Toro 20339 Parts Manual

The Toro 20339 is a commercial-grade walk-behind mower designed for professional landscaping and grounds maintenance. This parts manual provides detailed information on all components, assemblies, and replacement parts for the Toro 20339 model, including engine parts, cutting deck assemblies, drive system components, controls, wheels, and accessories. Below are key sections for parts identification, ordering information, assembly diagrams, and maintenance part replacements.

Parts Identification Overview

Key component groups: Engine assembly, Cutting deck, Drive system, Control panel, Wheels and axles, Fasteners.

Component Group	Description
Engine Assembly	Includes engine block, carburetor, air filter, spark plug, fuel system parts
Cutting Deck	Deck housing, blade spindle assemblies, blades, baffles, skid shoes
Drive System	Transmission, drive belts, pulleys, tensioners, axle components
Controls & Handles	Handle assembly, control cables, levers, switches, safety components
Wheels & Axles	Front and rear wheels, axles, bearings, spacers, tire assemblies
Fasteners & Hardware	Bolts, nuts, washers, pins, clips, and specialty fasteners
Maintenance Parts	Filters, blades, belts, spark plugs, lubricants
Electrical System	Battery, wiring harness, switches, connectors, ignition components
Safety Components	Blade brake clutch, safety switches, guards, warning labels
Accessories	Baggers, mulching kits, striping kits, utility carriers

Engine Components

Detailed parts listing for the engine assembly. Reference engine model number for exact specifications.

1. Cylinder & Piston: Piston rings, connecting rod, gaskets.
2. Fuel System: Carburetor, fuel pump, fuel lines, fuel filter.
3. Ignition System: Spark plug, ignition coil, flywheel, timing components.
4. Air System: Air filter assembly, pre-cleaner, intake manifold.
5. Exhaust System: Muffler, exhaust pipe, heat shield.
6. Lubrication: Oil filter, dipstick, oil drain components.

WARNING! Always disconnect spark plug before servicing engine components. Use genuine Toro replacement parts.

Cutting Deck Assembly

Parts for the 60-inch cutting deck (model specific).

1. Deck Housing: Main deck shell, reinforcement brackets.
2. Blade Spindle Assemblies: Spindle housings, bearings, seals, shafts.
3. Cutting Blades: High-lift blades, mulching blades, blade bolts.
4. Deck Components: Baffles, discharge chute, skid shoes, rollers.
5. Deck Lift: Lift mechanism, linkages, pivot points.
6. Belt Drive: Deck drive belt, idler pulleys, tension springs.

CAUTION! Ensure blades are properly balanced and tightened to specified torque.

Drive System Parts

• Transmission: Hydrostatic transmission unit, input/output shafts.
• Drive Belts: Main drive belt, deck engagement belt.
• Pulleys: Engine pulley, transmission pulley, idler pulleys.
• Tensioners: Spring tensioners, idler arms, pivot bolts.
• Axle Components: Axle shafts, bearings, seals, retaining clips.
• Brake System: Brake pads, calipers, brake linkage.

Controls & Handles

Control system components for operation and safety.

Handle Assembly: Main handle frame, grip covers, height adjustment.

Control Cables: Throttle cable, choke cable, drive control cables.

Levers & Switches: Blade engagement lever, drive speed control, ignition switch.

Safety Components: Blade brake clutch, seat switch (if equipped), safety interlock switches.

Instrumentation: Hour meter, warning lights, indicator labels.

Wheels & Axles

Front and rear wheel assemblies.

1. Front Wheels: 13x5.00-6 tires, front wheel assemblies, bearings.
2. Rear Wheels: 20x10.00-8 tires, rear wheel assemblies, axle components.
3. Axles: Front axle assembly, rear axle assembly, spindle bolts.
4. Bearings & Seals: Wheel bearings, bearing seals, grease fittings.
5. Tire Components: Valve stems, tire tubes, wheel weights.

Tip: Check tire pressure regularly and inspect bearings for wear.

Fasteners & Hardware

All bolts, nuts, washers, and specialty fasteners.

1. Bolts: Hex bolts, carriage bolts, shoulder bolts.
2. Nuts: Hex nuts, lock nuts, flange nuts.
3. Washers: Flat washers, lock washers, shoulder washers.
4. Pins & Clips: Cotter pins, hitch pins, retaining clips.
5. Specialty Fasteners: Blade bolts, spindle nuts, deck mounting hardware.
6. Threaded Inserts: Helicoils, weld nuts, threaded brackets.

WARNING! Use only grade-specified fasteners. Replace damaged fasteners immediately.

Maintenance Parts

Common replacement parts for routine maintenance.

Part Type	Part Number	Replacement Interval
Air Filter	TORO-20339-AF	Every 100 hours
Oil Filter	TORO-20339-OF	Every 100 hours
Spark Plug	TORO-20339-SP	Every 200 hours
Cutting Blades	TORO-20339-CB	Every 50 hours (sharpen)
Drive Belt	TORO-20339-DB	Every 300 hours
Deck Belt	TORO-20339-DKB	Every 300 hours
Fuel Filter	TORO-20339-FF	Every 200 hours
Hydraulic Fluid	TORO-HYDR-1GAL	Every 400 hours
Grease Cartridge	TORO-GREASE-14OZ	As needed
Battery	TORO-20339-BAT	Every 2-3 years

Assembly Diagrams

Reference diagrams for major assemblies. Diagrams show part relationships and locations.

Engine Assembly Diagram: Shows all engine components with callouts.

Cutting Deck Exploded View: Illustrates deck housing, spindles, blades, and hardware.

Drive System Schematic: Details transmission, belts, pulleys, and tensioners.

Control Panel Layout: Shows handle assembly, cables, and switches.

Wheel & Axle Assembly: Illustrates wheel mounting and axle components.

Note: Diagrams are for reference only. Always consult service manual for detailed assembly instructions.

Ordering Information

How to order genuine Toro parts for the 20339 model.

1. Identify Part: Use part number from this manual or diagram callout.
2. Contact Dealer: Provide model number (20339) and part number.
3. Online Ordering: Visit toro.com/parts, enter model number.
4. Verify Compatibility: Confirm part matches your serial number range.
5. Shipping: Standard and expedited options available.
6. Returns: Unused parts in original packaging within 30 days.

Support: For parts assistance, contact 1-800-348-2424 or visit toro.com.

Troubleshooting Parts Issues

Symptom	Possible Cause	Corrective Action
Part doesn't fit	Wrong part number	Verify model and serial number; order correct part.
Part missing from order	Shipping error	Contact dealer with order number; request missing part.
Part damaged	Shipping damage	Document damage; contact dealer for replacement.
Part wears quickly	Installation error or incompatible part	Verify installation procedure; ensure genuine Toro part.
Cannot identify part	Diagram unclear	Contact Toro technical support with diagram reference.
Part discontinued	Obsolete part	Check for superseded part number; consult dealer for alternatives.

Note: Always use genuine Toro parts to maintain warranty and performance.

Service: 1-800-348-2424; www.toro.com