Black & Decker MM850 Lawn Mower Manual

The Black & Decker MM850 is a powerful electric lawn mower designed for efficient grass cutting. It features a 12-amp motor, a 20-inch cutting deck, and adjustable cutting heights to ensure a clean and precise cut. The mower is lightweight, easy to maneuver, and includes a grass collection bag for easy disposal. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Operating the Mower 8. Maintenance 9. Safety Information 10. Troubleshooting

Features at a Glance

Key components: 12-amp motor, 20-inch cutting deck, adjustable cutting heights, grass collection bag, lightweight design.

Feature	Description
12-amp motor	Powerful motor for efficient grass cutting
20-inch cutting deck	Wide cutting area for faster mowing
Adjustable cutting heights	Multiple height settings for different grass types
Grass collection bag	Convenient collection of clippings
Lightweight design	Easy to maneuver and transport

Installation

Unpack the mower and inspect contents. Ensure all parts are included.

Attach the handle: Align the handle with the mower body and secure with screws.
Install the grass collection bag: Attach the bag to the rear of the mower.
Check the power cord: Ensure it is free of damage before use.
Plug into a power outlet: Use a grounded outlet for safety.

WARNING! Always check for obstacles in the mowing area before starting.

First-Time Setup

Power on the mower; adjust the cutting height as needed.

Set the cutting height: Use the lever to adjust to your desired height.
Check the grass collection bag: Ensure it is properly attached.
Test the mower: Start the mower and ensure it operates smoothly.

CAUTION! Always wear appropriate safety gear while operating the mower.

Specifications

Motor: 12-amp electric motor.
Cutting Deck: 20 inches.
Cutting Heights: Adjustable from 1 to 3 inches.
Grass Collection Bag: 14-gallon capacity.
Weight: 40 lbs.
Power Source: Electric, 120V.
Warranty: 2 years limited warranty.

Controls and Settings

Access controls on the handle for easy operation. The mower features a safety switch to prevent accidental starts.

Handle Controls: Power switch, height adjustment lever.

Ensure the safety switch is engaged before starting the mower.

Connecting Devices

This mower does not require any external devices for operation.

Ensure the power cord is connected to a grounded outlet.
Check for any extension cords if needed, ensuring they are rated for outdoor use.

Tip: Always use a GFCI outlet for safety when mowing outdoors.

Operating the Mower

Follow these steps to operate the mower effectively.

Start the mower: Engage the safety switch and press the power button.
Adjust speed: Use the throttle control if available.
Mow in straight lines: Overlap each pass for an even cut.
Stop the mower: Release the safety switch to turn off.

WARNING! Do not leave the mower unattended while running.

Maintenance

Regular maintenance is essential for optimal performance.

Clean the mower after each use: Remove grass clippings and debris.
Check the blades: Sharpen or replace as needed.
Inspect the power cord: Look for any signs of wear or damage.

CAUTION! Always unplug the mower before performing maintenance.

Safety Information

Read all safety instructions before operating the mower.

Wear appropriate footwear and eye protection.
Keep children and pets away from the mowing area.
Do not operate in wet conditions.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Mower won't start	Power supply issue	Check power cord and outlet.
Uneven cut	Blades dull	Sharpen or replace blades.
Grass clippings not collected	Bag full	Empty grass collection bag.
Excessive vibration	Loose parts	Tighten all screws and bolts.

Service: For further assistance, contact customer support.