Murray 425001 8B Series Lawn Mower Manual

The Murray 425001 8B 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, rear-wheel drive, and a durable steel construction. Designed for residential use, it offers reliable performance for medium-sized lawns. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly Instructions 3. First-Time Setup 4. Specifications 5. Controls and Operation 6. Cutting Height Adjustment 7. Mulching, Bagging & Side Discharge 8. Safety Features 9. Maintenance Schedule 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: 21-inch steel cutting deck, Briggs & Stratton engine, Rear-wheel drive system, Single-lever height adjustment, 3-in-1 functionality, Grass bag, Handle with controls.

Feature	Description
Cutting Deck	21-inch steel deck for durable cutting
Engine	Briggs & Stratton 125cc OHV engine
Drive System	Self-propelled rear-wheel drive
Height Adjustment	Single-lever adjusts all wheels (1-3 inches)
3-in-1 Function	Mulch, bag, or side-discharge clippings
Grass Bag	2-bushel capacity bag with easy-empty feature
Handle	Foldable handle with ergonomic grips
Starter	Recoil pull-start system
Wheels	8-inch rear, 7-inch front wheels
Safety Key	Engine stop safety feature

Assembly Instructions

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

Attach handle: Secure upper and lower handle sections with provided bolts and wing nuts.
Install grass bag: Attach bag support brackets to deck, then hook bag onto brackets.
Connect drive cable: Route drive control cable to engine and secure with clamp.
Install side-discharge chute: Attach to deck opening if using side-discharge mode.
Add oil and fuel: Fill engine with SAE 30 oil (check dipstick) and unleaded gasoline.

WARNING! Keep hands and feet clear of cutting blade during assembly. Wear gloves.

First-Time Setup

Before first use, complete these steps.

Check oil level: Ensure oil is at full mark on dipstick.
Add fuel: Use fresh unleaded gasoline with no more than 10% ethanol.
Adjust cutting height: Set single lever to desired height (recommend 2.5 inches for first mow).
Test operation: Start engine in open area, engage drive, and check blade engagement.
Select mode: Install mulch plug, bag, or side-discharge chute as needed.

CAUTION! Never add fuel while engine is hot or running. Allow to cool.

Specifications

Model Series: 425001 8B Series.
Cutting Width: 21 inches.
Engine: Briggs & Stratton 125cc OHV, 4500 RPM.
Cutting Heights: 6 positions, 1 to 3 inches.
Drive: Self-propelled rear-wheel drive.
Bag Capacity: 2 bushels.
Deck Material: Powder-coated steel.
Warranty: 2-year limited warranty.
Weight: 65 lbs (approx.).

Controls and Operation

Handle controls: Drive control lever, Blade engagement lever, Height adjustment lever.

Starting: Insert safety key, press primer bulb 3 times, set choke, pull recoil starter.

Driving: Squeeze drive lever to handle to engage self-propulsion; release to stop.

Blade Engagement: Pull blade engagement lever to handle to start cutting blade.

Stopping: Release blade lever, then drive lever. Remove safety key to stop engine.

Cutting Height Adjustment

Single-lever adjusts all four wheels simultaneously.

Locate height adjustment lever on left side of deck.
Pull lever outward and move to desired setting (1-6).
Release lever to lock in position.
Recommended: Higher setting for first mow of season or uneven terrain.

Tip: Always stop engine and blade before adjusting height.

Mulching, Bagging & Side Discharge

3-in-1 system allows choice of clipping management.

Mulching: Install mulch plug in rear discharge opening. Cuts clippings finely back into lawn.
Bagging: Attach grass bag to rear brackets. Empty when bag is 2/3 full.
Side Discharge: Install discharge chute on right side. Use for tall/wet grass.

WARNING! Always ensure proper attachment is secured before operation.

Safety Features

Safety Key: Must be inserted to start engine; removes to stop. Blade Brake Clutch: Stops blade within 3 seconds when lever released. Operator Presence Control: Engine stops if handle is released. Protective Deck: Shields blade area.

Maintenance Schedule

Regular maintenance ensures long life and performance.

Before each use: Check oil, inspect blade for damage, clear deck of debris.
Every 25 hours: Change engine oil, check air filter, sharpen blade.
Every season: Replace spark plug, clean underside of deck, lubricate wheels.
Storage: Drain fuel or add stabilizer, clean thoroughly, store in dry place.

CAUTION! Disconnect spark plug wire before any maintenance.

Warranty Information

2-year limited warranty for residential use. Warranty covers defects in materials/workmanship. Not covered: normal wear, misuse, commercial use, lack of maintenance. For warranty service, contact Murray customer service at 1-800-800-7310 or visit www.murray.com. Keep dated sales receipt.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel/safety key	Check fuel level; insert safety key; press primer bulb.
Poor cutting performance	Dull blade/wrong height	Sharpen or replace blade; adjust cutting height.
Self-propel not working	Drive cable loose	Adjust drive cable tension; check for debris in wheels.
Excessive vibration	Damaged blade/debris	Stop engine, check for bent blade; clean deck interior.
Grass not discharging	Wet grass/clogged deck	Mow when grass is dry; clean underside of deck.

Service: For repairs, use authorized service centers. Engine service: refer to Briggs & Stratton manual.

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