Craftsman CMXGMAM1125503

Questions and Answers

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amy68Aug 15, 2025
Why won't my Craftsman Lawn Mower start?
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  Diane LynchAug 16, 2025
  Several factors could prevent your Craftsman Lawn Mower from starting. Ensure the blade control is engaged and the spark plug boot is connected. Check if the fuel tank is empty or contains stale fuel; if so, refill with fresh gasoline. If your mower has a primer, prime the engine as instructed. Inspect the spark plug for faults and clean, adjust the gap, or replace if necessary. If the engine is flooded, wait a few minutes before restarting. Finally, a blocked fuel line could be the issue, in which case you should contact your Parts & Repair Center to have it cleaned.
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hmillerAug 18, 2025
What to do if Craftsman CMXGMAM1125503 Lawn Mower with electric starter fails to start?
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  conradrebekahAug 18, 2025
  If your Craftsman electric start lawn mower isn't starting, make sure the Electric Starter Push Key is fully inserted until it snaps into place. Also, ensure the battery is charged by referring to the Battery Charger Instructional Manual. Finally, if the circuit breaker tripped, stop the engine, remove the Electric Starter Push Key, and disconnect the spark plug boot. Check for and carefully remove any grass or debris obstructing the blade. Reattach the spark plug boot and reinsert the Electric Starter Push Key. Wait one minute for the circuit breaker to automatically reset before trying to start again.
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conleyronaldAug 21, 2025
Why is my Craftsman Lawn Mower engine running erratically?
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  Jeffery GrossAug 21, 2025
  An erratic running engine in your Craftsman Lawn Mower can stem from several causes. First, check that the spark plug boot is securely connected and tightened. Stale fuel can also cause this issue, so replace it with fresh gasoline. Ensure the vent in the gas cap isn't plugged. Water or dirt in the fuel system might be the culprit; run the engine until it stops from lack of fuel, then refill with fresh fuel. If the air cleaner is dirty, refer to the Engine Manual for Air Cleaner Maintenance instructions. Lastly, a blocked fuel line could be the problem, requiring professional cleaning.
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James IrwinAug 25, 2025
Why won't my Craftsman CMXGMAM1125503 self propel?
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  Cody DavisAug 25, 2025
  If your Craftsman Lawn Mower isn't self-propelling, check the belt for proper pulley installation and movement. Clear any debris clogging the drive operation by stopping the engine and disconnecting the spark plug boot before cleaning. Inspect the belt for damage or wear, and consider having it replaced. Also, the drive control might be out of adjustment, refer to page 10 in the Assembly & Set-up section for adjustment instructions.
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Laura WeaverAug 27, 2025
Why does my Craftsman CMXGMAM1125503 Lawn Mower leave an uneven cut?
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  Michael SmithAug 27, 2025
  An uneven cut with your Craftsman Lawn Mower can be caused by a few things. Make sure the wheels are positioned correctly by adjusting the cutting height lever on the right front and right rear wheels to the same position. Also, a dull blade can contribute to an uneven cut, so sharpen or replace it.
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Scott MullinsAug 30, 2025
What to do if my Craftsman CMXGMAM1125503 engine overheats?
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  April ThomasAug 30, 2025
  If your Craftsman Lawn Mower engine is overheating, start by checking the engine oil level and fill the crankcase with the proper oil if it's low. Also, ensure that there are no restrictions to air flow around the engine by cleaning the area around and on top of it.
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Lindsey MccoySep 2, 2025
How to reduce excessive vibration in my Craftsman Lawn Mower?
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  jessica54Sep 3, 2025
  Excessive vibration in your Craftsman Lawn Mower could be due to a loose or unbalanced cutting blade. Try tightening the blade and adapter, and balance the blade. If the cutting blade is bent, it will need to be replaced.
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anne11Sep 5, 2025
Why isn't my Craftsman CMXGMAM1125503 mulching grass properly?
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  norrisgrantSep 5, 2025
  If your Craftsman Lawn Mower isn't mulching grass effectively, it could be due to wet grass; avoid mowing in wet conditions and wait for the grass to dry. Excessively high grass can also hinder mulching, so mow once at a high cutting height, then mow again at the desired height or make a narrower cutting path. Finally, a dull blade will impact mulching performance, so sharpen or replace it.
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Carlos GibsonSep 8, 2025
Why does my Craftsman CMXGMAM1125503 idle poorly?
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  Debbie HardySep 8, 2025
  Poor idling in your Craftsman Lawn Mower can be attributed to a spark plug that is fouled, faulty, or has a gap that is too wide; reset the gap or replace the spark plug. Another potential cause is a dirty air cleaner, in which case you should refer to the Engine Manual for Air Cleaner Maintenance.
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Laura MillerSep 12, 2025
What causes occasional skips in my Craftsman CMXGMAM1125503?
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  Anna EvansSep 12, 2025
  Occasional skipping or hesitation in your Craftsman Lawn Mower could be due to a spark plug gap that is too close. Adjust the gap, referring to the Spark Plug Maintenance section in the Engine Manual.

Summary

Safety Instructions

Slope Operation Safety

Guidelines for safe operation on slopes, including avoiding steep angles, mowing across, and maintaining footing.

Child Safety

Slope Gauge

How to Use Slope Gauge

Provides step-by-step instructions on using the fold-out slope gauge to determine if a slope is safe for mower operation.

Assembly

Handle Setup and Securing

Guides through the process of assembling and securing the mower's handles, accommodating different handle types.

Adjustments

Cutting Height Adjustment

Procedure for adjusting the mower's cutting height using the levers located near the wheels.

Drive Control Adjustment

Details on adjusting the drive belt tension using the adjustment wheel for proper self-propel operation.

Operation

Mower Component Identification

Diagram and labels identifying all major controls and components of the lawn mower for operational reference.

Operating Controls Overview

Explanation of how to use key controls like Blade Control, Drive Control, Electric Starter, and Recoil Starter.

Gas and Oil Fill-Up Procedure

Instructions for safely filling the engine with gasoline and oil before starting the mower.

Starting and Stopping the Engine

Procedures for safely starting and stopping the mower engine, including necessary precautions.

Mowing Operation

Guidance on preparing the lawn and operating the mower, including using drive controls and safety measures.

Service and Maintenance

Maintenance Schedule Overview

Blade Service and Balance

Detailed steps for removing, sharpening, balancing, and reinstalling the mower blade safely.

Troubleshooting

Engine Starting Issues

Engine Running and Performance Issues

Performance and Drive Issues

Craftsman CMXGMAM1125503 Specifications

General

Engine Type	Gas
Engine Brand	Briggs & Stratton
Cutting Width	21 inches
Start Type	Pull Start
Deck Material	Steel
Height Adjustment	Single Lever
Drive Type	Self-Propelled
Mulching Capability	Yes
Side Discharge	Yes
Rear Bagging	Yes
Cutting Height	1.25 to 3.75 inches
Drive System	Rear-Wheel Drive
Speed Settings	Variable
Warranty	2 years
Fuel Tank Capacity	1.6 qt