Craftsman CMXGMAM1125506 gas lawn mower Parts

For your Craftsman CMXGMAM1125506 gas walk-behind mower, the model number is typically printed on a product label on the mower deck (often near the rear discharge area) or on the rear housing near the handle mounting points. Once you have it, use it to match the correct blade, belt, and control parts.

Where to look on a walk-behind mower

Check these common label locations (wipe off grass and dirt first):

• Top of the mower deck, near the engine mounting area
• Rear of the deck, behind the engine or near the bagging opening
• Side of the deck near a rear wheel height adjuster
• Rear housing near where the handle bolts to the deck
• On a sticker or metal tag that may include both model and serial numbers

What the model number helps you match

Using the exact model number prevents ordering the wrong size or style of part.

What you’re replacing	Why the model number matters	Example part on this model page
Blade	Deck size and center mounting pattern must match	Craftsman lawn mower 23-in deck 3-in-1 blade 742P05019
Drive belt	Belt length and profile must match the drive system	Craftsman lawn mower ground drive belt 754P05934
Control cable	Cable length and end fittings must match the handle controls	Zone control cable (listed for this model)

Tips to avoid mix-ups

• Copy the model number exactly as printed (letters, numbers, and dashes)
• Take a clear photo of the label before it wears further
• If the label is damaged, compare your mower’s key parts (blade, belt, cables) to the parts list for CMXGMAM1125506
• When ordering, match by model first, then confirm the part name and part number

Why it matters

Walk-behind mowers often look similar across multiple Craftsman and MTD-built versions, but small differences in deck design, drive system, and handle controls change which blade adapter, belt, or cable fits correctly.

Last updated: February 2026

For a Craftsman CMXGMAM1125506 gas walk-behind mower, use fresh unleaded gasoline with 10% ethanol or less (E10 max). Avoid E15 and E85 fuels because higher ethanol blends can cause hard starting, poor running, and fuel-system damage in small engines.

What to use (and what to avoid)

• Use fresh, clean unleaded gas (regular pump gas is fine)
• Choose E0 (no ethanol) if it’s available; otherwise E10
• Use fuel that’s 30 days old or less (or treat it with stabilizer)
• Avoid E15 and E85 (higher ethanol blends)
• Avoid old gas that smells sour or looks dark

Quick fuel guide

Fuel at the pump	Ethanol content	Use in CMXGMAM1125506?	Why
E0	0%	Yes	Best storage and drivability
E10	Up to 10%	Yes	Common and generally safe for small engines
E15	15%	No	Runs hotter, attracts moisture, can damage fuel system
E85	51% to 85%	No	Not designed for small engines

Why it matters

Small-engine carburetors and fuel lines are sensitive to ethanol. Higher ethanol blends absorb moisture and can leave varnish deposits, which leads to clogged jets, surging, and no-start conditions.

If the mower won’t start after fueling

• Drain the tank and refill with fresh E0 or E10
• Check the cap seal and venting; a bad cap can restrict fuel flow (see fuel cap 84004416)
• Inspect the zone control cable adjustment if the engine won’t stay running (see lawn mower zone control cable 946-05107B)
• Replace stale fuel and consider using stabilizer for storage

Last updated: February 2026

Common problems on the Craftsman CMXGMAM1125506 gas lawn mower are no-start or hard-start, rough running, poor cutting quality, and self-propel/drive issues. Most fixes start with fuel quality, ignition, airflow, and making sure the blade and drive system parts are in good condition.

Most common symptoms and what they usually mean

• Won’t start / starts then dies: stale fuel, dirty carburetor, fouled spark plug, clogged air filter
• Runs rough / surges: restricted fuel flow, dirty carburetor jets, air leak, old fuel
• Cuts unevenly / leaves strips: dull or bent blade, blade adapter wear, deck buildup
• Self-propel won’t move or slips: worn or stretched drive belt, cable out of adjustment, worn wheels
• Fuel smell or seepage: loose or damaged fuel cap, cracked fuel line (if equipped)

Quick checks we recommend (fastest to slowest)

1. Use fresh fuel (drain old fuel if it smells sour or looks dark).
2. Check the spark plug (clean/replace if fouled; confirm the wire is firmly seated).
3. Inspect the air filter (clean or replace if dirty).
4. Look under the deck (with the spark plug wire disconnected) for packed grass and blade damage.
5. Verify drive operation (engage the drive; watch for belt slip and cable slack).

Parts that commonly solve these problems

If you’re seeing the symptoms above, these model-matched parts are frequent fixes:

Problem area	What you notice	Part that often helps
Cutting performance	ragged cut, vibration, missed grass	Craftsman lawn mower 23-in deck 3-in-1 blade 742P05019
Drive/self-propel	mower won’t pull, slips, weak drive	Craftsman lawn mower ground drive belt 754P05934
Fuel sealing	fuel odor, cap won’t tighten, seepage	Fuel cap 84004416

Why it matters

A mower that runs lean from fuel restriction or cuts poorly from a worn blade works harder, vibrates more, and can shorten the life of the engine and drive components. Fixing the basics early usually prevents bigger repairs later.

Last updated: February 2026