Murray 312006x51A Lawn Mower Manual

The Murray 312006x51A 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, durable steel deck, and easy-start system. 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. 3-in-1 Function Setup 8. Safety Features 9. Maintenance & Storage 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: 190cc Briggs & Stratton engine, 21-inch steel cutting deck, rear grass bag, mulch plug, discharge chute, single-lever height adjuster, and recoil starter.

Feature	Description
Engine	190cc Briggs & Stratton 4-cycle engine
Cutting Width	21 inches
Cutting Deck	Durable steel construction
Cutting Options	3-in-1 (Mulch, Bag, Side Discharge)
Height Adjustment	Single-lever, 6 positions (1.5-3.75 inches)
Starting System	Recoil starter
Wheels	8-inch rear, 7-inch front
Fuel Tank	1-quart capacity
Handle	Foldable for storage
Safety Features	Blade control lever with engine kill switch

Assembly Instructions

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

Attach handle: Align lower handle with deck brackets, secure with bolts and wing nuts.
Install upper handle: Connect to lower handle, secure with provided hardware.
Attach grass bag: Hook bag frame onto rear deck brackets.
Install mulch plug (if mulching): Insert into rear discharge opening.
Install side discharge chute (if side discharging): Attach to deck opening.
Check wheel installation: Ensure all wheels are securely fastened.

WARNING! Wear gloves during assembly. Ensure all fasteners are tight before operation.

First-Time Setup

Before first use, complete these steps.

Add engine oil: Use SAE 30 detergent oil (approx. 20 oz). Check dipstick.
Add fuel: Use unleaded gasoline with minimum 87 octane. Do not overfill.
Check blade: Ensure blade is properly installed and sharp.
Adjust cutting height: Set lever to desired position (middle setting recommended).
Test operation: Start engine in clear area, engage blade, check for vibration.

CAUTION! Never add fuel while engine is hot. Allow engine to cool completely.

Specifications

Model: Murray 312006x51A
Engine: 190cc Briggs & Stratton 4-cycle
Cutting Width: 21 inches
Cutting Height: 6 positions, 1.5-3.75 inches
Deck Material: Steel
Wheels: 8-inch rear, 7-inch front
Fuel Capacity: 1 quart
Oil Capacity: 20 oz
Weight: 65 lbs (approx.)
Warranty: 2-year limited

Controls and Operation

Main controls: Engine throttle, blade control lever, recoil starter, height adjustment lever.

Starting Procedure:

Check oil and fuel levels.
Move throttle to FAST position.
Prime engine (if equipped) by pressing primer bulb 3 times.
Pull recoil starter firmly.
To engage blade: Press and hold blade control lever against handle.

Stopping: Release blade control lever, move throttle to STOP, wait for blade to stop completely.

Cutting Height Adjustment

Single-lever adjustment controls all four wheels simultaneously.

Stop engine and wait for blade to stop.
Pull height adjustment lever toward wheel.
Move lever to desired position (1=lowest, 6=highest).
Release lever to lock in position.
Test adjustment by rolling mower on flat surface.

Tip: For first cut of season or overgrown grass, use highest setting.

3-in-1 Function Setup

Configure for mulching, bagging, or side discharge.

Mulching: Install mulch plug in rear discharge opening. Remove grass bag.
Bagging: Remove mulch plug. Attach grass bag to rear brackets.
Side Discharge: Remove mulch plug and grass bag. Install side discharge chute.

WARNING! Always stop engine before changing cutting functions. Keep hands away from discharge area.

Safety Features

Blade control lever: Must be held against handle to keep blade engaged. Releases to stop blade and engine. Safety labels: Read and understand all warning labels on mower. Protective equipment: Always wear safety glasses, long pants, and sturdy shoes.

Maintenance & Storage

Regular maintenance ensures optimal performance and longevity.

After each use: Clean underside of deck, check for damage.
Monthly: Check blade sharpness and balance. Sharpen or replace as needed.
Seasonal: Change engine oil, replace air filter, check spark plug.
Storage: Drain fuel or add fuel stabilizer. Store in dry, covered area.

CAUTION! Disconnect spark plug wire before performing any maintenance.

Warranty Information

2-year limited warranty for residential use. Warranty covers defects in materials and workmanship. Not covered: Normal wear, improper maintenance, commercial use, or damage from abuse. For warranty service, 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 fuel, clogged air filter	Add fresh fuel, clean/replace air filter, check spark plug.
Engine runs poorly	Dirty air filter, old fuel	Clean air filter, drain and replace fuel.
Uneven cutting	Dull blade, uneven tire pressure	Sharpen or replace blade, check tire pressure.
Excessive vibration	Loose blade, bent blade	Tighten blade bolt, replace bent blade.
Grass not discharging	Wet grass, clogged deck	Wait for grass to dry, clean underside of deck.
Wheels not turning	Debris in wheel axles	Clean wheel axles, lubricate if necessary.

Service: For repairs beyond basic maintenance, contact authorized service center.

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