Craftsman 917383640 lawn mower Parts

The most common issues we see with the Craftsman 917383640 walk-behind gas mower are no-start or hard-start problems, poor cutting quality, and drive or height-adjustment issues. Many fixes come down to basic maintenance, correct blade mounting, and tightening or replacing worn hardware; use the 917383640 owner's manual for model-specific procedures.

Common symptoms and what usually causes them

• Won’t start / starts then dies: old fuel, dirty air filter, fouled spark plug, carburetor varnish
• Runs rough / surges: partially clogged carburetor, stale fuel, restricted airflow
• Cuts uneven or leaves strips: dull/bent blade, blade adapter wear, deck buildup, incorrect cutting height
• Excess vibration: damaged blade, loose fasteners, worn blade adapter
• Self-propel issues (if equipped): cable out of adjustment, worn drive components, debris binding wheels

Quick checks we recommend first

1. Turn the engine off and disconnect the spark plug wire.
2. Drain old fuel and refill with fresh gasoline (use fuel stabilizer if stored).
3. Inspect the blade and mounting stack; a worn adapter can cause wobble and poor cut.
4. Check for loose handle and deck hardware; tighten as needed.
5. Clean grass buildup under the deck (scrape, do not pressure-wash bearings).

Parts that commonly relate to these problems

If you find looseness or wobble at the blade, the adapter and mounting hardware are frequent culprits.

Issue	What to inspect	Example part on this model
Vibration, uneven cut	Blade mounting interface	Lawn mower blade adapter 581547901
Handle feels loose	Handle fasteners/knobs	Handle knob 532185577
Height/handle hardware missing	Clips/bolts	Retainer clip 532085179

Why it matters

Addressing these issues early prevents deck damage, reduces vibration that can loosen fasteners, and improves cut quality. It also helps the engine start easier and run cooler, which extends mower life.

Last updated: March 2026

The model number for this Craftsman walk-behind mower is 917.383640 (often written without the dot as 917383640). You’ll find it on a decal attached to the rear of the mower housing; confirm it there before ordering parts or using the owner’s manual.

Where to find the model number on the mower

Look for the identification decal in this location:

• Rear of the lawn mower housing (back of the deck)
• On a sticker or metal tag that also lists the serial number
• Near the discharge area on the rear portion of the deck (varies by build)
• Not on the engine shroud (that location is for the engine model)

Lawn mower model number vs. engine model number

This mower has two different identifiers. Use the mower model number for chassis parts (handle hardware, wheels, deck parts) and the engine model number for engine-specific parts.

What you’re identifying	Where it’s found	Example from this mower
Lawn mower model number	Rear of mower housing decal	917.383640 (917383640)
Engine model number	Engine blower housing near spark plug	143.434312

Tips for ordering the right parts

When you’re matching parts to Craftsman model 917383640, these steps prevent wrong-part returns:

• Record the full model number and serial number from the rear decal
• Match part diagrams and key numbers in the 917383640 owner’s manual
• Replace missing or stripped handle hardware with exact-fit items such as the handle knob 532185577 when applicable
• If blade hardware is being serviced, inspect the blade adapter and fasteners for wear

Why it matters

Craftsman model numbers can look similar across different 20-inch and 21-inch walk-behind mowers. Using 917383640 ensures you get the correct diagrams, specifications (like blade bolt torque), and compatible parts for your exact deck and handle configuration.

Last updated: January 2026

On Craftsman walk-behind mower model 917383640, the serial number is used to identify your specific unit, but the year is not reliably determined from the serial number alone. We recommend using the serial number from the rear-housing decal along with the model number when checking documentation and ordering parts using the 917383640 owner's manual.

Where to find the model and serial number

The model and serial numbers are printed on a decal attached to the rear of the lawn mower housing.

• Look on the back of the mower deck (rear housing area)
• Write down the full model number: 917383640
• Write down the full serial number exactly as shown
• Record your purchase date if you know it
• Keep the information with your mower paperwork for future reference

How to use the serial number (what it is best for)

For this Craftsman mower, the serial number is most useful for matching the correct parts and service information.

What you need	Where it’s used	Why it matters
Model number (917383640)	Parts diagrams and repair parts lists	Ensures you’re viewing the correct mower breakdown
Serial number	Service identification	Helps distinguish your exact unit configuration
Engine model number	Engine-specific parts	Engine parts are matched to the engine, not just the mower

Ordering parts the right way

This mower and its engine use separate identifiers. When ordering, we use the mower model number plus the part number and description; for engine parts, we use the engine model number found near the spark plug.

• Mower model number: 917383640
• Engine model number location: blower housing near the spark plug
• Use the parts list description to avoid mix-ups (bolt vs. screw vs. washer)
• Replace missing handle hardware with exact matches when possible, such as the handle knob 532185577

Why it matters

Serial-number-to-year charts vary by product line and era; using the model number and the correct manual prevents ordering the wrong blade adapter, fasteners, or control parts for your specific Craftsman walk-behind mower.

Last updated: January 2026