Maintenance checklist
Snow Blower Pre-Season Tune-Up: A Checklist to Run Before the First Storm
The worst time to find out your snow blower will not start is the morning after the first big storm, when every repair shop has a line out the door. A calm afternoon in the fall is the right time to check it over. This checklist walks through what to look at on gas and battery machines, in roughly the order you would do it, and flags the jobs worth handing to a shop.
Before you start
- Find your owner's manual (most manufacturers have them online by model number). Oil type, plug type, belt routing and torque values are model specific, so the manual beats any general guide, this one included.
- Write down your model and serial number. The model number alone is not always enough to order parts; see why the model number is only half the story.
- Work safely. Run engines only outdoors. Before touching the auger, impeller, chute or belts, shut the engine off, remove the key, and disconnect the spark plug wire (or remove the battery pack on battery models).
Engine checks (gas machines)
- Fuel. If gas was left in the tank over summer without stabilizer, it may have gone stale. Follow your manual on draining old fuel, then refill with fresh gas plus a stabilizer or with ethanol-free fuel if your manufacturer allows it. Old fuel is one of the most common reasons a snow blower will not start in fall. Our fuel and oil guide covers what to buy.
- Oil. Check the level and condition. If you did not change it at the end of last season, change it now with the weight the manual specifies for cold-weather use. Many snow blower engines call for a specific viscosity for winter temperatures.
- Spark plug. Pull it and look. A plug that is heavily fouled, has a worn electrode or a cracked insulator should be replaced with the type in your manual. Set the gap per the manual. Plugs are cheap insurance.
- Primer and choke. Make sure the primer bulb is not cracked and the choke lever moves freely.
- Fuel line and shutoff. Look for cracks, leaks or a stiff, brittle fuel line, and check that the fuel shutoff valve (if you have one) opens and closes.
- Electric start. If your machine has a plug-in electric starter, test it with an outdoor-rated cord. See our extension cord guide.
- Test run. Outdoors, start it and let it warm up. Listen for surging, hunting or stalling, which often point to a fuel or carburetor issue that a shop can address before the rush.
Battery machine checks
- Charge every pack fully and confirm each one shows a full charge on the indicator
- Check the charger's status lights and look for damaged cords or bent contacts
- Inspect battery terminals on the machine for debris or corrosion
- Test the safety key and the start sequence
- Check for firmware or recall notices from the manufacturer
- Plan where packs will live indoors at room temperature between storms, as most manufacturers recommend
Battery machines have fewer engine chores, but the auger, chute, scraper and tire checks below still apply.
Auger, impeller and shear pins
With the plug wire disconnected or the battery removed:
- Shear pins (two-stage): check each pin that connects the auger to its shaft. They are designed to break if the auger hits something solid, protecting the gearbox. Replace any bent or cracked pin with the correct part, never an ordinary bolt. Here is why an ordinary bolt is not a shear pin. Keep a few spares in a bag zip-tied to the handle.
- Auger and impeller: look for bent flights, cracks and anything wrapped around the shaft such as rope, newspaper or wire.
- Paddles (single-stage): rubber or composite paddles wear down. If they no longer reach close to the ground, replace them per the manual.
- Gearbox (two-stage): look for oil leaks around the auger gearbox. A leak can be a seal issue worth having checked. See our gearbox leak decision guide.
Belts and drive
Most two-stage blowers have an auger belt and a drive belt, often behind a plastic cover. Remove the cover per the manual and look for:
- Cracks, glazing (a shiny, hardened surface), fraying or missing chunks
- A belt that looks stretched or sits low in the pulley
- Signs of slipping, like black dust inside the cover
If a belt looks worn, replace it now and keep the old one as an emergency spare only if it is still serviceable. On friction-disc drives, a glazed or worn rubber ring causes weak or no self-propulsion; our friction disc inspection guide shows what to look for.
Housing, scraper bar and skid shoes
| Part | What to look for | Why it matters |
|---|---|---|
| Scraper bar | Worn thin, uneven or chewed edges | A worn bar leaves a layer of snow and lets the housing itself wear |
| Skid shoes | Worn flat, uneven height side to side | Sets auger height; uneven shoes leave ridges and can let the housing scrape |
| Housing | Rust, cracks, loose bolts | Small rust spots are easy to treat now; loose bolts become lost bolts |
| Chute and deflector | Smooth rotation, no cracks, controls not seized | A stuck chute means stopping constantly or throwing snow where you do not want it |
Most skid shoes and scraper bars are reversible or replaceable. For gravel driveways, setting skid shoe height correctly is critical; see the gravel skid shoe check.
A light coat of a non-stick spray or silicone in the chute and on the auger housing can help wet snow slide instead of sticking. Use a product meant for that purpose and follow its label.
Tires, controls and lights
- Tires: inflate to the pressure on the sidewall or in the manual, and keep both sides even so the machine tracks straight
- Cables: drive and auger control cables should move smoothly without fraying; adjust per the manual if engagement feels off
- Safety check: with the engine running outdoors, engage the auger, then release the control. The auger and impeller should stop promptly. If they keep turning, do not use the machine until it is adjusted or repaired
- Lights and heated grips: test them while the engine is running
- Clean-out tool: make sure it is still clipped to the machine, ready for clogs
When to hand it to a shop
Book service early in the fall if you find any of these: an engine that surges or will not idle even on fresh fuel, a gearbox leak, a drive that slips after adjustment, damaged auger flights or bearings, or controls that do not stop the auger. Shops tend to get busiest right after the first storm, so earlier is better.
FAQ
When should I tune up my snow blower?
In the fall, before the first expected snowfall. That gives you time to order parts and get into a repair shop before the post-storm rush.
Do I need to change snow blower oil every year?
Most manufacturers recommend changing the oil at least once a season or after a set number of hours. Check your owner's manual for the exact interval and oil viscosity.
Can I use a regular bolt instead of a shear pin?
No. A shear pin is designed to break before the gearbox or auger is damaged. A stronger ordinary bolt can transfer that force into expensive parts. Use the manufacturer's shear pins.
What spare parts should I keep on hand?
At minimum: shear pins, a spark plug for gas machines, and an auger or drive belt. A scraper bar and skid shoes are also worth keeping if yours are close to worn out.
The bottom line
A pre-season tune-up takes an afternoon and saves you from the classic first-storm surprise. Fresh fuel, fresh oil, a good plug, a few spare shear pins and a working auger stop are the core. When something is beyond a basic fix, book the shop in the fall rather than the morning after a storm. Then, at the end of winter, follow our storage checklist so next fall's tune-up is easy.