Murray MYZ4219000 Lawn Mower Manual

The Murray MYZ4219000 is a 21-inch self-propelled gas lawn mower featuring a Briggs & Stratton 190cc engine, 3-in-1 mulching/bagging/side-discharge capability, single-lever height adjustment (6 positions: 1.25"-3.75"), rear-wheel drive, easy-start system, durable steel deck, and large-capacity grass bag. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly Instructions 3. Safety Precautions 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: Briggs & Stratton 190cc engine, 21-inch steel cutting deck, Rear-wheel self-propulsion system, Single-lever height adjustment, 3-in-1 mulch/bag/side-discharge system, Large-capacity grass bag, Easy-start primer bulb.

Feature	Description
Engine	Briggs & Stratton 190cc, 4-cycle, OHV
Cutting Width	21 inches
Cutting Height	6 positions (1.25" to 3.75")
Drive System	Rear-wheel self-propelled
Deck Material	Durable steel construction
Grass Bag Capacity	2.1 bushels
Starting System	Recoil start with primer bulb
Fuel Tank Capacity	0.95 quarts
Wheel Size	8-inch rear, 7-inch front
Weight	Approximately 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, secure with provided hardware.
Attach grass bag: Hook bag frame onto rear deck brackets, ensure secure fit.
Install side-discharge chute: Attach to discharge opening on right side.
Add engine oil: Fill with SAE 30 detergent oil (18 oz. capacity).
Add gasoline: Use fresh unleaded gasoline (87 octane minimum).

WARNING! Never add gasoline while engine is running or hot. Ensure all bolts are tightened securely.

Safety Precautions

Always follow safety guidelines to prevent injury.

Read manual completely before operation.
Clear mowing area of stones, toys, and debris.
Wear sturdy shoes, long pants, and eye protection.
Never mow wet grass or in poor visibility.
Keep children and pets away from mowing area.
Disconnect spark plug wire before performing maintenance.
Use both hands on handle; walk, never run.

DANGER! Blade rotates at high speed; keep hands and feet away from deck. Never operate without grass bag or discharge chute properly installed.

Specifications

Model: MYZ4219000
Engine: Briggs & Stratton 190cc, 4-cycle
Cutting Width: 21 inches
Cutting Height Range: 1.25" - 3.75" (6 positions)
Self-Propelled Drive: Rear-wheel drive with single speed control
Deck Construction: 20-gauge steel
Grass Bag Capacity: 2.1 bushels
Fuel Type: Unleaded gasoline (87 octane minimum)
Oil Type: SAE 30 detergent oil (18 oz. capacity)
Warranty: 2-year limited warranty

Controls and Operation

Handle Controls: Drive control lever, Height adjustment lever, Engine throttle control, Recoil starter grip.

Starting Procedure:

Check oil and fuel levels.
Push primer bulb 3 times (cold engine).
Set throttle to FAST position.
Pull recoil starter firmly.

Self-Propelled Operation: Squeeze drive control lever to handle to engage drive. Release to stop. Adjust speed with throttle control.

Stopping: Release drive lever, move throttle to STOP, wait for blade to stop completely.

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 in position.

Height Positions: 1 (1.25"), 2 (1.75"), 3 (2.25"), 4 (2.75"), 5 (3.25"), 6 (3.75")

Tip: For first mow of season, set to highest position. Never remove more than 1/3 of grass blade length.

3-in-1 Function Setup

Configure for mulching, bagging, or side discharge.

Mulching: Install mulch plug (included). Grass is cut finely and returned to lawn as fertilizer.
Bagging: Attach grass bag to rear brackets. Collects clippings for disposal.
Side Discharge: Install discharge chute on right side. Ejects clippings to side.

WARNING! Always operate with one of three configurations installed. Never operate without proper attachment.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Maintenance Task	Frequency
Check engine oil level	Before each use
Clean underside of deck	After each use
Check blade sharpness	Every 25 hours
Replace air filter	Every season or 25 hours
Change engine oil	First 5 hours, then every 50 hours
Replace spark plug	Every 100 hours
Lubricate wheels and height adjuster	Every 25 hours

CAUTION! Always disconnect spark plug wire before performing maintenance.

Storage Guidelines

Proper storage prevents damage and extends mower life.

Drain fuel tank or add fuel stabilizer for long-term storage.
Run engine until it stops to clear carburetor.
Change engine oil at end of season.
Clean entire mower, especially underside of deck.
Store in dry, covered area away from moisture.
Remove spark plug and add 1 oz. oil to cylinder; pull starter slowly to distribute.

Important: Never store with gasoline in tank for more than 30 days without stabilizer.

Warranty Information

Murray MYZ4219000 includes 2-year limited warranty covering defects in materials and workmanship. Warranty does not cover normal wear, improper maintenance, accident, or commercial use. Proof of purchase required. For warranty service, contact authorized service center or call 1-800-800-7310. Keep this manual and receipt for warranty claims.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, clogged air filter, old gasoline	Check fuel level; clean/replace air filter; use fresh gasoline.
Engine runs poorly	Dirty spark plug, old gasoline	Clean or replace spark plug; drain old gasoline.
Uneven cutting	Dull blade, uneven tire pressure	Sharpen or replace blade; check tire pressure.
Self-propelled not working	Drive belt loose or worn	Check drive belt tension; replace if worn.
Excessive vibration	Loose blade, bent blade	Tighten blade bolt; replace bent blade.
Grass not discharging	Wet grass, clogged deck	Wait for grass to dry; clean underside of deck.

Service: For repairs not covered in manual, contact authorized service center at 1-800-800-7310 or visit www.murray.com