Murray 7800243 Lawn Mower Manual

The Murray 7800243 is a 21-inch push lawn mower featuring a 190cc Briggs & Stratton engine, 3-in-1 mulching/bagging/side-discharge capability, single-lever height adjustment (1.5-3.75 inches), durable steel deck, easy-start system, and ergonomic handle with soft-grip. This manual covers safety, assembly, operation, maintenance, troubleshooting, and specifications for optimal performance and longevity.

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

Features at a Glance

Key components: 190cc Briggs & Stratton engine, 21-inch steel cutting deck, 3-in-1 system, single-lever height adjustment, rear bagger, ergonomic handle.

Feature	Description
Engine	190cc Briggs & Stratton 4-cycle, easy-start system
Cutting Width	21-inch steel deck
Cutting Options	Mulch, Bag, Side Discharge (3-in-1)
Height Adjustment	Single-lever, 6 positions (1.5" to 3.75")
Drive System	Push-powered (manual)
Bag Capacity	2.0 bushels (rear bagger)
Handle	Ergonomic, foldable, soft-grip
Wheels	8-inch rear, 7-inch front
Weight	Approx. 65 lbs
Fuel Tank	0.95 quarts (unleaded gasoline)

Assembly Instructions

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

Attach handle: Align lower handle sections with deck brackets, secure with bolts and wing nuts.
Install upper handle: Connect to lower handle, secure with provided hardware.
Attach grass bag: Slide bag frame onto rear deck hooks; ensure secure latch.
Install side-discharge chute (if used): Attach to discharge opening on right side.
Add engine oil: Fill with SAE 30 detergent oil (check dipstick).
Add fuel: Use fresh unleaded gasoline (no ethanol preferred).

WARNING! Wear gloves during assembly. Ensure all bolts are tightened securely.

First-Time Setup

Before first use, complete pre-operation checks.

Check oil level: Ensure oil is at full mark on dipstick.
Check fuel: Fill tank with fresh unleaded gasoline.
Inspect blade: Ensure sharpness and secure mounting (bolt torque: 35-40 ft-lbs).
Adjust cutting height: Set lever to desired position (recommend 2.5" for first mow).
Test start: Follow starting procedure; allow engine to warm up.

CAUTION! Operate only in well-ventilated areas. Keep clear of bystanders.

Specifications

Model: Murray 7800243
Engine: 190cc Briggs & Stratton 4-cycle, OHV
Cutting Width: 21 inches
Cutting Height: 1.5" to 3.75" (6 positions)
Deck Material: Powder-coated steel
Wheels: 8" rear, 7" front (ball bearing)
Bag Capacity: 2.0 bushels
Weight: 65 lbs (approx.)
Fuel Type: Unleaded gasoline (87 octane min.)
Oil Type: SAE 30 detergent (20 oz capacity)

Controls and Operation

Handle controls: Engine control lever (combines throttle/choke), recoil starter, height adjustment lever.

Starting Procedure:

Move engine control lever to CHOKE (cold start) or FAST (warm).
Pull recoil starter handle firmly until engine starts.
Move lever to FAST for mowing.

Stopping: Release engine control lever to STOP position.

3-in-1 System: Install mulch plug for mulching; attach bag for collection; install side chute for discharge.

Cutting Height Adjustment

Single-lever adjusts all four wheels simultaneously.

Stop engine and wait for blade to stop.
Pull lever outward and move to desired position (1-6).
Release lever to lock into place.

Height Settings: 1 (1.5"), 2 (2.0"), 3 (2.5"), 4 (2.75"), 5 (3.25"), 6 (3.75").

Tip: For first mow of season, set to highest setting; gradually lower.

Maintenance Schedule

Interval	Task
Before each use	Check oil level; inspect blade; clear deck of debris
Every 25 hours	Change engine oil; clean/replace air filter
Every season	Sharpen/replace blade; check spark plug
As needed	Clean underside of deck; lubricate wheels
Storage	Drain fuel or add stabilizer; store in dry place

Blade Sharpening: Remove blade; maintain original angle; balance before reinstalling.

Storage Guidelines

Prepare mower for off-season storage.

Drain fuel or add fuel stabilizer and run engine 5 minutes.
Change engine oil.
Clean deck thoroughly; remove grass clippings.
Sharpen blade and apply light oil to prevent rust.
Store in cool, dry place; cover with tarp.

CAUTION! Never store with fuel in tank indoors. Disconnect spark plug wire during maintenance.

Safety Information

Read all safety instructions before operation.

Wear sturdy shoes, eye protection, and long pants.
Clear mowing area of stones, sticks, and debris.
Do not mow wet grass.
Never remove grass bag or unclog chute with engine running.
Keep hands and feet away from rotating blade.
Use extreme caution on slopes; mow across, not up/down.
Disconnect spark plug wire before performing maintenance.

DANGER! Rotating blade can cause severe injury. Keep bystanders away.

Warranty & Support

Murray mowers are covered by a limited warranty. Refer to warranty card for details.

Warranty Period: 2 years residential use from date of purchase.

Support: For parts, service, or questions, contact Murray Customer Support at 1-800-800-7310 or visit www.murray.com. Have model number (7800243) and serial number ready.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel; old gas; clogged air filter; spark plug	Add fresh fuel; clean/replace air filter; check spark plug gap.
Engine runs poorly	Dirty carburetor; water in fuel	Drain fuel tank; clean carburetor; use fuel stabilizer.
Uneven cut	Dull blade; uneven tire pressure	Sharpen/replace blade; check tire pressure (20 PSI).
Excessive vibration	Loose blade; bent blade	Tighten blade bolt (35-40 ft-lbs); replace bent blade.
Bag not filling	Wet grass; clogged chute	Mow when grass is dry; stop engine and clear chute.

Reset: For engine issues, refer to engine manual (Briggs & Stratton).

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