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Craftsman 247.377441 - User Manual

Craftsman 247.377441
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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
• UNPACKING P. 8
• ASSEMBLY
• OPERATION
• MAINTENANCE
• ESPAÑOL
21” LAWN MOWER
Model No. 247.377441
Form No. 769-1213
(January 24, 2017)

Table of Contents

Questions and Answers

  • G
    gregory67Aug 15, 2025
    Why won't my Craftsman 247.377441 Lawn Mower engine start?
    • B
      barkerkatieAug 15, 2025
      If your Craftsman Lawn Mower engine won't start, several factors could be at play. First, ensure the blade control is engaged. Next, check that the spark plug boot is securely connected. Also, verify that the fuel tank isn't empty and that you're using fresh gasoline. If your mower has a primer, make sure you've primed the engine correctly. A faulty spark plug could also be the culprit, so inspect, clean, adjust the gap, or replace it if needed. If the engine is flooded, wait a few minutes before attempting to restart. Finally, a blocked fuel line could be the issue; in this case, contact your Sears Parts & Repair Center to have the fuel line cleaned.
  • G
    gstricklandAug 19, 2025
    Why is my Craftsman 247.377441 engine overheating?
    • V
      Valerie MooreAug 19, 2025
      If your Craftsman Lawn Mower engine overheats, check the engine oil level and fill the crankcase with the proper oil if it's low. Also, ensure that the airflow around the engine isn't restricted by cleaning the area around and on top of the engine.
  • K
    Kimberly WallsAug 21, 2025
    Why does my Craftsman Lawn Mower leave an uneven cut?
    • W
      williamkennedyAug 21, 2025
      If your Craftsman Lawn Mower provides an uneven cut, ensure that the wheels are positioned correctly by adjusting the cutting height lever on the right front and right rear wheels to the same position. Also, check the blade; a dull blade can cause an uneven cut, so sharpen or replace it.
  • C
    Calvin WeeksAug 25, 2025
    What to do if my Craftsman 247.377441 electric starter fails?
    • D
      dbookerAug 26, 2025
      If your Craftsman Lawn Mower with electric starter fails to start, make sure the Electric Starter Push Key is fully inserted into the starter housing until it snaps into place. If that's not the issue, the battery may not be charged, so charge it. Lastly, a tripped circuit breaker could be the cause. Debris may be blocking blade operation. Stop the engine, remove the Electric Starter Push Key, and disconnect the spark plug boot. Verify grass or other debris is not obstructing the blade. Carefully clean out debris if necessary. Reattach the spark plug boot and reinsert the Electric Starter Push Key. Wait one minute after tripping for the circuit breaker to automatically self-reset, then reattempt start.
  • T
    toddstephanieAug 27, 2025
    Why won't my Craftsman 247.377441 Lawn Mower self-propel?
    • D
      dhallAug 28, 2025
      If your Craftsman Lawn Mower won't self-propel, first check the belt for proper pulley installation and movement. Debris clogging the drive operation can also be a factor; stop the engine, disconnect the spark plug boot, and clean out any debris. Inspect the belt for damage or wear; if necessary, see your Sears Parts & Repair Center to have the belt replaced. If the drive control is out of adjustment, refer to page 11 in the Assembly & Set-up section to adjust it.
  • T
    Tanner JacobsAug 30, 2025
    Why does my Craftsman 247.377441 Lawn Mower idle poorly?
    • C
      christina24Aug 30, 2025
      If your Craftsman Lawn Mower idles poorly, the spark plug may be fouled, faulty, or have a gap that's too wide. Reset the gap or replace the spark plug. A dirty air cleaner can also cause this issue; refer to Air Cleaner Maintenance in the Engine Manual.
  • T
    Thomas RiceSep 2, 2025
    Why is my Craftsman 247.377441 vibrating so much?
    • C
      Christopher WilsonSep 2, 2025
      If your Craftsman Lawn Mower is vibrating excessively, it could be due to a loose or unbalanced cutting blade. Make sure to tighten the blade and adapter and balance the blade. Another possibility is a bent cutting blade, which would require a replacement.
  • C
    Colleen JacobsSep 5, 2025
    Why does my Craftsman Lawn Mower engine run erratically?
    • M
      Margaret WalterSep 5, 2025
      If your Craftsman Lawn Mower engine is running erratically, start by checking the spark plug boot to ensure it's connected and tight. Stale fuel can also cause this issue, so refill the tank with clean, fresh gasoline. Make sure the vent in the gas cap isn't plugged, and 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 Maintenance in the Engine Manual. Finally, a blocked fuel line could be the problem; in this case, contact your Sears Parts & Repair Center to have the fuel line cleaned.
  • M
    Marie SchmittSep 8, 2025
    Why is my Craftsman Lawn Mower not mulching grass properly?
    • R
      rperrySep 8, 2025
      If your Craftsman Lawn Mower isn't mulching grass effectively, consider these factors: avoid mowing when the grass is wet, as this can hinder mulching. If the grass is excessively high, mow once at a higher cutting height, then mow again at the desired height, or narrow the cutting path. Lastly, a dull blade will not mulch effectively, so sharpen or replace the blade.
  • K
    kimberly66Sep 12, 2025
    What causes occasional skips in my Craftsman Lawn Mower?
    • D
      darren62Sep 12, 2025
      If your Craftsman Lawn Mower occasionally skips or hesitates, the spark plug gap may be too close. Adjust the gap, referring to the Spark Plug Maintenance section in the Engine Manual.

Summary

Warranty Statement

Safety Instructions

General Operation Safety

General safety guidelines for operating the mower.

Slope Operation Safety

Safety precautions for operating the mower on slopes.

Children Safety Precautions

Rules and warnings regarding children's safety around the mower.

Gasoline Handling Safety

Safe handling procedures for gasoline to prevent injury or damage.

Engine and Emission Safety

Warnings against engine modification and emission control notices.

Spark Arrestor Requirements

Information and warnings about the spark arrestor requirement.

Safety Symbols Guide

Explains various safety symbols used in the manual and on the product.

Slope Guide

Assembly

Carton Opening and Unpacking

Steps for opening the product carton and removing contents.

Handle Assembly

Detailed steps for assembling the mower's handle.

Grass Catcher Attachment

Guide for assembling and attaching the grass catcher accessory.

Adjustments

Cutting Height Adjustment

How to adjust the mower's cutting height for different grass lengths.

Handle Pitch Adjustment

Instructions for adjusting the handle position for operator comfort.

Drive Control Adjustment

How to adjust the drive control for proper self-propulsion.

Operation

Key Controls

Explains operation of Blade Control and Drive Control.

Safety Features

Details the function of the Trail Shield.

Engine Preparation and Starting

Covers checking fluids, starting procedures (recoil/electric), and stopping the engine.

Mowing and Grass Handling

Details on mowing techniques, mulching, and using the grass catcher.

Service and Maintenance

Maintenance Schedule and Guidelines

Outlines recommended maintenance tasks, intervals, and general advice.

Lubrication and Engine Care

Instructions for lubricating components and cleaning the engine.

Deck and Blade Maintenance

Procedures for cleaning the deck and servicing the mower blade.

Battery and Belt Maintenance

Guidance on maintaining the electric starter battery and drive belt.

Off-Season Storage

Engine Preparation for Storage

Steps to prepare the engine for long-term storage.

Mower Preparation for Storage

How to prepare the mower itself for off-season storage.

Battery Storage Recommendations

Guidelines for storing the electric starter battery during off-season.

Troubleshooting

Engine Starting Problems

Common causes and remedies for engine starting issues.

Engine Performance Problems

Solutions for erratic engine running, overheating, or hesitations.

Mowing and Vibration Issues

Troubleshooting for idling, vibration, mulching, and uneven cut problems.

Propulsion System Issues

Solutions for when the mower fails to self-propel.

Craftsman 247.377441 Specifications

General IconGeneral
Engine Type4-Cycle
Cutting Width21 inches
Starter TypeRecoil
Drive TypeSelf-propelled
Weight84 lb.
Deck Size21 inches
Deck MaterialSteel
EngineBriggs & Stratton
Cutting Height1.25-3.75 inches
Discharge OptionsSide, Rear, Mulch
Grass DischargeSide, Rear, Mulch
Wheel Size (Front/Rear)8 inches / 11 inches

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