Craftsman 247.39775 - User Manual

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Sears Brands Management Corporation, Hoffman Estates, IL 60179, U.S.A.

Visit our website: www.craftsman.comUsed under license

To order parts or schedule service for this

product, call:

1-888-331-4569

Customer Care Hot Line

Before using this equipment, read the

manual and follow all safety rules and

operating instructions.

© Sears Brands, LLC

Form No. 769-13213

(December 15, 2017)

21” LAWN MOWER

Model Nos. 247.39775*

* -- Last digit of model number varies

Operator’s Manual

21” LAWN MOWER

Model Nos. 247.37815*

247. 37833*

247. 378 60*

* -- Last digit of model number varies

CAUTION

TABLE OF CONTENTS

Safety Instructions ............................Pages 2-5

Slope Guide .....................................Page 6

Unpacking .......................................Page 7

Assembly .....................................Pages 7-9

Adjustments .......................................9-10

Operation ..................................Pag es 11-14

Service and Maintenance ....................Pages 15-17

Off-Season Storage ..............................Page 18

Troubleshooting ............................ Page 19-20

Español .........................................Page 21

Table of Contents

Questions and Answers

L
Lance WatersAug 16, 2025
Why won't my Craftsman 247.39775 Lawn Mower engine start?
- B
  Brent JacksonAug 16, 2025
  If your Craftsman Lawn Mower engine won't start, there are several potential causes: * The blade control might be disengaged, so ensure it is engaged. * The fuel valve may be OFF; if so, move it to the ON position. * The spark plug boot could be disconnected; reconnect it. * The fuel tank might be empty or contain stale fuel; refill with fresh gasoline. * The engine may not be primed (if equipped with a primer); prime it as instructed in the Operation section. * The spark plug could be faulty; clean, adjust the gap, or replace it. * The engine might be flooded; wait a few minutes before restarting. * A blocked fuel line could also be the problem; contact your Sears Parts & Repair Center to have it cleaned.
C
Catherine EricksonAug 19, 2025
Why does my Craftsman 247.39775 Lawn Mower leave an uneven cut?
- J
  Jacob LongAug 20, 2025
  If your Craftsman Lawn Mower is producing an uneven cut, the most likely cause is a dull blade. Sharpen or replace the blade.
J
Joshua GonzalezAug 22, 2025
Why won't my Craftsman Lawn Mower self propel?
- G
  Gabriel JohnsonAug 22, 2025
  If your Craftsman Lawn Mower won't self-propel, check these items: * Ensure the belt is properly installed on the pulleys and moving freely. * Clear any debris clogging the drive operation after stopping the engine and disconnecting the spark plug boot. * Inspect the belt for damage or wear and replace if necessary. * Adjust the drive control, referring to the Drive Control Adjustment section in the Assembly section.
D
Donald BurkeAug 26, 2025
What causes a Craftsman Lawn Mower to idle poorly?
- H
  huntertravisAug 26, 2025
  Poor idling in your Craftsman Lawn Mower can be caused by: * A spark plug that is fouled, faulty, or has a gap that is too wide: Reset the gap or replace the spark plug. * A dirty air cleaner: Refer to Air Cleaner Maintenance in the Engine Manual.
C
Charles WelchAug 28, 2025
Why is my Craftsman 247.39775 engine running rough?
- J
  Jose DavisAug 28, 2025
  If your Craftsman Lawn Mower engine is running erratically, consider these potential causes: * A loose spark plug boot: Connect and tighten it. * Stale fuel: Replace it with fresh gasoline. * A plugged vent in the gas cap: Clear the vent. * Water or dirt in the fuel system: Run the engine until it stops, then refill with fresh fuel. * A dirty air cleaner: Refer to the Engine Manual for air cleaner maintenance. * A blocked fuel line: Contact your Sears Parts & Repair Center to have the fuel line cleaned.
C
Corey LawsonAug 31, 2025
How to reduce vibration on my Craftsman 247.39775?
- F
  Frank JordanAug 31, 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. * A bent cutting blade: Replace the blade.
L
Lisa ParkerSep 3, 2025
What to do if my Craftsman 247.39775 overheats?
- A
  Anthony SanchezSep 3, 2025
  If your Craftsman Lawn Mower engine is overheating: * Check the engine oil level and fill the crankcase with the proper oil if it's low. * Ensure there is no restriction to air flow around the engine. Clean the area around and on top of the engine.
A
amoralesSep 6, 2025
Why is my Craftsman Lawn Mower not mulching grass properly?
- R
  robertroweSep 6, 2025
  If your Craftsman Lawn Mower isn't mulching grass effectively: * Avoid mowing when the grass is wet; wait until it's drier. * If the grass is excessively high, mow once at a high cutting height, then again at the desired height, or narrow the cutting path. * Check if the blade is dull and sharpen or replace it.
K
Karen GonzalezSep 9, 2025
What causes my Craftsman 247.39775 to skip?
- M
  Michael RowlandSep 9, 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.
R
richardshannahSep 12, 2025
Why is there high pullback effort on my Craftsman Lawn Mower?
- J
  jonathandavidSep 12, 2025
  If you experience high pullback effort with your Craftsman Lawn Mower, it may be due to pulling the mower backwards before the transmission disengages. Allow the unit to roll forward slightly without the drive lever(s) engaged before pulling backwards.

Craftsman 247.39775 Specifications

General

Brand	Craftsman
Model	247.39775
Category	Lawn Mower
Language	English

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