Murray F4315120-DECK Lawn Mower Manual

The Murray F4315120-DECK is a 20-inch push lawn mower featuring a Briggs & Stratton engine, 3-in-1 mulching/bagging/side-discharge capability, adjustable cutting heights, easy-start system, durable steel deck, and ergonomic handle with soft-grip. Designed for residential use with standard grass collection bag. 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 8. Safety Features 9. Maintenance & Storage 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: Briggs & Stratton engine, 20-inch steel cutting deck, 3-in-1 system, height adjustment lever, grass collection bag, ergonomic handle.

Feature	Description
Engine	Briggs & Stratton 140cc OHV engine
Cutting Width	20 inches
Cutting System	3-in-1 (Mulch, Bag, Side-Discharge)
Deck Material	Durable steel construction
Height Adjustment	Single-lever, 6 positions (1.5-3.5 inches)
Starting System	Easy-start recoil
Handle	Ergonomic design with soft-grip
Wheels	8-inch rear, 7-inch front
Bag Capacity	1.8 bushels
Weight	Approx. 60 lbs

Assembly Instructions

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

Attach handle: Align handle brackets with deck mounts, secure with provided bolts.
Install wheels: Insert axles through wheel hubs, secure with washers and nuts.
Attach grass bag: Hook bag frame onto rear deck mounts.
Install discharge chute: Attach to side port if using side-discharge.
Check all fasteners: Ensure all bolts and nuts are tight.

WARNING! Wear gloves during assembly. Keep hands clear of sharp edges.

First-Time Setup

Before first use, complete these steps.

Add engine oil: Fill with SAE 30 detergent oil (check dipstick).
Add fuel: Use fresh unleaded gasoline (max 10% ethanol).
Check tire pressure: Inflate to 20 PSI.
Inspect blade: Ensure it is sharp and securely fastened.
Test start: Pull recoil starter slowly until resistance, then briskly.

CAUTION! Perform setup outdoors. Keep fuel away from ignition sources.

Specifications

Model: Murray F4315120-DECK
Engine: Briggs & Stratton 140cc, 4-cycle
Cutting Width: 20 inches
Cutting Heights: 6 positions, 1.5-3.5 inches
Deck: 20-inch steel, 3-in-1 capability
Wheels: 8-inch rear, 7-inch front
Bag Capacity: 1.8 bushels
Weight: 60 lbs (approx.)
Fuel Tank: 0.5 gallons
Oil Capacity: 20 oz

Controls and Operation

Handle Controls: Drive control bar (safety), height adjustment lever, throttle control.

Starting: 1. Check oil and fuel. 2. Push primer bulb 3 times. 3. Set throttle to FAST. 4. Pull recoil starter.

Stopping: Release drive control bar, move throttle to STOP.

Operation: Engage drive control bar to self-propel. Release to stop movement. Adjust speed with throttle.

Cutting Height Adjustment

Single-lever adjustment for all four wheels.

Stop engine and wait for blade to stop.
Pull height adjustment lever outward.
Move lever to desired position (1-6).
Release lever to lock in place.

Tip: For first cut of season, set to highest position. Gradually lower for subsequent mows.

Mulching & Bagging

3-in-1 system: Install appropriate accessory.

Mulching: Install mulch plug (included). Grass clippings are cut finely and returned to lawn.
Bagging: Attach grass bag to rear. Empty when bag is 2/3 full.
Side-Discharge: Attach discharge chute to side port. Direct clippings away from work area.

WARNING! Always stop engine before changing cutting mode.

Safety Features

Drive control bar: Must be engaged for self-propulsion and blade rotation. Blade brake: Stops blade within 3 seconds when control bar is released. Engine kill switch: Stops engine if operator leaves position.

Maintenance & Storage

Regular maintenance ensures optimal performance.

After each use: Clean underside of deck. Check blade for damage.

Monthly: Check oil level. Inspect air filter. Lubricate wheel axles.

Seasonal: Sharpen or replace blade. Change oil. Clean or replace spark plug.

Storage: Drain fuel or add stabilizer. Store in dry, covered area.

CAUTION! Disconnect spark plug before performing maintenance.

Warranty Information

Limited 2-year warranty for residential use. Proof of purchase required. Warranty covers defects in materials/workmanship. Does not cover normal wear, misuse, or lack of maintenance. For warranty service, contact Murray customer service at 1-800-800-7310 or visit www.murray.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gas, clogged filter	Add fresh fuel; check fuel line; clean/replace air filter.
Poor cutting performance	Dull blade, low engine speed	Sharpen/replace blade; set throttle to FAST.
Uneven cut	Uneven tire pressure, worn blade	Inflate tires evenly; balance or replace blade.
Excessive vibration	Loose blade, bent crankshaft	Tighten blade bolt; inspect for damage.
Self-propel not working	Drive belt worn, control cable loose	Inspect drive belt; adjust control cable tension.

Service: For repairs, use authorized service centers. Always use genuine Murray parts.

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