Murray 385048X51 Lawn Mower Manual

The Murray 385048X51 is a 21-inch, 3-in-1 push lawn mower featuring a 159cc Briggs & Stratton engine, rear bagging, side discharge, and mulching capabilities. It includes a single-lever height adjustment system (1.5-3.75 inches), durable steel deck, easy-start system, and a 2-year limited warranty. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 159cc Briggs & Stratton engine, 21-inch steel cutting deck, 3-in-1 functionality (Bag/Mulch/Side Discharge), single-lever height adjustment, rear grass bag, and easy-fold handle.

Assembly Instructions

Unpack all parts from the box. Assembly requires basic tools (included: wrench).

1. Attach the handle: Align lower handle with deck brackets, secure with bolts and wing nuts.
2. Install the upper handle: Connect to lower handle, secure with provided knobs.
3. Attach the grass bag: Hook bag frame onto rear deck brackets.
4. Install side discharge chute (if using): Attach to opening on right side of deck.
5. Add engine oil: Fill with SAE 30 detergent oil (approx. 20 oz.) as per engine manual.
6. Add gasoline: Use fresh unleaded gasoline (87 octane or higher).

WARNING! Do not add gasoline during assembly or in enclosed spaces. Keep away from sparks or flames.

First-Time Setup

Before first use, complete final checks and safety procedures.

1. Check oil level: Ensure oil is at full mark on dipstick.
2. Check tire pressure: Inflate to 15-20 PSI if necessary.
3. Select cutting mode: Install appropriate chute or plug for bagging, mulching, or side discharge.
4. Adjust cutting height: Set lever to desired position (recommend 2.5-3 inches for first mow).
5. Start engine: Follow starting procedure in engine manual.

CAUTION! Always mow in daylight with clear visibility. Clear lawn of debris before mowing.

Specifications

• Model: Murray 385048X51
• Engine: Briggs & Stratton 675 Series, 159cc, 4-cycle
• Cutting Width: 21 inches
• Cutting Height Range: 1.5 - 3.75 inches (6 positions)
• Deck: 21-inch steel, 3-in-1 capability
• Wheels: 8-inch rear, 7-inch front
• Bag Capacity: 2.0 bushels
• Weight: Approx. 65 lbs
• Fuel Tank Capacity: 0.95 quarts
• Oil Capacity: 20 oz. (SAE 30)
• Warranty: 2-year limited warranty

Controls and Operation

Primary controls: Engine throttle control, recoil starter, blade control bail, and height adjustment lever.

Starting Procedure:

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

Stopping Procedure: Release blade control bail to stop blade. Move throttle to STOP position to stop engine.

Blade Control Bail: Must be held against handle to keep blade engaged. Automatically stops blade when released.

Cutting Height Adjustment

Single-lever system adjusts all four wheels simultaneously.

1. Locate adjustment lever on right side of deck near wheel.
2. Pull lever outward and move to desired position (1-6).
3. Release lever to lock in position.
4. Verify all wheels are at same height.

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

Tip: For healthier grass, never cut more than 1/3 of grass height at one time.

Maintenance Schedule

WARNING! Always disconnect spark plug wire before performing any maintenance.

Storage Guidelines

Proper storage extends mower life and ensures easy starting next season.

1. Clean mower thoroughly, especially underside of deck.
2. Drain or stabilize fuel: Run engine dry or add fuel stabilizer.
3. Change oil if near service interval.
4. Remove spark plug, add 1 tablespoon of oil to cylinder, pull starter slowly to distribute.
5. Store in clean, dry place, protected from elements.
6. Cover mower to prevent dust accumulation.

CAUTION! Never store mower with fuel in tank in enclosed area or near open flame.

Safety Information

General Safety Rules:

• Read manual completely before operation.
• Clear mowing area of stones, toys, and other objects.
• Always wear sturdy footwear and eye protection.
• Do not mow wet grass.
• Never leave mower unattended with engine running.
• Keep children and pets away from mowing area.
• Use extreme caution when mowing on slopes.
• Always push mower forward; never pull backward.

Blade Safety: The blade is sharp and rotates at high speed. Always disconnect spark plug before inspecting or servicing blade.

Warranty Information

Murray 385048X51 comes with a 2-year limited warranty covering defects in materials or workmanship under normal residential use. Warranty does not cover damage from misuse, neglect, commercial use, or improper maintenance. Engine is covered by separate Briggs & Stratton warranty. To make a warranty claim, contact Murray customer service at 1-800-269-6215 or visit www.murray.com. Proof of purchase required.

Troubleshooting

Service: For technical support, call 1-800-269-6215 or visit www.murray.com.