Craftsman 917273402 lawn tractor Parts

For the Craftsman lawn tractor model 917273402, use a high-quality detergent 4-cycle engine oil that meets API service classification SF through SJ, and choose the SAE viscosity based on the temperatures you mow in (the owner's manual includes the viscosity chart). Check the oil level before each use and keep it at the FULL mark.

Recommended oil type and viscosity

We match oil viscosity to outdoor temperature because it affects starting, lubrication, and oil consumption.

• Use detergent engine oil rated API SF-SJ
• Pick the SAE viscosity grade for your expected operating temperature (see the chart in the manual)
• Multi-viscosity oils such as 5W30 or 10W30 help cold starts
• When temperatures are above 32°F, multi-viscosity oils can increase oil consumption; check the level more often
• Do not mix oil with gasoline (this is a 4-cycle engine)

Oil level checks and change interval

Keeping the crankcase full is the fastest way to prevent engine wear.

• Check oil with the tractor on level ground
• Wipe the dipstick, reinstall and tighten, then recheck for an accurate reading
• Keep oil at the FULL line; do not overfill
• Check oil before starting and after each 8 hours of operation
• Change engine oil every 50 hours or at least once a year (whichever comes first)

Quick maintenance schedule

Task	Interval
Check engine oil level	Before starting; then every 8 hours
Change engine oil	Every 50 hours or yearly
Replace oil filter	Every season (or every other oil change if used over 100 hours/year)

Why it matters

Using the correct API-rated oil and the right viscosity for the season helps your 917273402 start easier, run cooler, and avoid damage from running low on oil, especially in warmer weather when consumption can increase.

Last updated: February 2026

The Craftsman lawn tractor model 917273402 is an 18.0 HP riding mower with a 42-inch mower deck and electric start; the exact engine manufacturer (such as Briggs & Stratton or Kohler) is identified on the engine label and in the specifications section of the owner's manual.

How to identify the exact engine on model 917273402

Use these quick checks to confirm the engine make and model on your tractor:

• Look for the engine ID label on the blower housing, valve cover, or near the starter
• Record the engine model, type, and code (or spec number)
• Match those numbers to the Product specifications section in the manual
• If the label is dirty, wipe it clean; avoid spraying water directly into electrical connectors
• Compare what you find to the parts diagrams when ordering tune-up or starting parts

Common engine-related parts you may replace

Even without changing the whole engine, these parts often solve starting and performance issues:

Symptom	Most common cause	What to check first
Clicks but will not crank	Weak battery, bad solenoid, poor cable connection	Battery charge, terminals, solenoid output
Cranks but will not start	Fuel or ignition issue	Fresh fuel, spark plug wire connection
Rough running or loss of power	Airflow restriction or maintenance overdue	Air filter, cooling fins, muffler condition

If you are troubleshooting a no-crank click, the solenoid with brass plunger 532146154 is a common electrical wear item on riding tractors.

Why it matters

The engine brand and exact engine model determine the correct tune-up parts, oil type, and some starting-system components. Confirming the engine ID first helps prevent ordering the wrong parts and speeds up repairs.

Last updated: February 2026

On the Craftsman 917273402 front-engine lawn tractor, the engine system is built around fuel delivery, air intake, ignition, and internal rotating parts that create power; the tractor also uses safety controls and operator controls (like the ignition switch and clutch/brake pedal) to start and run the engine safely. For diagrams and model-specific locations, use the owner's manual.

Main engine components (what they do)

Most lawn tractor engines use these core parts:

• Fuel tank and fuel line: stores and delivers gasoline to the engine
• Fuel filter: traps debris before it reaches the carburetor
• Carburetor: mixes fuel and air for combustion
• Air filter and air intake: keeps dirt out of the engine
• Ignition system: spark plug, ignition coil, and wiring that create spark
• Flywheel: helps smooth engine rotation and supports ignition timing
• Crankcase and crankshaft: houses oil and converts combustion into rotation
• Starter system: cranks the engine (electric starter and solenoid on many tractors)

Tractor controls that affect starting and running

Your 917273402 also relies on controls and interlocks that must be set correctly to start and keep running:

• Ignition switch: starts and stops the engine
• Clutch/brake pedal: used for braking and is commonly required for starting
• Throttle/choke control: helps with cold starts and sets engine speed
• Operator-safety presence system: shuts the engine down if you leave the seat in unsafe conditions

Quick troubleshooting map (symptom to likely area)

Symptom	Most likely engine-related area to check	Common next step
Loss of power	Fuel, spark, airflow	Check fuel quality, spark plug, and air filter
Excessive vibration	Blade/mandrel (not internal engine)	Inspect blades and mandrel for damage
Engine runs but blades will not rotate	Deck drive belt/idlers/mandrels	Check for obstructions and belt condition
Engine keeps running when you leave the seat	Safety interlock system	Test seat switch and related wiring

Why it matters

Knowing which parts belong to the engine (fuel, air, ignition, crankcase) versus the deck drive (blades, mandrels, belts) helps you diagnose problems faster and order the right replacement parts the first time.

Last updated: February 2026

The model number for this Craftsman riding mower is 917.273402 (often written without the dot as 917273402). You can confirm it on the identification label and in the first pages of the owner's manual.

Where to find the model number on the tractor

Look for the model label in one of these common spots:

• Under the seat (seat pan area)
• On the frame near the rear wheels
• Under the hood near the engine compartment
• Near the footrest area on the frame rail

Why you might see it written two different ways

Both formats refer to the same Craftsman lawn tractor model.

Format you see	What it means	Use it for
917.273402	Manual and decal lists often show the dot	Verifying against documentation
917273402	Online parts lookup commonly drops punctuation	Searching parts diagrams and parts lists

Why it matters

Using the exact model number ensures you get the right parts and diagrams for your 42-inch mower deck and related systems (blades, mandrel assemblies, steering, and electrical components). For example, the manual for model 917.273402 lists compatible 42-inch deck blades such as the lawn tractor 42-in deck high-lift blade 532138971.

Last updated: February 2026