Murray 425000 8A Series Lawn Mower Manual

The Murray 425000 8A Series is a walk-behind, self-propelled lawn mower featuring a Briggs & Stratton engine, 21-inch steel cutting deck, 3-in-1 mulching/bagging/side-discharge capability, single-lever height adjustment (6 positions), push-button electric start (on select models), rear-wheel drive, and durable steel construction. Below are key sections for safety, features, assembly, operation, maintenance, troubleshooting, and specifications.

1. Features at a Glance 2. Assembly Instructions 3. First-Time Setup 4. Specifications 5. Controls and Operation 6. Cutting & Discharge Options 7. Maintenance Schedule 8. Storage & Winterization 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Briggs & Stratton engine, 21-inch steel deck, rear bagger, height adjustment lever, self-propelled drive system, electric start (if equipped).

Feature	Description
Engine	Briggs & Stratton, 140cc OHV engine
Cutting Width	21 inches
Cutting Deck	Steel, 3-in-1 (mulch, bag, side-discharge)
Height Adjustment	Single lever, 6 positions (1.5-3.5 inches)
Drive System	Rear-wheel self-propelled
Start Type	Recoil pull start; electric push-button (on select models)
Wheels	8-inch rear, 7-inch front
Fuel Tank	0.95 gallons
Oil Capacity	20 oz (SAE 30 recommended)
Weight	Approx. 65 lbs

Assembly Instructions

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

Attach handle: Insert lower handle into 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 bag is secure.
Install side-discharge chute (if not mulching): Snap into place on right side of deck.
Add engine oil: Fill with SAE 30 oil to full mark on dipstick (do not overfill).
Add fuel: Use fresh unleaded gasoline (87 octane minimum).

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

First-Time Setup

Before first use, complete final checks and adjustments.

Check oil level: Ensure oil is at full mark.
Check tire pressure: Inflate to 15 PSI (if applicable).
Adjust cutting height: Set lever to desired position (middle setting recommended for first mow).
Test controls: Engage drive control; release to stop. Test blade control (must be engaged to start engine).
Start engine: Follow starting procedure (see Controls section).

CAUTION! Operate only in clear, dry conditions. Keep bystanders and pets away.

Specifications

Model Series: 425000 8A
Engine: Briggs & Stratton 140cc, OHV, 4-cycle
Cutting Width: 21 inches
Cutting Heights: 1.5, 2, 2.5, 3, 3.5 inches (6 positions)
Drive: Self-propelled, rear-wheel drive
Start System: Recoil; electric (model-dependent)
Fuel Capacity: 0.95 gallons
Oil Type/Capacity: SAE 30, 20 oz
Deck Material: Steel
Warranty: 2-year limited

Controls and Operation

Handle Controls: Drive control lever, blade control bail, height adjustment lever, throttle control.

Starting Procedure: 1. Push primer bulb 3 times (cold engine). 2. Set throttle to FAST. 3. Pull recoil starter firmly. (Electric start: Turn key/push button.)

Operating: Engage blade control bail to rotate blade. Squeeze drive control lever to self-propel; release to stop. Adjust speed via throttle.

Stopping: Release blade control bail. Engine stops. Wait for blade to stop completely before leaving mower.

Cutting & Discharge Options

3-in-1 system: Mulching, bagging, side-discharge.

Mulching: Install mulch plug (blocks discharge chute). Cuts clippings finely; returns to lawn.
Bagging: Attach grass bag. Collects clippings for disposal.
Side-Discharge: Install discharge chute. Ejects clippings to side (right).

Tip: For best mulching, mow when grass is dry and not too tall. Overlap passes slightly.

Maintenance Schedule

Regular maintenance ensures long life and safe operation.

Interval	Task
Before each use	Check oil level; inspect blade for damage; clear deck of debris
Every 25 hours	Change oil (more often in dusty conditions)
Every season	Replace air filter; check spark plug
As needed	Sharpen blade (balance after sharpening); check tire pressure
Storage	Drain fuel or add stabilizer; clean deck thoroughly

Blade Sharpening: Disconnect spark plug. Remove blade; sharpen at original angle (23°). Balance before reinstalling.

Storage & Winterization

Prepare mower for off-season storage.

Clean deck: Remove all grass and debris.
Drain fuel: Run engine until tank is empty, or add fuel stabilizer.
Change oil: Replace with fresh oil.
Remove spark plug: Add 1 teaspoon oil into cylinder; pull starter slowly to coat.
Store: In dry, covered area. Cover mower.

CAUTION! Never store with fuel in tank indoors. Fuel vapors are flammable.

Regulatory Information

EPA/CARB certified engine. Complies with ANSI B71.1 safety standards. This machine emits spark-ignited engine chemicals known to cause cancer, birth defects, or reproductive harm. For support, visit www.murray.com or contact 1-800-800-7310. Copyright © Murray LLC. All rights reserved.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gas, clogged filter, spark plug	Check fuel; use fresh gas; clean/replace air filter; check spark plug.
Engine runs poorly	Dirty air filter, old fuel, clogged carburetor	Replace air filter; drain old fuel; clean carburetor.
Uneven cut	Dull blade, uneven tire pressure, low speed	Sharpen blade; inflate tires evenly; mow at full throttle.
Self-propel not working	Drive belt worn, control cable loose	Inspect drive belt; adjust/replace cable.
Excessive vibration	Loose blade, bent blade, debris in deck	Tighten blade; replace if bent; clean deck.

Safety Reset: Engine has low-oil shutdown. Check oil level if engine stops unexpectedly.

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