Murray 7800241 Lawn Mower Manual

The Murray 7800241 is a 21-inch push lawn mower featuring a 140cc Briggs & Stratton engine, 3-in-1 mulching/bagging/side discharge capability, single-lever height adjustment (6 positions: 1.25"-3.75"), durable steel deck, easy-start system, and rear-bagging collection system. Designed for residential use with safety features including blade control system and operator presence control. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly Instructions 3. Safety Information 4. Specifications 5. Controls and Operation 6. Cutting Height Adjustment 7. 3-in-1 Discharge System 8. Maintenance Schedule 9. Storage Guidelines 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: 140cc Briggs & Stratton engine, 21-inch steel cutting deck, rear grass bag, height adjustment lever, blade control handle, and discharge chute.

Feature	Description
Engine	140cc Briggs & Stratton 450E series, 4-cycle
Cutting Width	21 inches
Cutting Height	6 positions (1.25" to 3.75")
Discharge Options	Mulch, Bag, Side Discharge (3-in-1)
Starting System	Recoil with Easy-Spin™ technology
Deck Material	Powder-coated steel
Wheels	8-inch rear, 7-inch front
Bag Capacity	1.9 bushels (rear bag)
Weight	Approximately 60 lbs
Safety Features	Blade control system, operator presence control

Assembly Instructions

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

Attach handle: Insert lower handle into deck brackets, secure with bolts and wing nuts.
Install grass bag: Attach bag support frame to rear deck, hang collection bag.
Attach discharge chute: Secure chute to side discharge opening with provided pin.
Install height adjustment lever: Connect to deck adjustment mechanism.
Add engine oil: Fill with SAE 30 detergent oil (18 oz. capacity).
Add gasoline: Use fresh unleaded gasoline (minimum 87 octane).

WARNING! Do not add gasoline during assembly. Keep away from sparks or flames.

Safety Information

Read all instructions before operation. Always wear appropriate safety gear.

Clear mowing area: Remove stones, toys, and other objects that could be thrown.
Check equipment: Ensure all bolts and nuts are tight before each use.
Operator safety: Wear sturdy shoes, long pants, and eye protection.
Children and pets: Keep them away from mowing area.
Slope operation: Mow across slopes, not up and down.
Fuel safety: Refuel outdoors only when engine is cool.

DANGER! Never place hands or feet under mower deck while engine is running. Disconnect spark plug before performing maintenance.

Specifications

Model: Murray 7800241
Engine: Briggs & Stratton 450E, 140cc, 4-cycle
Cutting Width: 21 inches
Cutting Height Range: 1.25" to 3.75" (6 positions)
Deck: 21-inch steel, powder-coated
Discharge Options: Mulch, Bag, Side Discharge
Bag Capacity: 1.9 bushels
Wheels: 8-inch rear, 7-inch front
Weight: 60 lbs (approx.)
Fuel Capacity: 0.5 gallons
Oil Capacity: 18 oz. SAE 30

Controls and Operation

Handle controls: Blade control lever, operator presence control bar, height adjustment lever.

Starting Procedure:

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

Stopping Procedure: Release blade control lever. Engine will stop. Move throttle to STOP position.

Operating Tips: Mow when grass is dry. Overlap cutting rows by 2-3 inches. Change mowing pattern regularly.

Cutting Height Adjustment

Single-lever adjustment for all four wheels simultaneously.

Stop engine and wait for blade to stop completely.
Pull height adjustment lever toward wheel.
Move lever to desired position (1-6, with 1 being lowest).
Release lever to lock in position.

Height Settings: 1=1.25", 2=1.75", 3=2.25", 4=2.75", 5=3.25", 6=3.75"

Tip: For first mow of season, set to highest position. Never remove more than 1/3 of grass height at one time.

3-in-1 Discharge System

Configure for mulching, bagging, or side discharge.

Mulching: Install mulch plug in discharge opening. Grass clippings are cut finely and returned to lawn.
Bagging: Remove mulch plug, install grass bag. Collects clippings for disposal.
Side Discharge: Remove mulch plug and bag, install discharge chute. Ejects clippings to side.

WARNING! Always stop engine before changing discharge configuration. Ensure all parts are securely installed.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Maintenance	Frequency	Procedure
Check engine oil	Before each use	Maintain proper level; change every 25 hours
Clean underside of deck	After each use	Scrape off grass buildup (engine off, spark plug disconnected)
Check blade sharpness	Every 25 hours	Sharpen or replace dull blades
Replace air filter	Every season	Clean foam pre-cleaner; replace paper element if dirty
Change spark plug	Every 100 hours	Replace with Champion RC12YC or equivalent
Check wheel bolts/nuts	Monthly	Tighten if loose

Storage Guidelines

Proper storage prevents fuel system issues and corrosion.

Drain fuel tank or add fuel stabilizer.
Run engine until it stops to clear carburetor.
Change engine oil (end of season).
Clean entire mower, especially underside of deck.
Remove spark plug, add 1 oz. oil to cylinder, pull starter slowly to distribute.
Store in clean, dry place, protected from elements.

CAUTION! Never store mower with fuel in tank indoors or in enclosed spaces.

Warranty Information

Murray 7800241 comes with a 2-year limited warranty covering defects in materials and workmanship. Warranty does not cover normal wear, improper maintenance, or commercial use. Proof of purchase required. For warranty service, contact Murray customer service at 1-800-800-7310 or visit www.murray.com. Keep this manual and purchase receipt for warranty claims.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gasoline, clogged air filter	Add fresh fuel, clean/replace air filter, check spark plug
Engine runs poorly	Dirty air filter, old gasoline	Clean air filter, drain and replace fuel
Uneven cutting	Dull blade, uneven tire pressure	Sharpen or replace blade, check tire pressure
Vibration	Loose blade, bent blade, debris in blade	Tighten blade bolts, replace bent blade, clean debris
Grass not discharging	Wet grass, deck clogged, engine speed too low	Mow when dry, clean deck, run at full throttle
Wheels not turning	Debris in wheel gears, damaged axle	Clean wheel area, check for obstructions

Service: For technical support: 1-800-800-7310, Monday-Friday 8am-8pm EST. Online: www.murray.com