Murray 309003x99NA Lawn Mower Manual

The Murray 309003x99NA is a 22-inch push lawn mower featuring a 159cc Briggs & Stratton engine, 3-in-1 mulching/bagging/side discharge capability, single-lever height adjustment (1.5-3.75 inches), durable steel deck, easy-start system, and rear-wheel drive. Designed for residential lawns up to 1/2 acre. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly Instructions 3. Safety Information 4. Specifications 5. Controls and Operation 6. Cutting Height Adjustment 7. 3-in-1 Function Setup 8. Maintenance Schedule 9. Storage Guidelines 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: 159cc Briggs & Stratton engine, 22-inch steel cutting deck, rear bagger, mulching plug, side discharge chute, single-lever height adjuster, 8-inch rear wheels, 7-inch front wheels.

Feature	Description
Engine	159cc Briggs & Stratton 450E series, OHV
Cutting Width	22 inches
Cutting Height	1.5 to 3.75 inches (6 positions)
Drive System	Rear-wheel drive, manual push
Deck Material	Powder-coated steel
3-in-1 Function	Mulch, Bag, Side Discharge
Wheels	8-inch rear, 7-inch front
Starter	Recoil with Easy-Spin™ technology
Fuel Tank	1.1 quart capacity
Weight	Approx. 65 lbs

Assembly Instructions

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

Attach handle: Align lower handle with deck brackets, secure with bolts and wing nuts.
Install upper handle: Connect to lower handle, tighten knobs.
Attach grass bag: Hook bag frame onto rear deck brackets, ensure secure latch.
Install side discharge chute: Snap into place on right side of deck.
Add engine oil: Fill with SAE 30 detergent oil (20 oz. capacity).
Add gasoline: Use fresh unleaded gasoline (87 octane or higher).

WARNING! Keep hands and feet clear of cutting blade during assembly. Ensure all fasteners are tight.

Safety Information

Read all instructions before operation. Always wear protective gear.

Clear mowing area: Remove stones, toys, and debris.
Check fuel: Fill outdoors, away from ignition sources.
Start engine: Stand behind mower, pull starter cord firmly.
Mow in daylight: Ensure good visibility.
Stop engine: Release blade control lever, wait for blade to stop.

DANGER! Never operate without grass bag, mulching plug, or discharge chute properly installed. Keep children and pets away.

Specifications

Model: Murray 309003x99NA
Engine: Briggs & Stratton 450E, 159cc, OHV
Cutting Width: 22 inches
Cutting Height Range: 1.5 - 3.75 inches
Deck: 22-inch steel, powder-coated
Wheels: 8-inch rear, 7-inch front
Drive: Manual push, rear-wheel
Fuel: Unleaded gasoline (87 octane min.)
Oil: SAE 30 detergent (20 oz. capacity)
Warranty: 2-year limited

Controls and Operation

Handle controls: Blade control lever (must be held to engage blade), throttle control, height adjustment lever.

Starting: 1. Check oil and fuel. 2. Push primer bulb 3 times. 3. Set throttle to FAST. 4. Hold blade control lever against handle. 5. Pull starter cord.

Stopping: Release blade control lever. Engine and blade will stop.

Operation Tips: Mow when grass is dry. Overlap passes by 2 inches. Change mowing pattern weekly.

Cutting Height Adjustment

Single-lever adjustment for all four wheels.

Stop engine and wait for blade to stop.
Pull height adjustment lever toward wheel.
Move lever to desired position (1-6).
Release lever to lock.

Height Settings: 1 (1.5"), 2 (2"), 3 (2.5"), 4 (2.75"), 5 (3.25"), 6 (3.75").

Tip: For first mow of season, set to highest position. Never cut more than 1/3 of grass height at once.

3-in-1 Function Setup

Configure for mulching, bagging, or side discharge.

Mulching: Install mulching plug in rear discharge opening. Grass is cut finely and returned to lawn.
Bagging: Remove mulching plug, attach grass bag to rear brackets.
Side Discharge: Remove mulching plug and bag, install side discharge chute.

WARNING! Always use one of the three configurations. Never operate with openings uncovered.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

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
Every season	Sharpen or replace blade, check spark plug
As needed	Clean underside of deck, check wheel bolts

CAUTION! Disconnect spark plug wire before performing any maintenance.

Storage Guidelines

Prepare mower for off-season storage.

Drain fuel tank or add fuel stabilizer.
Change engine oil.
Clean entire mower, especially underside.
Remove spark plug, add 1 tablespoon oil to cylinder, pull starter slowly.
Store in dry, covered area.

Tip: Store with height adjustment at highest setting to relieve spring tension.

Warranty Information

Murray 309003x99NA includes a 2-year limited warranty covering defects in materials and workmanship. Warranty does not cover normal wear, misuse, or lack of maintenance. Proof of purchase required. For warranty service, contact Murray customer service at 1-800-800-7310 or visit www.murray.com. Keep this manual for reference.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gas, clogged air filter	Add fresh fuel, clean/replace air filter, check spark plug.
Poor cutting performance	Dull blade, low engine speed	Sharpen/replace blade, set throttle to FAST.
Uneven cut	Uneven tire pressure, wrong height setting	Check tire pressure, adjust cutting height evenly.
Excessive vibration	Damaged or unbalanced blade	Stop engine, inspect blade for damage, replace if needed.
Grass not discharging	Wet grass, clogged deck	Mow when grass is dry, clean underside of deck.

Service: For technical support, call 1-800-800-7310 or visit www.murray.com.