DUROMAX XP18HP User manual

This manual provides information regarding the
operation and maintenance of these products. We
have made every effort to ensure the accuracy of the
information in this manual. We reserve the right to
change this product at any time without prior notice.
5800 Ontario Mills Pkwy
Ontario, CA 91764 USA
www.duromaxpower.com
Call our Customer Care Team Toll Free 8-5pm PST Mon-Fri
844-DUROMAX
REV: XP18HP_rev06172022
XP18HP
USER MANUAL

CONTENTS
1. Introduction .................................................................................................................... 6
General Safety Procedures............................................................................................ 8
Unit and Purchase Information................................................................................... 12
Engine Components ..................................................................................................... 13
Package Contents ......................................................................................................... 14
Introduction
4. Maintenance Schedule................................................................................................. 26
Break-In Period ............................................................................................................. 27
Maintenance Log........................................................................................................... 27
Checking the Oil ............................................................................................................ 28
Changing the Oil............................................................................................................ 29
Changing the Air Filter.................................................................................................. 30
Spark Plug Maintenance .............................................................................................. 32
Emptying the Gas Tank ................................................................................................ 34
Storing the Engine for Same Day Use ........................................................................ 36
Storing the Engine for Use Within 30 Days................................................................ 37
Storing the Engine for Longer Than 30 Days............................................................. 38
Maintenance and Care
3. Check the Oil ................................................................................................................. 20
Check the Fuel Level ..................................................................................................... 21
Starting the Engine ....................................................................................................... 22
Starting the Engine
2.
Adding Oil ...................................................................................................................... 16
Adding Gasoline ............................................................................................................ 17
Engine Setup
5. Specications................................................................................................................. 43
Adjustment, Torque, and Timing Specications ....................................................... 44
Engine Diagrams........................................................................................................... 45
Wiring Diagram ............................................................................................................. 47
Specications

For more information and resources on this model scan the QR
code below to link to our website product information page.
CONTENTS
7. .......................................................................................................................... 54
Warranty
8. ......................................................................................................... 58
Customer service
6. Troubleshooting
...........................................................................................................51

5
...........................................................................................................51

6
THE DUROMAX WAY
The DuroMax Way is more than just a brand, it is our understanding and appreciation of just how
important power can be to someone without it…
DUROMAX FOR HOME
Electricity in our home not
only provides comfort but
safety as well. From keeping
the heat or A/C on to keeping
our food cold, power is
essential to our daily lives.
Inevitability when disaster
strikes and we are left without
power for a prolonged period
of time, our way of life is
put at risk. This is by far the
most critical time for reliable
portable power.
DUROMAX FOR WORK
On the job site, portable
power allows you the ability
to get work done in remote
locations when traditional
power sources are usually
unavailable. Equipment like
table saws, sanders, and
work lights are a necessity
and portable power can
play a critical role in getting
a job done successfully and
eciently.
DUROMAX FOR PLAY
Camping outdoors in a
remote location can get one
in touch with nature and allow
them to forget the stress of
the day to day grind. Here
portable power can provide
comfort as well as safety. With
portable power, you can keep
your cell phone charged, light
up your campsite, or even
brew a cup of coee, all while
being miles from civilization.
The DuroMax Way is a commitment to excellence. This vision is focused on the quality, reliability,
and durability of our products combined with outstanding customer service. We understand that
having dependable power whenever and wherever you need it provides comfort, safety, and peace
of mind. It is through this philosophy that DuroMax achieves our vision of...

7
INTRODUCTION
DuroMax Power Equipment is headquartered in Ontario, California and is the industry’s leader in
Dual Fuel portable generator technology. In addition to a full assortment of portable generators
ranging from digital inverters to large 15,000-watt portable standby units, their product line
includes pressure washers, engines, pumps, and accessories.
The foundation of our company is built on quality, reliability, durability, and customer service. At
DuroMax our vision is simple, we are committed to Powering Everyone... Anywhere!
STOP
Please do not return
to the store.
DuroMax representatives are ready to help you
with any questions, concerns, or issues about your
new product. We can guide you through assembly,
start up, and how to operate your new generator.
We want you to be able to put your new generator
to use right away!
CALL US BEFORE YOU CONSIDER
RETURNING THE PRODUCT!
1-844-DUROMAX
TOLL-FREE
Engines that are certied to comply with U.S. EPA emission regulations for SORE (Small o Road
Equipment), are certied to operate on regular unleaded gasoline and may include the following
emission control systems: (EM) Engine Modications and (TWC) Three-Way Catalyst (if so equipped).
Notice Regarding Emissions

88
DANGER:This engine produces poisonous carbon monoxide gas when running. This gas
is both odorless and colorless. Even if you do not see or smell gas, carbon monoxide may
still be present. Breathing this poison can lead to headaches, dizziness, drowsiness, and
eventually death.
●Use outdoors ONLY in non-conned areas.
●Keep several feet of clearance on all sides to allow proper ventilation of the engine.
WARNING: The exhaust from this product contains chemicals known to the State of
California to cause cancer, birth defects, or other reproductive harm.
WARNING: This engine produces heat when running. Temperatures near exhaust can
exceed 150°F (65°C).
●Do not touch hot surfaces. Pay attention to warning labels on the engine denoting hot
parts of the machine.
●Allow engine to cool several minutes after use before touching engine or areas which
heat during use.
GENERAL SAFETY PROCEDURES
Please familiarize yourself with the following safety symbols and words:
●DANGER: Indicates a hazard that will result in serious injury or death if instructions are not
followed.
●WARNING: Indicates a strong possibility of causing serious injury or death if instructions are not
followed.
●CAUTION: Indicates a possibility of personal injury or equipment damage if instructions are not
followed.
SAFETY ALERT SYMBOL
The safety alert symbol is used with one of the safety words (DANGER,
WARNING, or CAUTION) to alert you of hazards. Please pay attention to
these hazard notices both in this manual and on the engine.

9
WARNING: This engine may emit highly ammable and explosive gasoline vapors, which
can cause severe burns or even death. A nearby open ame can lead to an explosion
even if not directly in contact with gasoline.
●Do not operate near an open ame.
●Do not smoke near the engine.
●Always operate on a rm, level surface.
●Always turn the engine o before refueling.
●Allow engine to cool for at least 2 minutes before removing the fuel cap. Loosen cap
slowly to relieve pressure in the tank.
●Do not overll the gas tank. Gas may expand during operation. Do not ll to the top
of the tank.
●Always check for spilled gas before operating.
●Empty the gasoline tank before storing or transporting the engine.
●Before transporting, turn the fuel valve to the o position and disconnect
the spark plug.

In addition to the above safety notices, please familiarize
yourself with the safety and hazard markings on the
engine.
GENERAL SAFETY PROCEDURES (CONTINUED)
1.5”
10