MTD 31AS3CAD799 snow thrower Parts

For your MTD snow thrower, the model number is printed on the machine’s model and serial number label. On many MTD snowblowers, that label is on the rear of the unit or near the frame by the engine; confirm the exact label location and format in the 31AS3CAD799 owner's manual.

Check these common label locations first (wipe off snow, salt, and grime so you can read it):

• Rear of the snowblower frame, behind the engine
• Side of the frame near the wheels or axle area
• Near the auger housing where the front housing meets the frame
• Under or near the belt cover area (if your unit has a removable cover)
• On the handle support area near the lower handle mounting points

Most labels include a model number and a serial number. Record both exactly as shown.

• Model number: identifies the exact design and parts list (example format: 31AS3CAD799)
• Serial number: identifies the production run (useful when parts change by serial range)
• Brand: MTD (sometimes shown as a parent brand or product line)

• Copy letters and numbers exactly (including dashes)
• Take a clear photo before the label wears further
• If the label is scratched, try a flashlight at an angle to make the imprint easier to read

The model number is how we match the correct parts diagrams and replacement parts for your snowblower, including wear items like belts, skid shoes, and shear pins. Using the wrong model number is the most common reason customers order the wrong part.

Last updated: February 2026

A typical gas snowblower lasts 10 to 15 years with normal residential use and routine maintenance. For your MTD 31AS3CAD799 snow thrower, following the seasonal lubrication, belt checks, and proper fuel storage steps in the owner's manual is what most directly extends service life.

• Maintenance frequency (oil changes, lubrication, belt inspections)
• Operating conditions (wet heavy snow, gravel drives, impacts with ice chunks)
• Storage habits (fuel stabilizer, dry storage, rust prevention)
• Wear items (belts, skid shoes, shear pins)
• How quickly you stop after a jam (reduces gearbox and belt stress)

Your manual calls out several time-based checks that strongly influence longevity:

These parts are normal wear items; replacing them on time helps the machine last longer overall.

• Snowblower ground drive belt 754-04013 (loss of drive, slipping, burning rubber smell)
• MTD snowblower auger drive belt 754-04014 (auger slows or stops under load)
• Skid shoe 784-5580 (scraping, poor clearing height, uneven wear)
• Shear pins (auger stops after hitting an obstruction; keep spares on hand)

A snowblower usually does not “wear out all at once”; it loses performance as belts glaze, lubrication dries out, and fuel degrades in storage. Staying on the manual’s schedule and replacing wear parts early typically adds years of reliable starting, throwing distance, and drive performance.

Last updated: February 2026

Yes, it’s worth fixing an older MTD snow thrower like model 31AS3CAD799 when the machine is structurally sound and the repair is limited to common wear items (belts, skid shoes, shear pins, cables). Regular maintenance and safe operation practices in the owner's manual help you get reliable performance for many more seasons.

Use this checklist to make a clear repair vs. replace call:

• Fix it if the engine runs well, the auger housing is solid, and the issue is a wear part (belt, skid shoe, shear pin, cable).
• Fix it if the machine only needs adjustment, lubrication, or routine service (oil, spark plug, fasteners).
• Replace it if the frame or auger housing is badly rusted through, cracked, or bent.
• Replace it if major drivetrain components are failing (for example, repeated transmission problems) and the total repair cost approaches the value of a working unit.
• Fix it if you can do the work yourself and parts are available.

These are typical, high-impact repairs that restore performance:

• Replace worn belts (auger and drive) when you see cracking, fraying, or slipping.
• Replace worn skid shoes to protect the auger housing and improve scraping height.
• Replace shear pins after an auger jam to protect the gearbox.
• Tighten and re-check fasteners and hardware periodically.

A snowblower that’s maintained and repaired with correct parts stays safer and more dependable. The manual calls out routine checks like belt condition, fastener tightness, and replacing wear items such as skid shoes and shave plate to keep the machine operating properly and reduce damage.

Before any inspection or repair:

• Stop the engine and wait for all moving parts to stop.
• Disconnect and ground the spark plug wire.
• Never clear the chute or auger area by hand; use the clean-out tool if equipped.
• Re-check control engagement after repairs and adjust as needed.

Last updated: February 2026

A 2-stage snowblower is the better choice for most homeowners because it handles typical driveway snowfalls well, throws snow farther, and is simpler to maintain. A 3-stage is better when you regularly face deep, heavy, wet snow or end-of-driveway plow piles and want faster intake.

• 2-stage: Auger pulls snow in, impeller throws it out; strong all-around performance.
• 3-stage: Adds an accelerator (a third “intake” component) to feed snow faster; best for very heavy, deep snow.
• Maintenance: 2-stage is typically simpler; 3-stage has more moving parts to inspect.
• Best use case: 2-stage for most driveways; 3-stage for frequent storms, dense snow, and plow berms.

Use these practical decision points:

• Choose 2-stage if you clear 1 to 2 cars wide, get mixed snow, and want easier upkeep.
• Choose 3-stage if you often clear deep drifts, wet snow, or end-of-driveway piles and want quicker clearing.
• If you hit hidden objects (ice chunks, gravel, newspapers), prioritize a machine that uses proper shear pins and keep spares on hand.
• If your current machine struggles, check belt condition and traction adjustments before upgrading.

In real-world use, “better” usually means matching the machine to your snow type and protecting the drivetrain. For example, when an auger jams, the snowblower is designed to shear the auger shear pins to help prevent gearbox damage. Using the correct shear pins and keeping the auger and drive system maintained helps any 2-stage or 3-stage machine perform reliably.

• Warm the engine up before heavy throwing so it reaches full power.
• Inspect belts for cracking or fraying; many snowblowers use both an auger belt and a drive belt.
• Lubricate pivot points and drive components on schedule.
• Replace sheared pins only with the correct type.

Helpful resources for your MTD 31AS3CAD799:

• Owner's manual
• How to replace a snowblower belt video

Last updated: February 2026