Craftsman 917378910 gas walk-behind lawn mower Parts

For a Craftsman gas walk-behind mower model 917378910, the serial number usually includes a date code that indicates when the mower was manufactured. We recommend matching your serial number format to the identification section in the 917378910 owner's manual so you can decode the build month and year correctly.

Where to find the serial number

On most Craftsman walk-behind mowers, the serial/model ID label is typically in one of these spots:

• On the mower deck near the rear wheel area
• On the top of the deck near the engine mounting area
• On the rear discharge door or rear skirt area
• Near the height adjuster hardware

How to decode the date from the serial number

Serial number formats vary by production run, but these patterns are the most common ways a date is embedded:

• MMDDYY: month, day, year (example: 041523 = April 15, 2023)
• YYMMDD: year, month, day (example: 230415 = April 15, 2023)
• YYMM or MMYY: year and month only (example: 2304 = April 2023)
• Week/year code: a 2-digit week plus a 2-digit year (example: 1423 = week 14 of 2023)

Quick check steps

• Write down the full serial number exactly as shown (include letters).
• Look at the first 4 to 6 characters for a numeric block that resembles a date.
• If multiple patterns seem possible, use the manual’s ID label example to confirm the correct order.

Common serial number clues (what to look for)

What you see in the serial number	What it often means	What you get
6 digits in a row	Full date code	Month/day/year or year/month/day
4 digits in a row	Partial date code	Month/year or year/month
Letters followed by digits	Plant/line code + date	Use the first clear numeric block

Why it matters

Knowing the manufacture date helps us match the right parts and revisions for your mower, especially for wear items like a blade, drive belt, or transmission components that can change across production runs.

Last updated: January 2026

The model number for this Craftsman gas walk-behind lawn mower is 917378910. Use 917378910 when ordering parts, looking up diagrams, or checking maintenance procedures in the 917378910 owner's manual.

Where to find the model number on the mower

We recommend confirming the model number directly on the mower tag so you match the correct parts list.

• Check the rear of the deck near the discharge opening
• Look along the top of the deck near the engine mounting area
• Inspect the handle support/bracket area where labels are often placed
• Wipe off grass and oil; the tag can be hard to read when dirty

Why the exact model number matters

Craftsman walk-behind mowers can look similar across years, but parts like the blade, drive belt, and transmission can vary by model number.

What you are doing	What to use	Why it helps
Ordering replacement parts	Model number 917378910	Ensures correct fit and mounting style
Using diagrams	Model number 917378910	Matches the right exploded views
Maintenance and adjustments	917378910 owner's manual	Uses the correct procedures and specs

Common parts that depend on the model match

If you are shopping for wear items, always match them to 917378910 first.

• Husqvarna lawn mower 22-inch deck 3-in-1 blade 532421825 (deck and mounting must match)
• Ground drive belt (length and width must match)
• Control cable (end fittings and routing must match)
• Wheels and height adjuster hardware (axle and hub style must match)

Why it matters

Using the correct model number prevents wrong-part returns and helps your mower cut, bag, and self-propel the way it was designed.

Last updated: January 2026

For the Craftsman 917378910 gas walk-behind lawn mower, we recommend using fresh regular unleaded 87-octane gas; higher octane (like 91) does not add power or protection in a small mower engine when the manufacturer calls for regular fuel. For the exact fuel guidance for your mower, follow the 917378910 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 “premium” 91-octane as a solution for hard starting; it usually does not fix fuel-system problems.
• Avoid old gas (more than about 30 days without stabilizer).

Quick comparison

Fuel choice	Works in most mowers	Best for storage	Common downside
87 octane (regular)	Yes	Fair	Can go stale if stored
91 octane (premium)	Yes	Fair	Costs more; no performance gain
Ethanol-free (often 87-90)	Yes	Best	Not available everywhere

Why it matters

Using the right fuel helps prevent hard starting, surging, and carburetor varnish. Most “mower won’t start” complaints trace back to stale fuel or ethanol-related moisture issues, not octane rating.

If your mower is hard to start after fueling

• Drain old fuel and refill with fresh 87.
• Check the air filter and spark plug condition.
• Make sure the blade spins freely (with the spark plug wire disconnected).
• If the pull cord will not pull, follow lawn mower pull cord stuck.

Last updated: January 2026