Snowblower Buying & CareEvery pass a two-stage snowblower makes rides on two wear parts most owners never look at until something goes wrong. The skid shoes are the two feet mounted at the bottom sides of the auger housing; the scraper bar (also called the shave plate or cutting edge) is the blade bolted along the housing's bottom rear edge. Together they set the single most important measurement on the machine: how high the auger housing floats above the surface you are clearing. Get it right and the machine scrapes clean without eating gravel or grinding itself down. Get it wrong and you leave a layer of snow behind, throw stones, or wear into parts that were never meant to touch the ground.
What skid shoes and the scraper bar actually do
The two parts divide the job. The skid shoes — made of metal or poly, one on the right and one on the left at the bottom of the auger housing — create the space between the ground and the cutting edge. They carry the front of the machine, protect the surface being cleared, and keep debris like gravel from entering the auger and the chute. The scraper bar does the actual scraping: it peels the last layer of snow and ice off the surface and feeds it into the auger. Snapper's manuals state the operating rule plainly: on smooth surfaces such as concrete or asphalt, the scraper bar should scrape the surface; on gravel, it must ride high enough that it will not pick up gravel or debris — and the height of the scraper bar is controlled by raising or lowering the skid shoes. The shoes are the adjustment; the bar is the effect.
Because both parts work by touching the ground, both are consumables. They wear by design, slowly, every hour the machine runs — which is why the manuals treat them as inspection and adjustment items rather than fit-and-forget parts, and why the scraper bar is built to be repositioned as it wears: several manuals note the bar is adjustable to compensate for wear, and one notes it may even be reversed for extended operation before it truly needs replacing.
The wear inspection: adjust, reverse, or replace?
Do this inspection on a hard, flat surface with the engine off, before reaching for a wrench. Five checks, in order:
- Is the machine leaving snow behind? Worn or unevenly adjusted skid shoes are a documented cause of a snowblower leaving more snow than it should. If the leftover layer is thicker on one side than the other, suspect uneven shoes before anything else.
- Are the shoes the same height? Sight along the bottom of the housing. Each shoe should hold the cutting edge the same distance off the ground on the right and the left; a housing that sits crooked wears one side faster and clears unevenly.
- How much shoe is left? Shoes wear from the bottom up. A shoe worn thin, holed, or ground to an angle has done its life — replace it, and always before the wear reaches the point where the auger housing itself starts taking the abrasion.
- How much scraper bar is left? The Ariens manual's warning is the one to internalise: damage to the auger/impeller housing will result if the blade wears down too far. A bar worn to a thin, rounded, or uneven edge can often be repositioned in its slots to expose fresh edge (the adjustment manuals describe), and on designs that allow it, reversed — the Craftsman manual notes the scraper bar may be reversed for extended operation. A bar worn past its adjustment range, cracked, or bent is a replacement.
- Is the setting wrong rather than the parts? New or healthy parts at the wrong height produce the same symptoms as worn ones. If the parts have material left, the fix is the adjustment procedure below — free, and ten minutes.
Planned step images for this guide: a worn skid shoe beside a new one showing the material lost; the scraper bar's worn edge close up; the spacer placed under the centre of the scraper blade during adjustment; both tires being checked with a pressure gauge; the skid shoe hardware being loosened and the shoe slid to the surface; and a gauge or coin check of the finished clearance at both sides of the housing. Each image belongs at its step, showing the exact part or action the step names.
Before you adjust: surface and tire checks
An adjustment is only as honest as the setup it is made on, and the manuals are specific about two preconditions that blog advice usually skips. First, position the machine on a hard, flat, smooth, level surface — Ariens and Craftsman both specify it, because a clearance set on a sloped or rough floor is a fiction. Second, make sure both tires are equally inflated before touching anything: the Craftsman manual puts proper tire pressure at 14 to 17 PSI, never exceeding the sidewall maximum, and the logic is simple — a soft tire on one side drops that side of the housing, and you would be adjusting the shoes to compensate for a tire problem, baking the error in. Check the tires, then adjust.
Procedure: setting the clearance with the spacer method
The manufacturers describe the same core method, and it needs no measuring tools beyond a spacer of the thickness you want:
- Stop the engine and follow your manual's safety section before doing any service work — the manuals put that warning at the head of the service chapter for a reason.
- Position the machine on the hard, flat, level surface, with both tires checked and equally inflated.
- Choose your clearance from the table in the next section, and find a spacer of exactly that thickness — a strip of wood of the right dimension is the manual's own suggestion; Snapper describes resting the scraper bar on a wood strip equal in thickness to the desired height.
- Place the spacer under the centre of the scraper blade so the bar rests on it, with the bar parallel to the ground surface.
- Loosen the skid shoe hardware on both sides and let each shoe slide down until it sits flat on the surface.
- Tighten the hardware with the shoes adjusted equally — Ariens is explicit: keep the housing level by adjusting the skid shoes equally, and both shoes should end parallel to the surface.
- Remove the spacer and verify: the scraper bar should now hover at exactly the spacer's thickness across its full width. Check both ends, not just the middle.
If the skid shoes alone cannot reach the height you need, later-model scraper bars adjust independently: loosen the nuts securing the bar to the auger housing, raise or lower the bar to position, and tighten with the bar parallel to the bottom edge of the housing.
What success looks like: on a test pass over clean pavement, the machine leaves an even result across its full width — no thicker stripe on one side — the scraper does not catch or chatter on surface joints, and on gravel it carries snow without picking up and throwing stone. Measured back in the garage, the clearance matches your chosen figure at both ends of the bar.
Clearance by surface: the manufacturer numbers, reconciled
Here the published guidance genuinely disagrees, and pretending otherwise would be a disservice. The figures below are each attributed to their source; the pattern to notice is that everyone agrees on smooth pavement, and the gravel figures spread because manufacturers set them for their own housings and auger designs:
| Surface | Clearance | Source |
|---|---|---|
| Hard, smooth (concrete, asphalt) | 1/8 in (3 mm) | Ariens operator manual; Craftsman manual specifies the same 1/8 in between scraper bar and surface |
| Uneven or rough pavement | 1/4 in | Secondary maintenance guidance (Powered Outdoors recommendations) |
| Gravel or uneven ground | 1/2 in | Secondary maintenance guidance (Powered Outdoors recommendations) |
| Uneven or gravel surfaces | 1-1/4 in (30 mm) | Ariens operator manual, for its machines |
The spec-verification rule that resolves the conflict: your own machine's manual outranks any general table — including this one. Ariens' 1-1/4 in gravel figure is far more conservative than the 1/2 in general recommendation, and for an Ariens machine it is the number to start from; the cost of extra clearance is a slightly thicker layer of snow left on the gravel, while the cost of too little is gravel through the chute and accelerated wear. When in doubt, start high and lower in small steps until the machine stops picking up stone — clearance is a dial, not a verdict.
Procedure: replacing a skid shoe and a scraper bar
When the inspection says replace, both jobs are bolt-off, bolt-on work — with the same safety setup: engine off, and your manual's safety section followed before the machine is tipped or reached under.
- Skid shoes: loosen and remove the hardware holding the worn shoe, noting its position in the adjustment slots. Fit the new shoe — shoes come in metal and poly versions, matched to your model — and set it using the spacer method above rather than eyeballing its position. If the other side's shoe is near the end of its life too, doing both in the same session keeps the housing level honest.
- Scraper bar: tip the unit back onto its handlebar with the housing supported, as the Ariens adjustment procedure describes, to reach the bar's hardware. Remove the carriage bolts and nuts securing the bar to the auger housing — that hardware removal is the whole disassembly, per the Craftsman manual.
- Fit the new bar, and before fully tightening, position it parallel with the working surface (Craftsman's instruction) and flush in line with the skid shoes.
- Tighten all hardware evenly, return the machine to its wheels, and re-run the spacer-method adjustment from the procedure above — a new bar changes the geometry the shoes were set against, so the clearance check is part of the replacement, not an optional extra.
- Verify with the success check: an even pass, no catching, correct measured clearance at both ends of the bar.
FAQ
The machine leaves a stripe of snow on one side. Which part is that? Start with the skid shoes: worn or unevenly adjusted shoes are a documented cause of snow left behind, and a one-sided stripe is the signature of the housing sitting lower on one side. Check tire pressures first — a soft tire fakes the same fault.
Can worn skid shoes really damage the machine? Yes — indirectly but expensively. The shoes exist to hold the housing off the ground; worn through, the housing itself becomes the wear surface. The manuals' advice is to replace shoes when worn, and always before the auger housing is damaged.
Is the scraper bar supposed to touch the ground on pavement? It scrapes the surface on smooth pavement per the manuals, but the set clearance is still a small gap — 1/8 in in both the Ariens and Craftsman specifications. "Scraping" describes the effect on snow, not metal grinding on concrete.
How often should clearance be checked? The manuals frame shoes and bar as condition-based items: check them at the start of the season, after any change of surface (a new gravel area is the classic trigger), and whenever the machine starts leaving snow behind or picking up debris it did not before.