Craftsman 917377651 gas walk-behind lawn mower Parts

Common problems on the Craftsman gas walk-behind lawn mower model 917377651 are hard starting, poor or uneven cutting, excessive vibration, and a starter rope that is hard to pull. These issues usually come from stale fuel, restricted airflow, grass buildup under the deck, or blade system damage after an impact.

Most common symptoms and likely causes

• Won’t start or starts then dies: old gas, carburetor varnish, fouled spark plug, dirty air filter
• Poor or uneven cut: worn or bent blade, wheels set at different heights, debris under the deck
• Excessive vibration: loose blade hardware, bent blade, impact damage (possible bent crankshaft)
• Starter rope hard to pull: control bar not held to the handle, blade dragging in grass, broken blade adapter
• Self-propelled won’t move (if equipped): worn drive belt, idler/pulley wear

Quick checks we recommend first

• Hold the control bar against the upper handle before pulling the starter rope
• Drain old fuel and refill with fresh gasoline
• Clean or replace the air filter
• Clean the underside of the mower housing (deck)
• Inspect the blade and blade adapter after striking an object

Manual-based troubleshooting (917377651)

Use the troubleshooting chart in the 917377651 owner’s manual to match symptoms to corrections.

Problem	Common cause	Fix
Poor cut	Blade worn/bent/loose; wheels uneven; deck packed with grass	Replace/tighten blade; set wheels same height; clean underside
Excessive vibration	Blade damage; crankshaft damage	Replace blade; have crankshaft serviced
Rope hard to pull	Brake engaged; blade adapter broken; blade dragging	Hold control bar; replace adapter; move to hard surface

Parts that often get replaced

When blade mounting hardware is damaged or missing, match the fastener exactly; one example is the lock nut 532409149.

Why it matters

Poor cutting and vibration are early warnings of blade or deck problems. Fixing them quickly improves cut quality and helps prevent accelerated wear on the crankshaft, pulleys, and fasteners.

Last updated: February 2026

For the Craftsman gas walk-behind mower model 917377651, use SAE 30 engine oil for temperatures above 32°F, and use SAE 5W-30 for temperatures below 32°F. The oil capacity is 20 ounces; we add about 15 ounces first, then top off to the full mark on the dipstick.

Oil type and capacity for model 917377651

Use high-quality detergent oil with an API service rating SF-SJ.

• Oil type (above 32°F): SAE 30
• Oil type (below 32°F): SAE 5W-30
• Oil capacity: 20 oz
• First fill guidance: pour about 3/4 of the included bottle (about 15 oz.), then recheck and add small amounts

For the exact fill and checking procedure, follow the steps in the 917377651 owner's manual.

Quick temperature guide

Outdoor temperature	Recommended oil	What to watch for
Above 32°F	SAE 30	Best for warm-weather mowing
Below 32°F	SAE 5W-30	Easier starting in cold weather

How we recommend filling and checking oil

• Park the mower on a level surface.
• Clean around the oil fill/dipstick so debris does not fall into the engine.
• Add about 15 oz., wait a minute, then check the dipstick.
• Add oil in small amounts until it reaches the full line.
• Tighten the dipstick securely before starting.
• Check oil before each use; change oil every 25 hours or each season.

Why it matters

Using the correct SAE viscosity and keeping the level at the dipstick’s full mark prevents hard starting, smoking from overfilling, and accelerated engine wear. It also helps your Craftsman mower maintain consistent power under load.

Last updated: February 2026

The model number is 917.377651; it’s printed on the Craftsman rotary lawn mower’s identification label and shown on the cover page of the 917377651 owner's manual. This model is a 21-inch, power-propelled rotary mower.

Where to find the model number on the mower

We recommend matching the number on the mower to the number in the manual to avoid ordering the wrong parts.

• Check the model label on the mower deck (typically near the rear or side of the deck)
• Look for a format like 917.377651 (sometimes shown with a dot)
• Record the full number before shopping for parts like belts, pulleys, or wheels
• Use the model number when referencing diagrams and key numbers in the parts list

Model number formats you may see

The same model can appear with or without punctuation.

How it may appear	What it means
917.377651	Standard printed format in the manual and on labels
917377651	Same model number without the dot

Why it matters

Parts and diagrams are model-specific. Using 917.377651 helps ensure you get the correct drive components (like a ground drive belt or idler pulley), handle hardware, and deck-related parts for your Craftsman gas walk-behind mower.

Last updated: February 2026

Craftsman model 917.377651 was sold across multiple seasons; the exact production year is determined by the serial or date code on the mower’s ID label, not by the model number alone. Use the identification details and specs in the Craftsman 917.377651 owner's manual to match your mower correctly.

How to find the build year on the mower

On Craftsman walk-behind mowers, the build date is tied to the product label information.

• Look for the ID label on the mower deck, rear housing, or near the engine mounting area
• Write down the full model number 917.377651 and the serial or date code exactly
• Compare the label format and identification notes in the manual
• Clean the label area so every character is readable before recording it
• Keep the numbers with your maintenance records for future parts lookups

What the manual tells you about this model

The manual identifies 917.377651 as a Craftsman rotary lawn mower with a 21-inch cutting deck and power-propelled design; those details help confirm you have the right diagrams and parts list.

Identifier	Good for	Not enough for
Model number 917.377651	Matching the correct manual and parts diagrams	Pinpointing the exact year
Serial or date code	Determining the production year or range	Ordering parts without confirming the model

Why it matters

Knowing the correct build year helps you avoid ordering the wrong drive components or hardware when there were running changes. For example, the correct belt and fasteners can vary; confirm against the diagrams before replacing items like the lawn mower ground drive belt 532166060.

Last updated: February 2026