DUROMAX HYBRID II XP4850EH User manual

XP4850EH GENERATOR
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
User Manual
*Gasoline & Propane Tank Not Included
REV: XP4850EH-05192020

CONTENTS
1.
Introduction .................................................................................................................... 6
General Safety Procedures ........................................................................................... 8
Unit and Purchase Information................................................................................... 12
Carbon Monoxide Safety ............................................................................................ 13
Introduction
4.
Checking the Oil ........................................................................................................... 34
Check the Gas Level ..................................................................................................... 35
Starting the Generator Using Gasoline ...................................................................... 36
Starting the Generator Using Propane....................................................................... 38
Starting the Generator Using Recoil Start ................................................................. 42
Starting the Generator
3.
Shipping Braces ............................................................................................................ 25
Wheel Kit Installation.................................................................................................... 26
Connect the Battery .................................................................................................... 28
Adding Oil ...................................................................................................................... 29
Adding Gasoline ............................................................................................................ 30
Grounding the Generator ........................................................................................... 31
High Altitude Operation .............................................................................................. 31
Generator Setup
5.
AC Usage ........................................................................................................................ 46
Connecting a Load to the Generator.......................................................................... 48
DC Usage........................................................................................................................ 50
Using the Generator
2.
Quick Start Guide (Gasoline) ....................................................................................... 16
Quick Start Guide (Propane)........................................................................................ 18
Generator Components............................................................................................... 20
Package Contents ......................................................................................................... 22
Quick Start

CONTENTS
6.
7.
8.
Maintenance Schedule.................................................................................................. 54
Maintenance Log ........................................................................................................... 55
Checking the Oil ............................................................................................................ 56
Changing the Oil............................................................................................................. 57
Cleaning the Air Filter .................................................................................................... 58
Spark Plug Maintenance ............................................................................................... 60
Emptying the Gas Tank ................................................................................................. 62
Cleaning the Fuel Filter Cup.......................................................................................... 64
Storage and Transportation ......................................................................................... 65
Specications.................................................................................................................. 66
.......................................................................................................................... 76
Basic Troubleshooting .................................................................................................. 68
Changing / Inspecting the Carbon Brushes ............................................................... 69
Changing / Inspecting the AVR .................................................................................... 71
Wiring Diagram ............................................................................................................. 74
Maintenance and Care
Warranty
Troubleshooting
9. .................................................................................................. 80
Contact Information

6
The DuroMax Way is a commitment to excellence. This vision is focused on the quality, reliabil-
ity, 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...
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.

7
INTRODUCTION
Notice Regarding Emissions
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).

8
SAFETY ALERT SYMBOL
DANGER:This generator 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 generator.
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 generator 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 generator denoting
hot parts of the machine.
●Allow generator to cool several minutes after use before touching engine or areas
which heat during use.
The safety alert symbol is used with one of the safety words (DANGER,
CAUTION, or WARNING) to alert you of hazards. Please pay attention to
these hazard notices both in this manual and on the generator.
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.

9
WARNING: This generator 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 generator.
●Always operate on a rm, level surface.
●Always turn the generator o before refueling.
●Allow generator 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 generator.
●Before transporting, turn the fuel valve to the o position and disconnect
the spark plug.
WARNING:This generator produces a powerful voltage, which can result in electrocution.
●ALWAYS ground the generator before using it (see the “Grounding the Generator”
portion of the “PREPARlNG THE GENERATOR FOR USE section).
●The generator should only be plugged into electrical devices, either directly or with
an extension cord. NEVER connect to a building electrical system without a qualied
electrician. Such connections must comply with local electrical laws and codes. Failure
to comply can create a back-ow of power, which may result in serious injury or death
to utility workers.
●Use a ground fault circuit interrupter (GFCI) in highly conductive areas such as metal
decking or steelwork. GFCls are available in-line with some extension cords.
●Do not use uncovered in rainy or wet conditions.
●Do not touch bare wires or receptacles (outlets).
●Do not allow children or non-qualied persons to operate.

In addition to the above safety notices, please familiarize
yourself with the safety and hazard markings on the
generator.
GENERAL SAFETY PROCEDURES
DANGER
DO NOT OVERFILL
THE GAS TANK
OVERFILLING CAN RESULT
IN A FIRE, EXPLOSION,
OR DEATH.
1.5”
10

DON’T TOUCH
CAUTION HIGH TEMPERATURE
DANGER HOT EXHAUST
KEEP SAFE DISTANCE
DON’T TOUCH
BURN RISK CARBON MONOXIDE SAFE DISTANCE
11

Serial Number
Serial number format
STAPLE RECEIPT HERE
The serial number will be shown in two parts. The engine
model, followed by the serial number.
Engine Model: _____________________________________________
Serial Number: _____________________________________________
A purchase receipt may be necessary for warranty parts or
service in the future. If you have a paper receipt staple it
here for easy reference.
If you purchased the unit online, save the email receipt
where you can access it, and record your details here for
convenience in the future.
Purchase Date: ____________________________________________
Order Number: ____________________________________________
Retailer Name: _____________________________________________
Serial Number
The serial number is located on the engine block, above and
to the left of the oil ll.
UNIT AND PURCHASE INFORMATION
12

As the only safe way to use a portable generator, taking your
generator outside is absolutely mandatory to keep your family
safe from carbon monoxide. But there’s even more you can do.
By educating yourself about all carbon monoxide risks, you’ll
be better prepared to protect your family from this colorless,
odorless threat. Visit takeyourgeneratoroutside.com for more
information.

QUICK START
The Quick Start of your generator is the minimum necessary setup that will get you going as soon
as possible. Be sure to read the instructions starting on pg. 25 for full setup instructions.
15

Remove shipping braces
The shipping braces prevent engine movement during
shipment. Flip the generator over and remove the brightly
colored braces between the motor and the frame, and the
wood brace under the generator.
1.
16
Add gasoline
The fuel cap is located on top of the fuel tank. Fill the tank
with fresh unleaded gasoline 87 octane or higher. The tank
is full when you see fuel in the bottom of the fuel lter cup.
DO NOT overll the tank.
3.
Turn gas valve on
The gas valve is located above the recoil start on the
bottom of the fuel tank. Rotate the valve counterclockwise
to the vertical position to turn on the gas supply.
5.
Add oil
The oil ll cap is located on the lower engine block to the
right of the recoil start housing. Remove the oil ll cap and
ll with 20 oz of 10w30 oil.
2.
Turn breaker o
The breaker is located on the right side of the front power
panel. Flip the breaker down to prevent accidental load
when starting the generator.
4.
Remove shipping braces
1.
QUICK START GUIDE (GASOLINE)

17
Open choke
The choke lever is located above the air lter to the left
of the recoil start. Slide the lever to the right to open the
choke and increase air into the carburetor for normal
running.
8.
Connect devices
Connect your devices to the receptacles on the front panel.
Start with the largest loads rst.
10.
Start generator
The switch is located on the left side of the front power
panel. Press the switch up to the start position to start the
generator. Allow the switch to return to the run position
once started.
7.
Turn breaker on
The breaker is located on the right side of the front power
panel. Flip the breaker up to allow the power to ow to the
receptacles.
9.
Close choke
The choke lever is located above the air lter to the left
of the recoil start. Slide the lever to the left to cut the air
supply and allow more gas into the engine to start.
6.

QUICK START GUIDE (PROPANE)
Remove shipping braces
The shipping braces prevent engine movement during
shipment. Flip the generator over and remove the brightly
colored braces between the motor and the frame, and the
wood brace under the generator.
1.
18
Turn breaker o
The breaker is located on the right side of the front power
panel. Flip the breaker down to prevent accidental load
when starting the generator.
3.
Connect propane hose
The propane regulator / decompression valve is located on
the left side of the front panel. Ensure the propane hose
is securely connected to the regulator/compression valve.
5.
Turn the gas valve o
The gas valve is located above the recoil start on the
bottom of the fuel tank. Rotate the valve clockwise to
the horizontal position to stop the ow of gasoline to the
carburetor.
4.
Add oil
The oil ll cap is located on the lower engine block to the
right of the recoil start housing. Remove the oil ll cap and
ll with 20 oz of 10w30 oil.
2.

Connect propane tank
Screw the open ACME nut connection to your propane
tank and turn the tank on.
6.
19
Close choke
The choke lever is located above the air lter to the left
of the recoil start. Slide the lever to the left to cut the air
supply and allow more fuel into the engine to start.
Turn breaker on / connect
The breaker is located on the right side of the front power
panel. Flip the breaker up to allow the power to ow to the
receptacles. Connect your devices to the receptacles on
the front panel. Start with the largest loads rst.
10.
7.
Open choke
The choke lever is located above the air lter to the left
of the recoil start. Slide the lever to the right to open the
choke and increase air into the carburetor for normal
running.
9.
Start generator
The engine switch is located on the left side of the front
power panel. Press the top “Start” position on the rocker
switch to start the generator. Allow the switch to return to
the run position once started.
8.

GENERATOR COMPONENTS
20
1. Recoil Start – Easy Pull Recoil Start to start the engine without the electric start.
2. Air Cleaner - A removable, cleanable, oiled, element that cleans the air going into the engine.
3. Choke Lever - Restricts the airow into the carburetor to assist in starting the engine.
4. Fuel Valve - On/O valve that allows gasoline to the fuel switch.
5. Fuel Tank - All metal 4 Gallon gasoline fuel tank.
6. Power Panel - Contains the start switch, plugs, meters, and circuit breakers.
7. Handles - Allow easy movement across any surface.
8. Battery - 12V DC Battery that powers the Electric Start System.
9. Oil Fill and Dipstick - Use to add or check the oil.
10. Propane Inlet - Provides a regulated LPG Fuel supply to the engine. (Intended for use with an
LPG Source of 11 in. H2O or more.)
11. Low Oil Alert – Will light only if the generator shuts down due to low oil.
12. Voltmeter – Displays current voltage available.
5. Fuel Tank
2. Air Cleaner
7. Handles
8. Battery
9. Oil Fill and Dipstick
1. Recoil Start
6. Power Panel
4. Fuel Valve
3. Choke Lever