Craftsman 247.38903 User Manual

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Operator's Manual

CRRFTSMRH

21" LAWN MOWER

Model No. 247.38903

CAUTION: Before using

this product, read this

manual and follow all

safety rules and operating

instructions.

o SAFETY

ASSEMBLY

OPERATION

MAINTENANCE

PARTS LIST

o ESPANOL, p. 33

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

Visit our website: www.craftsman.com FORMNO.769-05426A

1/11/2010

Table of Contents

Questions and Answers:

R
Roger TapiaJul 29, 2025
Why won't my Craftsman 247.38903 Lawn Mower start?
- M
  Michael GarciaJul 30, 2025
  There are several reasons why your Craftsman Lawn Mower might not start. It could be due to a disengaged blade control, so ensure that the blade control is engaged. Another common cause is a disconnected spark plug boot; check and connect the wire to the spark plug boot. Also, the fuel tank might be empty or contain stale fuel, so fill the tank with clean, fresh gasoline. A faulty spark plug can also prevent starting; in this case, clean, adjust the gap, or replace the spark plug. If the engine is flooded, wait a few minutes before attempting to restart it. Finally, a blocked fuel line can cause this issue, in which case you should contact your Sears Parts & Repair Center to have the fuel line cleaned.
C
Cathy BrooksAug 3, 2025
Why is my Craftsman 247.38903 Lawn Mower engine overheating?
- B
  Brian SawyerAug 3, 2025
  If your Craftsman Lawn Mower engine is overheating, it could be due to a low engine oil level. Fill the crankcase with the proper oil. Another possible cause is restricted airflow, so clean the area around and on top of the engine.
P
Paul ThompsonAug 7, 2025
What causes an uneven cut with my Craftsman 247.38903 Lawn Mower?
- C
  Christian SmithAug 7, 2025
  An uneven cut with your Craftsman Lawn Mower can be due to a couple of reasons. First, check that the wheels are positioned correctly by adjusting the cutting height lever on the right front and right rear wheel to the same position. Also, a dull blade can cause an uneven cut, so sharpen or replace the blade.
T
Tanya DavisAug 12, 2025
What to do if my Craftsman Lawn Mower idles poorly?
- M
  Mary MccartyAug 12, 2025
  If your Craftsman Lawn Mower idles poorly, it could be due to a spark plug that is fouled, faulty, or has a gap that is too wide. Reset the gap to .030” or replace the spark plug. A dirty air cleaner may also be the cause, so refer to the Air Cleaner section in the Engine Maintenance section.
J
Jennifer WatkinsAug 15, 2025
What to do if my Craftsman 247.38903 Lawn Mower engine runs erratically?
- S
  Stephen MayAug 16, 2025
  If your Craftsman Lawn Mower engine is running erratically, several factors could be the cause. First, check the spark plug boot and ensure it is connected and tightened. Stale fuel can also cause this issue, so fill the tank with clean, fresh gasoline. A plugged vent in the gas cap might be the problem; try clearing the vent. 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 the Engine Maintenance section. Finally, a blocked fuel line can cause this, and you should contact your Sears Parts & Repair Center to have the fuel line cleaned.
J
Jose DukeAug 19, 2025
How to reduce excessive vibration in my Craftsman Lawn Mower?
- U
  uhernandezAug 20, 2025
  Excessive vibration in your Craftsman Lawn Mower can often be attributed to a loose or unbalanced cutting blade. Make sure to tighten the blade and adapter, and balance the blade. Another cause could be a bent cutting blade, which would require replacing the blade.
J
Jennifer CrossAug 25, 2025
Why won't my Craftsman 247.38903 Lawn Mower mulch grass properly?
- A
  Adam KellyAug 25, 2025
  If your Craftsman Lawn Mower isn't mulching grass properly, it could be due to several factors. Mowing wet grass can prevent proper mulching, so wait until the grass is dry before cutting. Excessively high grass can also be a problem; mow once at a high cutting height, then mow again at the desired height or make a narrower cutting path. A dull blade will also affect mulching performance, so sharpen or replace the blade.

Craftsman 247.38903 Specifications

General

Deck Material	Steel
Weight	78 lbs
Engine Brand	Briggs & Stratton
Engine Size	140cc
Engine Displacement	140 cc
Cutting Height Positions	6
Cutting Width	21 inches
Start Type	Recoil
Drive Type	Self-propelled
Cutting Height	1.25-3.75 inches
Wheel Size	8 inches

Summary

SAFETY INSTRUCTIONS

General Operation

Read and follow all instructions before operating the mower.

SLOPE OPERATION AND SAFETY

Slope Operation

Guidance on mowing on slopes, including maximum angle.

Children Safety

Instructions to keep children away from the mower during operation.

ASSEMBLY

Carton Opening and Handle Assembly

OPERATION

Blade Control and Cutting Height

Explanation of blade control and cutting height adjustment levers.

Gas and Oil Fill-Up

Instructions for filling the fuel tank and checking engine oil.

Starting and Stopping the Engine

Step-by-step procedures for starting and stopping the mower engine.

SERVICE AND MAINTENANCE

Maintenance Schedule and Oil Check

Schedule for regular maintenance tasks and checking engine oil.

Engine Maintenance: Spark Plug and Air Cleaner

Cleaning Deck and Blade Care

OFF-SEASON STORAGE

Preparing Engine for Storage

Steps to prepare the engine for long-term storage to prevent damage.

TROUBLESHOOTING

PARTS LIST

Engine Parts Breakdown

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