Murray 309008X51 Lawn Mower Manual

The Murray 309008X51 is a 21-inch push lawn mower featuring a 3-in-1 mulching, bagging, and side-discharge system, powered by a 140cc Briggs & Stratton engine with ReadyStart® technology, 6-position single-lever height adjustment, durable steel deck, and foldable handle for easy storage. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 21-inch steel cutting deck, Briggs & Stratton 140cc engine, 3-in-1 system (mulch/bag/side-discharge), single-lever height adjustment, foldable handle, rear bagger, and easy-start technology.

Assembly Instructions

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

1. Attach handle: Insert lower handle into deck brackets, secure with bolts and wing nuts.
2. Install upper handle: Connect to lower handle, tighten knobs.
3. Attach grass bag: Hook bag frame onto rear deck brackets.
4. Install side-discharge chute: Attach to discharge opening with provided pin.
5. Install wheels: Slide axles through deck, secure with washers and clips.
6. Check oil: Engine comes pre-filled; verify level is at "Full" mark.

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

First-Time Setup

Before first use, complete these steps.

1. Add fuel: Use fresh unleaded gasoline (87 octane or higher). Do not overfill.
2. Check engine oil: Ensure level is correct; add SAE 30 detergent oil if needed.
3. Adjust cutting height: Set lever to desired position (recommend 3 inches for first mow).
4. Select cutting mode: Install mulch plug, bag, or side-discharge chute as desired.
5. Test start: In open area, pull starter cord firmly.

CAUTION! Never add fuel while engine is hot or running. Work in well-ventilated area.

Specifications

• Model: Murray 309008X51
• Cutting Width: 21 inches
• Engine: Briggs & Stratton 140cc, 4-cycle
• Starting System: Recoil with ReadyStart® (no priming)
• Cutting Heights: 1.5 to 3.5 inches (6 positions)
• Deck: 21-inch steel, 3-in-1 capability
• Bag Capacity: 2.1 bushels
• Wheels: 8-inch rear, 7-inch front
• Fuel Capacity: 0.5 gallon
• Weight: 55 lbs (approx.)

Controls and Settings

Handle Controls: Throttle lever (FAST/SLOW/STOP), drive control bar (self-propelled models), height adjustment lever.

Height Adjustment: Single lever adjusts all four wheels simultaneously. Positions: 1.5, 2, 2.5, 3, 3.25, 3.5 inches.

Cutting Mode Selection: Mulch: Install mulch plug. Bag: Attach grass bag. Side-Discharge: Install discharge chute.

Engine Controls: Throttle lever (set to FAST for mowing, SLOW for idle, STOP to shut off). Choke (not needed with ReadyStart®).

Operation Guide

Starting and mowing procedures.

1. Pre-start check: Ensure area is clear, cutting mode selected, height set.
2. Starting engine: Set throttle to FAST, pull starter cord firmly until engine starts.
3. Mowing: Walk at steady pace, overlap passes slightly for even cut.
4. Stopping: Release drive control (if equipped), move throttle to STOP.
5. Bag emptying: Stop engine, remove bag, empty clippings.
6. Mode change: Stop engine before changing between mulch, bag, or discharge.

Tip: Mow when grass is dry for best results. Avoid mowing in extreme heat.

Maintenance Schedule

Regular maintenance ensures long life and optimal performance.

1. After each use: Clean underside of deck, check for damage.
2. Every 25 hours: Check air filter, clean or replace if dirty.
3. Every 50 hours: Change engine oil (SAE 30 detergent).
4. Every season: Sharpen or replace blade, check spark plug.
5. Storage: Drain fuel or add stabilizer, run engine dry.

WARNING! Always disconnect spark plug wire before performing maintenance.

Storage Instructions

Proper storage prevents damage and starting issues next season.

1. Clean mower thoroughly, especially underside.
2. Drain fuel tank or add fuel stabilizer and run engine 5 minutes.
3. Change oil if due.
4. Remove spark plug, add teaspoon of oil to cylinder, pull starter slowly.
5. Store in dry, covered area, with handle folded if space is limited.

CAUTION! Store away from open flames or heat sources.

Safety Information

Read and follow all safety instructions in manual.

• Wear sturdy shoes, eye protection, long pants.
• Clear mowing area of stones, sticks, debris.
• Never mow wet grass.
• Keep hands and feet away from moving parts.
• Do not allow children to operate mower.
• Stop engine before unclogging or adjusting.

DANGER! Gasoline is flammable. Refuel outdoors only, with engine cool.

Warranty & Support

Murray mowers are backed by a limited warranty. For model 309008X51, warranty covers defects in materials/workmanship for residential use. Proof of purchase required. For support, visit www.murray.com or contact 1-800-269-6215.

Troubleshooting

Service: For repairs, contact authorized Murray service center. Use genuine parts.

Support: 1-800-269-6215; www.murray.com