3.
Figure 3-3.Choke Position
6. Press and hold Start/Run/Stop switch in
the Start position. When engine starts,
release the switch to the RUN position.
7. When engine starts, move choke knob to
1/2 choke position until engine runs
smoothly, then fully to RUN position. If
engine falters, move choke knob back to
1/2 choke position until engine runs
smoothly, then move to RUN position.
IMPORTANT NOTE: Do not overload the
generator. Also, do not overload individual
panel receptacles. These outlets are pro-
tected against overload with push-to-reset
type circuit breakers. If amperage rating of
any circuit breaker is exceeded, that
breaker opens and electrical output to that
receptacle is lost. Read “Don’t Overload
the Generator” carefully.
Generator Shut Down
1. Shut off all loads and unplug electrical
loads from generator panel receptacles.
2. Turn Off idle control switch.
3. Let engine run at no-load for several min-
utes to stabilize internal temperatures of
engine and generator.
4. Move Start/Run/Stop switch to Stop.
5. Close fuel valve.
NOTE: Under normal conditions, close fuel
valve and allow generator to run carburetor
bowl out of fuel. For emergencies, switch to
Stop.
Automatic Idle Control
This feature will improve fuel economy. When
the switch is turned On, the engine will only
run at its normal fast governed engine speed
when electrical load is connected. When load
is removed, the engine will run at a reduced
speed. With the switch Off, the engine runs
continuously at normal fast engine speed.
Always have the switch Off when starting
and stopping the engine.
Cold Weather Operation/De-icer
Under certain weather conditions (tempera-
tures below 40 °F (4 °C) and a high dew
point), the engine may experience icing of the
carburetor and/or the crankcase breather sys-
tem. To eliminate this problem, the generator
engine is fitted with a winter/summer valve.
This directs hot air into the carburetor during
cold weather operation. Always make sure the
winter/summer valve is in the correct location
relative to weather condition.
Low Oil Level Shutdown System
The engine is equipped with a low oil pressure
sensor that shuts down the engine automati-
cally when the oil pressure drops below a
specified level. The engine will not run until
the oil has been filled to the proper level.
If the engine shuts down and there is sufficient
fuel, check engine oil level.
(000136)
CAUTION
Equipment and property damage. Disconnect electrical
loads prior to starting or stopping unit. Failure to do so
could result in equipment and property damage.
000929
000930
(000136)
CAUTION
Equipment and property damage. Disconnect electrical
loads prior to starting or stopping unit. Failure to do so
could result in equipment and property damage.

14 Owner’s Manual for Portable Generator
Using the 12 VDC Battery
Charger
The 12 VDC receptacle may be used to
recharge 12 VDC automotive batteries only.
The DC charging output is not regulated. The
circuit protector does not prevent over-
charging a battery.
1. Connect the charging cable to the genera-
tor first, then the battery. ALWAYS connect
the red lead to positive (+), and the black
to negative (-).
2. Start generator and use as normal.
Charging time will vary with battery size
and condition. Check voltage at battery
terminals once the charging cable has
been unplugged, or generator has been
shut down.
NOTE: This receptacle cannot recharge 6 Volt
batteries and cannot be used to crank an
engine having a discharged battery.
(000137a)
WARNING
(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.
(000138a)
WARNING
(000167)
CAUTION
Do not make battery connections
in reverse. Doing so will result in
equipment damage.

Owner’s Manual for Portable Generator 15
Section 4 Maintenance and Troubleshooting
Maintenance
Regular maintenance will improve perfor-
mance and extend engine/equipment life.
Generac Power Systems, Inc. recommends
that all maintenance work be performed by an
Independent Authorized Service Dealer
(IASD). Regular maintenance, replacement,
or repair of the emissions control devices and
systems may be performed by any repair shop
or person of the owner’s choosing. To obtain
emissions control warranty service free of
charge, the work must be performed by an
IASD. See the emissions warranty.
NOTE: Call 1-888-GENERAC (1-888-436-
3722) with questions about component
replacement.
Maintenance Schedule
Follow maintenance schedule intervals,
whichever occurs first according to use.
NOTE: Adverse conditions will require more
frequent service.
NOTE: All required service and adjustments
should be each season as detailed in the fol-
lowing chart.
Preventive Maintenance
Dirt or debris can cause improper operation
and equipment damage. Clean generator
daily or before each use. Keep area around
and behind muffler free from combustible
debris. Inspect all cooling air openings on
generator.
• Use a damp cloth to wipe exterior surfaces
clean.
• Use a soft bristle brush to loosen caked on
dirt, oil, etc.
• Use a vacuum to pick up loose dirt and
debris.
• Low pressure air (not to exceed 25 psi)
may be used to blow away dirt. Inspect
cooling air slots and openings on generator.
These openings must be kept clean and
unobstructed.
NOTE: DO NOT use a garden hose to clean
generator. Water can enter engine fuel system
and cause problems. If water enters generator
through cooling air slots, some water will be
retained in voids and crevices of rotor and sta-
tor winding insulation. Water and dirt buildup
on generator internal windings will decrease
insulation resistance of windings.
Engine Maintenance
Engine Oil Recommendations
To maintain the product warranty, the engine
oil should be serviced in accordance with the
recommendations of this manual. For your
convenience, maintenance kits designed and
intended for use on this product are available
from the manufacturer that include engine oil,
oil filter, air filter, spark plug(s), a shop towel
and funnel. These kits can be obtained from
an Independent Authorized Service Dealer
(IASD).
.
At Each Use
Check engine oil level
Every 100 Hours or Every Season*
Change oil ǂ
Every Season
Replace spark plug
Check valve clearance***
Every 200 Hours or Every Season
Inspect/clean air filter**
ǂChange oil after first 30 hours of operation,
then every season.
* Change oil and oil filter every month when
operating under heavy load or in high tem-
peratures.
** Clean more often under dirty or dusty oper-
ating conditions. Replace air filter parts if
they cannot be adequately cleaned.
*** Check valve clearance and adjust if neces-
sary after first 50 hours of operation and
every 100 hours thereafter.
(000142)
Do not insert any object through the air cooling slots.
Generator can start at any time and could result in
death, serious injury, and unit damage.
WARNING
(000141)
WARNING
Accidental start-up. Disconnect spark plug wires
when working on unit. Failure to do so could result
in death or serious injury.
SAE 30
10W-30
Synthetic 5W-30
000399

16 Owner’s Manual for Portable Generator
Inspect Engine Oil Level
Inspect engine oil level prior to each use, or
every 8 hours of operation.
1. Place generator on a level surface.
2. Remove dipstick and wipe clean. See Fig-
ure 4-1.
Figure 4-1. Remove Dipstick
3. Insert dipstick and remove again to check
oil level. Oil level is checked with dipstick
fully installed. See Figure 4-2.
Figure 4-2. Safe Operating Range
4. Add recommended engine oil as neces-
sary.
5. Replace oil fill cap and hand-tighten.
NOTE: Some units have more than one oil fill
location. It is only necessary to use one oil fill
point.
Change Engine Oil
When using generator under extreme, dirty,
dusty conditions, or in extremely hot weather,
change oil more frequently.
NOTE: Don’t pollute. Conserve resources.
Return used oil to collection centers.
Change oil while engine is still warm from run-
ning, as follows:
1. Place generator on a level surface.
2. Disconnect the spark plug wire from the
spark plug and place the wire where it
cannot contact spark plug.
3. Clean area around oil fill, and oil drain
plug.
4. Remove oil fill cap.
5. Remove oil drain plug and drain oil com-
pletely into a suitable container.
6. Install oil drain plug and tighten securely.
7. Coat gasket of new filter with clean engine
oil and install.
8. Slowly pour oil into oil fill opening until oil
level is between L and H marks on dip-
stick. DO NOT overfill.
9. Install oil fill cap, and finger tighten.
10. Wipe up any spilled oil.
11. Properly dispose of oil in accordance with
all applicable regulations.
Air Filter
Engine will not run properly and may be dam-
aged if run with a dirty air filter. Service air fil-
ter more frequently in dirty or dusty conditions.
To service air filter:
1. Turn knobs (A) and remove air filter cover
(B). See Figure 4-3.
2. Remove wing nut (C) and filter (D). Gently
tap filter on a solid surface. Replace if nec-
essary.
3. Clean air filter cover before installation.
NOTE: To order a new air filter, contact the
nearest authorized service center at 1-888-
436-3722.
Figure 4-3. Air Filter Assembly
(000139)
WARNING
Risk of burns. Allow engine to cool before
draining oil or coolant. Failure to do so
could result in death or serious injury.
003639
003653
(000141)
WARNING
Accidental start-up. Disconnect spark plug wires
when working on unit. Failure to do so could result
in death or serious injury.
000933
A
B
C
D

Owner’s Manual for Portable Generator 17
Service Spark Plug
To service spark plug:
1. Clean area around spark plug.
2. Remove and inspect spark plug.
3. Inspect electrode gap with wire feeler
gauge and reset spark plug gap to 0.04 in
(1.01 mm). See Figure 4-4.
Figure 4-4. Spark Plug
NOTE: Replace spark plug if electrodes are
pitted, burned or porcelain is cracked. Use
ONLY recommended replacement plug. See
Specifications.
4. Install spark plug finger tight, and tighten
an additional 3/8 to 1/2 turn using spark
plug wrench.
Battery Replacement (if
applicable)
NOTE: The battery shipped with the generator
has been fully charged. A battery may lose
some charge when not in use for prolonged
periods of time.
See Figure 4-5.
1. Disconnect negative (-) battery terminal
FIRST (B).
2. Disconnect positive (+) battery terminal
SECOND (A).
Figure 4-5. Battery Connection
3. Install new battery. Install hold down
bracket and tighten.
4. Connect positive (+) battery terminal (A)
FIRST. Slide rubber boot over connection
hardware.
5. Connect negative (-) battery terminal (B)
SECOND.
6. Slide rubber boot over connection hard-
ware.
Inspect Muffler and Spark
Arrester
NOTE: It is a violation of California Public
Resource Code, Section 4442, to use or oper-
ate the engine on any forest-covered, brush-
covered, or grass-covered land unless the
exhaust system is equipped with a spark
arrester, as defined in Section 4442, main-
tained in effective working order. Other states
or federal jurisdictions may have similar laws.
Contact original equipment manufacturer,
retailer, or dealer to obtain a spark arrester
designed for exhaust system installed on this
engine.
NOTE: Use ONLY original equipment replace-
ment parts.
Inspect muffler for cracks, corrosion, or other
damage. Remove spark arrester, if equipped,
inspect for damage or carbon blockage.
Replace parts as required.
Inspect Spark Arrester Screen
(CARB models)
1. See Figure 4-6. Remove screw (A) and
retaining bracket (B).
2. Remove screen (C) and replace if torn,
perforated or otherwise damaged. If
screen is not damaged, clean with com-
mercial solvent.
3. Replace screen and secure with bracket
and screw.
Figure 4-6. Spark Arrestor Screen
000211
(000130)
WARNING
Accidental Start-up. Disconnect the negative battery
cable, then the positive battery cable when working
on unit. Failure to do so could result in death
or serious injury.
003482
AB
(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.
000934
A
B
C

18 Owner’s Manual for Portable Generator
Valve Clearance
IMPORTANT NOTE: If uncomfortable about
doing this procedure, or the proper tools
are not available, take generator to the
nearest service center to have valve clear-
ance adjusted.
Check valve clearance after the first fifty-hours
of operation. Adjust as necessary.
• Intake — 0.05 to 0.1mm (cold), (0.002" to
0.004" inches)
• Exhaust — 0.05 to 0.1mm (cold) (0.002" to
0.004" inches)
Storage
General
It is recommended to start and run the genera-
tor for 30 minutes, every 30 days. If this is not
possible, refer to the following list to prepare
unit for storage.
• DO NOT place a storage cover on a hot
generator. Allow unit to cool to room tem-
perature before storage.
• DO NOT store fuel from one season to
another unless properly treated.
• Replace fuel container if rust is present.
Rust in fuel will cause fuel system prob-
lems.
• Cover unit with a suitable protective, mois-
ture resistant cover.
• Store unit in a clean and dry area.
• Always store generator and fuel away from
heat and ignition sources.
Prepare Fuel System for Storage
Fuel stored over 30 days can go bad and
damage fuel system components. Keep fuel
fresh, use fuel stabilizer.
If fuel stabilizer is added to fuel system, pre-
pare and run engine for long term storage.
Run engine for 10-15 minutes to circulate sta-
bilizer throughout fuel system. Adequately
prepared fuel can be stored up to 24 months.
NOTE: If fuel has not been treated with fuel
stabilizer, it must be drained into an approved
container. Run engine until it stops from lack
of fuel. Use of fuel stabilizer in fuel storage
container is recommended to keep fuel fresh.
1. Change engine oil.
2. Remove spark plug.
3. Pour tablespoon (5-10cc) of clean engine
oil or spray a suitable fogging agent into
cylinder.
4. Push start button several times to distrib-
ute oil in cylinder.
5. Install spark plug.
Change Oil
Change engine oil before storage. See
Change Engine Oil.
(000143)
DANGER
Explosion and Fire. Fuel and vapors are extremely
flammable and explosive. Store fuel in a well
ventilated area. Keep fire and spark away. Failure
to do so will result in death or serious injury.
(000109)
WARNING
Risk of Fire. Verify machine has properly
cooled before installing cover and storing
machine. Hot surfaces could result in fire.
(000181)
WARNING
Vision Loss. Eye protection is required to avoid
spray from spark plug hole when cranking engine.
Failure to do so could result in vision loss.