DeWalt DCMWSP550 Lawn Mower Manual

The DeWalt DCMWSP550 is a 20-inch cordless electric lawn mower powered by two 20V MAX* batteries (not included), featuring a brushless motor for extended runtime, 5-position single-lever height adjustment (1.5-4 inches), 2-in-1 mulching and rear bagging capability, foldable handle for compact storage, LED headlight for low-light conditions, and push-button start. 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 Settings 6. Operating the Mower 7. Maintenance & Care 8. Storage Guidelines 9. Safety Information 10. Warranty & Support 11. Troubleshooting

Features at a Glance

Key components: Brushless motor deck, foldable handle, battery ports, height adjustment lever, mulch plug, grass bag, safety key, and push-button start.

Feature	Description
Brushless Motor	Provides extended runtime and increased power efficiency
20V MAX* Battery System	Uses two 20V batteries (sold separately) for cordless operation
5-Position Height Adjustment	Single lever adjusts cutting height from 1.5 to 4 inches
2-in-1 Function	Mulch or bag grass clippings with included mulch plug and bag
Foldable Handle	Allows for compact storage in garages or sheds
LED Headlight	Illuminates cutting path in early morning or evening
Push-Button Start	No pull cord required; instant start with safety key
Safety Key	Prevents accidental starting; must be inserted to operate
Wheel Drive	Self-propelled option (if model includes) for easier maneuvering
Battery Fuel Gauge	Displays remaining battery charge on mower or battery pack

Assembly Instructions

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

Attach the handle: Align handle brackets with deck mounts, secure with provided bolts and wrench.
Install grass bag: Attach bag to rear discharge chute; ensure clips are secure.
Insert mulch plug (if mulching): Place plug into rear discharge opening.
Install batteries: Insert two fully charged 20V MAX* batteries into battery ports.
Attach safety key: Insert key into slot near start button.

WARNING! Ensure mower is turned off and batteries are removed during assembly to prevent accidental start.

First-Time Setup

Before first use, complete these steps for optimal performance.

Charge batteries: Use DeWalt 20V MAX* charger to fully charge both batteries.
Adjust cutting height: Set lever to desired height (recommend 3 inches for initial mow).
Select mode: Install mulch plug for mulching or attach bag for collection.
Test operation: In a clear area, insert safety key, press start button to ensure mower runs smoothly.

CAUTION! Clear mowing area of debris, stones, and toys before operation.

Specifications

Cutting Width: 20 inches.
Cutting Height Range: 1.5 - 4 inches (5 positions).
Power Source: Two 20V MAX* Lithium-Ion batteries (not included).
Motor Type: Brushless for longer life and efficiency.
Deck Material: Steel with corrosion-resistant coating.
Bag Capacity: 1.8 bushels (approx.).
Weight: 55 lbs (without batteries).
Warranty: 3-year limited warranty.
Noise Level: Less than 75 dB (quieter than gas mowers).

Controls and Settings

Main controls located on handle: Start/Stop button, height adjustment lever, battery indicators.

Handle Controls: START/STOP button, safety key slot, battery fuel gauge lights. Deck Features: Height adjustment lever, mulch plug slot, bag attachment hooks. Settings: Height adjustment (1.5, 2, 2.5, 3, 4 inches), mulching vs. bagging mode selection.

Operating the Mower

Follow these steps for safe and effective mowing.

Insert safety key into slot near start button.
Press and hold start button; mower will begin operation.
Adjust speed via variable-speed control (if equipped).
To stop, release start button; remove safety key when not in use.
Empty grass bag when full; check battery level via indicator lights.

Tip: Mow when grass is dry for best results; overlap passes slightly for even cut.

Maintenance & Care

Regular maintenance ensures longevity and performance.

After each use: Clean underside of deck to prevent grass buildup.
Blade care: Inspect blade monthly for damage; sharpen or replace as needed.
Battery care: Store batteries in cool, dry place; charge fully before storage.
Wheel maintenance: Check wheels for debris; tighten bolts if loose.

WARNING! Always remove batteries before performing any maintenance.

Storage Guidelines

Proper storage extends mower life.

Fold handle: Lower handle to compact position for storage.
Remove batteries: Store separately in climate-controlled area.
Clean mower: Remove all grass and debris from deck and wheels.
Store indoors: Keep in dry location, protected from elements.

CAUTION! Do not store with batteries inserted; avoid extreme temperatures.

Safety Information

Read all safety instructions before use.

Wear safety glasses, long pants, and sturdy shoes while mowing.
Keep bystanders, especially children and pets, away from mowing area.
Do not mow on steep slopes or wet grass to prevent slipping.
Never remove safety key while blades are moving.
Use only DeWalt 20V MAX* batteries and charger.

DANGER! Keep hands and feet away from moving blades; never lift mower while running.

Warranty & Support

DeWalt DCMWSP550 comes with a 3-year limited warranty covering defects in materials and workmanship. Warranty does not cover normal wear, misuse, or use of non-DeWalt batteries. For support, visit www.dewalt.com or contact DeWalt Customer Service at 1-800-433-9258. Register your product online for faster service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Mower won't start	Safety key not inserted, dead batteries	Insert safety key fully; charge or replace batteries.
Poor cutting performance	Dull blade, low battery, wet grass	Sharpen or replace blade; charge batteries; mow when grass is dry.
Uneven cut	Uneven tire pressure, incorrect height setting	Check tire pressure; adjust cutting height evenly on all wheels.
Bag not filling	Clogged chute, wet grass	Turn off mower, clear chute; ensure grass is dry.
Battery draining quickly	Old batteries, high grass, extreme conditions	Use new DeWalt batteries; mow more frequently; avoid very thick grass.

Reset: Remove batteries for 30 seconds, then reinsert to reset electronics.

Service: 1-800-433-9258; www.dewalt.com