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Operator's Manual
Introduction
Read this information carefully to learn how to operate
and maintain your product properly and to avoid injury
and product damage. You are responsible for operating
the product properly and safely.
You may contact Lawn-Boy directly at
www.Lawn-Boy.com for product and accessory
information, help finding a dealer, or to register your
product.
Whenever you need service, genuine Lawn-Boy parts,
or additional information, contact an Authorized
Service Dealer or Lawn-Boy Customer Service and have
the model and serial numbers of your product ready.
Figure 1 identifies the location of the model and serial
numbers on the product. Write the numbers in the
space provided.
Figure 1
1. Model and serial number plate
© 2008—Lawn-Boy® Inc.
8111 Lyndale Avenue South
Bloomington, MN 55420
20in Mulching/Rear Bagging Lawn
Mower
Model No. 10640—Serial No. 290000001 and Up
Model No. 10640C—Serial No. 290000001 and Up
Model No. 10641—Serial No. 290000001 and Up
Model No. 10641C—Serial No. 290000001 and Up
Model No. 10642—Serial No. 290000001 and Up
Model No. 10642C—Serial No. 290000001 and Up
Model No. 10643C—Serial No. 290000001 and Up
Model No. 10644C—Serial No. 290000001 and Up
Model No. 10645—Serial No. 290000001 and Up
Model No. 10646—Serial No. 290000001 and Up
Model No. 10647—Serial No. 290000001 and Up
Model No.
Serial No.
This manual identifies potential hazards and has
safety messages identified by the safety alert symbol
(Figure 2), which signals a hazard that may cause serious
injury or death if you do not follow the recommended
precautions.
1. Safety alert symbol
This manual uses two words to highlight information.
Important calls attention to special mechanical
information and Note emphasizes general information
worthy of special attention.
Important: This engine is not equipped with a
spark arrester muffler. It is a violation of California
Register at www.Lawn-Boy.com.
Form No. 3361-328 Rev B
Figure 2
Warning
CALIFORNIA
Proposition 65 Warning
The engine exhaust from this product
contains chemicals known to the State of
California to cause cancer, birth defects,
or other reproductive harm.
Original Instructions (EN)
Printed in the USA
All Rights Reserved

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Summarization of Contents

Introduction to Your Lawn Mower
Operator's Manual Overview
General information about the operator's manual for the lawn mower.
Identifying Your Mower Model and Serial Number
Identifies model and serial numbers for product identification and service.
Understanding the Safety Alert Symbol
Explains the safety alert symbol used to signal potential hazards.
California Proposition 65 Safety Warning
Warning about chemicals in engine exhaust known to cause cancer or birth defects.
General Safety Precautions
Essential Safety Instructions
Essential safety instructions for operating the lawn mower safely.
Safe Slope Operation Guidelines
Guidelines for operating the mower safely on slopes to prevent accidents.
General Mowing Operation
Safe Gasoline Handling and Storage
Instructions for safe handling of gasoline to prevent fire or explosion hazards.
Carbon Monoxide Exhaust Warning
Warning about carbon monoxide from engine exhaust, advising against indoor use.
Safety and Instructional Decals Explained
Decal Meanings and Identification
Explains various safety and instructional decals and their meanings.
Battery Charging Safety Warning
Warning regarding battery charging instructions and lead content for electric-start models.
Initial Setup Procedures
Handle Setup and Adjustment
Instructions for unfolding the mower handle, emphasizing cable care.
Engine Oil Filling Procedure
Guide on how to properly fill the engine with oil before first use.
Fuse Installation for Electric Start
Steps for installing the fuse for electric-start models to protect the starter.
Product Overview and Parts
Identifying Mower Components
Identifies and labels the various parts of the lawn mower.
Available Attachments and Accessories
Information on available attachments and accessories for the mower.
Fuel Tank Filling and Safety
Fueling Safety Precautions
Safety guidelines for filling the fuel tank to prevent fire and explosion.
Checking Engine Oil Level
Procedure for checking the engine oil level before each use.
Adjusting Cutting Height
Instructions on how to adjust the mower's cutting height, with safety notes.
Cutting Height Adjustment
Cutting Height Adjustment Steps
Detailed steps on how to adjust the cutting height levers for desired lawn cut.
Starting the Mower Engine
Step-by-step guide on how to start the mower's engine.
Operating the Self-Propel Drive
Engaging and Disengaging Self-Propel
Instructions on how to engage and disengage the self-propel drive feature.
Stopping the Mower Engine
Procedure for safely stopping the mower's engine.
Installing the Grass Bag
Steps for attaching the grass bag for collecting clippings.
Mowing Operating Tips
General Mowing Best Practices
General advice for effective and safe mowing practices.
Effective Grass Cutting Techniques
Tips for cutting grass at different heights and conditions for best results.
Cutting Leaves with Your Mower
Guidance on mowing leaves for optimal lawn appearance and mower performance.
Mower Maintenance Schedule
Recommended Maintenance Schedule
Outlines the recommended maintenance schedule based on operating hours.
Preparing for Maintenance Work
Essential safety steps before performing any maintenance on the mower.
Air Filter Replacement
Air Filter Replacement Steps
Step-by-step guide for replacing the air filter on the mower.
Engine Oil Change Procedure
Detailed instructions for changing the engine oil, including draining and refilling.
Battery Charging and Fuse Replacement
Battery Charging Procedure (Electric Start)
How to charge the battery for electric-start models.
Replacing the Fuse (Electric Start)
Instructions for replacing a blown fuse in electric-start models.
Replacing the Mower Blade
Guide on how to safely replace the mower blade, including torque specifications.
Self-Propel Drive Cable Adjustment
Adjusting the Self-Propel Cable
Procedure to adjust the self-propel drive cable for proper operation.
Cleaning the Mower Housing
Method for cleaning the mower housing using water while the engine is running.
Mower Storage Procedures
Preparing for Off-Season Storage
Steps to prepare the mower for long-term storage, including fuel stabilization.
Folding the Handle for Storage
Instructions on how to fold the handle for compact storage.
Removing Mower from Storage
Steps to take when removing the mower from storage for use.
Lawn-Boy Warranty Details
No-Worry Warranty Coverage Details
Details the coverage and periods for the No-Worry Warranty.
Tru-Start Engine Commitment
Explains the Tru-Start Commitment for engine starting.
Owner Responsibilities for Warranty
Outlines the owner's responsibilities to maintain the product for warranty coverage.
Warranty Exclusions and Limitations
Lists items and conditions that are not covered by the warranty.
How to Obtain Warranty Service
Instructions on how to obtain warranty service for the product.

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