Lawn-Boy 10739 Operator's Manual

Lawn-Boy 10739 Operator's Manual

21in mulching/rear bagging lawn mower

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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.
location of the model and serial numbers on the product.
Write the numbers in the space provided.
1. Model and serial number plate
Model No.
Serial No.
This manual identifies potential hazards and has safety
messages identified by the safety-alert symbol
which signals a hazard that may cause serious injury or death
if you do not follow the recommended precautions.
© 2016—Lawn-Boy® Inc.
8111 Lyndale Avenue South
Bloomington, MN 55420
21in Mulching/Rear Bagging Lawn
Mower
Model No. 10739—Serial No. 316000001 and Up
Model No. 17739—Serial No. 316000001 and Up
Figure 1
identifies the
1
g024069
Figure 1
(Figure
Register at www.LawnBoy.com.
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.
Receive a complimentary side-discharge chute by completing
the Discharge Chute Order Form when you register your
product at www.lawnboy.com/register. Please allow 1 to 2
weeks for delivery (subject to availability).
This product contains a chemical or chemicals
known to the State of California to cause cancer,
birth defects, or other reproductive harm.
The engine exhaust from this product
contains chemicals known to the State of
California to cause cancer, birth defects,
or other reproductive harm.
It is a violation of California Public Resource Code
Section 4442 or 4443 to use or operate the engine on any
forest-covered, brush-covered, or grass-covered land unless
the engine is equipped with a spark arrester, as defined in
Section 4442, maintained in effective working order or the
engine is constructed, equipped, and maintained for the
prevention of fire.
This spark ignition system complies with Canadian ICES-002.
The enclosed Engine Owner's Manual is supplied for
information regarding the US Environmental Protection
Agency (EPA) and the California Emission Control
2),
Regulation of emission systems, maintenance, and
warranty. Replacements may be ordered through the
engine manufacturer.
Net Torque
Form No. 3400-458 Rev B
Operator's Manual
Figure 2
WARNING
CALIFORNIA
Proposition 65 Warning
Original Instructions (EN)
All Rights Reserved *3400-458* B
Printed in the USA

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Do you have a question about the 10739 and is the answer not in the manual?

Questions and answers

Rick Smith
March 29, 2025

108-0954-03 is this the blade number for the lawn boy 10739 mower?

1 comments:
Mr. Anderson
March 29, 2025

Yes, 108-0954-03 is listed as the blade number for the Lawn-Boy 10739 mower, but it is marked as obsolete and not available.

This answer is automatically generated

Ron Goff
June 19, 2025

What #air filter needed for model 10739syronoff@atlantic bb.net

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Summary of Contents for Lawn-Boy 10739

  • Page 1: Introduction

    Whenever you need service, genuine Lawn-Boy parts, or WARNING additional information, contact an Authorized Service Dealer or Lawn-Boy Customer Service and have the model and CALIFORNIA serial numbers of your product ready. Figure 1 identifies the Proposition 65 Warning location of the model and serial numbers on the product.
  • Page 2: Table Of Contents

    Safety The gross or net torque of this engine was laboratory rated by the engine manufacturer in accordance with the Society of Automotive Engineers (SAE) J1940. As configured to meet This machine has been designed in accordance with ANSI safety, emission, and operating requirements, the actual engine B71.1-2012.
  • Page 3: Setup

    Setup Important: Remove and discard the protective plastic sheet that covers the engine. Unfolding the Handle 94-8072 No Parts Required Procedure WARNING Folding or unfolding the handle improperly can 117–2718 damage the cables, causing an unsafe operating condition. • Do not damage the cables when folding or unfolding the handle.
  • Page 4: Installing The Recoil-Starter Rope In The Rope Guide

    3. Install the handle knobs and tighten them firmly by hand. Installing the Recoil-Starter Rope in the Rope Guide No Parts Required Procedure Figure 5 Important: To start the engine safely and easily whenever you use the machine, install the recoil-starter 3.
  • Page 5: Product Overview

    Product Overview g027543 Figure 6 1. Handle 3. Grass bag 2. Frame Note: Do not slip the bag over the handle (Figure 2. Hook the bottom channel of the bag onto the bottom of the frame (Figure Figure 8 1. Self-propel-drive bar 6.
  • Page 6: Operation

    Before Operation accessories is available for use with the machine to enhance and expand its capabilities. Contact your Authorized Service Dealer or Distributor or go to www.Lawn-Boy.com for a list Before Operation Safety of all approved attachments and accessories. Filling the Fuel Tank General Safety •...
  • Page 7: Adjusting The Cutting Height

    2. Remove the dipstick (Figure 10). Figure 11 1. Raise the machine 2. Lower the machine Note: The cutting height settings are 32 mm (1-1/4 inches); 44 mm (1-3/4 inches); 57 mm (2-1/4 inches); 70 mm (2-3/4 Figure 10 inches); 83 mm (3-1/4 inches); and 95 mm (3-3/4 inches). During Operation 3.
  • Page 8: Starting The Engine

    • Use accessories and attachments approved by the Lawn-Boy® Inc. only. Slope Safety • Mow across the face of slopes; never up and down. Use extreme caution when changing direction on slopes.
  • Page 9: Bagging The Clippings

    For best performance, install a new blade before the in serious personal injury. cutting season begins. • Replace the blade when necessary with a Lawn-Boy Shut off the engine and wait for all moving parts to replacement blade. stop before leaving the operating position.
  • Page 10: After Operation

    After Operation 2. When no more clippings come out, stop the water and move the machine to a dry area. 3. Run the engine for a few minutes to dry the underside After Operating Safety of the machine to prevent it from rusting. General Safety Folding the Handle •...
  • Page 11: Maintenance

    Maintenance Note: Determine the left and right sides of the machine from the normal operating position. Recommended Maintenance Schedule(s) Maintenance Service Maintenance Procedure Interval • Check the engine oil level. • Ensure that the engine shuts off within 3 seconds after releasing the blade-control Before each use or daily bar.
  • Page 12: Servicing The Air Cleaner

    Servicing the Air Cleaner Changing the Engine Oil Changing the engine oil is not required, but if you desire Service Interval: Every 25 hours/Yearly (whichever comes to change the oil, use the following procedure. first)—Check the air cleaner for dirty, loose, or damaged parts, and clean or Run the engine a few minutes before changing the oil to warm replace them if necessary.
  • Page 13: Replacing The Blade

    • Important: Position the curved ends of the blade If the oil level is low, add a small amount of oil slowly to the oil-fill tube, and then repeat steps to point toward the machine housing. through until the oil level on the dipstick is 6.
  • Page 14: Storage

    Remove the Machine from Storage Storage Store the machine in a cool, clean, dry place. 1. Check and tighten all fasteners. 2. Remove the spark plug and spin the engine rapidly Preparing the Machine for by pulling the recoil-start handle or using the electric Storage starter (electric-start model only) to blow the excess oil from the cylinder.
  • Page 15 Notes:...
  • Page 16 If for any reason you are dissatisfied with your Distributor's service or have difficulty obtaining guarantee information, contact the Lawn-Boy importer. If all other remedies fail, you may contact us at Lawn-Boy Warranty Company.

This manual is also suitable for:

17739316000001

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