Craftsman 917378980 gas walk-behind lawn mower Parts

On the Craftsman gas walk-behind lawn mower model 917378980, the model and serial numbers are printed on a decal on the rear of the lawn mower housing. Write down both numbers; you will need them to look up the correct parts list and manual.

Where to look on model 917378980

Check these common spots in this order:

• Rear of the mower housing (primary location for this model)
• Rear panel area just above the deck, near the discharge opening
• Handle mounting area on the deck (near the lower handle bolts)
• Engine shroud area (near the recoil starter housing)

If the decal is dirty or faded, wipe the area with a damp rag first; avoid scraping so you do not remove the printed information.

What to record (and why)

Use this quick checklist so you have everything needed for parts matching:

• Model number (example: 917378980)
• Serial number (unique to your mower)
• Date of purchase (helpful for maintenance records)

Model vs. serial number

Item	What it tells us	Used for
Model number	The exact mower design and parts breakdown	Correct diagrams and part compatibility
Serial number	Your specific unit’s production run	Confirming revisions when ordering

Why it matters

Using the correct model number prevents ordering the wrong blade, belt, or drive parts. For example, this mower uses a specific 22-inch blade design; matching by model helps ensure the replacement fits and the blade bolt torque and safety clearances stay correct.

For diagrams and the exact decal location callouts, use the 917378980 owner’s manual.

Last updated: February 2026

For a Craftsman gas walk-behind lawn mower model 917378980, it’s cheaper to repair when the problem is routine maintenance or a single worn part; replacement makes more sense when the engine or drive system needs major work or the mower needs frequent fixes. Use the 917378980 owner's manual maintenance schedule to keep repair costs low.

A simple cost rule we use

• Repair when the fix is basic maintenance (blade, belt, cable, cleaning, tune-up items).
• Replace when a single repair estimate is about half or more of the cost of a comparable new mower.
• Replace when reliability is poor (multiple breakdowns in a season) and you are repeatedly buying parts and paying labor.

Repairs that are usually worth it on this model

The manual emphasizes routine upkeep (spark plug, air filter, blade condition, cleaning under the deck) because these items strongly affect performance and longevity.

Common “worth it” repairs include:

• Sharpening or replacing a worn or bent blade
• Cleaning packed grass from under the deck and drive wheel areas
• Replacing a worn ground drive belt
• Replacing a stretched or damaged control cable
• Seasonal tune-up items (spark plug, air filter)

Helpful parts examples for this model:

• Lawn mower blade 532406713
• Lawn mower ground drive belt 532189922

When replacement is usually the better value

Replacement typically wins when:

• The engine has internal damage (low compression, severe smoking, crankshaft issues)
• The drive system has multiple worn components and still will not propel reliably
• The mower has been difficult to start or keep running even after normal tune-up steps

Quick comparison

Situation	Usually cheaper	Why
Blade is dull, mower cuts poorly	Repair	Low parts cost; immediate improvement in cut quality
Mower will not self-propel but engine runs fine	Repair	Often belt, cable, or debris in drive wheel area
Engine runs poorly after basic tune-up	Depends	Diagnosis can escalate; replacement may be smarter if costs climb

Why it matters

A well-maintained mower costs less over time. The manual notes that warranty value and long-term performance depend on regular maintenance and periodic adjustments, especially blade care, cleaning, and annual tune-up items.

Last updated: February 2026

Common problems on the Craftsman gas walk-behind mower model 917378980 are no-start conditions (stale fuel, dirty air filter, bad spark plug, disconnected plug wire), loss of power from airflow or deck buildup, and excessive vibration from a worn or loose blade. Use the 917378980 owner's manual troubleshooting chart to match symptoms to fixes.

Most common symptoms and what usually causes them

• Won’t start: dirty air filter, out of fuel, stale fuel, water in fuel, spark plug wire disconnected, bad spark plug, control bar released/defective
• Loss of power: dirty air filter, cutting too much grass, grass and debris buildup under the deck, too much oil in the engine
• Excessive vibration: worn/bent/loose blade, uneven wheel height, debris under the mower, bent crankshaft (after impact)
• Starter rope hard to pull: blade dragging in grass, cutting height too low, debris under deck, possible crankshaft damage after striking an object
• Hard to push or drive slows: grass too high, cutting height too low, drive system wear (belt, pulleys, control cable)

Quick checks we recommend first (fast, high-impact)

1. Fuel: drain old gas and refill with fresh, clean gasoline.
2. Airflow: inspect and clean or replace the air filter.
3. Ignition: confirm the spark plug wire is firmly seated; replace the spark plug if fouled.
4. Safety/control: hold the control bar fully against the handle while starting.
5. Under-deck buildup: tip the mower safely and remove packed grass and debris.

Parts that commonly solve vibration or cutting complaints

If you see a bent blade, rounded cutting edges, or vibration after hitting something, replacing the blade is often the correct fix.

Symptom	Common fix	Example part for 917378980
Vibration, rough cut	Replace blade; tighten hardware	Lawn mower blade 532406713
Poor bagging, clumping	Clean deck; sharpen/replace blade	Lawn mower blade 532406713
Starter rope hard to pull	Raise cutting height; clear deck	(cleaning and adjustment)

Why it matters

Ignoring no-start and vibration symptoms can lead to harder starting, poor cut quality, and accelerated wear on the crankshaft, blade adapter, and drive components. Basic maintenance and correct blade condition prevent most repeat failures.

Last updated: February 2026

The model number for this Craftsman gas walk-behind lawn mower is 917.378980 (often written without the dot as 917378980). You can confirm it on the mower’s model tag and in the owner's manual for model 917378980.

Where to find the model number on the mower

Most Craftsman walk-behind mowers list the model number on a label or stamped tag. Check these common spots:

• Rear of the deck near the discharge opening
• Top of the deck near the engine mounting area
• Behind the rear wheels on the deck housing
• On the handle support or handle bracket area
• In the manual’s cover page and parts breakdown

Model number vs. engine model number (common mix-up)

Your mower has its own model number, and the engine has a separate model number. The manual for this mower lists a Briggs & Stratton engine model number 128602-0304-E1, which is not the mower model number.

Item	What it identifies	Example for this mower
Mower model number	The Craftsman mower and its parts diagrams	917.378980 (917378980)
Engine model number	The engine parts and engine service info	128602-0304-E1

Why it matters

Using the correct mower model number ensures you get the right Craftsman parts (like the blade, wheels, and drive components) and the correct diagrams for repairs and maintenance.

Helpful part examples for this model

If you are matching parts to the correct mower model, these are examples listed for model 917378980:

• Upper handle 584377101 (handle assembly component)
• Lawn mower ground drive belt 532189922 (self-propel drive belt)
• Lawn mower blade 532406713 (22-in deck mulching blade)

Last updated: February 2026

Craftsman model 917378980 is identified in the documentation as a Craftsman 7.0 HP, 22-inch multi-cut rotary lawn mower; the manual itself does not assign a specific manufacture year. For the most accurate date, we use the mower’s product ID/date code label on the deck or rear housing and decode it using the format shown in the 917378980 owner's manual.

How to find the date code on your mower

Look for a sticker or stamped tag on the mower (commonly on the rear of the deck, near the wheels, or around the engine mounting area). Then record the full code exactly as printed.

Common places to check:

• Rear of the cutting deck (near the discharge opening)
• Top of the deck under the handle mounting area
• Near the height adjuster brackets
• On the rear door/grass bag frame area
• Near the engine mounting bolts (do not confuse this with the engine model)

How the “year” is typically determined

Many Craftsman walk-behind mowers use a date code that can be read as month, day, year (for example, MMDDYY). Once you have that code, the last two digits indicate the year.

Quick example (format only)

Date code format	Example code	Interprets as	Year
MMDDYY	072811	July 28, 2011	2011

Don’t mix up mower model vs. engine model

Your mower model is 917378980. The engine can have its own separate model number (the manual lists a Briggs & Stratton engine model family), and that engine number does not reliably tell the mower’s build year.

Use this checklist:

• Use 917378980 for mower parts diagrams and chassis parts
• Use the engine model/type/code for engine-specific parts (carburetor, ignition, recoil)
• Use the mower date code label to determine the mower’s year

Why it matters

Getting the correct year helps match the right blade, drive parts, and handle hardware. For example, the correct 22-inch blade and drive system parts can vary by production run even when the model family looks similar.

Last updated: February 2026

On your Craftsman gas walk-behind mower, the model number is on the mower’s model and serial number label; for this unit it’s 917.378980. The fastest way to confirm the exact location and what the label looks like is to match it to the diagrams in the 917.378980 owner's manual.

Where to look on a walk-behind mower

Check these common label locations first (wipe off grass and dirt so you can read it clearly):

• On the rear of the mower deck near the discharge opening
• On top of the deck near the engine mounting area
• On the back flap area behind the engine (near the bagger opening)
• On the handle bracket area where the lower handle bolts to the deck
• Under the deck lip near the rear wheels (use a flashlight)

What the model number looks like

For this Craftsman mower, the model number is formatted with a decimal:

Item	Example for this mower	Why you need it
Mower model number	917.378980	Ensures you get the correct parts diagrams and replacements
Engine model number	128602-0304-E1	Used for engine-specific parts like carburetor and ignition items

Why it matters

We use the model number to match the correct parts list for your exact deck, drive system, and handle controls. That prevents ordering a blade, belt, or cable that looks similar but does not fit.

Tip if you’re ordering parts

Once you find the label, write the model number exactly as shown (including the decimal). If you’re replacing a wear item, also compare the part listing to your mower’s diagram in the manual.

Last updated: February 2026