Craftsman 917388520 gas walk-behind lawn mower Parts

For the Craftsman 917388520 gas walk-behind lawn mower, use fresh regular unleaded gasoline (most owners use E10, up to 10% ethanol). Avoid old or contaminated fuel; stale gas is a common reason these mowers will not start. See the 917388520 owner's manual for fuel and safety details.

What to use (and what to avoid)

• Use fresh, clean regular unleaded from a busy station
• E10 is typically fine for walk-behind mower engines
• Avoid stale fuel (left in the can or tank for weeks or months)
• Avoid fuel contaminated with water, dirt, or rust
• Avoid storing gasoline from one season to the next

Quick fuel checklist before you mow

1. Fill the tank with fresh regular unleaded.
2. If the mower has been sitting, drain old fuel and refill.
3. Use a clean gas can; replace it if it starts to rust.
4. Wipe up spills and keep fuel off finished surfaces and wheels.

Fuel storage and off-season tips

The manual calls out that you should not store gasoline from one season to another and that rust or dirt in gasoline causes problems.

Situation	What we recommend	Result
Mower used weekly	Buy small amounts of fuel often	Easier starting, fewer carb issues
Mower stored for weeks/months	Drain old fuel and refill with fresh	Reduces “stale fuel” no-starts
Gas can shows rust or debris	Replace the can	Prevents dirt/rust in fuel

Why it matters

Fuel quality directly affects starting and running. The troubleshooting section lists stale fuel and water in fuel as common causes of a mower that does not start, so using fresh regular unleaded is one of the most effective ways to prevent no-start problems.

Last updated: January 2026

The model number for this Craftsman gas walk-behind lawn mower is 917.388520 (often written without the dot as 917388520). You’ll find the model and serial number on a decal on the rear of the mower housing; confirm it against the 917388520 owner's manual.

Where to find the model number on the mower

Look for the identification decal in these common spots:

• Rear of the lawn mower housing (most common on this model)
• Near the rear discharge opening
• On the deck close to the height adjuster area
• On the handle bracket area (less common)

How to read the number correctly

Craftsman model numbers are sometimes printed with a dot.

Printed format	Same model written as	What it means
917.388520	917388520	Same mower model number
917.388520 + serial	917388520 + serial	Serial identifies your exact unit

Why it matters

Using the exact model number 917388520 ensures you get the right Craftsman parts and diagrams for maintenance and repairs (blade adapter, wheels, grass bag, handle hardware). It also helps match the correct engine and specifications listed in the manual.

Related parts customers often match by model

If you’re ordering common wear items, match them to model 917388520 first:

• Lawn mower blade adapter 532418373
• Wheel 583103101
• Lawn mower grass bag 532410666

Last updated: January 2026

A Craftsman gas walk-behind lawn mower like model 917388520 typically lasts 8 to 12 years with normal residential use and routine maintenance. Consistent oil checks, blade care, and keeping fasteners tight are the biggest factors in reaching the high end of that range.

What affects lifespan the most

• Engine oil habits: check oil before starting and during extended use; low oil shortens engine life.
• Blade condition: a sharp, straight blade reduces vibration and stress on the crankshaft.
• Lubrication points: keep wheel adjusters and pivots lubricated as outlined in the 917388520 owner's manual.
• Storage and fuel practices: clean, dry storage and fresh fuel reduce corrosion and starting issues.
• Impact damage: hitting stumps, rocks, or deep ruts can bend the blade and damage the deck or wheels.

Maintenance schedule we recommend (simple and effective)

Use this as a practical baseline; follow the manual for exact intervals and procedures.

Task	Quick frequency	Why it helps
Check engine oil level	Before each mow	Prevents engine damage from low oil
Inspect blade for bends/damage	Every 5 to 10 hours	Reduces vibration and wear
Tighten loose fasteners	Monthly during season	Prevents parts wear and deck damage
Clean underside of deck	After mowing wet or heavy grass	Improves cut quality, reduces rust

Parts that commonly wear over time

If handling, safety, or cut quality starts to decline, these are common wear items to inspect on this model.

• Lawn mower zone control cable 532162778 (operator presence control cable)
• Lawn mower blade adapter 532418373 (connects blade to the engine shaft)
• Wheel 583103101 (worn tread or wobble can affect cut height)
• Lawn mower grass bag 532410666 (fabric and frame wear with normal use)

Why it matters

A mower that is maintained to spec runs cooler, vibrates less, and puts less load on the engine and drive components. That directly translates to longer service life and fewer mid-season breakdowns.

Last updated: March 2026