Owner’s manual
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What year is Craftsman Model 917379070?
Craftsman rotary lawn mower model 917379070 does not have the manufacturing year encoded in the model number itself. To find the year, we use the mower’s product identification label (often called the model and serial tag) and match the serial or date code format shown in the owner's manual.
Where to find the date information
Look for a label on the mower that lists the model and serial information. Common locations include:
- On the rear of the deck near the discharge opening
- On the top of the deck near the engine mounting area
- Near the handle mounting brackets
- On the underside of the deck (clean the area first)
How to determine the year (what to use)
Once you find the label, use these items to identify the build year:
- Serial number (most reliable)
- Any date code printed on the tag
- Engine model and code information (helpful when the mower tag is missing)
- Parts list breakdowns in the manual to confirm you are reading the correct tag
Quick check: model number vs. serial number
| Item | What it tells you | Example |
|---|---|---|
| Model number (917379070) | Identifies the mower design and parts | 917379070 |
| Serial or date code | Identifies when it was built | Varies by format |
Why it matters
Knowing the build year helps us match the correct Craftsman parts and hardware for your mower, especially for wear items like the lawn mower blade 532406713, drive components, and control cables.
If you are servicing the drive system, the manual’s diagrams and parts lists also help confirm the correct assemblies for this model.
Last updated: February 2026
What size belt for a 42 in Craftsman lawn mower?
A 42-inch deck belt size is for a riding mower or lawn tractor, not for the Craftsman rotary walk-behind mower model 917379070. For model 917379070, the drive system uses a V-belt (not a 42-inch deck belt); use the belt specified in the owner's manual for the correct fit.
How to identify the right belt for Craftsman 917379070
On this walk-behind mower, the belt you replace is typically the self-propel (drive) belt, not a deck belt.
Check these details before ordering:
- Confirm the mower is model 917379070 (walk-behind), not a 42-inch riding mower
- Look up the belt in the drive or gear case section of the parts list in the manual
- Match the belt by application (drive/self-propel) rather than deck size
- Inspect the old belt for cracking, glazing, or stretching
- Verify the belt routing and pulley locations before removal
What we know for this model
The documentation for Craftsman 917379070 lists a V-belt in the drive system breakdown.
| Mower type | Belt type | What it drives |
|---|---|---|
| 42-inch riding mower/tractor | Deck belt | Mower deck blades |
| Craftsman 917379070 walk-behind | V-belt | Self-propel drive system |
Why it matters
Ordering a “42-inch deck belt” for a walk-behind mower usually results in the wrong length and profile. Using the correct V-belt helps the drive pulley and gear case engage properly so the mower moves consistently.
Related parts that often get checked with a belt
If the mower still slips or will not move after belt replacement, we also check common wear items in the drive system:
- Belt 532157769
- Drive cable condition and adjustment
- Drive wheel tread and engagement
- Pulley alignment and debris buildup
Last updated: February 2026
How to find Craftsman model number?
On a Craftsman walk-behind mower like model 917379070, the model number is typically printed on a product label on the mower deck (often near the rear discharge area) or on the rear housing near the height-adjustment hardware. Use the diagrams and identification info in the owner's manual to match the label to the correct parts list.
Where to look on the mower
Check these common label locations first:
- Top of the mower deck, near the rear discharge door or rear deflector
- Rear of the deck, above the axle area
- Side of the deck near a rear wheel height adjuster
- Handle support area where the lower handle mounts to the deck
- Under heavy grass buildup (clean the deck surface so the label is visible)
What the label usually shows
Most Craftsman labels include more than just the model number. Look for:
- Model number (for this mower: 917379070)
- Serial number (helps identify production run)
- Engine information (engine model/type and code, if listed)
| What you need | Why it matters | Example for this mower |
|---|---|---|
| Model number | Ensures the correct diagrams and part fit | 917379070 |
| Serial number | Helps confirm the right version when parts changed | Varies |
| Engine model info | Needed for engine-specific parts like carburetor or ignition | Varies |
Tips to avoid ordering the wrong parts
Once you find the model number, use it consistently when selecting parts.
- Match the model number exactly, including all digits
- If your mower is self-propelled, confirm drive parts by diagram before ordering
- Compare the part description to what you see on the mower (blade, belt, cable, wheel)
- Use the illustrated parts breakdown in the manual to confirm placement and quantity
Why it matters
Craftsman walk-behind mowers can look similar across multiple model numbers, but parts like the drive belt, control cable, and blade can differ. Using the exact model number keeps repairs accurate and prevents returns.
Last updated: February 2026
What are the common problems with Craftsman lawn mowers?
Common problems on the Craftsman 917379070 rotary lawn mower include no-start conditions (stale fuel, dirty air filter, disconnected spark plug wire, bad spark plug), loss of power from deck buildup or cutting too low, poor cut from a worn or loose blade, and self-propelled drive issues from belt wear or a belt off the pulley. See the owner's manual troubleshooting chart for the fastest checks.
Most common symptoms and what usually causes them
- Engine will not start: stale fuel, dirty air filter, spark plug wire off, bad spark plug, control bar not held to the handle
- Starts then runs weak or dies: water in fuel, restricted airflow (dirty filter), heavy grass load, grass packed under the deck
- Poor cut or uneven cut: worn or bent blade, blade loose, wheel heights set uneven
- Excessive vibration: loose or damaged blade, damaged blade adapter, bent crankshaft (stop using until inspected)
- Hard to push: grass too high, cutting height too low, debris buildup under the mower housing
- Self-propelled slows or quits: belt wear or belt off the pulley (common wear item)
Quick checks we recommend (in order)
- Safety and controls: Hold the control bar firmly against the handle; confirm it is not defective.
- Fuel quality: Drain stale fuel and refill with fresh gasoline; water in fuel causes hard starting and surging.
- Air and ignition: Clean or replace the air filter; reconnect the spark plug wire and replace the spark plug if fouled.
- Deck and cutting load: Raise cutting height and clean grass and debris from under the deck.
- Blade and adapter: Tighten the blade bolt; replace a worn blade such as the lawn mower blade 532406713 and inspect the lawn mower blade adapter 581547901.
- Drive system (self-propelled): Inspect the belt 532157769 for wear, glazing, or slipping.
Symptom-to-fix guide
| Symptom | What to check first | Common fix |
|---|---|---|
| Won’t start | Fuel, air filter, spark plug wire | Fresh fuel; clean/replace filter; replace spark plug |
| Loss of power | Cutting height, deck buildup | Raise height; clean underside of deck |
| Poor cut | Blade condition, wheel height | Sharpen/replace blade; level wheel settings |
| No drive/slipping | Belt condition and routing | Reinstall or replace drive belt |
Why it matters
Most “major” mower problems are basic maintenance items (fuel, airflow, blade condition, belt wear). Fixing those first prevents hard starting, protects the engine from overload, and improves cut quality.
Last updated: February 2026
What kind of gas do you put in a Craftsman push mower?
For the Craftsman rotary lawn mower model 917379070, use unleaded regular gasoline. This matches the fuel specification in the 917379070 owner's manual and helps prevent hard starting, poor performance, and fuel-system issues common with stale or incorrect fuel.
Fuel type and what to avoid
Use fresh, clean fuel from a properly sealed gas can.
- Use unleaded regular gasoline.
- Use fresh fuel; don’t keep gasoline from one season to the next.
- Avoid fuel contaminated with water, rust, or dirt (a rusty gas can is a common cause).
- Avoid E15 and higher ethanol blends in small engines; they can cause starting and running problems.
- Never mix oil into the gas on this mower (it’s a 4-cycle engine; oil goes in the crankcase).
Quick spec check (from the manual)
| Item | Spec for Craftsman 917379070 |
|---|---|
| Gasoline type | Unleaded regular |
| Fuel capacity | 1.6 quarts |
Why it matters
Using the correct gasoline and keeping it fresh reduces the most common “won’t start” causes listed for this mower, including stale fuel and water in fuel. It also helps protect the carburetor and fuel passages during storage.
If it won’t start after refueling
If you added fresh unleaded regular and it still won’t start, these checks usually find the problem:
- Confirm the control bar is held down (operator presence control).
- Check for stale fuel or water in fuel; drain and refill if needed.
- Inspect the spark plug and wire connection.
- Check the air filter for heavy dirt.
- Inspect for a loose blade or damaged blade adapter (a safety-related issue).
Last updated: February 2026
