Toro Lawn Mower Model 20339 Owner's Manual

The Toro Model 20339 is a 22-inch self-propelled gas lawn mower featuring a 190cc Briggs & Stratton engine, 3-in-1 mulching/bagging/side-discharge capability, single-lever height adjustment (1.5-4 inches), electric start, rear-wheel drive, and a 2.5-bushel grass bag. This manual covers safety, assembly, operation, maintenance, troubleshooting, and storage procedures to ensure optimal performance and longevity of your mower.

1. Features at a Glance 2. Assembly Instructions 3. Safety Information 4. Specifications 5. Controls and Operation 6. Starting & Stopping 7. Cutting & Discharge Options 8. Maintenance Schedule 9. Storage & Winterization 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: 190cc engine, 22-inch steel deck, rear grass bag, height adjustment lever, electric start key, drive control bar, and fuel tank.

Feature	Description
Engine	190cc Briggs & Stratton, 4-cycle, OHV
Cutting Width	22 inches
Cutting Height	1.5 to 4 inches (7 positions)
Drive System	Self-propelled, rear-wheel drive
Start System	Electric start with key (battery included)
Discharge Options	Mulch, Bag, Side-discharge (3-in-1)
Grass Bag Capacity	2.5 bushels
Fuel Tank Capacity	0.95 gallons
Wheels	10-inch rear, 8-inch front
Weight	Approx. 85 lbs

Assembly Instructions

Unpack all parts from the box. Assembly requires basic tools (included).

Attach the handle: Align lower handle with deck brackets, secure with provided bolts and wing nuts.
Install the grass bag: Hook bag onto rear deck brackets; ensure it clicks into place.
Connect the battery: For electric start, connect red (+) then black (-) terminals to battery.
Add oil and fuel: Fill engine with SAE 30 oil (check dipstick). Add unleaded gasoline (87 octane minimum).
Install side-discharge chute (if not mulching): Attach to deck opening with retaining pin.

WARNING! Do not add fuel during assembly or near open flames. Ensure all fasteners are tight.

Safety Information

Read all instructions before operation. Always wear sturdy shoes and eye protection.

Clear mowing area of stones, toys, and debris.
Never mow wet grass or in poor visibility.
Do not allow children or pets in area during mowing.
Disconnect spark plug wire before performing any maintenance.
Use both hands on handle; walk, never run, behind mower.
Do not tip mower on its side while engine is running or hot.

DANGER! Rotating blade can cause severe injury. Keep hands and feet away from deck at all times.

Specifications

Model: 20339
Engine: Briggs & Stratton 190cc, 4-cycle
Cutting Width: 22 inches
Cutting Height Range: 1.5 - 4 inches
Drive: Self-propelled, single-speed rear-wheel
Start Type: Electric (key) with backup recoil
Discharge: Mulch, Bag, Side-discharge
Bag Capacity: 2.5 bushels
Fuel: Unleaded gasoline (87 octane or higher)
Oil Type: SAE 30 (summer), 5W-30 (winter)
Warranty: 3-year limited

Controls and Operation

Handle Controls: Drive control bar (squeeze to engage drive), Height adjustment lever, Electric start key slot, Throttle control, Recoil starter handle.

Operation: Set height, choose discharge option, start engine, squeeze drive bar to move. Release drive bar to stop movement; engine continues running.

Height Adjustment: Move lever to one of 7 positions (1=lowest, 7=highest). Ensure all wheels are at same setting.

Starting & Stopping

Electric Start (recommended):

Check oil and fuel levels.
Insert key into ignition slot.
Set throttle to FAST position.
Turn key clockwise; release when engine starts.

Recoil Start (backup):

Follow steps 1-3 above.
Pull recoil starter handle briskly.

Stopping:

Release drive control bar.
Move throttle to STOP position.
Remove key (electric start models).
Wait for all moving parts to stop before leaving mower.

Tip: For cold starts, use choke (if equipped) by pulling choke knob out before starting.

Cutting & Discharge Options

3-in-1 System: Configure based on grass conditions.

Mulching: Install mulch plug (closes discharge opening). Cuts clippings finely and returns them to lawn.
Bagging: Attach grass bag. Collects clippings for disposal.
Side-discharge: Install discharge chute. Directs clippings to side (right).

Cutting Tips: Mow when grass is dry. Overlap passes by 2 inches. Change pattern weekly to avoid ruts. Never remove more than 1/3 of grass height at one time.

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

Maintenance Schedule

Interval	Task
Before each use	Check oil level; inspect blade for damage; clear deck of debris
Every 25 hours	Change oil (first change after 5 hours); check air filter; sharpen blade
Every 50 hours	Replace air filter; check spark plug; lubricate wheels and height adjuster
Every 100 hours	Replace spark plug; check drive belt tension
Seasonally	Clean underside of deck; inspect for worn parts

Blade Sharpening: Remove blade (mark orientation first). Use file or grinder to sharpen at original angle (typically 30°). Balance blade before reinstalling.

Storage & Winterization

End-of-season preparation prevents fuel system damage.

Run engine to warm oil, then drain and refill with fresh oil.
Add fuel stabilizer to tank, run engine for 5 minutes to circulate.
Either: (a) Run engine until fuel tank is empty, OR (b) Fill tank completely to prevent condensation.
Clean entire mower, especially underside of deck.
Remove spark plug, add 1 tablespoon of oil to cylinder, pull starter cord slowly to distribute, reinstall plug.
Store in dry, covered area. Protect from moisture.

CAUTION! Never store mower with fuel in tank in enclosed area near open flame or pilot lights.

Warranty Information

Toro Model 20339 includes a 3-year limited warranty covering defects in materials or workmanship when used for normal residential purposes. Warranty does not cover damage from misuse, neglect, commercial use, or improper maintenance. Proof of purchase required. For warranty service, contact an authorized Toro service dealer or call 1-888-384-9939. Register your product online at www.toro.com for faster service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Empty fuel tank; old gasoline; clogged air filter; spark plug issue	Add fresh fuel; replace air filter; check/replace spark plug; ensure key is inserted (electric start)
Engine runs poorly	Dirty air filter; water in fuel; clogged carburetor	Clean/replace air filter; drain fuel tank and refill with fresh gasoline
Mower vibrates excessively	Damaged or unbalanced blade; loose parts	Stop engine immediately. Check blade for damage, sharpen/balance or replace; tighten all bolts
Self-propel not working	Drive belt worn or broken; drive control cable loose	Inspect drive belt; adjust or replace if necessary; check cable tension
Uneven cutting	Dull blade; uneven tire pressure; deck clogged	Sharpen blade; check tire pressure (12 PSI recommended); clean deck underside
Grass not discharging properly	Wet grass; deck clogged; incorrect height setting	Mow when grass is dry; clean deck; raise cutting height

For Service: Contact authorized Toro dealer or 1-888-384-9939. Always provide model number (20339).