Murray 7800240 Lawn Mower Manual

The Murray 7800240 is a 20-inch push lawn mower featuring a Briggs & Stratton 125cc engine, 3-in-1 mulching/bagging/side-discharge capability, single-lever height adjustment, durable steel deck, and easy-start system. This manual covers essential safety instructions, assembly, operation, maintenance, troubleshooting, and storage procedures to ensure optimal performance and longevity of your mower.

1. Safety Information 2. Assembly Instructions 3. Controls and Features 4. Specifications 5. Operation Guide 6. Maintenance Schedule 7. Engine Care 8. Storage Guidelines 9. Troubleshooting 10. Warranty Information

Safety Information

Read all instructions before operating. Key safety components: Engine stop lever, blade control handle, discharge chute, and safety labels.

Hazard	Precaution
Rotating Blade	Keep hands and feet away from deck. Disconnect spark plug before maintenance.
Thrown Objects	Clear mowing area of sticks, stones, and debris. Keep bystanders away.
Fuel Handling	Refuel outdoors only when engine is cool. Use approved container.
Hot Surfaces	Avoid contact with muffler and engine during/after operation.
Slope Operation	Mow across slopes, not up and down. Use extra caution on inclines.

WARNING! Failure to follow safety instructions can result in serious injury or death. Always wear sturdy footwear and eye protection.

Assembly Instructions

Unpack all parts and inspect for damage. Assembly requires basic tools (included).

Handle Assembly: Attach lower handle to deck using provided bolts. Connect upper handle and secure with knobs.
Wheels: Slide wheels onto axles and secure with hairpin clips or nuts.
Discharge Chute/Bag: Attach discharge chute or mulch plug as desired. Connect grass bag to rear brackets.
Controls: Connect blade control cable to engine bracket. Adjust for proper tension.
Add Oil & Fuel: Fill engine with SAE 30 oil (check dipstick). Add fresh unleaded gasoline (87 octane minimum).

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

Specifications

Model: Murray 7800240
Cutting Width: 20 inches
Deck Material: Powder-coated steel
Engine: Briggs & Stratton 125cc, 4-cycle
Starting System: Recoil
Cutting Height: 6 positions (1.5" to 3.75")
Capacities: Oil: 20 oz. | Fuel: 0.5 gallon
Collection Bag: 1.9 bushels
Weight: 55 lbs (approx.)

Operation Guide

Front Panel: Engine stop lever, Blade control handle (bail), Height adjustment lever, Primer bulb.

Starting:

Check oil and fuel levels.
Push primer bulb 3 times (cold engine).
Set throttle to FAST position.
Pull blade control handle to handlebar.
Pull starter rope briskly.

Mowing: Adjust height lever before starting. Engage blade control to spin blade. Push mower at walking pace. For bagging, attach bag; for mulching, install plug; for side discharge, attach chute.

Stopping: Release blade control handle. Move throttle to STOP. Wait for all parts to stop before leaving mower.

Maintenance Schedule

Regular maintenance ensures performance and safety.

Interval	Task
Before each use	Check oil level, inspect blade for damage, clear deck of debris.
Every 25 hours	Change engine oil (or annually). Clean/replace air filter.
Every season	Sharpen or replace blade. Check spark plug. Lubricate wheels and height adjuster.
As needed	Clean underside of deck. Inspect cables and hardware.

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

Engine Care

Briggs & Stratton 125cc 4-cycle engine requires air-cooled operation and clean oil.

Oil Change: Run engine briefly to warm oil. Drain via dipstick tube or drain plug into pan. Refill with SAE 30 detergent oil (20 oz).
Air Filter: Remove cover, clean foam pre-cleaner in soapy water, replace paper element if dirty.
Spark Plug: Clean with wire brush, gap to 0.030". Replace annually.
Fuel System: Use fresh gasoline. Add fuel stabilizer for storage. Clean fuel cap vent.

WARNING! Engine and oil become hot during operation. Allow to cool before servicing.

Storage Guidelines

Proper storage prevents corrosion and starting issues.

Run engine to burn off remaining fuel, or add fuel stabilizer to full tank and run for 5 minutes.
Change oil at end of season.
Remove spark plug, add 1 tablespoon of oil into cylinder, pull starter slowly to coat, reinstall plug.
Clean entire mower, especially underside. Touch up any scratches with paint.
Store in dry, covered area. Protect from moisture.

CAUTION! Never store mower with fuel in tank indoors or in enclosed spaces without proper ventilation.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, stale fuel, clogged filter, spark plug fault	Check fuel level, use fresh gas, clean/replace filter, check spark plug.
Engine runs poorly	Dirty air filter, old oil, clogged carburetor	Clean/replace air filter, change oil, clean carburetor jets.
Uneven cutting	Dull/bent blade, uneven tire pressure, clogged deck	Sharpen/balance blade, inflate tires evenly, clean deck underside.
Excessive vibration	Loose blade, damaged blade, debris in blade area	Tighten blade bolt, replace damaged blade, remove debris.
Bag not filling	Wet grass, deck clogged, engine speed too low	Mow when grass is dry, clean deck, run engine at full throttle.

Reset: For engine safety switch issues, ensure blade control handle is fully engaged and cable is adjusted.

Warranty Information

Murray mowers are backed by a limited warranty. The engine is warranted separately by Briggs & Stratton. Proof of purchase is required.

Residential Warranty: 2-year limited warranty on mower.
Engine Warranty: Refer to Briggs & Stratton documentation.
What's Covered: Defects in materials or workmanship under normal use.
What's Not Covered: Damage from misuse, neglect, improper maintenance, or commercial use.

For warranty service, contact an authorized Murray service center with your model (7800240) and serial number. For support, visit www.murray.com or call 1-800-XXX-XXXX.