Wen GN875i Instruction Manual
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Wen GN875i Instruction Manual

8750-watt inverter generator
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MODEL GN875i
8750-WATT
INVERTER GENERATOR
Instruction Manual
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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Summary of Contents for Wen GN875i

  • 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 General Safety Rules ..................5 Generator Safety Warnings ................7 BEFORE OPERATING Unpacking & Packing List ................9 Know Your Generator ..................10 Assembly & Adjustments ................12 Generator Preparation ..................14 OPERATION &...

  • Page 3: Welcome

    SPECIFICATIONS GENERATOR Model Number GN875i Surge (Starting) Wattage 8750W Rated (Running) Wattage 7000W Rated Voltage 120V / 240V AC Phase Single Frequency 60 Hz Product Weight With Wheel Kit 136.7 lbs Product Weight Without Wheel Kit 133 lbs Product Dimensions With Wheel Kit 26.8 in.

  • Page 4: Introduction

    INTRODUCTION Thanks for purchasing the WEN 8750-Watt Inverter Generator. Refer to the illustration below for the location of the serial number on the specifications label. Record the generator information in the spaces provided below. If assis- tance for information or service is required, please contact customer service by calling 1-800-232-1195, M-F 8-5 CST;...

  • Page 5: Safety

    GENERAL SAFETY RULES WARNING! Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury. Safety is a combination of common sense, staying alert and knowing how your item works. The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
  • Page 6 GENERAL SAFETY RULES WARNING! Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury. Safety is a combination of common sense, staying alert and knowing how your item works. The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.

  • Page 7: 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 8 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 pow- er cord is broken, damaged, or defective, make sure 1.

  • Page 9: Before Operating

    If any part is missing or broken, please contact customer service at 1-800-232-1195 (M-F 8-5 CST), or email techsupport@wenproducts.com. Components Handle Assembly Tools & Accessories Generator .........1 Handle Bracket ......1 GN875i-HA36 High Altitude Kit ....1 Handle ........1 GN875i-HA68 High Altitude Kit ....1 Feet Assembly M6x30 Bolt ......4 Spark Plug Socket ........1 Feet ..........2 Screwdriver ..........1...

  • Page 10: Know Your Generator

    KNOW YOUR GENERATOR TOOL PURPOSE Generators provide you with power when and where you need it most. 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.
  • Page 11 KNOW YOUR GENERATOR CONTROL PANEL AC BREAKER AC BREAKER 1. Engine Switch 6. Data Meter Start and stop engine. Refer to p. 18 for more details. Displays voltage, frequency, total runtime (HHHH), and session runtime (HH:MM). Press the MODE but- 2.

  • Page 12: Assembly & Adjustments

    This kit should be installed by a qualified mechanic. Con- Fig. 1 tact customer service at 1-800-232-1195 (M-F 8-5 CST), or email techsupport@wenproducts.com for information about service centers near you. Two high-altitude kits (part numbers GN875i-HA36 and GN875i-HA68) are included with your generator. Carburetor Carburetor Assembly Assembly Gather the parts in the high altitude kit.
  • Page 13 ASSEMBLY & ADJUSTMENTS WARNING! Do not turn on the generator until it is fully assembled according to the instructions. Read through and become familiarized with the following procedures of handling and adjusting your tool. Failure to follow the safety instructions may result in serious personal injury. •...

  • Page 14: 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.
  • Page 15 GENERATOR PREPARATION TO CHECK OIL LEVEL (before every subsequent start): Fig. 5 1. Place the generator on a level surface. Make sure the engine is OFF before adding or checking oil. 2. Remove and wipe the dipstick with a clean rag. Upper Limit 3.
  • Page 16 2. If the tank is empty add gasoline to the gas tank. See above section, "To Add Gasoline". STEP 3 - CONNECT THE BATTERY WARNING! Use only genuine WEN batteries with your generator (part no. 56380i-1304). Use of other batteries may induce premature product failure and could pose a safety risk.
  • Page 17 ABOUT THE BATTERY (CONT.) 6. DO NOT DISASSEMBLE. Incorrect reassembly may pose a serious risk of electric shock, fire or exposure to toxic battery chemicals. If the battery or charger are damaged, call WEN customer service at 1-800-232-1195 for as- sistance.

  • Page 18: Operation & Maintenance

    STARTING THE GENERATOR Before starting the generator, make sure you have read and performed the steps in the “Generator Preparation” sec- tion of this manual. 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 19 START position too long can damage fore attempting to start the generator again. If prob- the starter motor. If the engine does not start after lems persist, please contact WEN customer service multiple attempts, please consult the troubleshooting (see front page of manual).

  • Page 20: Using The 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 21 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 22 USING YOUR GENERATOR CONNECTING ELECTRICAL DEVICES 1. Before connecting electrical devices, allow the generator to run for a few minutes to stabilize the speed and volt- age output. 2. Select the device with the highest wattage, and make sure it is turned off. Plug the device into the matching gen- erator outlet and then turn the device on.
  • Page 23 USING YOUR GENERATOR LIGHT MEANING RESOLUTION GREEN (POWER INDICATOR) (OVERLOAD) Generator output is normal. No action needed. Flashes 1x, repeating Voltage at alternator is too low. No elec- Check for loose connections. Call every 3 sec trical output. 1-800-232-1195 for assistance. Flashes 2x, repeating Engine speed is too low.

  • Page 24: Shutting Off The Generator

    SHUTTING OFF THE GENERATOR CAUTION! Unplugging running devices can cause damage to the generator. Never stop the engine with elec- trical 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 25: 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 26 MAINTENANCE CLEANING YOUR GENERATOR Keep the generator clean to prevent improper operation or machine damage from dirt and debris. Inspect all ventila- tion openings on the generator. These openings must be kept clean and unobstructed. If the generator becomes dirty, use a damp cloth to wipe exterior surfaces. Use a soft bristle brush to loosen dirt and oil and use a vacuum to pick up loose dirt.
  • Page 27 MAINTENANCE DRAINING THE CARBURETOR Fig. 12 Drain the carburetor after every use and before storing the generator (refer to Table 4). Draining the carburetor can help prevent build-up and blockages caused by stagnant fuel inside of the carburetor. 1. Prepare an approved gasoline-storage container under the carburetor to collect the drained fuel.
  • Page 28 MAINTENANCE INSPECTING/CLEANING THE SPARK ARRESTOR Fig. 14 Inspect and clean the spark arrestor every 100 hours of operation (refer to Table 4). The spark arrestor is located outside the muffler, which gets very hot during operation. Allow the engine to cool completely before servicing the spark arrestor.
  • Page 29 MAINTENANCE 5. Measure the plug gap with a spark plug gap gauge. The Fig. 15 gap should be 0.7 to 0.8 mm (0.028-0.031 in). Carefully adjust the gap if necessary. See Fig. 15. 0.7 - 0.8mm 6. Screw the spark plug back into the spark plug hole us- ing the spark plug wrench.
  • Page 30 MAINTENANCE BATTERY MAINTENANCE/STORAGE The battery will receive charge when the engine is running. Remember to run the generator once a month for 20-30 minutes to charge the battery. A charged battery will allow you to start the generator during your next time of need. IMPORTANT! If you do not plan to use the generator for a long period of time, we recommend DISCON- NECTING the negative battery cable from the battery to protect the battery from losing charge.

  • Page 31: Transportation & Storage

    TIP: Your WEN generator is compatible We highly recommend running your generator once a month for with the WEN 56409 Generator Cover (not 20 to 30 minutes. Plug in a small load in to ensure there is proper included). It is available for purchase at power output.

  • Page 32: 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 33 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 34: Wiring Diagram

    WIRING DIAGRAM...

  • Page 35: Exploded View & Parts List

    GN875i-0105 Oil Drain Hose Fitting GN875i-0206 Subassembly GN625i-0205 Oil Drain Hose 56310i-0109 Bolt, M8x34 GN625i-0207 Engine Oil Sensor GN875i-0208 Stud Bolt, M6/M8x110 GN625i-0208 Bolt, M6x16 Cylinder Body Shroud, GN875i-0209 GN875i-0109 Nut, M10 Secondary 1-10 GN400i-0910 Bolt, M5x16 Cylinder Head Cover...
  • Page 36 EXPLODED VIEW & PARTS LIST ASSEMBLY 3 - CRANKCASE COVER ASSEMBLY 4 - CRANKSHAFT, CONNECTING ROD Part No. Description Qty. Part No. Description Qty. GN875i-0301 Crankcase Cover Gasket GN875i-0401 Balance Shaft Assembly GN875i-0302 Bearing, 6202P6 Connecting Rod GN875i-0402 Oil Dipstick Assembly...
  • Page 37 ASSEMBLY 7 - SHROUD, LOWER SHIELD Part No. Description Qty. Part No. Description Qty. 56200-1202 Bolt, M6x12 GN625i-0802 Retaining Ring GN625i-0701 Bolt, M6x20 GN875i-0602 Recoil Starter Assembly GN875i-0703 Shroud GN625i-0703 Flat Washer, 6mm GN400i-0703 Clip ASSEMBLY 8 - CARBURETOR Part No. Description Qty. Part No.
  • Page 38 EXPLODED VIEW & PARTS LIST ASSEMBLY 9 - FLYWHEEL, IMPELLER, ASSEMBLY 10 - AIR FILTER STARTER PULLEY Part No. Description Qty. 10-1 GN875i-1001 Air Filter Assembly Part No. Description Qty. 10-2 56200-0506 Nut, M6 GN875i-0901 Rotor 10-3 GN875i-1003 Air Filter Element...
  • Page 39 Fuel Tank 12-10 GN625i-1310 Fuel Tank Chain Clip 12-2 56380i-1207 Fuel Tank Damper 12-11 GN400i-1205 Breather Valve 12-3 GN625i-1303 Bushing 12-12 GN875i-1212 Breather Hose 12-4 GN625i-1304 Flat Washer, 6mm 12-13 GN400i-1316 Rubber Cover 12-5 GN625i-1305 Bolt, M6x25 12-14 GN875i-1214 Air Filter Hose...
  • Page 40 EXPLODED VIEW & PARTS LIST ASSEMBLY 13 - FRAME Part No. Description Qty. Part No. Description Qty. 13-1 GN875i-1301 Frame Assembly 13-16 GN400i-1313 Nut, M6 13-2 GN625i-1402 Nut, M10-1.25 Battery (Li-ion, 12V, 13-17 56380i-1304 1.6Ah) 13-3 56310i-1404 Nut, M8 13-18...
  • Page 41 GN400i-1406 Assembly 14-20 56380i-1422 Eco-Mode Switch 14-9 GN625i-1509 Choke Lever & Cable NEMA L14-30R Outlet 14-21 GN625i-1521 14-10 GN625i-1510 AC Breaker, 20A Cover 14-11 GN625i-1511 Data Meter 14-23 GN400i-1408 Rectifier Bridge 14-12 GN875i-1412 Engine Switch 14-24 GN625i-1524 NEMA L14-30R Outlet...
  • Page 42 GN625i-1617 Handle Tube Plug 15-8 GN625i-1608 Nut, M8 15-18 GN625i-1618 Flat Washer, 8mm 15-9 GN625i-1609 Nut, M12-1.25 ACCESSORIES (NOT PICTURED) Part No. Description Qty. High-Altitude Kit, N.P. GN875i-HA36 3000 - 6000 ft High-Altitude Kit, N.P. GN875i-HA68 6000 - 8000 ft...

  • Page 43: Warranty Statement

    Contact techsupport@wenproducts.com or 1-800-232-1195 with the following information to make arrangements: your shipping address, phone number, serial number, required part numbers, and proof of purchase. Damaged or defective parts and products may need to be sent to WEN before the replacements can be shipped out.
  • Page 44 THANKS FOR REMEMBERING V. 2021.10.15...

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