Dewalt D25900 Demolition Hammer Manual

The Dewalt D25900 is a powerful demolition hammer designed for heavy-duty applications. It features a 15-amp motor that delivers 62 joules of impact energy, making it ideal for breaking through concrete and masonry. The hammer is equipped with a variable speed control, allowing for precise operation, and a durable design that ensures longevity. 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 Hammer 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 15-amp motor, variable speed control, durable housing, and ergonomic design.

Feature	Description
15-amp motor	Provides high power for tough demolition tasks
Variable speed control	Allows for precise operation based on material
Durable housing	Designed to withstand heavy use on job sites
Ergonomic design	Reduces user fatigue during extended use
Anti-vibration technology	Minimizes vibration for user comfort
Tool-free bit change	Quickly change bits without additional tools

Installation

Unpack and inspect contents. Ensure all components are included.

Choose a suitable work area with adequate ventilation.
Connect the power cord to a suitable outlet.
Attach the appropriate chisel or bit for your task.
Ensure all safety gear is worn before operation.

WARNING! Always wear safety goggles and gloves when operating the hammer.

First-Time Setup

Power on the hammer; familiarize yourself with controls and settings.

Adjust the speed setting based on the material being worked on.
Test the hammer on a scrap piece to ensure proper operation.
Review safety features and emergency shut-off procedures.

CAUTION! Ensure the work area is clear of obstacles before starting.

Specifications

Power: 15 amps.
Impact Energy: 62 joules.
Weight: 65 lbs.
Dimensions: 22 x 12 x 10 inches.
Vibration Control: Yes, with anti-vibration technology.
Bit Type: SDS Max.
Power Source: Electric.
Operating Temperature: Standard room temperature.

Controls and Settings

Access controls on the main body of the hammer. Key controls include power switch, speed dial, and bit release lever.

Safety Features: Includes overload protection and emergency shut-off.

Connecting Devices

Ensure the hammer is unplugged before making any connections.

Connect the power cord to a grounded outlet.
Attach the desired chisel or bit securely.
Check all connections before powering on.

Tip: Always inspect the power cord for damage before use.

Operating the Hammer

Follow these steps for effective operation:

Power on the hammer using the main switch.
Adjust the speed setting as needed.
Begin operation by applying the hammer to the material.
Maintain a steady pressure for optimal performance.

WARNING! Do not exceed the recommended operating limits.

Accessibility Features

Designed for ease of use with ergonomic grips and controls accessible for all users.

Care & Cleaning

Unplug before cleaning. Use a dry cloth to wipe down the exterior; avoid liquids.

CAUTION! Do not immerse in water or expose to moisture.

Regulatory Information

Meets all applicable safety standards for power tools. For support, visit www.dewalt.com or contact customer service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Hammer does not start	No power	Check power source and connections.
Excessive vibration	Worn components	Inspect and replace worn bits or chisels.
Overheating	Extended use	Allow to cool down; avoid prolonged operation.
Inconsistent performance	Improper bit	Ensure correct bit is used for the material.

Reset: If available, follow the reset procedure in the manual.

Service: For service inquiries, contact Dewalt customer support.