Craftsman 917377842 gas walk-behind lawn mower Parts

Common problems on the Craftsman gas walk-behind mower model 917377842 include loss of power, poor or uneven cutting, excessive vibration, a starter rope that’s hard to pull, grass catcher performance issues (if equipped), and self-propel/drive complaints such as hard to push or loss of drive. The 917377842 owner's manual troubleshooting section lists these symptoms and the most common causes.

Most common symptoms and likely causes

• Loss of power: dirty air filter, cutting too much grass, grass and debris buildup under the deck, too much oil in the engine
• Poor or uneven cut: worn, bent, or loose blade; uneven wheel height; deck buildup
• Excessive vibration: worn/bent/loose blade, broken blade adapter, bent crankshaft after an impact
• Starter rope hard to pull: blade dragging in grass, brake not releasing, impact-related damage
• Hard to push or loss of drive: rear drive wheels not moving freely due to grass and debris packed in the wheel and dust cover area
• Grass catcher not filling (if equipped): cutting height too low, blade lift worn, or airflow restricted by deck buildup

Quick checks we recommend (safe, high-impact)

• Shut off the engine, let it cool, and disconnect the spark plug wire before working near the blade.
• Check and service the air filter; restricted airflow is a top cause of power loss.
• Clean packed grass and leaves from under the mower deck to reduce drag and improve airflow.
• Verify wheel height settings are even side-to-side to correct uneven cutting.
• Inspect the blade and blade mounting hardware for looseness or damage.
• If vibration persists after blade inspection, check the blade mounting components; the blade adapter 532186766 is a common wear item in the blade stack.

Symptom-to-first-step guide

Symptom	Most common cause	Best first step
Loss of power	Dirty air filter, deck buildup	Service filter; clean deck
Uneven cut	Blade condition, wheel height	Sharpen/replace blade; level height
Vibration	Blade/adapter damage	Inspect blade; inspect adapter
Hard to push	Debris in drive wheels	Clean drive wheel and dust cover area

Why it matters

Most mower problems trace back to airflow restriction, deck drag, or impact damage. Fixing the basics improves cut quality, reduces engine strain, and helps prevent bigger failures like crankshaft damage.

Last updated: February 2026

The model number for this Craftsman gas walk-behind lawn mower is 917.377842 (often written without the dot as 917377842). You can confirm it on the model tag and in the 917377842 owner's manual.

Where to find the model number on the mower

We use the model number to match the correct Craftsman parts diagrams and replacement parts.

• Check the model tag/label on the mower deck or rear housing area
• Look for a line that says “Model No.”
• Write it exactly as shown (including dots or dashes if present)
• Use the full model number when ordering parts like wheels, cables, or a transmission

Model number formats you may see

The same mower can show the model number in slightly different formats.

How it may appear	What it means
917.377842	Standard manual/label format
917377842	Same model number without punctuation

Why it matters

Using 917377842 ensures you get parts that fit your exact Craftsman walk-behind mower, especially for drive system components and controls.

If you are troubleshooting drive issues, the parts list for this model includes items like the lawn mower transmission assembly 532188294 and related drive control hardware.

Last updated: February 2026

The Craftsman gas walk-behind mower model 917.377842 uses a 21-inch cutting deck (often listed as a 21 inch “Multi-Cut” deck). For the exact cutting-width and setup details for your mower, use the 917377842 owner's manual.

Quick specs for this model

• Cutting deck (cutting width): 21 inches
• Mower type: rotary lawn mower
• Power: 6.5 horsepower (as listed in the manual)
• Drive: power-propelled

Item	What it means	What to measure/check
Deck size (cutting width)	Width of grass cut in one pass	Blade cutting path, not the full deck shell
Deck shell width	Physical deck housing width	Usually wider than the cutting width
Bagging/mulching setup	Affects airflow and clipping handling	Confirm chute/deflector is installed correctly

How to confirm the deck size on your mower

• Look for the 21 inch marking on the deck or in the model/feature labeling.
• Measure the blade length tip-to-tip; most 21-inch mowers use a blade close to 21 inches.
• Measure the cutting path (the circle the blade makes), not the outside edge of the deck.
• Verify the model tag shows 917.377842 so you are matching the correct Craftsman mower.

Why it matters

Deck size determines the correct blade length, mulching/bagging performance, and which deck-related parts fit. Ordering parts by the wrong deck size can lead to poor cut quality and unsafe vibration.

Last updated: February 2026

Craftsman model 917.377842 is a specific walk-behind mower model number, not a date code; the model number itself does not tell you the year it was built. To find the year, we use the product ID/serial information and the date-code guidance shown in the 917377842 owner's manual.

How to find the year on your mower

We recommend checking these common locations for the serial/date information:

• On the rear of the mower deck (near the discharge opening)
• On the underside of the deck (tip the mower safely and only after disconnecting the spark plug wire)
• Near the engine mounting area on the deck
• On a product label near the handle brackets
• On paperwork that came with the mower (receipt, registration)

Understanding what you are looking at

Many Craftsman walk-behind mowers have multiple identifiers. Here is how they typically differ:

What you see	Example format	What it tells you
Model number	917.377842	Identifies the mower design and parts list
Serial number / product ID	Varies by label	Used to determine build date and production run
Engine model/type/code	Varies by engine brand	Often includes an engine build date (engine only)

Quick checks that prevent wrong-year assumptions

Use these checks before relying on a “month-day-year” interpretation from a video or forum:

• Confirm you are reading a date code on a label, not the model number.
• If the label has 6 digits, it may be a date code; if it has 9 digits like 917377842, it is the model.
• If your mower is self-propelled and the drive system parts match the diagrams, that confirms the model family, not the year.
• If you are servicing the drive system, match parts by diagram and description (for example, the lawn mower drive control lever 532425662 is a drive-control component, not a date identifier).

Why it matters

Getting the year right helps you buy the correct Craftsman parts (drive control, gear case, wheels, chute, and fasteners) and avoid ordering look-alike components that do not fit your exact production run.

Last updated: February 2026

On your Craftsman walk-behind mower, the model number is on the mower’s ID label (not the engine). For this unit, the model is 917.377842 (often shown as 917377842). Use that number when ordering non-engine parts.

Where to look on model 917377842

Check these common label locations first:

• Rear of the mower deck, near the discharge opening
• Top of the deck behind the engine (near the recoil starter area)
• Near the rear wheels or height-adjuster area
• On the handle support brackets near the deck
• Under the grass bag area (rear door region)

If the label is dirty or faded, wipe the deck clean and use a flashlight at a low angle to make the print easier to see.

Model number vs. engine numbers (why it matters)

Many Craftsman mowers have a separate engine model and type code on the engine shroud. That engine number is used for engine-specific items (like carburetor or ignition parts), but the mower model number is what matches the chassis, drive system, wheels, handle, and bagging parts.

You need parts for	Use this identifier	Example on this mower
Mower deck, drive, wheels, handle, bagging	Mower model number	917377842
Engine-only components	Engine model/type code	Found on engine shroud

Quick tip for confirming you have the right mower model

In the parts diagrams and lists, you will see the mower identified as Craftsman ROTARY LAWN MOWER, model number 917.377842. You can also confirm by matching a known chassis part from the diagrams, such as the lawn mower transmission assembly 532188294.

Use the manual to find the label and parts breakdown

Our 917377842 owner's manual shows the mower identification and includes exploded-view parts diagrams that help you match the correct section (handle, drive control, gear case, rear skirt, and more).

Last updated: February 2026