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Black & Decker MM850 User Manual

Black & Decker MM850
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MM850
19” (483 mm) Convertible Mulching•Rear Bag Mower
Déchiqueteuse convertible • Tondeuse à sac arrière de
483 mm (19 po)
Podadora convertible de 483 mm (19”) con bolsa trasera
Instruction Manual
Guide d’utilisation
Manual de instrucciones
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Black & Decker MM850 Specifications

General IconGeneral
TypeElectric Lawn Mower
Power SourceCorded Electric
Voltage120V
Height AdjustmentSingle Lever
MulchingYes
BaggingYes
Side DischargeNo
Warranty2 years
Amperage12A
Cutting Width19 inches
Grass CollectionRear

Summary

Important Safety Instructions

Know Your Mower

Learn mower controls and proper use for safe operation.

Avoid Dangerous Environment

Do not use mower in rain, damp, or explosive atmospheres.

Use Protective Equipment

Wear safety glasses or goggles while mowing.

Keep Guards and Shields in Place

Ensure guards and shields are in place and working.

Guard Against Electric Shock

Repair or replace damaged cords; knot cords to prevent disconnection.

Keep Away From Blade Area

Keep hands/feet away from blade; do not remove cut material with blade moving.

Disconnect Lawnmower

Unplug mower when not in use, before adjustments, servicing, or cleaning.

Keep Children Away

Keep visitors, especially children, at a safe distance from the work area.

Store Idle Lawnmower Indoors

Store mower indoors in a dry, locked place out of children's reach.

Don't Force the Mower

Use mower at its designed rate for better and safer performance.

Use Right Tool

Use the tool only for its intended purpose.

Dress Properly

Avoid loose clothing/jewelry; wear rubber gloves and footwear.

Don't Abuse Cord

Never pull mower by cord; keep cord from heat, oil, and sharp edges.

Warning - Electric Shock Hazard

Use outdoor-suitable extension cords; connect to fused line or circuit breaker.

Don't Overreach

Maintain proper footing and balance at all times.

Maintain Lawnmower With Care

Keep blade sharp, clean; inspect cords; keep handles dry.

Avoid Accidental Starting

Ensure switch is off before plugging in.

Objects Struck by Blade

Clear area of objects before mowing to prevent injuries.

If Mower Strikes Foreign Object

Turn off, unplug, inspect for damage, and repair before restarting.

Use Identical Replacement Blades

Always use identical replacement blades for safety and performance.

When Servicing

Use only identical replacement parts when servicing.

Ground Fault Circuit Interrupter (GFCI)

Use GFCI protection for circuit/outlet used with lawnmower.

Additional Safety Instructions

Read Manual Carefully

Be thoroughly familiar with controls and proper use of the equipment.

Keep Children Away

Never allow children to operate the power mower.

Clear Area of Persons and Pets

Keep the operation area clear of all persons, especially children and pets.

Inspect Area for Debris

Remove stones, sticks, wires, bones, and other objects before mowing.

Wear Footwear

Do not operate barefoot or in open sandals; wear substantial footwear.

Adjust Height When Off

Never adjust wheel height while the motor is running or mower is plugged in.

Mow in Daylight

Mow only in daylight or in good artificial light.

Avoid Wet Grass

Never operate in wet grass; maintain good footing and balance.

Keep Clear of Rotating Parts

Do not put hands or feet near or under rotating parts; keep clear of discharge opening.

Turn Off on Surfaces

Release switch to turn mower off when crossing gravel drives, walks, or roads.

Unclog Chute Safely

Turn off, wait for blade stop, unplug to unclog chute or remove debris.

Inspect After Striking Object

Turn off, unplug after striking object; inspect for damage and repair.

Check If Vibrating Abnormally

If mower vibrates abnormally, turn off, unplug, and check for cause.

Turn Off When Leaving

Turn off and unplug mower whenever leaving it unattended, even briefly.

Stop Moving Parts Before Servicing

Ensure blade and moving parts have stopped before cleaning or repairs.

Stop Blade Before Removing

Shut off motor, wait for blade stop, unplug before removing grass catcher or unclogging chute.

Mow Across Slopes

Mow across slopes, not up/down; use caution when changing direction.

Use Proper Guards

Never operate without proper guards, plates, or safety devices in place.

Maintenance

Safety Before Maintenance

Ensure switch is off, blade stopped, and cord unplugged before maintenance.

Check Blade Tightness

Check blade at frequent intervals for proper tightness.

Keep Fasteners Tight

Keep all nuts, bolts, and screws tight for safe working condition.

Check Grass Catcher Wear

Check grass catcher for wear or deterioration; replace if excessively worn.

Double Insulation

Polarized Plug

Extension Cords

Extension Cord Suitability

Use only outdoor-suitable extension cords with adequate wire size for safety.

Minimum Gauge for Cord Sets

Attaching Extension Cord to Mower

Step 1: Polarized Plug

Read polarized plug section and orient wide slot with wide blade.

Step 2: Loop Cord

Loop extension cord and push up through the hole in the switch housing.

Step 3: Remove Slack

Pull cord on loop side to remove slack in the switch housing section.

Step 4: Secure Loop

Place loop over strain relief tab and pull cord to secure.

Unpacking

Remove Packaging

Remove grassbag frame, assembly, and cardboard fillers.

Position Mower

Remove mower from carton and place all four wheels on the ground.

Check for Loose Parts

Check carton thoroughly to ensure no loose parts remain.

To Unfold Handle

Secure Handle

Raise handle section, secure by tightening the two knobs.

To Assemble Grassbag

Wheel Height Adjustment

Safety Before Adjustment

Turn off, unplug mower, and wait for blade to stop before adjusting.

One Touch System

Mower features one touch wheel height adjustment for all four wheels.

Adjusting Cutting Height

Use finger grip to raise or lower height; check scale and pointer for setting.

Switch Operation

Operating the Switch

Insert finger, push lever out, pull back to turn on; release to turn off.

Caution on Switch Override

Never attempt to override the operation of this switch.

Safety Shield & Rear Door

Purpose of Safety Shield

Shield minimizes throwing of objects; do not operate without it.

Rear Door Spring Tension

Do not operate if rear door is not under spring tension; seek repair.

Operation with Attachments

Do not use mower without grasscatcher or mulch insert in operating position.

Mowing Procedure

Inspect Mowing Area

Remove all stones, sticks, wire, bones, and other debris before mowing.

Manage Extension Cord

Place cord close to outlet, out of mower's path; do not plug in wet.

Mowing Pattern

Begin mowing near outlet, move back and forth, keeping cord on cut lawn.

Other Mowing Tips

Mow Across Slopes

Mow across slopes, not up/down; use caution when changing direction.

Turn Off on Surfaces

Turn off mower when crossing gravel areas; stones can be thrown by blade.

Adjust Height for Tall Grass

Set mower at highest cutting height for rough ground or tall weed.

Clear Blade Area

Turn off, unplug, and clean blade area of grass clippings.

Check for Abnormal Vibration

Turn off, unplug if mower vibrates abnormally; check for cause.

Turn Off When Unattended

Always turn off and unplug mower when leaving it unattended.

Mulching

Mulching Design

Mower re-cuts clippings into small pieces that disperse into lawn.

Mulch Insert

Mower shipped with Mulch Insert installed; see manual for removal.

Mulching Mowing Tips

Keep Housing Clean

Keep mower housing free of built-up grass and trash; clean after each use.

Avoid Wet Grass

Avoid cutting wet grass as it forms clumps and interferes with mulching.

Best Mowing Time

Mow in early afternoon when grass is dried for best results.

Adjust Cutting Height

Cut only the top third of grass blades; adjust for overgrown grass.

Heavy Mulching

For heavy mulching, make narrower cuts and mow slowly.

Removing Mulch Insert

Safety Before Removal

Shut off mower, wait for blade stop, unplug mower.

Access Mulch Insert

Raise rear discharge door, locate hand in handle pocket, lift and pull out insert.

Installing Mulch Insert

Steps for Removal

Repeat steps 1 and 2 for removing mulch insert.

Insert Mulch Insert

Slide mulch insert into discharge opening until firmly in contact with deck.

Installing Grass Catcher

Raise Rear Discharge Door

Raise rear discharge door to vertical position and hold up.

Position Grass Catcher

Lower grass catcher by handle and position hooks on mower.

Warning on Operation

Never operate unless hooks are seated and door rests against catcher.

Blade Sharpening

Frequency of Sharpening

Sharpen blade twice per season; more often if lawn has sandy soil.

Replace Damaged Blade

Replace bent or damaged blade immediately.

Sharpening Process

Ensure blade is balanced; sharpen at original angle, equal amounts from ends.

Sharpening in a Vise

Secure blade in vise, wear safety glasses, and carefully file cutting edges.

Blade Balancing

Check balance by placing center hole over nail/screwdriver; file end that drops.

Removing and Attaching Blades

Safety First

Release switch, wait for blade stop, unplug mower before proceeding.

Use Wood Block

Cut 2x4 wood to keep blade from turning while removing blade nut.

Remove Blade Nut

Position wood, wear gloves, and remove nut as shown in figure.

Remove Blade Components

Remove lower blade spacer, insulator washer, and blade.

Install New Blade

Place insulator washer, spacer, and nut on shaft; align flats.

Secure Blade Nut

Position wood to keep shaft from turning, then securely tighten blade nut.

Lubrication

Cleaning

Safety Before Cleaning

Turn off, let blade stop, and unplug mower before cleaning.

Cleaning Method

Use mild soap and damp cloth; clean accumulated clippings from deck.

Check Fasteners

After several uses, check all exposed fasteners for tightness.

Preventing Corrosion

Fertilizer/Chemical Impact

Fertilizers/chemicals accelerate corrosion; clean mower after use in such areas.

Cleaning After Chemical Use

Wipe all exposed parts with a damp cloth after using chemicals.

Caution on Water Spray

Do not pour or spray water on the mower for cleaning.

Storage Near Chemicals

Do not store mower near fertilizers or chemicals to prevent corrosion.

Storage

Important Information

Product Safety and Reliability

Repairs, maintenance, and adjustments should be done by qualified service centers.

Home Use Warranty

Full two-year warranty on mower, five-year on plastic deck.

30-Day No-Risk Try Out

Return product within 30 days for a full refund if not completely satisfied.

Consumer Help Line

Call 1-800-762-6672 for assistance with questions or difficulties.

Accessories

Recommended Accessories

Accessories are recommended; using others may be hazardous.

Replacement Grassbag

MC-1000 is available as a replacement grassbag.

Replacement Blade

MB-850 is available as a replacement blade.

Locating Service Centers

A complete listing of service centers is included in the manual.

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