Toro Lawn Mower 20339 Manual

The Toro 20339 is a high-performance, self-propelled gas lawn mower featuring a powerful engine, adjustable cutting heights, a durable steel deck, rear-wheel drive, and a versatile mulching/bagging/side-discharge system. Designed for residential use, it offers easy starting, ergonomic controls, and reliable cutting performance. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly & Setup 3. Controls & Operation 4. Specifications 5. Cutting & Height Adjustment 6. Mulching, Bagging & Discharge 7. Maintenance Schedule 8. Storage & Winterization 10. Safety Information 11. Warranty & Support 12. Troubleshooting

Features at a Glance

Key components: Steel cutting deck, Briggs & Stratton engine, rear-wheel drive system, height adjustment lever, mulching plug, grass bag, and control handle.

Feature	Description
Engine	Briggs & Stratton 140cc OHV engine with easy-start system
Cutting Width	21-inch steel cutting deck
Drive System	Self-propelled rear-wheel drive with variable speed control
Height Adjustment	Single-lever adjustment for 6 cutting positions (1.5" - 4")
Cutting Options	Mulch, bag, or side-discharge capability
Grass Bag	2.5 bushel rear bag with easy-empty feature
Handle	Ergonomic folding handle with cushioned grips
Wheels	8-inch rear wheels, 7-inch front wheels
Starter	Recoil pull-start mechanism
Fuel Tank	0.75-gallon capacity

Assembly & Setup

Unpack and inspect all parts. Assembly requires basic tools (included).

Attach handle: Secure upper and lower handle sections with provided bolts and knobs.
Install grass bag: Attach bag support frame to deck, then hook bag onto frame.
Install mulching plug: If mulching, insert plug into discharge chute.
Add oil and fuel: Fill engine with SAE 30 oil (check dipstick). Add fresh unleaded gasoline (87 octane minimum).
Check tire pressure: Inflate to 15 PSI if necessary.

WARNING! Always assemble on a flat, stable surface. Keep hands clear of cutting blade during assembly.

Controls & Operation

Familiarize yourself with all controls before starting.

Starting: Set throttle to FAST, prime engine (if cold), pull recoil starter firmly.
Self-propelled drive: Squeeze drive control lever on handle to engage wheels; release to stop.
Speed adjustment: Use variable speed control dial on handle.
Cutting height: Adjust lever to desired setting before starting mower.
Stopping: Release drive lever, move throttle to STOP, wait for blade to stop completely.

CAUTION! Never operate without proper safety gear. Keep feet and hands away from discharge area.

Specifications

Model: Toro 20339
Engine: Briggs & Stratton 140cc, 4-cycle OHV
Cutting Width: 21 inches
Cutting Heights: 1.5" to 4" (6 positions)
Drive: Self-propelled rear-wheel drive
Speed Settings: Variable (0-3.5 mph)
Bag Capacity: 2.5 bushels
Deck Material: Powder-coated steel
Warranty: 2-year limited
Weight: 65 lbs (approx.)

Cutting & Height Adjustment

Proper cutting height promotes healthy grass.

Adjustment: Move single lever to one of 6 positions. Lower numbers = shorter cut. For best results, never cut more than 1/3 of grass blade length at once.

Cutting Patterns: Overlap each pass by 2-3 inches. Change direction weekly to prevent ruts.

Tip: Cut when grass is dry for best results and to prevent clogging.

Mulching, Bagging & Discharge

Configure mower for your preferred method.

Mulching: Install mulching plug. Cuts clippings finely and returns them to lawn as fertilizer.
Bagging: Attach grass bag. Collects clippings for disposal.
Side Discharge: Remove both plug and bag. Discharges clippings to side (use with optional side discharge deflector).

WARNING! Always stop engine and disconnect spark plug before changing configuration.

Maintenance Schedule

Regular maintenance ensures long life and optimal performance.

Interval	Task
Before each use	Check oil level, inspect blade for damage, clear deck of debris
Every 25 hours	Change engine oil, clean/replace air filter, check spark plug
Every season	Sharpen or replace blade, lubricate wheel axles and height adjuster
As needed	Clean underside of deck, check tire pressure, inspect drive belt

Storage & Winterization

Proper storage prevents fuel system issues.

Add fuel stabilizer to tank and run engine for 5 minutes.
Drain or run tank dry (optional).
Change oil and clean air filter.
Remove spark plug, add 1 teaspoon of oil to cylinder, pull starter slowly, reinstall plug.
Clean entire mower, store in dry place.

CAUTION! Store fuel in approved container away from heat sources.

Safety Information

Always follow safety guidelines to prevent injury.

Wear sturdy shoes, eye protection, and long pants.
Clear mowing area of stones, toys, and debris.
Never mow wet grass or on steep slopes.
Disconnect spark plug before performing any maintenance.
Keep children and pets away from mowing area.
Never leave mower unattended while running.

Warranty & Support

Toro 20339 includes a 2-year limited warranty for residential use. Register product online at www.toro.com. For technical support, contact Toro Customer Service at 1-888-384-9939 or visit support.toro.com. Keep original receipt for warranty claims.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gas, clogged filter	Check fuel level; use fresh gas; clean/replace air filter; check spark plug.
Poor cutting performance	Dull blade, low engine speed	Sharpen/replace blade; set throttle to FAST; clear deck buildup.
Mower vibrates excessively	Damaged/unbalanced blade	Stop engine immediately; inspect and replace blade if bent or damaged.
Self-propelled drive not working	Drive cable loose, belt worn	Adjust drive cable tension; inspect and replace drive belt if necessary.
Grass bag not filling	Deck clogged, wet grass	Clean underside of deck; mow when grass is dry; check bag for blockages.

Service: For repairs, contact authorized Toro service center. Use only genuine Toro parts.