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The one rule that matters more than every other instruction here: never clear a clogged chute or auger with your hand, even with the engine off and the key out. A jammed impeller stores rotational energy from the belt, and when the packed snow releases it springs back through whatever is in its arc. Shut the engine off, remove the key or battery, wait for all movement to stop, and use the clean-out tool clipped to the machine or a broom handle. Everything else on this page is about doing the job faster; that rule is about keeping your fingers.
Before the First Storm
Most snow blower damage is caused by things that were already on the driveway. Walk the whole area in daylight, before there is snow on it, and deal with:
- Extension cords and hoses — the classic shear-pin breaker, and invisible under four inches of snow.
- Doormats and welcome mats at the garage or side door. A mat wraps an auger instantly.
- Edging, landscape lights and irrigation heads along the driveway margin. Mark them with driveway stakes.
- The lip where a concrete pad meets asphalt, and any slab that has heaved. These catch a scraper bar hard.
- Newspapers and packages. Genuinely one of the most common causes of a broken shear pin.
Then check the machine: oil at the full mark, fresh or stabilized fuel, tire pressures equal (uneven pressure makes a self-propelled machine pull to one side), and the clean-out tool present on its clip. Start it once in early autumn. A fault found in October is an errand; the same fault at 5am on a storm day is a morning lost.
Setting the Skid Shoes and Scraper Bar
This five-minute adjustment decides whether the machine clears well or destroys your driveway, and most owners never touch it.
| Surface | Skid shoe setting | Result |
|---|---|---|
| Smooth concrete or asphalt | Scraper bar about 1/8 in above the surface | Clears close to bare pavement |
| Cracked or heaved pavement | 1/4 to 1/2 in clearance | Avoids catching slab edges |
| Pavers or brick | 1/2 in clearance | Protects joints and edges |
| Gravel | About 1 in clearance | Auger never reaches the stone |
Set them on a flat surface with the machine level: loosen the skid shoe bolts, slide a piece of wood of the right thickness under the scraper bar, let the shoes rest on the ground, and retighten. Check them each season — skid shoes are consumables and wear at different rates on each side.
Starting It, Cold
- Take it outside first. Never start or run a gas engine in a garage or any enclosed space, even with the door open. The CPSC Snow Thrower Safety Alert notes that people have died of carbon monoxide poisoning from leaving the engine running in an enclosed space.
- Insert the safety key fully. Most machines are completely dead without it, which accounts for a surprising share of no-start panic.
- Fuel valve open, throttle at fast, choke fully closed for a cold engine.
- Prime two or three firm presses if the machine has a primer bulb — and none at all if the engine is already warm. Over-priming floods it.
- Pull the recoil smoothly and fully, or press the electric start button. Once it fires, open the choke gradually over the first twenty seconds rather than all at once.
- Let it warm for a minute before engaging the auger. A cold engine bogs under load.
If it will not fire, work through the fault list in order rather than guessing — see the no-start diagnostic order.
The Pattern That Saves the Most Time
Amateur technique is to start at one edge and work across, which means every pass after the first throws snow onto ground you are about to clear, or into wind you are walking into. Do this instead:
- Plan for the wind first. Note which way it is blowing and commit to throwing downwind for the whole job.
- Make one pass straight down the middle of the driveway, throwing to whichever side is downwind and away from the house, cars and road.
- Work outward in laps, going down one side of the center line and back up the other, always throwing outward. You never re-clear thrown snow.
- Do the end of the drive last, and throw it clear of where the plow will pass again.
- Overlap each pass by about a third of the clearing width. Full-width passes stall the auger and leave ridges.
Two speed rules. Keep the engine at full throttle at all times — the impeller needs its speed to throw, and throttling back is the main cause of chute clogging. Then vary your ground speed, not the throttle: slow down in deep or wet snow, speed up in light powder.
Wet Snow, Deep Snow and the Plow Ridge
Heavy wet snow is where machines and tempers fail. Three things help materially.
Clear in stages. For a storm forecast at 12 inches or more, going out at 4 to 6 inch intervals is far easier than one pass at the end. The machine throws further, clogs far less, and the snow has not compacted. It also breaks the effort into pieces, which matters for the reason below.
Take half-width bites. In wet snow or a drift deeper than the intake, use half the clearing width per pass. You will make more passes and finish sooner, because you will not be stopping to unclog.
Spray the chute. A silicone spray or a light coat of cooking spray on the inside of the chute and auger housing before you start noticeably reduces sticking in wet snow. Reapply during long jobs.
For the compacted ridge the town plow leaves across the end of the driveway: attack it from the side in short bites at low ground speed, not head-on at full width, and expect to shear a pin if there is ice or gravel in it. This is the one job a single-stage or battery machine genuinely cannot do — if it is a regular feature of your winter, you need a two-stage machine.
Safety: The Full List
The CPSC Snow Thrower Safety Alert (Publication 5117) is one page long and worth reading in full. Its core instructions:
- "Stop the engine and use a long stick to unclog wet snow and debris from the machine." Never your hands.
- Keep hands and feet away from all moving parts.
- Never leave the machine running in an enclosed area.
- Add fuel outdoors, to a cold engine, never a running or hot one; keep the can capped and stored away from the house and from ignition sources.
- On an electric machine, always know where the power cord is.
Add to that: keep children and pets indoors while you clear, not watching from the yard — thrown objects travel a long way. Never point the chute at a person, a car, a window or the road. Wear eye protection, because ice chips come back at you. Wear boots with real grip; slipping while a running auger is in front of you is how feet get injured. And never work a slope up and down — cross it.
Finally, if the machine is clearing badly it is almost never a case of pushing harder. Something is set wrong, the shear pin has gone, or the snow is beyond the machine.
When You Finish
Run the machine for a minute with the auger engaged and no snow going through it, to throw out the wet slush that would otherwise freeze inside the housing overnight. Then brush the snow off the body rather than leaving it to melt and refreeze around the controls, and store it somewhere the fuel will not go stale — or add a stabilizer at the end of the season. Wipe the scraper bar and check the skid shoes for uneven wear while everything is still in your hand.
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