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Toro 3521 Snowblower, Parts and Manual

Toro 3521 Snowblower

The Toro 3521 is a two stage small frame 21 inch swath snowblower, sometimes referred to as a snowthrower.

Its engine is made by Tecumseh. is a 4 cycle motor type, has a motor size of 3.5 hp, and has a recoil engine starter.

It also has a friction disk transmission system.

This snowblower is designed to start first time, every time, is easy and simple to use and has great features. Is lightweight, easy to operate, dependable, quiet and clears snow simply and efficiently.

Depending upon the snow drift strength, and type of snow, it has the power to break through heavy wet snow and throw it a considerable distance.

It is important that any snowblower can shred snow efficiently, allowing it to be disbursed quickly and without the risk of it clogging up the internal working mechanisms of snowblower.

Having a copy of the snowblower manual is really important for a number of reasons as well.

Toro 3521 Snowblower Parts

Below are listed the main categories of the Toro 3521 parts, followed by a more detailed breakdown of which parts are normally available, and for which specific part of the snowblower they are needed for.

Toro 3521 Snowblower maintenance sets

Toro 3521 Snowblower belts

Toro 3521 Snowblower shave plates

Toro 3521 Snowblower shear pins

Toro 3521 Snowblower slide shoes

Toro 3521 Snowblower cables

Toro 3521 Snowblower friction wheels and discs

Toro 3521 Snowblower augers

Toro 3521 Snowblower engine parts

Toro 3521 Snowblower hardware

Toro 3521 Snowblower pulleys

Toro 3521 Snowblower tires and wheels

Toro 3521 Snowblower discharge chutes

Toro 3521 Snowblower auger gearboxes

Toro 3521 Snowblower Parts – Detailed Breakdown

Toro 3521 Auger Parts –

  • Auger bearings
  • Auger paddle
  • Impeller
  • Impell fan
  • Hub assembly
  • Plate cowl retainer


  • Differential axle
  • Hex shaft
  • Axle shaft
  • Short axle with bushings
  • Long differential axle
  • Axle weight – lbs 10/30

Batteries and Accessories

  • Battery charger
  • Battery cover
  • Dual port charger

Toro 3521 Bearings and Washings

  • Bearings
  • Ball bearing
  • Fang baring
  • Radial bearing
  • Struggling bearing
  • Flange
  • Polyline
  • Sealed
  • Sleeve
  • Slinger
  • Spacer
  • Spindle
  • Steeled housing
  • Height
  • ID
  • Material
  • OD
  • Size
  • Type
  • weight
  • Width

Belts –

  • Belt keeper
  • Belts by size

Toro 3521 Brakes

  • Brake assembly
  • Brake components
  • Brake linkage
  • Brake pads and shoes
  • Auger impeller brake pad
  • Brake arm assembly
  • Brake arm with pad
  • Brake lining



  • Interlock camp
  • Camshaft
  • Differential can
  • Camshaft assembly

Toro 3521 Carburettors

  • Carburettor bowls,
  • Carburettor gaskets,
  • Carburettor kits,
  • Carburettor nozzles
  • Choke lever is
  • Diaphragm kit
  • Foats, pins and kits
  • Gasket set
  • Main jet
  • Needles valves and kit
  • Climate bulbs
  • Springs

Chutes and deck size


Clevis pins


Toro 3521 Clutches

  • Dog sliding clutch
  • Clutch chain
  • Fork Clutch
  • Clutch paddle
  • Clutch gear
  • Clutch paddle sleeve
  • Clutch arm with brake pad
  • Jaw clutch
  • Right hand clutch lever grip

Connecting rods

Cotter pin



Cylinder head


  • Rotating danger decal
  • Differential lock decal


Toro 3521 Discharge chute

  • Chute gear
  • Chute assembly
  • Outer retaining ring
  • Worm mounting bracket
  • Inner retainer ring
  • Discharge chute base
  • Chute actuation dear
  • Worm gear chute
  • Chute flange keeper
  • Quarter discharge bracket
  • Chute crank knob
  • Deflector
  • Lower chute
  • Chute retainer

Drift cutter

Drive chain

Toro 3521 Drive components

  • Gear
  • Pinion shaft frame repair kit
  • Differential remote
  • Automatic differential
  • Pinion shaft
  • Hex shaft
  • Pin
  • Hub assembly lockout
  • Pinion sprocket
  • Ratchet dear
  • Shift carrier
  • Pinion shaft assembly
  • Disk hub
  • Slider ring assembly

Drive sprockets

Driveway marker

Just plug

Electric starter kits


  • Displacement
  • Grade
  • Power
  • Shaft size

Fan blade


  • Dual cable fitting
  • Grease fitting
  • Zerk fitting
  • Hydraulic drive fitting
  • Straight loop fitting
  • Cable z fitting
  • Fitting



Cover bottom


  • Bottom frame cover
  • Frame traction
  • Tractor frame
  • Frame assembly

Friction disc

Toro 3521 Fuel filters, lines and parts

  • Elbow fittings
  • Fuel filters
  • Fuel line
  • Fuel line fitting
  • Fuel line shut-off
  • Fuel parts
  • Hose clamp
  • In-line fuel shut-off
  • Climate bulbs
  • Shop packs

Fuel tanks

  • Fuel tank
  • Fuel tank bushing
  • Fuel tank on/off valve
  • Fuel tank strainer
  • Gas tank
  • Fuel tank nipple

Gas and oil


  • Air cleaner gasket
  • Base gasket
  • Carburettor gasket
  • Cylinder head gasket
  • Gasket set
  • Head gasket
  • Insulator gasket
  • Intake gasket
  • Muffler gasket


  • Fuel gauge assembly

Gear case

  • Housing reducer assembly
  • Cast iron gear case
  • Shaft and worm gear kit
  • Impeller shaft
  • Role him
  • Gear case assembly
  • Auger Gearbox Assembly




Headlight bulbs

Hinge pins

Hitch pins

Hose Clamps

  • Tube Clamp
  • Hose Clamp
  • Hose Wire Clamp

Hubcaps and wheel covers


Toro 3521 Ignition parts

  • breaker ignition
  • breaker points
  • condenser
  • flywheel keys
  • ignition coils
  • ignition kits
  • ignition set
  • modules
  • plunger breakers
  • voltage regulators

Ignition switches and keys

Light Kit


lubricants chemicals and oils

Lubrication systems

Maintenance kits


  • Shaft support
  • Bracket
  • Idler arm
  • Caster Leg Weldment

Mufflers and accessories

Nuts, bolts and screws

Oil Drain

  • Petcock Assembly

Oil extractor

Oil plug

Oil seals

Pinion gear

Pistons and piston rings –

  • Piston kits
  • Piston rings
  • Pistons
  • Pivot pins
  • Ring sets

Power brushes

Power cords


  • Drive pulleys
  • Engine pulleys
  • Flat idler
  • Idler pulleys
  • Pulley flat idler
  • Pulley hub
  • Blower Sheave

Push rod

Retainer ring



Rocker Arms

Role pin

Roller chain

Rubber tracks

Safety, interlock, PTO switches

  • Interlock switches
  • PTO switches
  • Toggle Switches

Scraper blades


Sheer pin

Skid shoes

Snap rings


Spark plugs and accessories – hex size, thread and type


Starter parts

  • Starter brush kits
  • Starter clubbers
  • Starter dried parts
  • Starter handles
  • Starter pawls
  • Starter pulley
  • Starter recoil assemblies
  • Starter rope
  • Starter springs



  • Steering assembly
  • Steering ball joint
  • Steering gear
  • Steering rod
  • Steering spindles

Toro 3521 Throttle and control cables

  • Auger cable
  • Brake and clutch levers
  • Chute deflector cable
  • Chute lock cable
  • Control assembly
  • Control cables
  • Controlled choke
  • Differential cable
  • Push pull controls
  • Remote wheel lock cable
  • Shift rods
  • Throttle access
  • Throttle cables
  • Throttle conduit and clips
  • Throttle controls
  • Traction cable

Tiedowns and straps

Tire chains

  • Snow Hogg two link tire chains
  • Twist link two link tire chains
  • Twist link four link tire chains



  • Gear assembly
  • Chute rotation gearbox
  • Tooth gear,


Valve stems


  • Exhaust valves
  • Intake valves
  • Valve caps
  • Valve guide

Weight kit

Wheel Accessories

Wheel hubs

Wheel rims

  • Compression wheel
  • Rim/hub assembly
  • Rim


Wiring harness

Worm gears

  • Worm gear
  • Worm shaft
  • Worm and gear service assembly
  • Worm shaft assembly
  • Worm shaft

Toro 3521 Snowblower Parts Diagram

Parts diagrams for the Toro 3521 can be found in the manual, sometimes on the main Toro website and other websites as well. They are sometimes referred to as assembly drawings.

The main assembly drawings, or parts diagrams listed for the Toro 3521 are :

Auger assembly


Drift breaker

Engine assembly new line grader blade assembly

Handle assembly


Rewind Starter

Starter Motor kit

Traction assembly

Toro 3521 Snowblower Manual

The manual gives important information about how to use the Toro 3521 snowblower.

It has a separate number of sections which focus on safety, set up, preparation, controls, usage, maintenance and warranty.

Below is a breakdown of the standard section of a Toro manual, bear in mind that these could differ depending upon the age and type of snowblower being referred to.

Toro 3521 Manual Safety Decals –

  • General advice about safety when using the snowblower

Toro 3521 Manual Setup Instructions

  • Installing handle
  • Installed traction roared
  • Install Auger drive
  • Install speed selector
  • Connect ignition wires
  • Install chute control

Toro 3521 Manual Preparation Before Starting

  • Filling with oil
  • Filling with gasoline
  • Checking snowblower operation

Toro 3521 Manual Controls

Toro 3521 Manual Starting / Stopping Engine

Toro 3521 Manual Operating Instructions

Toro 3521 Manual Maintenance

  • Draining gasoline
  • Lubricating snowblower
  • Changing outgoing gear box oil
  • Adjusting skids and scraper blade
  • Replacing Auge/impeller drive belt
  • Replacing traction drive belt
  • Replacing spark plug
  • Adjusting carburettor

Toro 3521 Manual Warranty

  • Residential Warranty
  • Commercial Warranty
  • Separate Engine Warranty

Toro 3521 Snowblower Specs

  • Swath – clearing width 21 Inch
  • Engine Type –  4 Cycle
  • Fuel Capacity – n/a
  • Discharge -Two Stage
  • Engine Size – 3.5 hp
  • Scraper – n/a
  • Tires – n/a
  • Chute Control – n/a
  • Ignition – n/a
  • Throw Distance – n/a
  • Weight n/a
  • Transmission Type – Friction Disc

Toro 3521 Snowblower Carburetor

Toro 3521 Reviews

Reviews of the Toro 3521 snowblower can be found online, in discussion forums, on Facebook groups and on You Tube.

Given the age of the snowblower, reviews will also focus on a lot of second hand snowblowers, what they are worth, how easy it is to obtain parts and whether or not it is worth upgrading to a new model.

Toro 3521 Snowblower Price

There are still a significant number of these snowblowers available to buy, either online or through local sales sites such as craigslist,

There are also a wide range of parts available, often on sites such as eBay.

The price for a second-hand or used 3521 snowblower will vary considerably, depending on the age and condition of the machine itself.

Toro 3521 Snowblower Accessories

Toro made a number of accessories for all their snowblowers, which are listed below.

It is important to check that any accessory you’re going to buy fits a particular model, such as the Toro 3521, that you have either bought or are intending to purchase.

Electric starter kit

Drift breaker kit

Light kit

Tire chain kit

Snow Cab

Tire chains

Grader Blade

Replacement Paddle Kit

Two Stage Cover

Replacement Skids









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