Wen GN400i Instruction Manual
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Wen GN400i Instruction Manual

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MODEL GN400i
4000-WATT
INVERTER GENERATOR
Instruction Manual
EPA III CERTIFIED
NEED HELP? CONTACT US!
Have product questions? Need technical support? Please feel free to contact us:
1-800-232-1195 (M-F 8AM-5PM CST)
TECHSUPPORT@WENPRODUCTS.COM
IMPORTANT: Your new tool has been engineered and manufactured to WEN's highest standards for dependability,
ease of operation, and operator safety. When properly cared for, this product will supply you years of rugged,
trouble-free performance. Pay close attention to the rules for safe operation, warnings, and cautions. If you use
your tool properly and for its intended purpose, you will enjoy years of safe, reliable service.
WENPRODUCTS.COM
For replacement parts and the most up-to-date instruction manuals, visit

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  • Page 1 1-800-232-1195 (M-F 8AM-5PM CST) TECHSUPPORT@WENPRODUCTS.COM IMPORTANT: Your new tool has been engineered and manufactured to WEN’s highest standards for dependability, ease of operation, and operator safety. When properly cared for, this product will supply you years of rugged, trouble-free performance. Pay close attention to the rules for safe operation, warnings, and cautions. If you use your tool properly and for its intended purpose, you will enjoy years of safe, reliable service.

  • Page 2: Table Of Contents

    CONTENTS WELCOME Specifications ....................3 Introduction ..................... 4 SAFETY Safety Information ................... 5 Generator Safety Warnings ................6 BEFORE OPERATING Unpacking & Packing List ................8 Assembly & Adjustments ................10 Know Your Generator ..................11 Generator Preparation ..................13 OPERATION &...

  • Page 3: Welcome

    SPECIFICATIONS CONTENTS GENERATOR Model Number GN400i Surge (Starting) Wattage 4000 Watts Rated (Running) Wattage 3500 Watts Rated Voltage 120V AC Rated Amperage 26.6A Phase Single Frequency 60Hz Product Weight 66.1 lbs Product Dimensions 19.8 in. × 13.8 in. × 18.9 in.

  • Page 4: Introduction

    INTRODUCTION Thanks for purchasing the WEN 4000-Watt Portable Generator. Refer to the illustration below for the location of the serial number on the side of the engine. Record the generator information in the spaces provided below. If as- sistance for information or service is required, please contact customer service by calling 1-800-232-1195, M-F 8-5 CST;...

  • Page 5: Safety

    WEN reserves the right to change this product and specifications at any time without prior notice. At WEN, we are continuously improving our products. If you find that your tool does not exactly match this manual, please visit wenproducts.com for the most up-to-date manual or contact customer service at 1-800-232-1195, M-F 8-5 CST.

  • Page 6: Generator Safety Warnings

    GENERATOR SAFETY WARNINGS DANGER: CARBON MONOXIDE Using a generator indoors CAN KILL YOU IN MINUTES. Generator exhaust contains carbon monoxide (CO). This is a poison gas you cannot see or smell. If you can smell the generator exhaust, you are breathing CO. But even if you cannot smell the exhaust, you could be breathing CO.
  • Page 7 GENERATOR SAFETY WARNINGS WARNING! Do not let comfort or familiarity with the product replace strict adherence to product safety rules. Failure to follow the safety instructions may result in serious personal injury. OPERATING ENVIRONMENT 3. If any part of the generator, electrical device or power cord is broken, damaged, or defective, make 1.

  • Page 8: Before Operating

    GENERATOR SAFETY WARNINGS WARNING! Do not let comfort or familiarity with the product replace strict adherence to product safety rules. Failure to follow the safety instructions may result in serious personal injury. TO MAXIMIZE THE LIFESPAN OF YOUR GENERATOR: We recommend running your generator at least once a month for 20 to 30 minutes.
  • Page 9 UNPACKING & PACKING LIST PACKING LIST Components Spark Plug Wrench Wrench (1) Handle (1) Tools Generator (1) Wrench Funnel 8mm/10mm (1) High Altitude Kits Main Jet (1) Main Jet (1) Bolt Seal (1) Bolt Seal (1) Fuel Cup Seal (1) Fuel Cup Seal (1) 3000 - 6000 ft High Altitude Kit (1) 6000 - 8000 ft High Altitude Kit (1)

  • Page 10: Assembly & Adjustments

    ASSEMBLY & ADJUSTMENTS HIGH ALTITUDE OPERATION ABOVE 3000 FEET WARNING! To prevent serious injury from The fuel system on this generator may be affected by op- fire, follow the kit installation procedures in a eration at high altitudes. Proper operation can be ensured well-ventilated area away from ignition sources.

  • Page 11: Know Your Generator

    KNOW YOUR GENERATOR KNOW YOUR GENERATOR Refer to the following diagrams to become familiarized with all the parts and controls of your generator. The components will be referred to later in the manual for assembly and operation instructions. GENERATOR Fuel Gauge Fuel Cap Muffler Fuel Valve...
  • Page 12 KNOW YOUR GENERATOR CONTROL PANEL CHOKE PARALLEL CONNECT OVERLOAD RESET NEMA 5-20R OUTPUT • OVERLOAD • OIL ENGINE SWITCH DC 5V USB 2.1A AC 120V ECO-MODE STOP NEMA L5-30R CIRCUIT BREAKER AC 120V GROUND 1. AC 120V NEMA L5-30R Receptacle 7.

  • Page 13: Generator Preparation

    GENERATOR PREPARATION The following section describes the necessary steps to prepare the generator for use. If you are unsure about how to perform any of the steps please call 1-800-232-1195 (M-F 8-5 CST) for customer service. Failure to perform these steps properly can damage the generator or shorten its life. STEP 1 - ADD/CHECK OIL The generator is shipped without oil.
  • Page 14 (or when you can see the oil coming halfway up the oil fill threads). See Fig. 6. TIP: Your WEN generator is compatible with the OIL LEVEL SHUTDOWN WEN 55201 Magnetic Oil Dipstick (not included), To protect the unit from damage, the generator is equipped available for purchase at wenproducts.com.
  • Page 15 GENERATOR PREPARATION TO ADD GASOLINE: Fig. 7 1. Place the generator on a level surface. Make sure the Fuel Gauge engine is OFF before adding or checking the fuel. 2. Unscrew the fuel cap (Fig. 7) and set it aside. The fuel cap may be tight and hard to unscrew.

  • Page 16: Operation & Maintenance

    STARTING YOUR GENERATOR Before starting the generator, make sure you have read and performed the steps in the “Generator Preparation” section of this manual, pages 14-16. If you are unsure about how to perform any of the steps in this manual please call 1-800-232-1195 (M-F 8-5 CST) for customer service.
  • Page 17 STARTING YOUR GENERATOR BEFORE STARTING THE GENERATOR 1. Verify that the generator is outside on a dry, level surface. Allow at least two feet of clearance on all sides of the generator. 2. To maximize safety, check that the generator is properly grounded. Refer to "Step 3 - Ground The Generator" on page 15.

  • Page 18: Using Your Generator

    USING YOUR GENERATOR CALCULATING THE WATTAGE OF YOUR DEVICE(S) Connect electrical devices running on AC current according to their wattage requirements. Calculate the total run- ning wattage and starting wattage of the device(s) you wish to connect, and MAKE SURE that they are within the capacity of your generator and the capacity of each individual outlet.
  • Page 19 USING YOUR GENERATOR CALCULATING THE WATTAGE OF YOUR DEVICE(S) - CONTINUED The chart below serves as a reference for the estimated wattage requirements of common electrical devices. How- ever, do not solely rely on this chart - all electronics and appliances are built differently. Always check the wattage listed on the electrical device before consulting this chart.
  • Page 20 2400W. PARALLEL OPERATION The parallel connection ports (page 12) allow you to connect two WEN generators to increase the total available electrical power. The WEN Parallel Connection Kit can be purchased from wenproducts.com. Follow the instruc- tions included with your parallel connection kit for proper installation and operation.
  • Page 21 USING YOUR GENERATOR SOME NOTES ABOUT POWER CORDS Long or thin extension cords can drain the power provided to your electrical devices. Refer to the following chart in determining the necessary gauge extension cord for each of your devices. Round up to the higher amperage in the chart to maximize safety.

  • Page 22: Shutting Off Your Generator

    SHUTTING OFF YOUR GENERATOR CAUTION! Unplugging running devices can cause damage to the generator. Never stop the engine with electrical devices connected and running. WARNING! Allow the generator to cool down before touching areas that become hot during use. CAUTION! Allowing gasoline to sit in the fuel tank for long periods of time can make it difficult to start the gen- erator in the future.

  • Page 23: Maintenance

    MAINTENANCE RECOMMENDED MAINTENANCE SCHEDULE Proper routine maintenance of the generator will help prolong the life of the machine. Please perform maintenance checks and operations according to the maintenance schedule below, Table 4. If there are any questions about the maintenance procedures listed in this manual, please contact customer service at 1-800-232-1195 (M-F 8-5 CST), or email techsupport@wenproducts.com.
  • Page 24 To check the oil level and/or add oil refer to "Step 1 - Add/Check Oil" on page 13. TIP: Your WEN generator is compatible with the WEN 55201 Magnetic Oil Dipstick (not included), available for purchase at wenproducts.com. The dipstick’s industrial-strength magnetic tip will collect metal shavings from your generator’s oil tank to help preserve the engine and extend your generator’s lifespan.
  • Page 25 Damaged elements should be replaced with a new one. Replacement air filters can be purchased from wenproducts.com by searching part number GN400i-1002. 4. Reinstall the air filter element and air filter cover.
  • Page 26 Replacement spark arrestors can Boot be purchased from wenproducts.com by searching the part number GN400i-1101.1. 4. Reinstall the spark arrestor in the muffler and secure it in place with the screws. SPARK PLUG MAINTENANCE Inspect and change the spark plug every 100 hours of operation (refer to page 23, Table 4). The spark plug is important for proper engine operation.
  • Page 27 MAINTENANCE 5. Measure the plug gap with a spark plug gap gauge. The Fig. 16 gap should be 0.7 to 0.8 mm (0.028-0.031 in). Carefully adjust the gap if necessary. See Fig. 16. 0.7 - 0.8mm 6. Screw the spark plug back into the spark plug hole us- ing the spark plug wrench.

  • Page 28: Transportation & Storage

    Do not obstruct any ventilation openings. Follow the procedures below for properly storing your generator. TIP: Your WEN generator is compatible We highly recommend running your generator once a month for with the WEN 56310iC Generator Cover 20 to 30 minutes.

  • Page 29: Troubleshooting Guide

    TROUBLESHOOTING GUIDE WARNING! Stop using the generator immediately if any of the following problems occur or risk serious personal injury. If you have any questions, please contact customer service at 1-800-232-1195 (M-F 8-5 CST), or email techsupport@wenproducts.com. PROBLEM POSSIBLE CAUSE SOLUTION 1.
  • Page 30 TROUBLESHOOTING GUIDE WARNING! Stop using the generator immediately if any of the following problems occur or risk serious personal injury. If you have any questions, please contact customer service at 1-800-232-1195 (M-F 8-5 CST), or email techsupport@wenproducts.com. PROBLEM POSSIBLE CAUSE SOLUTION 1.

  • Page 31: Wiring Diagram

    WIRING DIAGRAM...

  • Page 32: Exploded View & Parts List

    ASSEMBLY 1 - CRANKCASE ASSEMBLY 2 - CRANKCASE COVER 11 11 Part No. Description Qty. Part No. Description Qty. GN400i-0201 Cover, Crankcase Crankcase GN400i-0101 56310i-0307 Bolt, M8x32 Subassembly GN400i-0203 Oil Dipstick Assembly GN400i-0102 Oil Drain Bolt...
  • Page 33 EXPLODED VIEW & PARTS LIST ASSEMBLY 3 - CYLINDER HEAD ASSEMBLY 4 - CRANKSHAFT Part No. Description Qty. Part No. Description Qty. GN400i-0401 Crankshaft Assembly GN400i-0301 Breather Tube 56200-1202 Bolt, M6x12 ASSEMBLY 5 - PISTON RING Cylinder Head Cover GN400i-0303...
  • Page 34 EXPLODED VIEW & PARTS LIST ASSEMBLY 6 - VALVE & CAMSHAFT ASSEMBLY 7 - RECOIL STARTER Part No. Description Qty. Part No. Description Qty. Recoil Starter GN400i-0601 Camshaft Assembly GN400i-0701 Assembly GN400i-0602 Valve Lock Nut 56200-1202 Bolt, M6x12 GN400i-0603 Valve Adjustment Nut...
  • Page 35 EXPLODED VIEW & PARTS LIST ASSEMBLY 9 - FLYWHEEL ASSEMBLY 11 - MUFFLER Part No. Description Qty. 56310i-1101 Flywheel Nut 56200-0706 Bolt, M6x10 GN400i-0903 Starter Pulley Part No. Description Qty. 56200-1202 Bolt, M6x12 11-1 GN400i-1101 Muffler Assembly 56380i-0705 Starter Pulley Seat N.P.
  • Page 36 EXPLODED VIEW & PARTS LIST ASSEMBLY 12 - FUEL TANK ASSEMBLY 13 - FRAME Part No. Description Qty. 12-1 GN400i-1201 Fuel Tank 12-2 GN400i-1202 Fuel Tank Cap 12-3 GN400I-1203 Fuel Strainer 12-4 GN400I-1204 Fuel Gauge Part No. Description Qty. 12-5...
  • Page 37 EXPLODED VIEW & PARTS LIST ASSEMBLY 14 - CONTROL PANEL Part No. Description Qty. 14-1 GN400i-1401 Control Panel Assembly 14-2 GN400i-1402 Control Panel Housing 14-3 GN400i-1403 Bolt, M6x14 14-4 GN400i-1404 Self-tapping Screw, ST4.2x16 14-5 GN400i-1405 Flat Washer, 4mm 14-6 GN400i-1406...

  • Page 38: Warranty Statement

    (2) years from date of purchase or 500 hours of use; whichever comes first. Ninety days for all WEN products if the tool is used for pro- fessional or commercial use.
  • Page 39 NOTES...
  • Page 40 THANKS FOR REMEMBERING v.2019.07.10...

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