Murray 425303x92B Lawn Mower Manual

The Murray 425303x92B is a 21-inch push lawn mower featuring a 190cc Briggs & Stratton engine, 3-in-1 mulching/bagging/side discharge capability, single-lever height adjustment, durable steel deck, easy-start system, and rear bagger. This manual covers safety, assembly, operation, maintenance, troubleshooting, and specifications for optimal performance and longevity.

Features at a Glance

Key components: 190cc Briggs & Stratton engine, 21-inch steel cutting deck, 3-in-1 function, rear grass bag, single-lever height adjuster, push handle with controls.

Assembly Instructions

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

1. Attach handle: Align lower handle sections with deck brackets, secure with bolts and wing nuts.
2. Install upper handle: Connect to lower handle, secure with provided hardware.
3. Attach grass bag: Hook bag frame onto rear deck brackets; ensure secure attachment.
4. Install side discharge chute (if not pre-installed): Snap into place on deck opening.
5. Check wheel installation: Ensure all wheels are securely fastened and rotate freely.
6. Add engine oil: Use SAE 30 detergent oil (approx. 20 oz) as specified in engine manual.
7. Add gasoline: Use fresh unleaded gasoline (87 octane minimum).

WARNING! Wear gloves during assembly. Ensure all fasteners are tight before operation.

First-Time Setup

Before first use, complete pre-operation checks.

1. Check oil level: Ensure oil is at full mark on dipstick; add if necessary.
2. Fuel: Fill tank with fresh unleaded gasoline; avoid overfilling.
3. Inspect blade: Ensure cutting blade is sharp, undamaged, and securely fastened.
4. Adjust cutting height: Set lever to desired height (middle position recommended for first mow).
5. Test controls: Verify throttle control, blade engagement lever, and safety handle operate smoothly.
6. Start engine: Follow starting procedure in engine manual; allow warm-up.

CAUTION! Operate only in well-ventilated outdoor areas. Keep clear of bystanders.

Specifications

• Model: Murray 425303x92B
• Engine: Briggs & Stratton 190cc, 4-cycle OHV
• Cutting Width: 21 inches
• Cutting Height Range: 1.5 - 3.75 inches (6 positions)
• Deck Material: Powder-coated steel
• Grass Bag Capacity: 2.0 bushels
• Wheels: 8-inch rear, 7-inch front
• Fuel Tank Capacity: 1.0 quart
• Oil Capacity: 20 oz (SAE 30)
• Weight: 65 lbs (approx.)
• Warranty: 2-year limited

Controls and Operation

Handle Controls: Throttle lever, blade engagement lever, safety handle.

Starting Procedure:

1. Check oil and fuel levels.
2. Move throttle lever to FAST position.
3. Prime engine (if equipped) by pressing primer bulb 3 times.
4. Pull recoil starter cord firmly until engine starts.
5. Allow engine to warm up for 30 seconds.

Operating: To mow, depress safety handle against handlebar and engage blade lever. Release to stop blade. Always walk, never run, behind mower.

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

Cutting Height Adjustment

Single-lever adjustment changes height for all four wheels simultaneously.

1. Stop engine and wait for blade to stop.
2. Locate adjustment lever on left side of deck.
3. Pull lever outward and move to desired position (1-6).
4. Release lever to lock into position.
5. Verify all wheels are at same height by checking deck clearance.

Tip: For first mow of season, set to highest setting; gradually lower for subsequent mows.

Maintenance Schedule

Regular maintenance ensures optimal performance and extends mower life.

Blade Sharpening: Disconnect spark plug wire. Remove blade; sharpen at original angle (balance after sharpening).

Storage Guidelines

Proper storage prevents fuel system issues and corrosion.

1. Run engine to use up remaining fuel OR add fuel stabilizer to tank and run for 2 minutes.
2. Change oil if near service interval.
3. Clean mower thoroughly, especially underside of deck.
4. Remove spark plug, add 1 tablespoon of oil to cylinder, pull starter cord slowly to distribute.
5. Store in dry, covered area; cover mower to keep dust-free.

CAUTION! Never store mower with gasoline in tank indoors or near open flame.

Safety Information

Read and understand all safety instructions before operation.

• Always wear sturdy shoes and eye protection.
• Clear mowing area of stones, sticks, and other objects.
• Never mow wet grass; reduced traction increases slip risk.
• Do not allow children to operate mower; keep bystanders away.
• Disconnect spark plug wire before performing any maintenance.
• Never reach under deck while engine is running.
• Use extreme caution when mowing on slopes; mow across slope, not up/down.
• Stop engine and wait for blade to stop before crossing gravel drives or roads.

WARNING! Failure to follow safety instructions can result in serious injury or death.

Warranty & Support

Murray 425303x92B includes a 2-year limited warranty covering defects in materials/workmanship. Warranty does not cover normal wear, misuse, or lack of maintenance. For warranty service, contact authorized service center with proof of purchase.

Customer Support: 1-800-XXX-XXXX (Murray Products) or visit www.murray.com. Engine-related issues: Contact Briggs & Stratton at 1-800-XXX-XXXX or www.briggsandstratton.com.

Troubleshooting

Reset: For engine with safety features, ensure all controls are in proper position.

Service: For repairs beyond basic maintenance, contact authorized service center.