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XP18HP
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S
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R
M
A
N
U A
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REV: XP18HP_rev06172022
5800 Ontario Mills Pkwy
This manual provides information regarding the
Ontario, CA 91764 USA
operation and maintenance of these products. We
www.duromaxpower.com
have made every effort to ensure the accuracy of the
Call our Customer Care Team Toll Free 8-5pm PST Mon-Fri
information in this manual. We reserve the right to
844-DUROMAX
change this product at any time without prior notice.
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Summary of Contents for DUROMAX XP18HP
- Page 1 XP18HP REV: XP18HP_rev06172022 5800 Ontario Mills Pkwy This manual provides information regarding the Ontario, CA 91764 USA operation and maintenance of these products. We www.duromaxpower.com have made every effort to ensure the accuracy of the Call our Customer Care Team Toll Free 8-5pm PST Mon-Fri information in this manual.
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Page 3: Table Of Contents
CONTENTS Introduction Introduction ........................6 General Safety Procedures .................... 8 Unit and Purchase Information................... 12 Engine Components ..................... 13 Package Contents ......................14 Engine Setup Adding Oil ........................16 Adding Gasoline ......................17 Starting the Engine Check the Oil ......................... 20 Check the Fuel Level ..................... - Page 4 CONTENTS Troubleshooting ......................51 Warranty .......................... 54 Customer service ......................58 For more information and resources on this model scan the QR code below to link to our website product information page.
- Page 6 DUROMAX 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 DUROMAX FOR WORK DUROMAX FOR PLAY Electricity in our home not...
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Page 7: Introduction
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. -
Page 8: General Safety Procedures
GENERAL SAFETY PROCEDURES 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. Please familiarize yourself with the following safety symbols and words: ●... - Page 9 WARNING: This engine may emit highly flammable and explosive gasoline vapors, which can cause severe burns or even death. A nearby open flame can lead to an explosion even if not directly in contact with gasoline. ● Do not operate near an open flame. ●...
- Page 10 GENERAL SAFETY PROCEDURES (CONTINUED) In addition to the above safety notices, please familiarize yourself with the safety and hazard markings on the engine. 1.5”...
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Page 12: Unit And Purchase Information
UNIT AND PURCHASE INFORMATION Serial Number Serial number The serial number is located on the engine block, to the left of the oil fill. Serial number format The serial number will be shown in two parts. The engine model, followed by the serial number. Engine Model: _____________________________________________ Serial Number: _____________________________________________ STAPLE RECEIPT HERE... -
Page 13: Engine Components
ENGINE COMPONENTS 1. Air Filter 3. Fuel Tank 5. Recoil Handle 6. Start Switch 7. Muffler 8. Engine Shaft 2. Carburetor 9. Oil Fill 4. Recoil Starter 10. Oil Drain Plug 1. Air Filter - A removable, cleanable, oiled, element that cleans the air going into the engine. 2. -
Page 14: Package Contents
PACKAGE CONTENTS Your engine comes with the items listed below. Please check to see that all of the following items are included with your engine. Spark Plug Wrench Oil Funnel Used in spark plug Used to add oil to the engine maintenance, inspection, and without messy spills. -
Page 15: Engine Setup
ENGINE SETUP Proper setup of your engine will get you going as soon as possible while making sure you and your equipment are safe and cared for. -
Page 16: Adding Oil
. You must add the proper amount of oil before operating the engine for the first time. This amount is equal to the oil capacity of the engine crankcase: Model Number XP18HP Engine Oil Capacity 37.2 fl. oz (1.1 L) WARNING: Do not apply engine oils with additives or 2-stroke gasoline engine oils;... -
Page 17: Adding Gasoline
Slowly add unleaded gasoline to the fuel tank. Be careful not to overfill. Replace fuel cap and wipe up any spilled gasoline with a dry cloth. Model Number XP18HP Gas Tank Capacity 1.7 US Gal. (6.4L) DANGER DO NOT OVERFILL 1.5”... -
Page 19: Starting The Engine
STARTING THE ENGINE If this is not your first time using the engine there are still steps you should take to prepare it for operation each time you use it. IMPORTANT: At this point you should be familiar with the procedures described in the first portion of this section entitled “ENGINE SETUP”... -
Page 20: Check The Oil
(see “Adding Oil” portion of the “Maintenance” section). Be sure to replace the cap when finished checking oil. Model Number XP18HP Engine Oil Capacity 37.2 fl. oz (1.1L) -
Page 21: Check The Fuel Level
Step 2 - Check the Fuel Level Check fuel level Before starting your engine, check to see that there is sufficient gasoline in the fuel tank. The gasoline level should always be under the red fuel level indicator located on the bottom of the fuel filter cup. -
Page 22: Starting The Engine
STARTING THE ENGINE (CONTINUED) Starting the Engine Move fuel valve to ON The gas valve is located above the carburetor bowl. Move the gasoline fuel valve lever all the way to the right-hand position to allow gasoline to flow to the engine carburetor. Move choke lever to ON The choke lever is located above the gas valve. - Page 23 Pull the recoil start handle Pull the recoil handle slowly until resistance is felt, then quickly pull the recoil handle until fully extended. Continue this step until the engine starts as needed. CAUTION: Release the recoil handle only after the cord has retracted.
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Page 25: Maintenance And Care
MAINTENANCE AND CARE Proper maintenance and storage of your engine is essential to ensure trouble free use of your engine when you need it. By following the maintenance and care requirements, you can keep your engine running smooth and efficient for years to come. -
Page 26: Maintenance Schedule
MAINTENANCE AND CARE Proper routine maintenance of your generator is essential for safe, economical, and trouble-free operation. It will also help reduce air pollution. WARNING: Improper maintenance, or failure to correct a problem before operation, can cause a malfunction in which you can be seriously injured or killed. Always follow the inspection, maintenance recommendations, and schedules in this instruction manual. -
Page 27: Break-In Period
Break-In Period As the best practice for any new combustion motor it’s recommended to perform the break in procedure as follows: ● Run the engine for the first 6-8 hours on conventional oil, then change the oil. After the break-in period synthetic oil may be used. ●... -
Page 28: Checking The Oil
(see “Adding Oil” portion of the “Maintenance” section). The oil will be visible in the oil fill spout when full. Be sure to replace the cap when finished checking oil. Model Number XP18HP Engine Oil Capacity 37.2 fl. oz (1.1 L) -
Page 29: Changing The Oil
Changing the Oil CAUTION: Worn out or dirty oil does not cool the engine properly and can lead to catastrophic engine damage. In addition to regular oil changes, it is necessary to drain the oil from the crankcase if it has become contaminated with water or dirt. -
Page 30: Changing The Air Filter
Remove old filter element Remove the wing nut on top of the air filter element and slide filter element off center bolt. This filter is paper and is not reusable. Please call 1-844-DUROMAX to order a replacement filter for your engine. - Page 31 Replace new filter element Slide new filter element over center bolt, and replace wing nut. Tighten wing nut hand tight to keep filter in place. Replace filter cover Replace plastic air filter cover over the air filter base. Secure filter cover Fasten the air filter cover with the air filter cover wing nut and tighten about hand tight.
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Page 32: Spark Plug Maintenance
MAINTENANCE AND CARE (CONTINUED) Spark Plug Maintenance The spark plug is important for proper engine operation. SPARK PLUG A good spark plug should be intact, free of deposits, and CONSULT MANUAL properly gapped. BEFORE REMOVING CAUTION: Improper maintenance may cause reduced fuel economy, misfires, trouble starting, or damage to the spark plug threads. - Page 33 Measure plug gap Measure the plug gap with a gauge. The gap should be 0.7-0.8 mm (0.028-0.031 in). Clean and re-gap If you are re-using the spark plug, use a wire brush to clean any dirt from around the spark plug base and then re-gap the spark plug.
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Page 34: Emptying The Gas Tank
MAINTENANCE AND CARE (CONTINUED) Emptying the Gas Tank If you have been using gasoline in your engine, before storing your engine for extended periods of time you should drain your engine fuel tank of gasoline. CAUTION: Do not store fuel from one season to another. - Page 35 Turn fuel valve ON and drain Turn the fuel valve to “ON” and allow gasoline to drain into the container until the gas tank is empty. Shut fuel valve OFF Once the gasoline is fully drained, move the fuel valve back to the “OFF”...
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Page 36: Storing The Engine For Same Day Use
MAINTENANCE AND CARE (CONTINUED) Storing the Engine for Same Day Use Run the engine Allow the engine to run for 3-5 minutes. Turn engine switch to OFF Move the engine switch to the “OFF” position to shut the engine off. Store engine After the engine shuts off and cools, then you can store the engine. -
Page 37: Storing The Engine For Use Within 30 Days
Storing the Engine for Use Within 30 Days Run the engine Allow the engine to run for 3-5 minutes. Shut fuel valve OFF and run dry Shut the fuel valve “OFF” and allow engine to run until it stalls out. Turn the engine switch OFF Move the engine switch to the “OFF”... -
Page 38: Storing The Engine For Longer Than 30 Days
MAINTENANCE AND CARE (CONTINUED) Storing the Engine for Longer Than 30 Days Run the engine Allow the engine to run for 3-5 minutes. Shut fuel valve OFF and run dry Shut the fuel valve “OFF” and allow engine to run until it stalls out. - Page 39 Remove spark plug Remove spark plug as shown in “Spark Plug Maintenance” on page 32. Add oil to cylinder Add 2 tablespoons of 10W-30 motor oil directly into the spark plug hole, and pull the recoil to lubricate cylinder. After lubricating cylinder reinstall the spark plug as shown in “Spark Plug Maintenance”...
- Page 41 SPECIFICATIONS A quick reference to useful information on your new DuroMax engine, please see this section for more details on this engine’s specifications.
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Page 43: Specifications
SPECIFICATIONS Displacement 439cc Fuel Type ≥87 octane, ≤10% ethanol, unleaded gasoline Dry Weight 77 lbs Maximum Torque 27 ft. lb @ 2500 RPM Compression Ratio 8.5:1 Bore X Stroke 92 mm x 66 mm Engine Oil Capacity 37.2 oz. Fuel Tank Capacity 1.7 Gal. -
Page 44: Adjustment, Torque, And Timing Specifications
SPECIFICATIONS (CONTINUED) Adjustment, Torque, and Timing Specifications Adjustment Specification Spark Plug Clearance .027-.031 in. (0.7-0.8 mm) Spark Plug Type F6RTC (Torch), F6TC (Torch), BPR6ES (NGK), RN9YC (Champion), WR7DC (Bosch), W20EPR-U (Denso) Valve Clearance (Cold) Intake: .006 in ± .001 in. (0.15mm ± 0.02mm) Exhaust: .008 in ±... -
Page 45: Engine Diagrams
Engine Diagrams 4X3/8-16 UNC-2B 71.5 71.5 4X5/16-24 UNF-2B 44.7 44.7 44.7 Ø146 -0.063 58.4 44.7 58.4... - Page 46 SPECIFICATIONS (CONTINUED) 4X3/8-16 UNC-2B CRANKCASE COVER EDGE 71.5 71.5 4X5/16-24 UNF-2B 88.5 R12.7 +0.05 44.7 44.7 0.5 ~ 1.5 0.5 ~ 1.5 R0.1 ~ R0.35 C0.1 ~ 0.35 BOTH 60˚ SIDES 44.7 Ø146 -0.063 58.4 44.7 58.4 Ø25.4 -0.025 137.8 144.5 2XØ8 HOLE DEPTH 8...
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Page 47: Wiring Diagram
Wiring Diagram... - Page 49 TROUBLESHOOTING This section of the manual is to help you troubleshoot problems with your engine.
- Page 51 TROUBLESHOOTING Mode Description Solution Engine switch is “OFF” Set engine switch to “ON” Fuel valve is “OFF” Turn fuel valve to “ON” Choke is open Close the choke Engine is out of fuel Add fuel Engine will not start Fuel is old or contaminated Change fuel Spark plug is dirty Clean spark plug...
- Page 53 WARRANTY This section of the manual is to help you understand your warranty.
- Page 54 OEM parts. Warranty Limitations DuroMax Power Equipment does not claim or hold any obligation to loss of time, freight charges, use of product, or any incidental damages from the use of this product. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED.
- Page 55 As the small off-road engine owner, you should be aware that the DuroMax Power Equipment may deny you warranty coverage if your small off-road engine or a part has failed due to abuse, neglect, or improper maintenance or unapproved modifications.
- Page 56 The use of any non-exempted add-on or modified parts will be grounds for disallowing a warranty claim made in accordance with this Article. DuroMax Power Equipment will not be liable under this Article to warrant failures of warranted parts caused by the use of an add-on or modified part.
- Page 57 17. Canister Mounting Brackets 18. Carburetor Purge Port Connector * Note: As they relate to the evaporative emission control system. DuroMax Power Equipment will furnish with each new engine written instructions for the maintenance and use of the engine by the owner...
- Page 58 CUSTOMER SERVICE DuroMax Power Equipment is committed to ensuring that our products perform when they need to. Our generators are your lifeline in the event of an emergency. Should you have any problems, please contact our customer service department: DUROMAX POWER EQUIPMENT...
- Page 60 5800 Ontario Mills Parkway Ontario, CA 91764 United States 844-DUROMAX REV: XP18HP_rev06172022...
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