Murray 7800258 Lawn Mower Manual

The Murray 7800258 is a walk-behind, self-propelled 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 instructions, assembly, operation, maintenance, troubleshooting, and specifications to ensure safe and efficient use.

1. Safety Instructions 2. Assembly Guide 3. Controls and Features 4. Operation Instructions 5. Maintenance Schedule 6. Storage Guidelines 7. Troubleshooting 8. Specifications 9. Warranty Information

Safety Instructions

Read all instructions before operating. Failure to follow warnings may result in serious injury or death.

Hazard	Precaution
Rotating Blade	Keep hands and feet away from deck. Disconnect spark plug before any maintenance.
Fuel Handling	Refuel outdoors only when engine is cool. Use approved fuel container.
Slope Operation	Do not mow on slopes greater than 15 degrees. Mow across slopes, not up and down.
Debris & Objects	Clear mowing area of stones, toys, and other objects that could be thrown.
Children & Pets	Keep bystanders, especially children and pets, at a safe distance.
Hot Surfaces	Avoid contact with muffler and engine; they become extremely hot during use.

Assembly Guide

Unpack all parts and verify contents against parts list. Assembly requires basic tools (included).

Handle Assembly: Attach upper and lower handle sections using provided bolts and wrenches.
Wheel Installation: Slide wheels onto axles and secure with retaining clips or nuts.
Height Adjustment Lever: Connect to deck and test all height settings (1-4 inches).
Bagging/Mulching Kit: Attach rear bagger or mulch plug as per intended use.
Oil & Fuel: Add engine oil (SAE 30) to full mark. Add fresh unleaded gasoline (87 octane minimum).

WARNING! Do not start engine until assembly is complete and all fasteners are tightened.

Controls and Features

Familiarize yourself with all controls before starting the engine.

Engine Control Lever: Must be engaged to start and run engine. Releases to stop engine.
Drive Control Lever: Squeeze to engage self-propelled drive; release to stop drive.
Height Adjustment Lever: Single lever adjusts all four wheels simultaneously (1" to 4").
Recoil Starter Handle: Pull to start engine.
Fuel Shut-Off Valve: Located near fuel tank. Turn off for storage or transport.
3-in-1 Discharge: Select mulch, bag, or side discharge using included accessories.

Operation Instructions

Follow these steps for safe and effective mowing.

Pre-Start Check: Check oil level, tire pressure, and clear area of debris.
Starting Engine: Move throttle to FAST, engage engine control lever, pull recoil starter firmly.
Engaging Drive: Squeeze drive control lever to begin self-propelled motion.
Cutting Height: Adjust lever to desired setting before starting mower.
Stopping Engine: Release engine control lever. Wait for all moving parts to stop.
Emptying Bag: Stop engine, disconnect spark plug, and empty grass catcher when full.

CAUTION! Never leave mower unattended with engine running. Always operate in clear daylight.

Maintenance Schedule

Regular maintenance ensures long life and optimal performance.

Interval	Task
Before each use	Check oil level, tire pressure, blade condition, and fasteners.
Every 25 hours	Change engine oil (SAE 30). Clean or replace air filter.
Every season	Sharpen or replace blade. Check spark plug and replace if worn.
As needed	Clean underside of deck. Lubricate wheel bearings and height adjustment points.
Storage	Drain fuel or add stabilizer. Run engine dry. Store in dry, covered location.

Storage Guidelines

Proper storage prevents fuel system issues and corrosion.

Clean entire mower, especially underside of deck.
Drain fuel tank or add fuel stabilizer and run engine for 5 minutes.
Change oil and replace air filter at end of season.
Remove spark plug, add a teaspoon of oil to cylinder, and pull starter slowly to coat.
Store in a clean, dry place, preferably covered.

WARNING! Gasoline is highly flammable. Store fuel only in approved containers away from ignition sources.

Troubleshooting

Problem	Possible Cause	Solution
Engine won't start	Empty fuel tank, old gasoline, clogged air filter, disconnected spark plug wire.	Add fresh fuel, clean/replace air filter, check spark plug connection.
Poor cutting performance	Dull blade, low engine speed, wet grass, deck clogged.	Sharpen/replace blade, set throttle to FAST, mow when dry, clean deck.
Mower vibrates excessively	Damaged or unbalanced blade, loose fasteners, debris wrapped around blade.	Inspect and balance/replace blade, tighten all bolts, clean deck interior.
Self-propelled drive not working	Drive belt loose or broken, drive control cable out of adjustment.	Inspect belt and replace if worn. Adjust cable tension per manual.
Engine runs rough or stalls	Dirty carburetor, water in fuel, old spark plug.	Drain fuel tank, add fresh fuel. Clean carburetor or replace spark plug.

Specifications

Model: Murray 7800258
Engine: Briggs & Stratton 125cc, 4-cycle
Cutting Width: 21 inches
Cutting Height: 1 to 4 inches (6 positions)
Cutting System: 3-in-1 (Mulch, Bag, Side Discharge)
Drive System: Rear-wheel self-propelled
Wheels: 8-inch rear, 7-inch front
Fuel Tank Capacity: 1.0 quart (0.95 liters)
Oil Capacity: 20 oz (0.6 liters) SAE 30
Weight: 65 lbs (29.5 kg)

Warranty Information

The Murray 7800258 Lawn Mower is covered by a limited warranty. For warranty service, contact an authorized Murray service dealer. Proof of purchase is required.

Limited Warranty: 2-year limited warranty on the mower. 2-year warranty on the Briggs & Stratton engine (separate manufacturer's warranty applies).

Exclusions: Normal wear items (blades, belts, cables), damage from misuse, neglect, accident, or improper maintenance. Commercial use voids warranty.

Customer Support: For parts, manuals, or dealer locations, visit www.murray.com or call 1-800-XXX-XXXX.