Craftsman 917254640 38" 12-hp riding lawn tractor Parts

The model number for this Craftsman riding mower is 917254640. In the owner's manual, it’s listed as a 12 H.P., 38-inch riding lawn tractor (model number 917.254640, which matches 917254640 without the dot).

Where to find the model number on the mower

We recommend confirming the number on the mower’s ID label before ordering parts.

• Check under the seat pan or seat bracket area
• Look on the frame near the rear wheels
• Check the dash tower or steering column support
• Wipe the label clean; grass and oil can hide digits
• Match the full model number exactly (all digits)

Model number formats you may see

The same mower can show the model number with or without punctuation.

Label format	What it means	Use for parts lookup
917254640	Standard model number	Yes
917.254640	Same model with a dot	Yes

Why it matters

Parts for Craftsman riding mowers can look similar across 917-series tractors, but belts, blades, and safety switches vary by deck size and build. Using 917254640 helps ensure you get the correct fit for your 38-inch deck and 12 HP configuration.

Last updated: February 2026

For the Craftsman riding lawn tractor model 917254640, the engine manufacturer depends on the specific engine installed on the tractor. The parts list in our owner's manual identifies this model as using a Tecumseh engine (engine model 143.396012), so Tecumseh is the engine maker for this configuration.

How to confirm the engine maker on your tractor

Even within the same Craftsman model family, engines can vary by production run or prior replacement. We recommend confirming using the engine ID tag on the engine itself.

• Look for the engine model and spec numbers on the blower housing or valve cover area
• Match the engine model to the engine parts listing in the manual
• Use the tractor model number 917254640 when looking up chassis and deck parts
• If the engine was replaced, use the engine model/spec for engine parts (gaskets, carb parts, ignition)
• Keep the engine ID numbers handy before ordering tune-up or exhaust parts

What the manual shows for model 917254640

The manual’s repair parts section lists the engine as Tecumseh and provides the engine model number.

Item	What to look for	What it tells you
Tractor model	917254640	Which chassis/deck/drive parts fit
Engine listing in manual	Tecumseh	Engine manufacturer for the documented configuration
Engine model number	143.396012	Which engine parts diagram applies

Why it matters

Engine maker affects parts fitment and service specs. For example, an exhaust gasket, starter components, and carburetor parts must match the exact engine model, while belts, blades, and steering parts must match the tractor model.

If you are troubleshooting a no-start, a common electrical wear item is the starter solenoid; see solenoid 532146154.

Last updated: February 2026

Craftsman model 917254640 is a model number, not a date code, so it does not identify a single “year” by itself. To find the year your specific tractor was built, use the product identification label information and the date or serial data shown in the 917254640 owner's manual.

Where to find the build year on the tractor

On most Craftsman front-engine riding mowers, the model and serial information is printed on a label attached to the tractor frame.

• Look under the seat pan area or on the rear fender deck near the seat
• Check the frame rail near the engine compartment
• Wipe the label clean so the serial/date characters are readable
• Write down the full model and the full serial/date information exactly as shown

How to interpret what you find

Different production runs use different formats, so the most reliable approach is to match your label format to the identification section in the manual.

What you have	What it tells you	What to do next
Model number (917254640)	Identifies the tractor family and parts list	Use it to look up diagrams and parts
Serial number/date code	Identifies your unit’s production timing	Use the manual’s ID guidance to decode
Engine model (example: Tecumseh 143.396012)	Identifies the engine version used on this tractor	Use it for engine-specific tune-up parts

Why it matters

The build year (or production range) helps ensure you get the correct replacement parts for wear items like the ground drive belt, mower deck belt, idler pulleys, and safety switches, since designs can change across runs even within the same model family.

Parts that commonly depend on the exact version

Once you confirm your tractor’s identification details, these are common match-sensitive parts for the 917254640 platform:

• Ground drive belt: v-belt 532125907
• Mower deck belt: lawn tractor blade drive belt 532106085
• Starter circuit component: solenoid 532146154
• Operator presence safety: lawn tractor seat switch 532421062

Last updated: February 2026

Craftsman riding mower model 917254640 uses a Tecumseh engine; the engine parts list for this tractor identifies engine model 143.396012. Use the engine ID tag on your mower to match the exact engine model and spec numbers before ordering tune-up or repair parts; see the owner's manual.

How to identify the engine on your 917254640

Use these checks so the parts you buy match your exact engine build:

• Find the engine ID tag (commonly on the blower housing, near the starter, or on the valve cover area)
• Write down the full engine model number and any spec/type code shown on the tag
• Compare your tag information to the engine listing in the owner's manual
• Match visible components (air cleaner, carburetor, starter) to the illustrated engine parts pages

What the manual lists for this tractor

The repair parts section for model 917254640 lists the engine as Tecumseh model 143.396012.

Item	For model 917254640	Why it matters
Tractor model	917254640	Ensures chassis and deck parts fit
Engine make	Tecumseh	Narrows engine parts family
Engine model	143.396012	Matches internal engine parts and tune-up items

Why it matters

Horsepower and deck size do not identify the engine. The engine model and spec code determine the correct carburetor parts, gaskets, starter components, and ignition parts, which prevents ordering the wrong items.

Last updated: February 2026

Yes; replacing the engine on your Craftsman 917254640 38-inch 12-hp riding lawn tractor is worth it when the deck, steering, and drive system are solid and the total repair cost stays well below the price of a comparable replacement tractor.

Quick decision checklist

• Deck is not rusted through, cracked, or badly bent
• Tractor drives normally (no slipping, grinding, or loss of motion)
• Safety interlocks work (seat switch, brake/clutch switch, PTO switch)
• Common wear parts are still available (belts, blades, pulleys, solenoid)
• You want to keep the same 38-inch deck setup

Cost and condition guide

Tractor condition	What it means	Best move
Strong deck and drivetrain; engine is the main issue	Good swap candidate	Replace engine
Multiple major problems (deck damage, drive issues, heavy vibration)	Costs stack fast	Replace tractor
Only starting or intermittent running problems	Often fuel, ignition, or interlock related	Diagnose first

Diagnose before you commit

Many “dead engine” complaints are tune-up, fuel, or safety-interlock issues. Use the owner's manual to follow troubleshooting and maintenance intervals.

Start with these high-impact checks:

• Spark plug: replace every 100 hours/season; gap to 0.030 inch
• Fuel delivery: replace a clogged in-line fuel filter if flow is restricted
• Carburetor: adjust mixture and idle as directed; do not adjust the factory high-speed stop
• Safety interlocks: test the seat switch; replace if faulty (see lawn tractor seat switch 532421062)

Why it matters

An engine swap only pays off if the rest of the tractor is dependable. Worn belts, binding idlers, or a deck problem can still cause bogging, poor cut quality, and vibration even with a new engine.

Last updated: February 2026