DeWalt XR DCMWSP156 Lawn Mower Manual

The DeWalt XR DCMWSP156 is a 20-inch cordless electric lawn mower powered by a 20V MAX* or 60V MAX FLEXVOLT battery system. It features a brushless motor for increased runtime and durability, a 3-in-1 capability (mulch, bag, side discharge), a single-lever height adjustment for 7 cutting positions (1.5" to 4"), a folding handle for easy storage, and a push-button start. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Assembly & Setup 3. First-Time Operation 4. Specifications 5. Controls and Settings 6. Battery & Charging 7. Mowing Operations 8. Maintenance & Storage 10. Safety Information 11. Warranty & Support 12. Troubleshooting

Features at a Glance

Key components: Deck with brushless motor, folding handle, battery port, height adjustment lever, 3-in-1 rear bag/chute, safety key, and push start button.

Feature	Description
Power Source	20V MAX* / 60V MAX FLEXVOLT Battery (not included)
Cutting Width	20 inches
Cutting Height	7 positions (1.5" to 4")
3-in-1 Function	Mulch, Bag, or Side Discharge
Motor Type	Brushless for efficiency and longer life
Start System	Push-button electric start
Handle	Folding for compact storage
Deck Material	Steel with corrosion-resistant finish
Safety Key	Removable key to prevent accidental start
Wheels	8-inch rear, 7-inch front for easy maneuverability

Assembly & Setup

Unpack all parts. Assemble on a flat, clear surface.

Attach the lower handle: Secure to deck using provided bolts and wrench.
Attach the upper handle: Connect to lower handle, secure knobs.
Install the grass bag or mulch plug: Attach to rear chute as desired.
Install wheels: Slide axles through deck brackets, secure with washers and pins.
Adjust cutting height: Set lever to desired position before first use.

WARNING! Ensure mower is powered OFF and battery is removed during assembly. Tighten all fasteners securely.

First-Time Operation

Before first mow, ensure proper assembly and battery charge.

Charge battery: Use DeWalt charger (not included) until fully charged.
Insert battery and safety key: Install compatible battery into port, insert safety key.
Select cutting mode: Install mulch plug, bag, or attach side discharge chute.
Adjust cutting height: Use single lever to set height for your lawn.
Start mower: Press and hold safety handle, then press start button.

CAUTION! Clear mowing area of debris, stones, and toys. Wear appropriate safety gear.

Specifications

Model: DeWalt XR DCMWSP156
Cutting Width: 20 inches
Cutting Height Range: 1.5 - 4 inches (7 positions)
Power System: 20V MAX* / 60V MAX FLEXVOLT Battery
Motor: Brushless
Deck Construction: Steel
Wheels: 8" rear, 7" front
Weight (without battery): Approx. 65 lbs
Collection Bag Capacity: 1.9 bushels
Noise Level: Significantly lower than gas mowers

Controls and Settings

Main Controls: Safety handle/bar, Start button, Battery release button, Height adjustment lever, Bag release handle.

Operation: Press and hold safety handle to engage motor circuit, then press start button. Release safety handle to stop blade.

Height Adjustment: Single lever adjusts all four wheels simultaneously through 7 positions. 3-in-1 Selector: Install mulch plug for recycling clippings, attach bag for collection, or attach side discharge chute for directing clippings.

Battery & Charging

Compatible with DeWalt 20V MAX* and 60V MAX FLEXVOLT batteries. Charger sold separately.

Charging: Use only DeWalt chargers. Insert battery into charger; LED indicates status.
Runtime: Varies based on battery capacity, grass condition, and height setting.
Storage: Remove battery for long-term storage. Store in cool, dry place.
Battery Care: Avoid complete discharge. Charge at room temperature.

Tip: For best performance, use a high-capacity DeWalt battery (e.g., 9.0Ah or higher).

Mowing Operations

For optimal results and safety, follow these procedures.

Pre-mow check: Clear area, check battery level, ensure bag/mulch plug is secure.
Starting: Insert safety key, install battery, hold safety handle, press start button.
Mowing pattern: Overlap passes slightly for even cut. Avoid mowing when grass is wet.
Emptying bag: Stop mower, remove safety key. Lift bag release handle to detach and empty.
Switching modes: Stop mower completely before changing between mulch, bag, or side discharge.
Stopping: Release safety handle. Remove safety key when not in use.

WARNING! Never operate without the grass bag, mulch plug, or discharge chute properly installed. Keep hands and feet away from cutting area.

Maintenance & Storage

Regular maintenance ensures longevity and performance.

After Each Use: Clean underside of deck (with mower OFF and battery removed). Empty and clean grass bag. Check blade for damage.

Seasonal/Periodic: Sharpen or replace blade as needed. Check all bolts and fasteners for tightness. Lubricate wheel axles if necessary.

Storage: Fold handle, remove battery, store in a dry place. Charge battery to 50% for long-term storage.

Safety Information

Read and understand all instructions before use. Always wear safety glasses, long pants, and sturdy shoes.

General Safety: Do not mow in rain or on wet grass. Do not allow children to operate. Be aware of your surroundings, especially when mowing backwards or on slopes. Never remove safety key while blade is moving.

Electrical Safety: Use only DeWalt batteries and chargers. Do not expose battery to fire or excessive heat. Do not pierce or damage battery.

Warranty & Support

DeWalt offers a limited warranty for this product. Proof of purchase is required.

Warranty: 3-year limited warranty on mower, 2-year on battery, 1-year on charger (subject to terms and conditions).

Support: For technical support, replacement parts, or to locate a service center, visit www.dewalt.com or call 1-800-4-DeWalt (1-800-433-9258).

Troubleshooting

Symptom	Possible Cause	Corrective Action
Mower won't start	Safety key not inserted, dead battery, safety handle not engaged	Insert safety key, charge or replace battery, fully depress safety handle.
Poor cutting performance	Dull blade, low battery, cutting height too low	Sharpen or replace blade, charge battery, raise cutting height.
Uneven cut	Deck clogged, uneven tire pressure, worn blade	Clean deck underside, check tires, balance or replace blade.
Bag not filling	Wet grass, clogged chute, full bag	Mow when grass is dry, clear chute, empty bag frequently.
Excessive vibration	Damaged or unbalanced blade, loose parts	Stop mower immediately. Inspect and tighten all fasteners. Replace blade if damaged.

Reset: For electrical issues, remove battery and safety key for 60 seconds, then reinstall.

Service: For repairs not covered in this manual, contact DeWalt authorized service.