Owner’s manual
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Where to find model number on mower?
On the Craftsman gas walk-behind mower model 917388011, the model and serial numbers are printed on a decal attached to the rear of the mower housing (deck). Use the model number when ordering parts and the serial number for identifying the exact production run; see the 917388011 owner's manual.
Where to look on the mower
Check these common decal locations on walk-behind mowers like 917388011:
- Rear of the mower housing (most common on this model)
- Back of the deck near the rear discharge area
- Under or near the rear guard (if equipped)
- On the side of the deck behind the engine (varies by build)
What you should write down
We recommend recording both numbers exactly as shown on the decal.
- Model number: identifies the mower design (example format: 917.388011)
- Serial number: identifies the specific unit
- Date of purchase: helpful for maintenance tracking
| Item | What it’s used for | Example you may see |
|---|---|---|
| Model number | Matching diagrams and parts | 917.388011 |
| Serial number | Identifying your exact unit | Varies |
Tips if the decal is hard to read
If the label is dirty, faded, or covered with grass residue:
- Wipe the area with a damp rag and mild soap
- Use a flashlight at an angle to make faint printing easier to see
- Take a close-up photo and zoom in to read the numbers
- Avoid harsh solvents that can remove the printing
Why it matters
Using the correct model number helps us match the right Craftsman walk-behind mower parts (like a control cable, blade adapter, or fasteners) to your exact deck and handle configuration, which prevents ordering the wrong replacement.
Last updated: January 2026
What model number is the Craftsman 917388011?
The model number for this Craftsman gas walk-behind lawn mower is 917.388011 (often written without the dot as 917388011). You can confirm it on the cover page of the 917388011 owner's manual, where it’s listed under “Model No.”
Where to find the model number on the mower
Most Craftsman walk-behind mowers place the model number on an ID label in one of these common spots:
- On the rear of the mower deck near the discharge opening
- On the top of the deck near the engine mounting area
- On the back of the handle support or handle bracket area
- Near the rear wheel height-adjustment area
- In the paperwork that came with the mower (manual and parts list)
Why the dot matters (917.388011 vs 917388011)
Both formats refer to the same mower. The dot is a formatting style used in many manuals and parts diagrams.
| You might see it as | What it means for parts lookup |
|---|---|
| 917.388011 | Same model; manual-style formatting |
| 917388011 | Same model; common online lookup format |
Why it matters for ordering parts
Using the exact model number helps us match the correct parts diagram and avoid ordering the wrong hardware or drive components.
- Deck and handle hardware can vary by model series
- Drive parts (like belts and brackets) can differ even when mowers look similar
- Engine parts are often tied to a separate engine model number listed in the manual
If you’re replacing drive components on this mower, the belt, 21-in 532406712 is one of the commonly referenced parts for this model.
Last updated: January 2026
Should I use 87 or 91 gas for lawn mower?
For the Craftsman gas walk-behind mower model 917388011, we recommend using regular unleaded 87-octane gasoline for normal mowing. Higher octane (like 91) does not add power in this type of small engine; fresh, clean fuel matters more than octane. See the fuel and operation guidance in the 917388011 owner's manual.
What to use (and what to avoid)
- Use fresh, regular unleaded 87 octane from a clean gas can.
- Avoid stale fuel; old gas is a common no-start cause.
- Keep fuel clean and dry; water in fuel can cause hard starting and rough running.
- Do not rely on higher octane to “fix” performance issues; address maintenance items instead.
- If you store fuel, use a stabilizer and follow the storage steps in the manual.
Quick comparison: 87 vs 91 for this mower
| Fuel choice | Best use | What you’ll notice |
|---|---|---|
| 87 octane (regular) | Everyday mowing | Normal starting and power when fuel is fresh |
| 91 octane (premium) | Not needed for normal operation | Typically no performance benefit in a standard mower engine |
If the mower runs poorly, check these first
Many “bad gas” symptoms are actually maintenance or airflow issues. Start here:
- Dirty air filter (can cause loss of power and hard starting)
- Stale fuel or water in fuel
- Spark plug condition and correct gap (the manual calls for .030 inch)
- Grass and debris buildup under the deck (can bog the engine)
- Blade or blade adapter looseness (inspect the blade mounting hardware)
If you’re servicing the blade area, a worn or damaged adapter can contribute to vibration and poor cutting; match parts by model and diagram, such as the lawn mower blade adapter 581547901 when applicable.
Why it matters
Using the right fuel helps the engine start easily and run consistently, but fuel freshness and cleanliness have the biggest impact on reliability. The manual also notes that rust or dirt in a gas can can create fuel problems, so storage habits directly affect performance.
Last updated: January 2026
