Owner’s manual
View engine
How do I tell what year my Craftsman mower is?
For a Craftsman riding mower like model 917276921, the most reliable way to identify the year is to read the manufacturing date code in the serial number on the product ID tag. On many Craftsman tractors, the first six digits are MMDDYY (month, day, year).
Where to find the model and serial tag
On most Craftsman front-engine lawn tractors, we typically see the ID tag in one of these spots:
- Under the seat pan (lift the seat)
- On the rear fender pan near the seat
- On the frame rail near the engine compartment
- Near the transaxle area on the frame
For diagrams and the exact ID tag location for your tractor, use the 917276921 owner's manual.
How to decode the year from the serial number
Once you find the serial number, look for a six-digit date code at the beginning.
- First 2 digits: month (01 to 12)
- Next 2 digits: day (01 to 31)
- Last 2 digits: year (00 to 99)
Quick examples
| Date code | Interprets as | Build date |
|---|---|---|
| 071294 | 07 / 12 / 94 | July 12, 1994 |
| 032105 | 03 / 21 / 05 | March 21, 2005 |
| 110918 | 11 / 09 / 18 | November 9, 2018 |
If your serial number format looks different
Some Craftsman walk-behind mowers and a few tractor variations use a different pattern (letters mixed with numbers). When that happens, we use these checks to narrow it down:
- Confirm you are reading the serial number, not the engine model
- Look for a date code block separated by spaces or dashes
- Compare the tag format to the identification section in the 917276921 owner's manual
- Use the tractor model number (917276921) to match the correct parts diagrams
Why it matters
Knowing the build year helps us match the correct parts and specs for maintenance items like belts, blades, pulleys, and electrical switches. It also helps when you are troubleshooting issues tied to production changes.
Last updated: February 2026
How to look up Craftsman model number?
To look up your Craftsman model number for this tractor, we check the ID label on the machine and match it to the format shown in the 917276921 owner's manual. On most Craftsman riding tractors, the label is on the frame under the seat or on the underside of the seat.
Where to find the model and serial label
Look in these common spots first:
- On the frame directly under the seat (lift the seat to view)
- On the underside of the seat pan
- Near the rear fender area close to the seat mounting points
- On the frame rail near the engine compartment (less common)
What the number should look like
For Craftsman tractors, the model number is typically a 9-digit number (sometimes shown with a dot in printed materials). For this unit, the operator manual lists the model as 917.276921 (often written without the dot as 917276921).
| What you see on the label | What it means | Example |
|---|---|---|
| Model No. | Identifies the tractor family and configuration | 917276921 |
| Serial No. | Unique identifier for your exact tractor | Varies |
How we use the model number on Sears PartsDirect
Once you have the model number, we use it to pull the correct parts diagrams and ensure you get the right fit for items like belts, blades, pulleys, and electrical switches.
- Enter the full model number exactly as shown on the label
- Include all digits (do not shorten it)
- Use the serial number when a part changes by production run
- If the label is hard to read, clean it gently and take a clear photo before ordering
Why it matters
Craftsman tractors can look similar across multiple model series, but parts like deck components, steering hardware, and PTO controls can differ. Using the exact model number prevents ordering the wrong part and saves time during repair.
Last updated: February 2026
What are the parts of a riding lawn mower called?
On a Craftsman riding lawn mower like model 917276921, the “parts” are usually grouped into major systems: engine and fuel, electrical starting/ignition, drive and steering, mower deck and blade drive, and safety controls. Our 917276921 owner's manual uses these system names when describing operation, assembly, and service.
Common riding mower part names (by system)
- Engine and fuel: fuel tank, fuel line, fuel filter, carburetor, air filter, spark plug, muffler
- Electrical and starting: battery, fuse, ignition switch/key, solenoid, starter motor
- Drive and braking: drive belt, idler pulleys, transaxle, brake pedal, parking brake linkage
- Steering and front end: steering wheel, drag link, front axle, bearings/bushings
- Mower deck (cutting system): mower housing (deck), blades, mandrel (spindle) assemblies, deck belt, deck lift links, anti-sway bar
- Safety interlocks: seat switch, brake switch, PTO (blade engagement) switch
Parts you will see referenced during deck removal and service
The manual’s service steps commonly mention these deck-related parts and actions:
- Disengage the attachment clutch (PTO) before working
- Remove the mower belt from the electric clutch pulley
- Disconnect the front link, suspension arms, and rear lift links
- Release the spring-loaded belt tension rod carefully
If you are troubleshooting blade engagement, the switch.pto 582107601 is a common named part in the PTO safety and control circuit.
Quick glossary (what the names usually mean)
| Term you see | What it is | What it does |
|---|---|---|
| Mandrel (spindle) | Shaft and bearing assembly on the deck | Spins the blade |
| Electric clutch | PTO clutch on the engine crankshaft | Drives the deck belt |
| Idler pulley | Spring-loaded or fixed pulley | Maintains belt tension |
| Lift link/shaft | Deck lift hardware | Raises and lowers the deck |
Why it matters
Knowing the correct part names helps you match diagrams, follow service steps safely (key out, blades stopped, spark plug wire disconnected), and order the right replacement parts the first time.
Last updated: February 2026
What are the parts of a tractor engine?
A tractor engine is built from core internal parts that create compression and power (like the piston, cylinder, crankshaft, and valves) plus support systems that deliver fuel, spark, lubrication, cooling, and safe operation. For Craftsman model 917276921, our 917276921 owner's manual is the best reference for engine-related operation and maintenance.
Main tractor engine parts (what they do)
- Cylinder and cylinder head: form the combustion chamber
- Piston and piston rings: compress the air-fuel mixture and transfer force
- Connecting rod: links piston to crankshaft
- Crankshaft: converts up-and-down motion into rotation
- Camshaft, valves, and valve guides: control intake and exhaust flow
- Bearings: support rotating shafts and reduce friction
Engine support systems you will see on most lawn tractors
- Fuel system: fuel tank, fuel lines, fuel filter, carburetor
- Ignition system: ignition switch, safety interlocks, spark plug, wiring
- Lubrication system: oil sump, oil pump (varies by engine), oil drain
- Cooling and exhaust: air screen/fins, muffler, exhaust components
Quick reference table
| System | Common components | What a problem looks like |
|---|---|---|
| Fuel | tank, filter, carburetor | cranks but will not start, surging |
| Ignition | switch, plug, wiring | no spark, intermittent start |
| Cooling/exhaust | fins, screen, muffler | overheating, power loss |
| Lubrication | oil, drain tube | noisy running, rapid wear |
Why it matters
Knowing which system a part belongs to speeds up troubleshooting and helps you buy the right replacement. For example, many “won’t start” complaints trace back to fuel delivery, loose wiring, or dirty cooling fins rather than internal engine damage.
Related help
If the engine clicks or spins but will not start, use riding lawn mower engine spins but wont start video to narrow it down by symptom.
Last updated: February 2026
What model number is the Craftsman 42 riding mower?
For the Craftsman riding mower on this page, the model number is 917.276921 (often written without the dot as 917276921). Confirm the exact model by matching the number on your tractor’s ID tag to the model shown in the 917276921 owner's manual.
Where to find the model number on your mower
We recommend checking the tractor’s product ID label first, then matching it to the manual.
- Look under the seat pan area (common location on Craftsman tractors)
- Check the frame near the rear wheels or hitch plate
- Look near the engine compartment or dash support
- Match the full model number exactly, including any dots
- Use the manual’s cover page to confirm you have the right documentation
42-inch vs 54-inch deck: why the listing can look confusing
The manual excerpt for model 917.276921 references a 54-inch mower deck and a 26.0 HP garden tractor configuration. That means 917.276921 is not typically a “Craftsman 42-inch riding mower” model; it is a different size/class of tractor.
| What you’re trying to identify | What to check | What it tells you |
|---|---|---|
| “42-inch” mower size | Deck width sticker or blade/deck measurement | Cutting width (deck size) |
| Model number | ID tag on tractor frame | Exact parts lookup match |
| Manual match | Manual cover page | Confirms tractor family/specs |
Why it matters
Using the correct model number is the fastest way to get the right parts (belts, blades, mandrel assemblies, PTO switch, and steering components) and avoid ordering a deck or spindle part that will not fit.
Last updated: February 2026
