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Introduction

This rotary-blade, walk-behind lawn mower is intended
to be used by residential homeowners. It is designed
primarily for cutting grass on well-maintained lawns
on residential properties. It is not designed for cutting
brush or for agricultural uses.
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.
1. Model and serial number plate
© 2013—Lawn-Boy® Inc.
8111 Lyndale Avenue South
Bloomington, MN 55420
21in Mulching/Rear Bagging Lawn
Mower
Model No. 10730—Serial No. 314000001 and Up
Model No. 10732—Serial No. 314000001 and Up
Model No. 10734—Serial No. 314000001 and Up
Model No. 17730—Serial No. 314000001 and Up
Model No. 17732—Serial No. 314000001 and Up
Model No. 17734—Serial No. 314000001 and Up
Receive a free side-discharge chute by
completing the Discharge Chute Order
Form when you register your product at
www.Lawn-Boy.com! Please allow four to five
weeks for delivery.
1
g024069
Figure 1
Register at www.LawnBoy.com.
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 2 words to highlight information.
Important calls attention to special mechanical information
and Note emphasizes general information worthy of special
attention.
Original Instructions (EN)
All Rights Reserved *3379-226* A
Printed in the USA
Form No. 3379-226 Rev A
Operator's Manual
Figure 2

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Summarization of Contents

Introduction
Model and Serial Number Identification
Identifies the location of model and serial numbers on the product for reference.
Safety
General Operation Safety
Provides essential safety instructions for operating the lawn mower to prevent injury.
General Operation
Safe Operation Practices
Details safe practices for operating the lawn mower, including hand/foot placement and clearing the area.
Slope Operation
Safe Mowing on Slopes
Provides crucial safety advice for mowing on slopes to prevent accidents and injuries.
Children Safety
Preventing Child Accidents
Emphasizes keeping children away from the mower and ensuring adult supervision during operation.
Service and Fuel Handling
Safe Handling of Gasoline
Details precautions for safely handling gasoline to prevent fire and explosion hazards.
General Service and Maintenance
Routine Service Procedures
Outlines general service practices for maintaining the mower in safe working condition.
Safety and Instructional Decals
Decal Identification and Importance
Explains the location and significance of safety and instruction decals on the machine.
Hauling and Transport
Safe Loading and Securing
Provides guidelines for safely loading and securing the mower into a trailer or truck.
Safety Decals and Warnings
Understanding Hazard Symbols
Explains various safety symbols and their associated hazards, including cutting and thrown object risks.
Setup and Initial Assembly
Unfolding the Handle
Instructions for safely unfolding the mower's handle, cautioning against cable damage.
Installing the Recoil-starter Rope
Securing the Starter Rope
Details how to install the recoil-starter rope into the rope guide for easy starting.
Filling the Engine with Oil
Engine Oil Level Check
Guides on filling the engine with the correct type and amount of oil before initial use.
Product Overview
Mower Component Identification
Identifies and labels the main components of the lawn mower, including controls and parts.
Operation and Fueling
Filling the Fuel Tank
Provides critical safety warnings and instructions for filling the fuel tank with gasoline.
Checking the Engine-oil Level
Maintaining Correct Oil Level
Details the procedure for checking the engine oil level before each use to prevent damage.
Adjusting the Cutting Height
Setting Mower Blade Height
Explains how to adjust the cutting height for different grass conditions and preferences.
Starting the Engine
Engine Ignition and Start
Provides instructions for starting the mower engine using the blade-control bar and starter mechanism.
Using the Self-propel Drive
Engaging Self-Propel Feature
Explains how to engage and operate the self-propel drive system on applicable models.
Stopping the Engine
Safely Shutting Down Engine
Details the procedure for safely stopping the mower engine using the blade-control bar.
Bagging the Clippings
Installing the Grass Bag
Provides instructions on how to attach the grass bag for collecting clippings.
Operating Tips
General Mowing Practices
Offers advice on clearing the area, avoiding objects, and handling machine issues during mowing.
Cutting Grass Recommendations
Guides on optimal grass cutting height, speed, and conditions for best results and mower performance.
Maintenance Schedule and Procedures
Recommended Maintenance Schedule
Outlines a schedule for essential maintenance tasks based on operating hours and time intervals.
Preparing for Maintenance
Safety Precautions for Servicing
Details essential safety steps, such as stopping the engine and disconnecting the spark plug wire, before performing maintenance.
Servicing the Air Cleaner
Cleaning or Replacing Air Filter
Explains how to clean or replace the air cleaner element for optimal engine performance.
Changing the Engine Oil
Engine Oil Replacement Procedure
Provides step-by-step instructions for draining and refilling the engine oil.
Charging the Battery (Electric-start models)
Battery Charging Instructions
Details how to charge the battery for electric-start models, including initial and periodic charging.
Replacing the Fuse (Electric-start models)
Fuse Replacement Procedure
Explains how to replace a blown fuse in electric-start models to restore starter or charging function.
Replacing the Blade
Blade Replacement and Torque
Provides instructions and torque specifications for safely replacing the mower blade.
Adjusting the Self-propel Drive Cable
Self-Propel Cable Adjustment
Guides on how to adjust the self-propel drive cable for proper operation and to prevent creeping.
Cleaning the Underside of the Machine
Removing Grass Clippings
Details a method for cleaning grass clippings from under the mower deck using water.
Storage and Preparation
Preparing the Machine for Storage
Provides steps for preparing the mower for long-term storage, including fuel and oil management.
Folding the Handle
Instructions on how to fold the handle for more compact storage, with a safety warning.
Warranty Information
Conditions and Products Covered
Details the products covered by the warranty and the conditions under which it applies.
Obtaining Warranty Service
Explains the procedure for obtaining warranty service and contacting customer support.
Items and Conditions Not Covered
Lists items and conditions that are specifically excluded from warranty coverage.

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