Craftsman 917388880 rotary lawn mower Parts

The model number for this Craftsman walk-behind mower is 917388880. You will typically find it on the mower’s model and serial number label; match that number exactly when ordering parts or using the Craftsman 917388880 owner's manual.

Where to find the model number on the mower

On most Craftsman rotary lawn mowers, the model and serial label is placed where it stays readable but protected from debris.

• Check the rear of the deck near the discharge opening
• Look around the engine mounting area on the deck
• Inspect the handle support or rear frame area
• Wipe off grass and oil film so the full number is visible

What to write down (and why)

Record the full model number and the serial number before you shop for parts or troubleshoot.

Item	Example for this mower	Why it matters
Model number	917388880	Ensures diagrams and parts lists match your exact mower
Serial number	(from your label)	Helps confirm production run and correct part variations

Why it matters

Craftsman mowers often have similar-looking decks and handles across multiple years. Using the exact model number 917388880 prevents ordering the wrong blade, wheel, or control cable and saves time during repairs.

Parts that commonly require an exact model match

If you are replacing wear items, confirm fit by model number first.

• Blade and blade mounting hardware
• Drive and control cables
• Wheels, height adjuster parts, and brackets
• Handle fasteners and knobs

For example, this model uses a specific 21-inch deck blade; see the husqvarna lawn mower 21-in deck 3-in-1 blade 532189028 if you are replacing the cutting blade.

Last updated: January 2026

For the Craftsman rotary lawn mower model 917388880, use 87-octane (regular) unleaded gasoline for normal mowing. Higher octane (like 91) does not add power or protect the engine in this type of mower; fresh fuel and correct maintenance matter more. See the fuel guidance in the 917388880 owner's manual.

What to use (and what to avoid)

• Use fresh 87-octane unleaded from a busy station.
• Use ethanol-free fuel when available; it stores better and helps reduce carburetor issues.
• If you must use E10 (10% ethanol), keep it fresh and do not store it long-term.
• Avoid old gas (more than about 30 days without stabilizer).
• Avoid E15/E85; higher ethanol blends commonly cause hard-starting and fuel-system damage.

Why 91 octane usually is not better

Octane is mainly about preventing knock in high-compression engines. Most walk-behind mower engines are designed to run correctly on regular fuel, so 91 octane typically provides no benefit for starting, power, or engine life.

Quick comparison

Fuel choice	OK for 917388880?	Best use case
87 octane regular	Yes	Everyday mowing
91 octane premium	Yes (but unnecessary)	Only if it is the freshest fuel available
Ethanol-free (87-90)	Yes	Best for storage and fewer carb issues
E15/E85	No	Not recommended for mower engines

If you are storing the mower

• Add fuel stabilizer and run the engine a few minutes to circulate it.
• Or drain the tank and run the carburetor dry.
• Follow seasonal steps in the how to winterize a lawn mower guide.

Why it matters

Using the right fuel helps prevent varnish buildup in the carburetor, reduces hard-start complaints, and keeps the engine running smoothly. Most “fuel problems” on walk-behind mowers come from stale gas, not low octane.

Last updated: January 2026

For Craftsman walk-behind mower model 917388880, the mower serial label identifies the unit, but the most dependable way to date it is to use the identification guidance in the 917388880 owner's manual and, when needed, the engine model and code stamped on the engine. Together, those IDs pinpoint the build timeframe.

Step 1: Find the correct ID label (mower vs. engine)

On a Craftsman rotary lawn mower, you will usually see two different identification areas. Check:

• Mower model and serial label on the mower deck (often near the rear or side of the deck)
• Label or stamping near the handle mounting area
• Engine identification on the engine shroud, valve cover, or blower housing
• Any separate engine “model/type/code” line (this is often the date key)

Step 2: Use the manual’s identification section first

Craftsman serial formats are not universal across all 917-series mowers; the manual’s identification section is the correct reference for 917388880.

• Match the label headings (model, serial, DOM, code, etc.) to what you see
• Write the serial exactly, including letters and leading zeros
• If the mower label does not show a clear date, record the engine model and code

Common date-code styles you may see (what they mean)

These are the most common ways outdoor power equipment is dated; use only the pattern that matches your label or engine code.

Code style	Example	How it reads
Year + week	24 12	2024, week 12
Year + Julian day	24 165	2024, 165th day
Full numeric date	20240615	June 15, 2024

Why it matters

Knowing the build timeframe helps us match the correct parts when a mower has running changes, such as blade style, wheel hardware, or control cable routing.

• Avoids ordering the wrong blade or adapter
• Helps match deck and handle hardware
• Supports maintenance planning (tune-up intervals, blade service)

Last updated: January 2026