Murray MNA152703 Lawn Mower Manual

The Murray MNA152703 is a 21-inch, 3-in-1 push lawn mower featuring a 150cc Briggs & Stratton engine, rear bagging, side discharge, and mulching capabilities. It includes a single-lever height adjustment system (1.5" to 4"), durable steel deck, easy-start system, and a 2.1 bushel grass bag. 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 Function Setup 8. Maintenance Schedule 9. Storage Guidelines 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: 150cc Briggs & Stratton engine, 21-inch steel cutting deck, 3-in-1 functionality (bag/mulch/side discharge), single-lever height adjustment, 2.1 bushel rear bag, easy-start system, and durable 10-inch rear wheels.

Feature	Description
Engine	150cc Briggs & Stratton 4-cycle engine
Cutting Width	21 inches
Cutting Deck	Durable steel construction
Cutting Options	Rear bagging, mulching, side discharge
Height Adjustment	Single-lever, 6 positions (1.5" to 4")
Grass Bag Capacity	2.1 bushels
Wheels	10-inch rear, 8-inch front
Starting System	Easy-start recoil
Handle	Foldable for storage
Weight	Approximately 65 lbs

Assembly Instructions

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

Attach handle: Secure upper and lower handle sections with provided bolts.
Install wheels: Attach front and rear wheels to axles; secure with clips.
Attach grass bag: Hang bag on rear bagging chute; ensure secure attachment.
Install side discharge chute: If using side discharge, attach chute to deck opening.
Add oil and fuel: Fill engine with SAE 30 oil (20 oz) and unleaded gasoline.

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

Safety Information

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

Clear mowing area: Remove stones, toys, and debris before mowing.
Check fuel: Fill outdoors, away from ignition sources; wipe spills immediately.
Start safely: Ensure blade control lever is released; stand clear when starting.
Operate carefully: Mow across slopes, not up and down. Watch for obstacles.
Store properly: Allow engine to cool before storing; empty fuel tank if storing >30 days.

CAUTION! Keep hands and feet away from moving parts. Never leave mower unattended while running.

Specifications

Model: MNA152703
Engine: Briggs & Stratton 150cc, 4-cycle
Cutting Width: 21 inches
Cutting Height: 1.5" to 4" (6 positions)
Deck Material: Steel
Grass Bag Capacity: 2.1 bushels
Wheels: 10-inch rear, 8-inch front
Weight: 65 lbs (approx.)
Fuel Type: Unleaded gasoline (87 octane or higher)
Oil Type: SAE 30 (20 oz capacity)

Controls and Operation

Key controls: Blade control lever, throttle control, primer bulb, recoil starter, height adjustment lever.

Starting Procedure:

Check oil and fuel levels.
Push primer bulb 3 times (cold engine).
Set throttle to FAST position.
Pull recoil starter firmly.

Stopping: Release blade control lever; move throttle to STOP. Wait for blade to stop completely.

Operating Tips: Mow at steady pace; overlap passes for even cut. Empty bag when ¾ full.

Cutting Height Adjustment

Single-lever adjustment for all four wheels simultaneously.

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 position.

Height Settings: Position 1 (1.5"), 2 (2"), 3 (2.5"), 4 (3"), 5 (3.5"), 6 (4").

Tip: For first mow of season, set to highest position; gradually lower for subsequent mows.

3-in-1 Function Setup

Configure for bagging, mulching, or side discharge.

Bagging: Install rear bag; ensure mulch plug is removed.
Mulching: Install mulch plug in rear discharge opening; remove bag.
Side Discharge: Attach side discharge chute; remove bag and mulch plug.

WARNING! Always stop engine before changing cutting functions. Ensure all attachments are secure.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Maintenance Task	Frequency
Check oil level	Before each use
Check air filter	Every 25 hours
Sharpen/replace blade	Every season or when dull
Clean underside of deck	After each use
Change oil	First 5 hours, then every 50 hours
Replace spark plug	Every 100 hours

CAUTION! Disconnect spark plug wire before performing any maintenance.

Storage Guidelines

Proper storage prevents damage and extends mower life.

Clean mower thoroughly, especially underside of deck.
Drain fuel or add fuel stabilizer if storing >30 days.
Change oil at end of season.
Store in dry, covered area; fold handle for compact storage.
Remove spark plug and add 1 tablespoon of oil to cylinder; pull starter slowly to coat.

Tip: Inflate tires to recommended pressure before storage.

Warranty Information

Murray MNA152703 comes with a 2-year limited warranty covering defects in materials and workmanship. Warranty does not cover normal wear, misuse, or lack of maintenance. For warranty claims, contact Murray customer service at 1-800-800-7310 or visit www.murray.com. Keep original receipt as proof of purchase.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	No fuel, old gas, clogged air filter	Check fuel level; use fresh gas; 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	Damaged blade, loose parts	Stop engine immediately; inspect blade and tighten bolts.
Grass not discharging	Wet grass, clogged deck	Mow when grass is dry; clean underside of deck.

Service: For technical support, call 1-800-800-7310 or visit www.murray.com.