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How to tell the year of a snowblower?
To tell the year of a snowblower like the Lawn-Boy model 320, we look for a date code or serial number tag on the machine and decode it. Many snowblowers use a date code where the first digit indicates the year and the remaining digits indicate the day of the year it was built.
Where to find the date code or serial tag
Check these common locations on a gas snowblower frame and controls:
- On the rear frame near the handles or handle tube
- On the side of the engine shroud or recoil starter housing
- Near the auger housing, typically on the right or left sideplate
- Under a belt or drive cover area (after the unit is cool and off)
- On the underside of the control panel or near the chute support
If the tag is missing or unreadable, replacing missing fasteners and covers can help keep the ID tag area protected going forward (for example, a correct-fit fastener like the toro snowblower screw 12-3270).
How the date code format usually works
A very common format is a 4-digit date code like 5240:
- 1st digit = year within a decade
- Last 3 digits = sequential day of the year (001 to 365)
Example decode
| Date code | Year digit | Day of year | What it means |
|---|---|---|---|
| 5240 | 5 | 240 | Built on the 240th day of a year ending in “5” |
To convert “day 240” into a calendar date, count forward from January 1 of that year (day 240 is late August in a non-leap year).
Quick tips to narrow down the exact year
Because the first digit can repeat every 10 years, we narrow it down using what we can see on the machine:
- Compare the engine model family and emissions label style
- Look at the control design (chute crank style, bail shape, drive engagement)
- Check for original paint/decals and safety label styling
- Match major assemblies (drive system, rotor/auger setup) to parts diagrams
- Use the full model identification shown on the tag (for this page: 320 (28220-8900001 & UP))
Why it matters
Knowing the build year helps us match the correct parts list and avoid ordering the wrong drive belt, brake spring, or hardware. It is especially important on older snowblowers where mid-run design changes are common.
Last updated: January 2026
What is the life expectancy of a snowblower?
Most gas snowblowers like the Lawn-Boy 320 typically last 10 to 20 years with normal seasonal use and consistent maintenance; many reach 20+ years when they are stored correctly and wear items (belts, springs, fasteners) are replaced before they cause bigger damage.
Typical lifespan by snowblower type
| Snowblower type | Typical life expectancy | What usually ends it |
|---|---|---|
| Gas (2-stage and many single-stage) | 10 to 20 years | Neglected fuel system, worn drive/auger components |
| Electric corded | 5 to 10 years | Motor wear, switch/cable damage |
| Battery electric | 5 to 10 years | Battery aging, electronics issues |
What makes a snowblower last longer
We see the longest life when owners stay ahead of fuel, lubrication, and wear parts.
- Use fresh fuel and stabilize it before storage
- Change engine oil on schedule (gas models)
- Keep the auger/rotor area clear of packed snow and debris
- Replace worn drive components early (belt, springs, hardware)
- Store it dry, covered, and off-season ready (empty or stabilized fuel)
Wear parts that commonly affect longevity
Small parts can prevent expensive damage when replaced promptly.
- Drive belt wear or glazing: slipping, burning smell, weak drive
- Springs and brake components: poor engagement, inconsistent stopping
- Loose or missing fasteners: vibration, misalignment, premature bearing wear
If you are refreshing hardware on this model, match the original fastener style and length; for example, a model-listed fastener like the toro snowblower screw 12-3270 helps keep assemblies tight and aligned.
Why it matters
A snowblower usually does not “wear out” all at once; it loses performance gradually. Staying ahead of fuel issues and replacing wear items on time protects major components like the drive system, rotor/auger shafting, and housings.
Last updated: January 2026
What is the most common reason snowblower won't start?
The most common reason a Lawn-Boy 320 gas snowblower will not start is fuel-related: old gasoline or a carburetor that is gummed up from stale fuel. Start by draining old fuel, refilling with fresh gas, and then checking ignition and safety interlocks.
Quick checks (fastest wins first)
- Confirm the safety key is fully inserted and the stop switch is in the RUN/ON position.
- Turn the fuel valve ON (if equipped) and make sure there is fuel in the tank.
- Use fresh gasoline; if the fuel is older than about 30 days, replace it.
- Set choke and primer correctly for a cold start (too much priming can flood the engine).
- Check the spark plug wire is firmly connected.
Most common causes and what to do
| Symptom | Most likely cause | What we recommend |
|---|---|---|
| Starts briefly, then dies | Stale fuel or varnished carburetor | Drain fuel, clean carburetor bowl/jet, refill with fresh fuel |
| No start, no sputter | Safety key/kill switch issue or no spark | Re-seat key, inspect switch, test spark plug |
| Strong fuel smell | Flooded engine | Choke OFF, throttle to RUN, pull starter several times, let it sit 10 to 15 minutes |
| Starts only with starting fluid | Fuel delivery problem | Check fuel line, tank vent, and carburetor passages |
Parts that commonly get involved
If you find a loose guard or hardware interfering with controls or linkages, replace missing fasteners with the correct OEM-style hardware.
Why it matters
Fuel varnish and restricted airflow are the top reasons small engines lose starting reliability. Fixing the fuel system first prevents repeated no-starts, reduces plug fouling, and helps protect the carburetor and recoil starter from excessive pulling.
Last updated: January 2026
How to tell if a snowblower auger belt is bad?
On the Lawn-Boy 320 gas snowblower, a bad auger belt shows up as an auger that spins slowly, stops under load, or will not engage at all; you may also notice belt squeal or a burning-rubber smell. A quick inspection under the belt cover usually confirms cracking, fraying, glazing, or stretching.
Quick signs the auger belt is failing
- Auger or impeller does not turn when you squeeze the auger control
- Auger starts, then slips or stops when it hits heavier snow
- Squealing noise when engaging the auger (belt slipping)
- Burning rubber odor after engagement (belt overheating)
- Visible cracks, frayed cords, shiny glazing, or missing chunks on the belt
- Belt looks loose even with the idler/brake engaged (stretched belt)
What to check (safe, practical inspection)
- Shut the engine off, remove the key (if equipped), and let all moving parts stop.
- Disconnect the spark plug wire so the engine cannot start accidentally.
- Remove the belt/drive cover and inspect the belt’s condition and tension.
- Rotate the auger by hand (with the engine off) to feel for binding that could have damaged the belt.
If the belt is worn or stretched, replacing it restores proper power transfer to the auger. For this model, the auger drive belt is commonly listed as drive v-belt 71-5381.
Symptoms and what they usually mean
| Symptom | Most common cause | What to do next |
|---|---|---|
| Auger will not engage at all | Belt broken or off the pulleys | Inspect belt routing; replace belt if damaged |
| Auger engages but slips in snow | Belt glazed or stretched | Replace belt; check idler/brake movement |
| Burning smell or squeal | Belt slipping from low tension or contamination | Replace belt; clean pulleys; check spring tension |
| Belt keeps failing | Auger/impeller binding or pulley/idler issue | Check for seized bearings, bent pulley, misalignment |
Why it matters
A slipping auger belt reduces throwing distance and can overheat, leaving you without auger power mid-job. Catching belt wear early also helps protect pulleys, idlers, and the auger drive system from extra strain.
Last updated: January 2026
