Owner’s manual
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Who makes Craftsman engines?
Craftsman lawn tractor engines are made by several engine manufacturers depending on the specific tractor and production run. For Craftsman model 917273639, the engine is part of an 18.5 HP, 42-inch-deck tractor platform; the exact engine maker is identified in the engine section and specifications in the owner's manual.
How to identify the engine maker on your 917273639
We recommend checking the engine ID plate and matching it to the manual information.
- Lift the hood and locate the engine model/type label (often on the blower housing or valve cover area).
- Write down the engine brand and engine model number.
- Compare that information to the engine pages in the owner's manual.
- If the label is dirty, wipe it gently so the stamped numbers are readable.
- Use the engine model number when ordering tune-up items (spark plug, air filter, oil filter).
Common engine makers you may see on Craftsman tractors
Across Craftsman riding mowers and lawn tractors, these are the most common engine brands used:
| Engine brand | What it typically indicates | Where to confirm |
|---|---|---|
| Briggs & Stratton | Very common on many Craftsman tractor models | Engine ID plate and owner's manual |
| Kohler | Common on mid to higher output tractor models | Engine ID plate and owner's manual |
| Kawasaki | Often used on select premium configurations | Engine ID plate and owner's manual |
Why it matters
The engine maker determines the correct maintenance parts and service specs, such as spark plug type, oil capacity, air filter style, and tune-up intervals. Using the engine model number prevents ordering the wrong parts even when the tractor model number is correct.
Last updated: February 2026
What engine does Craftsman riding mower use?
The Craftsman riding mower model 917273639 uses an 18.5 HP gas engine (a low-emission design) as specified in the owner's manual.
How to confirm the exact engine on your tractor
Even within the same tractor model, the engine family can vary by production run; the most reliable match is the engine ID label on the engine itself.
- Lift the hood and locate the engine data tag (often on the blower housing or valve cover area).
- Record the engine brand and the model-type-code (or model/spec) numbers.
- Match those numbers when ordering engine parts (air filter, spark plug, carburetor parts).
- Use the tractor model 917273639 when ordering chassis and deck parts (belts, blades, mandrels).
What we know for model 917273639 (from the manual)
The manual identifies this tractor as an 18.5 HP, 42-inch mower with electric start and a 6-speed transaxle.
| Item | What to expect on 917273639 | Why it matters |
|---|---|---|
| Horsepower rating | 18.5 HP | Helps confirm you are looking at the correct tractor family |
| Deck size | 42-inch | Determines blade and belt sizing |
| Starting system | Electric start | Points you toward battery, solenoid, and key-switch diagnostics |
| Drive type | 6-speed transaxle | Affects drive troubleshooting and parts selection |
Why it matters
Knowing the engine ID prevents ordering the wrong tune-up parts, while the tractor model number ensures you get the correct mower deck and steering components for your Craftsman chassis.
Related parts customers commonly replace
If you are working on mowing performance (cut quality, discharge, vibration), these model-matched deck parts are common wear items:
- Lawn tractor 42-in deck high-lift blade 532138971
- Husqvarna lawn tractor mulching blade, 21-in 532134149
- Craftsman lawn tractor blade drive belt, 5/8 x 97-2/5-in 532174883
- Husqvarna lawn tractor mandrel assembly 532130794
Last updated: February 2026
Where can I find the Craftsman riding mower model number?
On your Craftsman lawn tractor model 917273639, the model number is printed on the tractor’s model label and is also shown on the front page of the owner's manual. Check the frame area under the seat or near the rear fender, then match the number exactly when ordering parts.
Where to look on the tractor
Most Craftsman riding mowers and lawn tractors place the model label in one of these spots:
- Under the seat (lift the seat and look on the frame or seat pan)
- On the rear fender or rear frame area
- Along the left or right side of the tractor frame near the engine
- Near the footrest area on the frame rail
- On or near the transaxle area (rear drivetrain)
Tractor model number vs. engine model number
It’s common to see numbers stamped on the engine, but that is the engine identification, not the tractor model number. For parts lookups on this Craftsman tractor, use the tractor model number 917273639.
| What you’re identifying | Where you’ll find it | What it’s used for |
|---|---|---|
| Tractor model number (917273639) | Tractor frame label (often under seat) | Correct parts diagrams and parts list |
| Engine model/type code | Stamped/printed on engine shroud or metal | Engine-specific tune-up and engine parts |
| Transaxle model | Tag/marking on transaxle housing | Drivetrain and transmission parts |
Why it matters
Using the correct model number prevents ordering the wrong blade, belt, or deck parts. For example, this model’s 42-inch mower deck commonly uses blades like the husqvarna lawn tractor mulching blade, 21-in 532134149 or the lawn tractor 42-in deck high-lift blade 532138971 depending on your cutting setup.
Last updated: February 2026
What year did Craftsman make the 917273639?
Craftsman model 917.273639 was produced across multiple years; the most reliable way to pinpoint the exact build year for your specific tractor is to use the manufacturing date information on the tractor’s ID/serial label and confirm it against the model details in the owner's manual.
How to find the exact year on your tractor
On Craftsman 917-series lawn tractors, the build date is typically shown on the product identification label (often under the seat, on the rear fender pan area, or near the frame).
- Park on a flat surface, set the parking brake, and remove the key.
- Lift the seat and look for a white or silver ID/serial sticker.
- Write down the serial number and any date code printed on the label.
- If the label is dirty or faded, clean it gently and take a clear photo for reference.
- Match what you find to the identification information and diagrams in the owner's manual.
What “917.273639” tells you (and what it does not)
The model number 917.273639 identifies the tractor family and configuration (for example, this model is shown in the manual as an 18.5 HP, 42-inch mower, electric start, 6-speed transaxle unit). The model number alone does not uniquely identify a single calendar year because the same model can be sold over more than one season.
Common label fields to look for
| Label field | What it means | Why it helps |
|---|---|---|
| Serial number | Unique ID for your tractor | Often encodes production timing |
| Date code | Month/day/year or similar | Directly indicates build date |
| Engine model/type | Engine identification | Helps confirm correct tune-up parts |
Why it matters
Knowing the exact year helps us match the correct parts diagrams and hardware revisions, especially for wear items like blades, belts, and deck components. For example, if you are servicing the 42-inch deck, confirming the correct blade and mandrel style prevents fit issues.
If you are replacing cutting components, the parts list for this model includes items such as the lawn tractor 42-in deck high-lift blade 532138971 and the husqvarna lawn tractor mandrel assembly 532130794.
Last updated: February 2026
What model number is a Craftsman 6.75 lawn mower?
A “Craftsman 6.75” label by itself is not a model number; it usually refers to the engine horsepower class, not the mower’s identity. To get the correct model number for your specific Craftsman mower, we use the model tag on the mower (not the engine) and match it to the correct manual and parts list.
Where to find the model number on a Craftsman mower
On most Craftsman walk-behind mowers, the model number is on a sticker or metal tag on the mower deck (the body), not on the engine shroud.
Check these common locations:
- Rear of the deck near the discharge chute
- Top of the deck near the engine mounting area
- Behind the rear wheels on the deck housing
- Under the handle mounting area
- Near the height-adjuster bracket
What the model number looks like
Craftsman model numbers are typically a 9-digit number starting with 917 (example format: 917.XXXXXX or 917XXXXXX). Write it down exactly as shown, including any dots.
Quick ID table
| What you see | What it means | What to do next |
|---|---|---|
| “6.75” on the engine cover | Engine rating/class | Ignore for model ID; use the mower deck tag |
| 917.XXXXXX or 917XXXXXX | Mower model number | Use it to match parts and the correct manual |
| Engine brand/model (Briggs, etc.) | Engine identification | Useful for engine parts, not the mower chassis/deck |
Why it matters
The correct model number determines the exact blade, belt, and drive parts your mower uses. Two mowers with “6.75” engines can use different deck sizes, blade adapters, and self-propelled drive systems.
If you are actually working on a Craftsman tractor model 917273639
This page is for the Craftsman lawn tractor model 917273639 (18.5 HP, 42-inch deck). For that tractor, the model number is confirmed in the owner's manual.
Common 42-inch deck parts shown for model 917273639 include:
- Husqvarna lawn tractor mulching blade, 21-in 532134149 (listed as a 42-inch mulching blade in the tractor manual)
- Lawn tractor 42-in deck high-lift blade 532138971
- Vented mandrel shaft assembly 532137646
Last updated: February 2026
