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Craftsman 12AE999P099 - User Manual

Craftsman 12AE999P099
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Sears Brands Management Corporation, Hoffman Estates, IL 60179, U.S.A.
Visit our website: www.craftsman.com
CAUTION: Before using
this product, read this
manual and follow all
safety rules and operating
instructions.
Operator’s Manual
• SAFETY
• ASSEMBLY
• OPERATION
• MAINTENANCE
• PARTS LIST
• ESPAÑOL, p. 39
21” SELF PROPELLED MOWER
Model No. 247.887761
6/22/2011
FORM NO. 769-04706D

Table of Contents

Questions and Answers

  • M
    Michael WalkerAug 14, 2025
    Why Craftsman 12AE999P099 engine fails to start?
    • W
      whiteangelaAug 14, 2025
      Several factors can prevent your Craftsman Lawn Mower engine from starting. Ensure the blade control is engaged. Check that the spark plug boot is connected securely. If the fuel tank is empty or contains stale fuel, refill it with fresh gasoline. A faulty spark plug may also be the culprit, so clean, adjust the gap, or replace it. If the engine is flooded, wait a few minutes before attempting to restart. A blocked fuel line can also prevent starting; contact your Sears Parts & Repair Center to have the fuel line cleaned. Lastly, if you have an electric start model, a burnt fuse could be the issue; replace the fuse, referring to the Service Section for guidance.
  • B
    Brandon MartinezAug 17, 2025
    How to fix uneven cut with Craftsman 12AE999P099 Lawn Mower?
    • F
      frank40Aug 17, 2025
      An uneven cut with your Craftsman Lawn Mower is often due to a dull blade. Sharpen or replace the blade to resolve this issue.
  • W
    whallAug 20, 2025
    Why my Craftsman 12AE999P099 Lawn Mower is not mulching grass?
    • J
      Joseph SmithAug 21, 2025
      Your Craftsman Lawn Mower might not mulch grass effectively due to a few reasons. Avoid mowing when the grass is wet, allowing it to dry first. If the grass is excessively high, mow once at a higher cutting height, then mow again at the desired height, or reduce the cutting path width. A dull blade can also hinder mulching, so sharpen or replace it.
  • J
    jamesmatthewsAug 25, 2025
    What to do if Craftsman 12AE999P099 Lawn Mower will not self propel?
    • D
      David MendozaAug 25, 2025
      If your Craftsman Lawn Mower won't self-propel, first check the belt for proper pulley installation and movement. Also, stop the engine, disconnect the spark plug boot, and clean out any debris clogging the drive operation. For a damaged or worn belt, contact your Sears Service Center.
  • M
    Michael RichAug 27, 2025
    What causes occasional skips in Craftsman 12AE999P099 Lawn Mower?
    • C
      cameron61Aug 27, 2025
      Occasional skips (hesitations) in your Craftsman Lawn Mower can occur if the spark plug gap is too close. Adjust the gap to .020” to resolve this.
  • K
    Karen ChenAug 31, 2025
    What to do if Craftsman 12AE999P099 Lawn Mower engine runs erratic?
    • R
      Ryan LambAug 31, 2025
      If your Craftsman Lawn Mower engine runs erratically, start by checking the spark plug boot, and connect and tighten it if loose. Stale fuel can also cause this issue, so replace it with clean, fresh gasoline. Ensure the vent in the gas cap isn't plugged; clear it if necessary. If there's water or dirt in the fuel system, run the engine until it stops from lack of fuel, then refill with fresh fuel. For a dirty air cleaner, refer to the Air Cleaner section in Engine Maintenance. Finally, a blocked fuel line may be the cause, in this case contact your Sears Parts & Repair Center to have the fuel line cleaned.
  • T
    Tracy MelendezSep 3, 2025
    What to do if Craftsman 12AE999P099 Lawn Mower engine overheats?
    • M
      Mandy MooreSep 3, 2025
      If your Craftsman Lawn Mower engine overheats, first check the engine oil level and fill the crankcase with the proper oil if it's low. Also, ensure that air flow is not restricted by cleaning the area around and on top of the engine.
  • B
    Brad PetersonSep 6, 2025
    Why Craftsman 12AE999P099 Lawn Mower has excessive vibration?
    • B
      bwolfSep 6, 2025
      Excessive vibration in your Craftsman Lawn Mower can stem from a loose or unbalanced cutting blade; tighten the blade and adapter, and balance the blade. Alternatively, a bent cutting blade could be the cause, requiring blade replacement.
  • V
    Vicki BlackwellSep 9, 2025
    Why Craftsman 12AE999P099 idles poorly?
    • M
      mitchellmarkSep 9, 2025
      Poor idling in your Craftsman Lawn Mower can be due to a spark plug that is fouled, faulty, or has a gap that is too wide; reset the gap to .020” or replace the spark plug. Another potential cause is a dirty air cleaner, for which you should refer to the Air Cleaner section in Engine Maintenance.

Summary

Safety Instructions

General Operation

Provides essential guidelines for safe operation and handling of the lawn mower.

Safety Alerts

Encompasses critical DANGER and WARNING messages regarding hazards and operator responsibilities.

Slope Safety

Details safe practices, limitations, and guidance for mowing on inclined surfaces.

Child Safety

Outlines precautions to protect children from mower hazards and operation.

Safety Symbols

Explains the meaning and significance of various safety symbols used in the manual.

Safety Labels

Illustrates and describes important safety decals found on the mower.

Assembly

Opening and Unpacking

Steps for opening the carton, removing the unit, and identifying loose parts.

Attaching the Handle

Instructions for securely attaching the upper and lower handles to the mower.

Attaching the Grass Catcher

Guide for installing the grass catcher and its adapter for bagging clippings.

Attaching Side Discharge Cover

Procedure for installing the side discharge cover for alternate grass clipping dispersal.

Adjustments

Covers adjustments for cutting height, caster locking, and drive control settings.

Operation

Control Panel and Functions

Details the location and purpose of various controls including blade, drive, and shift levers.

Starting and Stopping the Engine

Provides step-by-step instructions for safely starting and stopping the mower's engine.

Mowing Procedures

Explains how to use the mower for mulching or bagging grass clippings.

Service and Maintenance

Maintenance Schedule

Outlines recommended service intervals and tasks for engine and mower upkeep.

Engine Maintenance

Details procedures for maintaining the engine, including spark plug and air cleaner service.

Engine Care and Lubrication

Covers checking/changing engine oil, cleaning the engine, and lubricating key components.

Deck and Cable Maintenance

Instructions for cleaning the mower deck, replacing the rear flap, and adjusting the shift cable.

Blade, Belt, and Battery Service

Covers blade inspection/service, belt care, and procedures for replacing the mower battery.

Battery Charging and Fuse Replacement

Explains how to charge the battery and replace a blown fuse for the electric starter.

Off-Season Storage

Preparing the Engine for Storage

Steps to prepare the engine for long-term storage, including fuel system and oil changes.

Preparing the Mower for Storage

Covers cleaning, lubrication, and proper storage of the lawn mower and its battery.

Troubleshooting

Parts List

Emission Control System Warranty Statement

Owners Warranty Responsibilities

Details the owner's responsibilities for maintaining the engine and presenting it for warranty service.

Warranty Provisions

Specifies the parts covered, coverage length, and exclusions under the emission control warranty.

Repair Protection Agreement

Craftsman 12AE999P099 Specifications

General IconGeneral
BrandCraftsman
Model12AE999P099
Product TypeLawn Mower
EngineBriggs & Stratton
Engine Type4-cycle
Engine Displacement163cc
Cutting Width21 inches
Cutting Height Positions6
Drive SystemRear-Wheel Drive
Speed SettingsVariable
Cutting Height1.25 to 3.75 inches
Warranty2-year limited

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