Owner’s manual
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What size belt does a 42 in Craftsman take?
A “42-inch Craftsman” belt size depends on the machine type. Your Craftsman 917377681 is a gas walk-behind mower, not a 42-inch riding mower deck; the belt used on this model is the 21-inch drive belt shown in the parts list as belt, 21-in 532406712. For exact routing and adjustment, use the 917377681 owner's manual.
Identify which “42-inch” you have
“42-inch” usually refers to riding mower deck width, not a walk-behind mower. Use this quick check:
- Walk-behind mower (like 917377681): deck is typically 20 to 22 inches; belt drives the self-propel system.
- Riding mower: deck is often 42 inches; belt drives the cutting deck spindles.
- Zero-turn: may also use 42-inch decks but uses different belt layouts.
Belt sizing guidance (what to measure)
If you are working on a 42-inch riding mower (different model), we use these steps to match the correct deck belt:
- Confirm the full model number from the frame tag (not just “42”).
- Measure the old belt outside circumference (inches).
- Check belt top width (commonly around 1/2 inch on many decks).
- Compare the belt’s cross-section (A/4L, B/5L, etc.) if marked.
- Replace if the belt is glazed, cracked, stretched, or has missing chunks.
Common symptoms of the wrong belt
| Symptom | What it usually means |
|---|---|
| Belt slips or squeals | Belt too long, worn, or pulley/idler issue |
| Belt jumps off | Wrong width, misrouted, bent belt guides |
| Self-propel weak (walk-behind) | Stretched drive belt or worn drive components |
| Blades stop in tall grass (rider) | Deck belt worn, wrong size, or tension problem |
Why it matters
Using the correct belt size keeps proper tension on the pulleys and prevents premature wear on idlers, bearings, and the transmission drive system. On a walk-behind mower like Craftsman 917377681, the correct drive belt is key to consistent self-propel performance.
You can order the correct replacement parts for your Craftsman 917377681 from the parts list for this model, or search by model number on Sears PartsDirect.
Last updated: February 2026
What year is Craftsman Model 917377681?
Craftsman model 917377681 is a rotary walk-behind lawn mower model number, and the model number itself does not encode the manufacturing year. To identify the year, we use the mower’s product identification label (often showing a serial/date code) and confirm the format shown in the 917377681 owner's manual.
Where to find the date information
Look for the product ID label in these common spots on a Craftsman walk-behind mower:
- On the rear of the mower deck near the discharge opening
- On the top of the deck near the engine mounting area
- On the handle bracket area (left or right side)
- Near the wheel height adjuster area
- On the underside of the deck (clean the area first and tip the mower safely)
Safety first
- Disconnect the spark plug wire before inspecting around the blade or under the deck
- Tip the mower with the air filter and carburetor side up (to reduce fuel/oil leakage)
- Let the muffler cool completely before handling the mower
How to interpret what you find
Most Craftsman date codes are read from a serial number or date code on the ID label, not from the model number. Once you locate the label, match what you see to one of these common formats:
| What you see on the label | What it usually means | What to do next |
|---|---|---|
| A full date (MM/DD/YY or similar) | Direct build date | Use that as the mower’s manufacturing date |
| A serial number with embedded digits | Date is encoded in the serial | Compare the pattern to the manual’s ID label section |
| Engine model and code (Tecumseh/Briggs, etc.) | Engine build date, not always mower build date | Use it as a close reference point if mower date is missing |
Why it matters
Knowing the correct year helps us match the right drive parts and deck hardware for your Craftsman 917377681, such as the belt, 21-in 532406712 or lawn mower blade adapter 532418373, because part revisions can change across production runs.
Ordering the right parts
We recommend ordering by exact model number (917377681) and then confirming with the ID label details when selecting parts from the diagram and list. If you need to search beyond the parts shown for this model, use Sears PartsDirect.
Last updated: February 2026
How to find Craftsman mower parts?
For your Craftsman gas walk-behind lawn mower model 917377681, we find the right parts by matching the exact model number from the product label, then using the illustrated parts list and diagrams to identify the correct part name and reference number before ordering.
Where to find the model number
On Craftsman walk-behind mowers like 917377681, the model/serial label is typically on the rear frame area between the wheels. Once you confirm the model number, use the 917377681 owner's manual to cross-reference the repair parts diagrams and key numbers.
Quick checklist
- Locate the model/serial label on the rear frame between the wheels
- Write down the full model number: 917377681
- Use the parts diagrams to find the key number and part description
- Match that description to the part listing before you order
- If you are unsure between similar items (nuts, washers, pulleys), compare where it installs on the diagram
How to identify the exact part you need
The most reliable method is to use the exploded-view diagrams and the parts key. For example, the manual shows common drive and handle parts such as the handle, anti-fold bracket, V-belt, pulleys, and small hardware.
Here are a few examples of parts available for this model that people commonly replace:
- Drive belt: belt, 21-in 532406712
- Drive pulley: pulley.1.pie 532194128
- Idler pulley options: husqvarna lawn mower idler pulley 532166042 and husqvarna lawn mower idler pulley 532166043
- Blade mounting component: lawn mower blade adapter 532418373
Common “look-alike” parts and how to choose
Small hardware can look similar, so we recommend matching by diagram location and description, not just size.
| Part type | What it affects | What to match before ordering |
|---|---|---|
| Belt | Self-propel drive | Belt routing and length description |
| Pulley | Drive engagement | Pulley position (drive vs idler) |
| Nut/washer/E-ring | Wheel or drive hardware | Exact placement on diagram and part description |
Why it matters
Using the exact model number and diagram callouts prevents ordering the wrong belt, pulley, or hardware. That saves time and helps your mower’s self-propel and cutting systems operate correctly.
To order, choose the part from the list for model 917377681 on this page; for broader model searches and parts lookup, use Sears PartsDirect.
Last updated: February 2026
What is e0 E10 gas for lawn mowers?
E0 and E10 describe ethanol content in gasoline. For your Craftsman 917377681 gas walk-behind lawn mower, E0 is ethanol-free gas and E10 is regular unleaded with up to 10% ethanol; E10 is the common maximum blend used in small engines. See the fuel specifications in the 917377681 owner's manual.
What E0 vs. E10 means
- E0: 0% ethanol (ethanol-free gasoline)
- E10: up to 10% ethanol blended into gasoline (common “regular unleaded”)
- E15/E20/E85: higher ethanol blends; avoid these in walk-behind mower engines
Quick comparison
| Fuel label | Ethanol content | Best use | Common problems when misused |
|---|---|---|---|
| E0 | 0% | Seasonal equipment, longer storage | Fewer storage-related fuel issues |
| E10 | Up to 10% | Normal mowing when fuel is fresh | Usually fine; can cause issues if old or water-contaminated |
| Above E10 | 15%+ | Not recommended for mower engines | Hard starting, surging, stalling, fuel system damage |
What we recommend for this mower
Your 917377681 uses unleaded regular gasoline. For best performance and fewer carburetor problems:
- Use fresh fuel (especially after winter storage)
- Keep the fuel can sealed; avoid fuel that has been sitting for long periods
- Wipe dirt from the cap area before refueling so debris does not enter the tank
- Use fuel stabilizer when storing fuel or the mower
- If the mower was stored with old fuel, drain and refill with fresh gas before troubleshooting further
Why it matters
Small carbureted engines are sensitive to fuel quality. Ethanol blends can absorb moisture and leave deposits during storage; that can clog carburetor passages and cause no-start or rough-running symptoms.
Related maintenance that helps starting and running
- Check engine oil level and use the correct seasonal oil viscosity
- Clean or replace the air filter on schedule
- Replace the spark plug at recommended intervals
- Keep the blade sharp so the engine is not overloaded
If you need common replacement items for this mower, you can order parts from the list for this model or search by model number on Sears PartsDirect.
Last updated: February 2026
