Craftsman 917378404 gas walk-behind lawn mower Parts

The most common issues we see on the Craftsman 917378404 gas walk-behind lawn mower involve starting problems, poor cut quality, and self-propel/drive issues. These usually trace back to routine wear items, cable or belt adjustment, and deck or wheel-drive hardware that needs cleaning, tightening, or replacement.

Common problems and what to check first

• Won’t start or starts then dies: old fuel, dirty air filter, fouled spark plug, or carburetor varnish.
• Uneven cut or vibration: bent/dull blade, loose blade hardware, or a worn blade adapter.
• Self-propel not pulling: worn/loose drive belt, damaged drive wheel teeth, or a stretched drive cable.
• Hard to pull back or wheels drag: debris in wheels, worn bearings, or axle issues.
• Handle controls feel loose: control bar/cable wear or misadjustment.

Parts that commonly wear on this model

If symptoms point to a worn part, these are frequent replacements for model 917378404:

• Premium blade 532406706 for poor cut quality or vibration from a damaged blade
• Lawn mower blade adapter 583134701 if the blade slips, wobbles, or the mounting is rounded
• Lawn mower ground drive belt, 3/8 x 33-9/16-in 532169778 for self-propel slipping or no drive
• Husqvarna lawn mower drive wheel, 8 x 2-in 532180775 if the drive wheel teeth are worn

Quick symptom-to-fix guide

Symptom	Most likely area	Typical fix
Rough cut, clumping	Blade, deck	Sharpen/replace blade; clean underside of deck
Strong vibration	Blade, adapter	Replace blade; inspect/replace adapter
No self-propel	Belt, cable, drive wheels	Replace belt; adjust cable; replace drive wheel
Wheels wobble	Axle, bearings	Inspect axle/bearings; replace worn hardware

Why it matters

Catching wear early protects the crankshaft, deck, and drive system. A damaged blade or loose adapter can create vibration that quickly turns a simple maintenance job into a bigger repair.

Helpful reference

For adjustment points, torque guidance, and diagrams specific to your mower, use the 917378404 owner’s manual.

Last updated: March 2026

The model number is 917.378404 (often written without the dot as 917378404) for this Craftsman gas walk-behind lawn mower. You’ll see this model number printed on the mower’s model and serial tag and throughout the parts diagrams in the 917378404 owner's manual.

Where to find the model number on the mower

Look for the model and serial label in common walk-behind mower locations:

• On the rear of the deck near the discharge opening
• On the back of the mower housing behind the engine
• Near the handle mounting area
• On a sticker or metal tag attached to the deck

Why the dot matters (917.378404 vs 917378404)

Both formats refer to the same mower; the dot is a formatting style used in some manuals and parts lists.

You might see it as	What it means	When it’s used
917.378404	Same model number	Common in manuals and diagrams
917378404	Same model number	Common on parts sites and labels

Tips for ordering the right parts

Using the exact model number helps match the correct blade, drive parts, and hardware for your mower.

• Match the full model number exactly: 917378404
• Use the parts diagram key numbers in the manual when identifying components
• If you’re replacing cutting parts, confirm deck size first (many are 21-inch on this series)
• For drive issues, the ground drive belt is a common wear item; see lawn mower wont move troubleshooting video motion drive failure

Why it matters

Craftsman model numbers can look similar across different mower families. Using 917378404 prevents ordering a belt, wheel, or control cable that fits a different chassis.

Last updated: January 2026

For a Craftsman gas walk-behind mower like model 917378404, the year is typically identified from the product’s serial number or date code on the mower’s ID label, not from the model number itself. Use the date-code format shown in the 917378404 owner's manual to confirm where the ID label is and how your mower is identified.

Where to find the serial number or date code

On most Craftsman walk-behind mowers, the ID label is on the mower deck or near the rear of the deck.

• Look on top of the deck near the engine mounting area
• Check the rear of the deck near the bagger door
• Wipe off grass and dirt so the full label is readable
• Write down the model number and serial number exactly as shown
• Take a photo of the label before it fades further

How the “year” is usually encoded

Craftsman serial/date coding varies by manufacturer and production run, but these are the most common patterns we see on walk-behind mowers:

What you see on the label	What it usually means	Example outcome
A full date (MM/DD/YYYY)	The build date is printed directly	07/28/2011 = built July 28, 2011
A 6-digit date code	Often MMDDYY (month, day, year)	072811 = July 28, 2011
A longer serial number	Year may be embedded; format varies	Use the label’s date field if present

If you only have the model number (917378404)

The model number identifies the mower design and parts family, but it does not reliably tell the build year by itself. For year lookup, the serial number or date code on the ID label is the deciding detail.

Why it matters

Knowing the build year helps you match the correct parts and diagrams for drive components, wheels, and cutting parts. For example, the correct 21-in deck mulching blade and drive hardware for this mower can differ across similar-looking models; using the right ID info prevents ordering the wrong item (such as the premium blade 532406706).

Last updated: January 2026