Owner’s manual
View engine
What model number is the CRAFTSMAN 42 riding mower?
For the Craftsman front-engine lawn tractor on this page, the model number is 917.270770 (often written as 917270770). Our 917270770 owner's manual also identifies it as a 42-inch mower deck lawn tractor.
Where to find the model number on the tractor
We recommend confirming the model number directly on the unit before ordering parts.
- Check the model tag under the seat or on the seat pan
- Look on the frame near the rear wheels
- Check the engine area or hood support for an ID label
- Match the tag to the format 917.XXXXXX (Craftsman tractor style)
- Use the manual’s cover page to confirm you have the right book for your tractor
Model number vs. deck size (quick check)
A “42-inch” description tells you the cutting deck width, not the full model number. Multiple Craftsman tractors can be 42-inch, so the model number is what ensures correct belts, blades, and deck parts.
| What you have | Example | What it’s used for |
|---|---|---|
| Model number | 917.270770 | Correct parts lookup and diagrams |
| Deck size | 42-inch mower deck | Blade and deck compatibility checks |
| Engine model (separate ID) | Briggs & Stratton 42E707 | Engine-specific parts and tune-up items |
Why it matters
Using the exact model number 917.270770 helps us match the correct mower deck assembly, drive system, and hardware. For example, deck-related parts for this model include the husqvarna lawn tractor mulching blade, 21-in 532134149 and the lawn tractor drive belt 532144200, which must match the deck and routing used on your tractor.
Last updated: February 2026
What are the parts of a lawn mower engine?
On the Craftsman lawn tractor model 917270770, the engine is made up of air, fuel, ignition, lubrication, cooling, and starting systems that work together to create power and keep the engine running smoothly. For your exact engine layout and service points, use the 917270770 owner's manual.
Main engine systems (what you will typically find)
- Air intake: air filter, intake tube, carburetor/throttle body
- Fuel system: fuel tank, fuel line, fuel filter, carburetor, choke
- Ignition system: spark plug, ignition coil, kill wire, ignition switch circuit
- Starting/charging: starter motor, starter solenoid, battery, charging circuit
- Lubrication: oil fill, dipstick, crankcase, oil drain
- Exhaust: muffler, exhaust pipe, heat shield
Controls you use that affect the engine
Your manual calls out key operator controls that directly impact engine operation:
- Throttle control: run at full throttle for best mowing and battery charging
- Choke control: use for cold starts, then push in as the engine warms
- Ignition switch: turn fully to OFF when parked to prevent battery drain
Quick symptom-to-system guide
| Symptom | Most likely engine system to check first |
|---|---|
| Engine clicks but will not start | Starting circuit (battery, solenoid, starter, wiring) |
| Loss of power | Air intake, fuel delivery, ignition, muffler restriction |
| Excessive vibration | Blade/mandrel area (often feels like engine vibration) |
| Backfire when shutting off | Throttle setting and ignition shutdown |
Why it matters
Knowing which system a part belongs to helps you troubleshoot faster and buy the right replacement. For example, a “click” at the key usually points to the starting circuit (wiring, solenoid, starter) rather than fuel or spark.
Last updated: February 2026
What year did Craftsman make the 917270770?
The Craftsman lawn tractor model 917270770 does not have a single “model year” printed in the parts manual; the reliable way to identify the build timeframe is to use the tractor’s serial number and any engine date code. Use the 917270770 owner's manual to confirm you are matching the correct model and assemblies.
How to find the build timeframe on your exact tractor
Use the identification tag and engine label; those are the sources that tie to a specific production date.
- Find the model and serial number tag (commonly under the seat, on the frame rail, or near the rear fender pan)
- Verify the model number reads 917270770 (sometimes shown as 917.270770)
- Write down the serial number exactly as shown
- Locate the engine model/type/code label on the engine shroud or valve cover
- Record any engine date code (often indicates month and year)
What the model-specific documentation confirms
The manual pages for this tractor clearly label it as TRACTOR, model number 917.270770 and include parts breakdowns such as steering, seat, lift, and mower deck assemblies. That confirms the exact model identity, even when a production year is not listed.
Quick reference: what each ID tells you
| Item you check | What it confirms | Why it helps |
|---|---|---|
| Model number (917270770) | Exact tractor model | Ensures correct diagrams and parts match |
| Serial number | Production run identifier | Best clue for narrowing build timeframe |
| Engine model/type/code | Exact engine version | Helps match tune-up and fuel system parts |
| Engine date code | Engine build date | Often narrows the tractor’s build window |
Why it matters
Craftsman tractors can have mid-run changes; using the serial number and engine codes helps you order the correct belts, blades, and deck hardware for your exact configuration.
Last updated: February 2026
