Murray 425002x99A Lawn Mower Manual

The Murray 425002x99A is a walk-behind, self-propelled gasoline lawn mower featuring a Briggs & Stratton engine, 21-inch steel cutting deck, 3-in-1 cutting system (mulch/bag/side discharge), single-lever height adjustment, rear-wheel drive, and easy-start technology. This manual covers safety, assembly, operation, maintenance, troubleshooting, and specifications for optimal performance and longevity.

Features at a Glance

Key components: Briggs & Stratton engine, 21-inch steel deck, rear bagger, height adjustment lever, self-propelled drive system, recoil starter.

Assembly Instructions

Unpack all parts from box. Verify contents against parts list.

1. Attach handle: Align lower handle with deck brackets, secure with provided bolts and washers.
2. Install upper handle: Connect to lower handle, tighten knobs or bolts.
3. Attach grass bag: Slide bag frame onto rear deck hooks; ensure secure fit.
4. Install side discharge chute (if not mulching): Attach to deck opening.
5. Check wheels: Ensure all wheels are properly seated and secured.
6. Add engine oil: Use SAE 30 detergent oil (approx. 20 oz) – check dipstick.
7. Add gasoline: Use fresh unleaded gasoline (87 octane minimum).

WARNING! Wear gloves during assembly. Keep hands clear of cutting blade. Do not add gasoline indoors or near sparks.

First-Time Setup & Operation

Before first use, complete assembly and perform pre-operation checks.

1. Check oil level: Ensure oil is at full mark on dipstick.
2. Fill fuel tank: Use fresh unleaded gasoline.
3. Adjust cutting height: Set lever to desired position (start at 2.5-3 inches).
4. Start engine: Set throttle to FAST, pull recoil starter firmly.
5. Engage self-propelled drive: Squeeze drive control lever to rear handle.
6. Begin mowing: Walk at steady pace, overlapping passes slightly.
7. Stop engine: Release blade control lever and move throttle to STOP.

CAUTION! Clear mowing area of debris. Never operate without grass bag or discharge chute properly installed.

Specifications

• Model: Murray 425002x99A
• Engine: Briggs & Stratton 125cc, 4-cycle, OHV
• Cutting Width: 21 inches
• Cutting Height: 1 to 3.5 inches (6 positions)
• Drive: Rear-wheel self-propelled, variable speed
• Fuel Type: Unleaded gasoline (87 octane minimum)
• Fuel Capacity: 0.5 gallons
• Oil Type: SAE 30 detergent (20 oz capacity)
• Deck Material: Steel
• Warranty: 2-year limited

Controls and Adjustments

Main controls located on handle: Blade control lever, drive control lever, throttle control, height adjustment lever.

Blade Control Lever: Must be held against handle to keep blade engaged (deadman switch). Release to stop blade.

Drive Control Lever: Squeeze to engage self-propelled drive; release to disengage. Speed increases with engine throttle.

Height Adjustment: Single lever adjusts all four wheels simultaneously. 6 positions from 1" (lowest) to 3.5" (highest).

Throttle Control: FAST for mowing, SLOW for idling, STOP to shut off engine.

Maintenance Schedule

Regular maintenance ensures optimal performance and extends mower life.

1. Before each use: Check oil level, inspect blade for damage, clear deck of debris.
2. Every 25 hours: Change engine oil (or annually).
3. Every 50 hours: Replace air filter, check spark plug.
4. Every season: Sharpen or replace blade, clean underside of deck.
5. Storage: Drain fuel or add stabilizer, clean thoroughly.

Tip: Always disconnect spark plug wire before performing any maintenance.

Cutting System Operation

3-in-1 system allows mulching, bagging, or side discharge.

1. Mulching: Install mulch plug (closes side discharge). Grass is cut finely and returned to lawn as fertilizer.
2. Bagging: Attach grass bag to rear. Collects clippings for disposal.
3. Side Discharge: Install discharge chute. Ejects clippings to side (right).
4. Height Adjustment: For best results, never cut more than 1/3 of grass height at once.
5. Blade Sharpness: Sharp blade provides cleaner cut, reduces strain on engine.

WARNING! Always stop engine and disconnect spark plug before changing cutting mode.

Safety Features

Blade Control Lever (Deadman Switch): Blade stops within 3 seconds of release. Engine Stop Control: Throttle lever to STOP position. Safety Labels: Read and understand all labels on mower. Protective Footwear: Always wear sturdy shoes while operating.

Storage & Winterization

Proper storage prevents fuel system issues and corrosion.

1. Drain fuel or add stabilizer: Run engine for 5 minutes after adding stabilizer.
2. Change oil: Replace with fresh oil before storage.
3. Clean thoroughly: Remove grass, dirt from deck and underside.
4. Remove spark plug: Add teaspoon of oil to cylinder, pull starter slowly to distribute.
5. Store indoors: In dry, covered location, off ground.

CAUTION! Never store mower with gasoline in tank indoors unless stabilized.

Warranty Information

Murray 425002x99A includes 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 Murray customer service at 1-800-800-7310 or visit www.murray.com. Keep original receipt as proof of purchase.

Troubleshooting

Service: For technical support: 1-800-800-7310; www.murray.com