Craftsman 917377170 gas walk-behind lawn mower Parts

For a Craftsman gas walk-behind mower model 917377170, it’s cheaper to repair when the problem is routine wear (blade, belt, wheel parts, tune-up items). Replacement makes more sense when the engine or drive system has major damage and repair costs approach about half the price of a comparable new mower.

Quick decision guide (repair vs replace)

We use these rules of thumb for walk-behind mowers:

• Repair when it needs normal maintenance (oil, spark plug, air filter) or common wear parts.
• Repair when the mower still starts reliably and the deck and crankshaft are straight.
• Replace when the engine has low compression, heavy smoke, or internal knocking.
• Replace when the self-propel drive has multiple worn components and the mower is already in poor overall condition.
• Replace when the deck is rusted through or cracked (structural damage).

Typical costs and what they usually mean

Actual pricing varies, but this comparison helps set expectations.

Issue type	Common examples	Usually best choice
Routine wear	Blade, belt, wheels, fasteners	Repair
Seasonal tune-up	Oil change, spark plug, air filter	Repair
Drive problems	Belt slipping, wheels not driving	Repair first, then reassess
Major mechanical	Bent crankshaft, internal engine failure	Replace

Model-specific tips that affect the decision

Your 917377170 manual calls out several maintenance items that keep repair costs low over time, including checking oil before each use and replacing the spark plug and air filter yearly. For blade service, it also specifies safe handling steps and a blade bolt torque range of 35 to 40 ft-lbs; following that prevents repeat failures and extra parts costs. Use the owner's manual for the full maintenance schedule and specifications.

Parts that commonly make repair the cheaper option

If the mower is otherwise in good shape, these common parts often restore performance for far less than replacement:

• Lawn mower blade 532406713 (cut quality and vibration issues)
• Belt 532157769 (self-propel slipping or no drive)
• Lawn mower wheel 582976701 (wobble, poor traction)
• Lawn mower blade adapter 581547901 (blade fit, vibration)

Why it matters

Repairing a mower that only needs maintenance parts protects the engine and drive system and keeps the mower cutting safely. Replacing a mower with major engine or structural damage avoids sinking money into a machine that will keep needing repairs.

Last updated: February 2026

For the Craftsman 917377170 gas walk-behind lawn mower, use unleaded regular gasoline (87 octane). Higher octane (89) does not improve performance in this mower and is unnecessary unless your fuel source only offers mid-grade; follow the fuel guidance in the owner's manual.

What the mower is designed to use

The product specifications for this model call for unleaded regular fuel.

• Use fresh, clean unleaded gasoline
• Use 87 octane (regular)
• Avoid overfilling; leave room for fuel expansion
• Let a hot engine cool before refueling
• Wipe up spilled gasoline before starting

When 89 octane makes sense (and when it does not)

89 octane is not harmful by itself, but it is not a fix for common small-engine issues.

Fuel choice	Use it when	What to expect
87 octane (regular)	Normal mowing and storage routines	Correct fuel for this mower
89 octane (mid-grade)	Regular is unavailable	No added power or reliability benefit

Why it matters

Using the correct fuel helps your mower start easier, run consistently, and reduces avoidable fuel-related problems that can feel like carburetor or ignition trouble.

If you are chasing a hard-start or rough-run symptom, focus on basics first (fresh fuel, correct oil level, clean air path) and use the fuel and safety steps in the owner's manual.

Last updated: February 2026

Common problems on the Craftsman 917377170 gas walk-behind lawn mower are no-start conditions (stale fuel, dirty air filter, disconnected spark plug wire, bad spark plug), rough running or stalling (fuel or airflow restriction), poor cut quality (worn or loose blade, uneven wheel height), and abnormal vibration (loose or damaged blade or blade adapter). See the owner's manual troubleshooting chart for the fastest model-specific checks.

Most common symptoms and what to check first

• Won’t start: stale fuel, water in fuel, dirty air filter, spark plug wire disconnected, bad spark plug, control bar released
• Starts then dies or runs rough: stale fuel, dirty air filter, carburetor restriction, over-priming (flooding)
• Hard to push or bogs down: cutting too much grass, deck packed with clippings, dirty air filter, walking speed too fast
• Poor cut or uneven cut: worn/bent/loose blade, uneven wheel height settings, low engine speed, debris under deck
• Vibrates abnormally: stop immediately; check for a loose blade bolt, damaged blade, or broken blade adapter

Quick troubleshooting steps (safe and effective)

1. Stop the engine and wait for all moving parts to stop.
2. Disconnect the spark plug wire before inspecting the blade or underside (the manual calls this out as a required safety step).
3. Confirm fresh fuel and correct priming; in cool weather you may need to prime again, but over-priming can flood the engine.
4. Check and clean or replace the air filter if it’s dirty.
5. Inspect the blade area for looseness or damage; a loose blade or broken adapter is a common no-start and vibration cause.

Parts that commonly solve these problems

Problem you notice	Common fix	Example part for this model
Poor cut, ragged grass	Replace a worn blade	Lawn mower blade 532406713
Vibration, blade won’t stay tight	Inspect/replace blade adapter	Lawn mower blade adapter 581547901
Self-propelled won’t move (if equipped)	Inspect/replace drive belt	Belt 532157769

Why it matters

Running with a loose blade, broken blade adapter, or abnormal vibration can quickly damage the mower and creates a serious safety risk. Catching fuel, airflow, and blade issues early also improves starting reliability and cut quality.

Last updated: February 2026

Craftsman model 917377170 is a model number, not a date code, so it does not directly tell you the year of manufacture. To identify the year, we use the mower’s product identification label information and match it to the model’s documentation in the owner's manual.

Where to find the date information

Look for the product identification label on the mower (commonly on the rear of the deck, near the handle mounts, or on the frame). Record these items:

• Model number: 917377170
• Serial number (or product number)
• Any date code printed on the label
• Engine model and type (helpful if the label is worn)

How to determine the year (practical method)

For Craftsman walk-behind mowers, the most reliable way is to use the identification label details and confirm the configuration against the illustrated parts information.

• Compare your mower’s handle, deck, and drive system to the diagrams and parts lists in the owner's manual
• If your mower is self-propelled, confirm drive components such as the belt and gearcase match what’s shown
• Use the serial number to narrow down the production run when ordering parts

Quick cross-check using common wear parts

If you are already replacing parts, matching the part callouts helps confirm you are working from the correct version of the model.

What you’re checking	What it helps confirm	Example part for this model
Blade size and mounting style	Deck and blade system version	Lawn mower blade 532406713
Self-propel drive behavior	Drive system version	Belt 532157769
Wheel and height adjust setup	Chassis configuration	Lawn mower wheel 582976701

Why it matters

The correct year and production run affect parts fitment (blade adapter style, drive belt routing, wheel hardware). Confirming the exact configuration prevents ordering a blade, belt, or gear part that looks right but mounts differently.

Last updated: February 2026