Murray 405005x99B Lawn Mower Manual

The Murray 405005x99B is a 21-inch push lawn mower featuring a 4-cycle Briggs & Stratton engine, 3-in-1 mulching/bagging/side discharge capability, single-lever height adjustment, easy-start system, durable steel deck, and rear-wheel drive. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 4-cycle Briggs & Stratton engine, 21-inch steel cutting deck, rear bagger, mulching plug, side discharge chute, single-lever height adjustment, rear-wheel drive system.

Assembly Instructions

Unpack and inspect all parts. Assemble on a flat, clear surface.

1. Attach handle: Insert lower handle into deck brackets, secure with provided bolts and wing nuts.
2. Install wheels: Slide wheels onto axles, secure with push nuts or washers and cotter pins.
3. Attach grass bag: Hook bag frame onto rear deck brackets, ensure secure latch.
4. Install side discharge chute: Attach to deck opening with provided hardware.
5. Add mulching plug: Insert into rear discharge opening when mulching.
6. Check oil: Engine is shipped without oil; add SAE 30 motor oil to full mark on dipstick.

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

First-Time Setup

Prepare mower for first use.

1. Add fuel: Use fresh unleaded gasoline (87 octane minimum). Do not overfill.
2. Check oil level: Ensure oil is at full mark on dipstick.
3. Adjust cutting height: Set single lever to desired position (middle setting recommended for first mow).
4. Select discharge mode: Install bag, mulching plug, or side chute as needed.
5. Start engine: Pull recoil starter firmly after engaging blade control lever.

CAUTION! Never add fuel while engine is hot. Allow to cool for at least 5 minutes.

Specifications

• Model: Murray 405005x99B
• Engine: Briggs & Stratton 4-cycle, 140cc
• Cutting Width: 21 inches
• Cutting Height: 1.5 - 3.75 inches (6 positions)
• Deck Material: Powder-coated steel
• Wheels: 8-inch rear, 7-inch front
• Fuel Capacity: 0.5 gallons
• Oil Capacity: 20 oz (SAE 30)
• Weight: 55 lbs (assembled)
• Warranty: 2-year limited

Controls and Operation

Main controls: Blade control lever, throttle control, drive control bar, height adjustment lever.

Starting: 1. Push primer bulb 3 times (cold engine). 2. Set throttle to FAST. 3. Hold blade control lever against handle. 4. Pull recoil starter firmly.

Stopping: Release blade control lever. Engine and blade will stop within 3 seconds.

Height Adjustment: Move single lever to one of 6 positions. All wheels adjust simultaneously.

Drive Control: Squeeze drive control bar against handle to engage rear-wheel drive.

Cutting & Discharge Options

3-in-1 capability: Bagging, Mulching, Side Discharge.

1. Bagging: Install grass bag on rear deck. Ideal for collecting clippings.
2. Mulching: Install mulching plug in rear opening. Cuts clippings finely and returns to lawn.
3. Side Discharge: Attach side discharge chute. For cutting tall or wet grass.

Tip: For best mulching, mow when grass is dry and cut no more than 1/3 of blade height.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Blade Sharpening: Remove blade, sharpen at original angle (balance after sharpening).

Storage Instructions

Proper storage prevents corrosion and starting issues.

1. Clean mower thoroughly, removing all grass and debris.
2. Drain fuel tank or add fuel stabilizer and run engine for 2 minutes.
3. Change oil if near service interval.
4. Remove spark plug, add 1 tablespoon of oil to cylinder, pull starter slowly to coat.
5. Store in clean, dry location, preferably covered.

CAUTION! Never store with fuel in tank for more than 30 days without stabilizer.

Safety Information

READ BEFORE OPERATING:

• Always wear sturdy shoes and eye protection.
• Clear mowing area of stones, sticks, and other objects.
• Never mow wet grass.
• Do not allow children or pets in area during operation.
• Disconnect spark plug wire before performing any maintenance.
• Never remove grass bag or unclog chute while engine is running.
• Use extreme caution when mowing on slopes.

DANGER! Rotating blade can cause severe injury. Always keep hands and feet away.

Warranty & Support

Murray 405005x99B comes with a 2-year limited warranty covering defects in materials and 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: 1-800-800-7310 (Murray Products) or visit www.murray.com

Parts: Genuine Murray replacement parts available through authorized dealers.

Troubleshooting

Reset: For safety interlock issues, ensure blade control lever is fully engaged.

Service: 1-800-800-7310; www.murray.com