1. Introduction
Thank you for choosing the Hitachi DH 45 MR SDS-Max Rotary Hammer. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your tool. Please read this manual thoroughly before use and keep it for future reference. Proper use and care will ensure long-lasting performance and safety.
2. Safety Instructions
Always observe basic safety precautions to reduce the risk of fire, electric shock, and personal injury. Keep this manual handy for quick reference.
- Work Area Safety: Keep the work area clean and well-lit. Cluttered or dark areas invite accidents. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust.
- Electrical Safety: Power tool plugs must match the outlet. Never modify the plug in any way. Do not abuse the cord. Never use the cord for carrying, pulling, or unplugging the power tool. Keep cord away from heat, oil, sharp edges, or moving parts.
- Personal Safety: Always wear eye protection. Use hearing protection when operating the tool for extended periods. Wear appropriate clothing; avoid loose clothing or jewelry. Secure long hair.
- Tool Use and Care: Do not force the power tool. Use the correct power tool for your application. Disconnect the plug from the power source before making any adjustments, changing accessories, or storing power tools.
- Vibration: This tool produces vibration during operation. Prolonged exposure to vibration may cause hand-arm vibration syndrome. Use anti-vibration gloves and take regular breaks.
3. Product Overview
The Hitachi DH 45 MR is a robust SDS-Max rotary hammer designed for heavy-duty drilling and chiseling tasks in concrete and masonry. It features a powerful motor and a pneumatic mechanism for high impact energy.
Figure 1: Hitachi DH 45 MR SDS-Max Rotary Hammer in operation. This image shows the tool being used to create a large diameter hole in a wall, highlighting its application for heavy-duty tasks. The operator is wearing protective gloves, demonstrating safe handling practices.
Key Features:
- SDS-Max Tool Holder: For quick and secure bit changes.
- 15.5 J Pneumatic Mechanism: Delivers high impact energy for efficient drilling and chiseling.
- Safety Slip Clutch: Protects the user and the tool in case of bit jamming.
- Constant Electronics: Maintains uniform speed under load for consistent performance.
- Soft Grip: Enhances user comfort and control during operation.
- Included Accessories: Speed limiter, side handle, grease, and a carrying case for convenience.
4. Setup
Before operating the rotary hammer, ensure it is properly set up and all accessories are securely attached.
4.1 Attaching the Side Handle
- Loosen the side handle clamp by rotating it counter-clockwise.
- Slide the side handle onto the tool's barrel until it reaches the desired position.
- Rotate the clamp clockwise to securely tighten the handle. Ensure it is firm and does not rotate freely.
4.2 Installing SDS-Max Bits
- Clean the shank of the SDS-Max bit and apply a small amount of the supplied grease to it.
- Insert the bit into the tool holder, pushing and rotating it until it clicks into place.
- Pull the bit to ensure it is securely locked. There will be a slight axial play, which is normal for SDS-Max systems.
- To remove the bit, pull back the locking sleeve on the tool holder and pull the bit out.
4.3 Connecting to Power
Ensure the power switch is in the OFF position before plugging the tool into a suitable 240V AC power outlet. Verify that the power supply matches the specifications on the tool's nameplate.
5. Operating Instructions
The Hitachi DH 45 MR offers multiple operating modes for various applications.
5.1 Mode Selection
The tool features a mode selector switch to choose between:
- Rotary Hammer Mode: For drilling in concrete, masonry, and stone with impact.
- Hammer Only Mode (Chiseling): For chiseling, demolition, and breaking work.
Rotate the mode selector to the desired symbol before starting the tool. Never change modes while the tool is running.
5.2 Speed Control
The tool features variable speed control, allowing adjustment of the rotational speed and impact rate. Use lower speeds for starting holes or when working with delicate materials, and higher speeds for maximum efficiency in tough materials.
5.3 Drilling and Chiseling
- Ensure the correct bit is installed and the mode selector is set.
- Hold the tool firmly with both hands, using the main handle and the side handle for maximum control.
- Position the bit at the desired drilling or chiseling point.
- Press the trigger switch to start the tool. Apply steady, firm pressure. Do not force the tool; let the hammer mechanism do the work.
- For drilling, maintain a straight angle to the workpiece. For chiseling, guide the chisel along the desired line.
- Release the trigger switch to stop the tool.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Hitachi DH 45 MR rotary hammer. Always disconnect the tool from the power supply before performing any maintenance.
- Cleaning: After each use, clean the tool's exterior with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Keep ventilation openings clear of dust and debris.
- Tool Holder Maintenance: Regularly clean the SDS-Max tool holder and apply a small amount of the supplied grease to the bit shank and inside the tool holder to ensure smooth operation and prevent wear.
- Carbon Brushes: The carbon brushes are wear parts. If the motor performance decreases or sparks become excessive, have the carbon brushes inspected and replaced by an authorized service center.
- Power Cord: Regularly inspect the power cord for damage. If damaged, have it replaced by an authorized service technician to avoid electrical hazards.
- Storage: Store the tool in its carrying case in a dry, secure place, out of reach of children.
7. Troubleshooting
If you encounter issues with your rotary hammer, refer to the following common problems and solutions. For more complex issues, contact an authorized service center.
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start | No power supply; Damaged power cord; Faulty switch | Check power connection; Inspect cord for damage; Contact service center for switch replacement |
| Low impact power | Worn carbon brushes; Insufficient lubrication; Incorrect mode selection | Have brushes checked/replaced; Apply grease to bit shank; Ensure correct mode is selected |
| Bit not locking in holder | Dirty bit shank; Damaged tool holder; Incorrect bit type | Clean bit shank and apply grease; Inspect tool holder for damage; Ensure SDS-Max bit is used |
| Excessive vibration | Worn internal components; Bent bit | Contact service center for inspection; Replace bent bit |
8. Specifications
Technical data for the Hitachi DH 45 MR SDS-Max Rotary Hammer.
| Specification | Value |
|---|---|
| Brand | Hitachi |
| Model Number | DH 45 MR |
| Power Source | Corded Electric |
| Voltage | 240 Volts |
| Max Power Input | 1200 Watts |
| Impact Energy | 0-15.5 Joules |
| No-Load Speed | 120-240 rpm |
| Full-Load Impact Rate | 1200-2500 bpm |
| Max Drilling Diameter in Concrete | 45 mm |
| Max Drilling Diameter in Concrete (Core Bits) | 125 mm |
| Item Weight | 8.0 kg |
| Dimensions (L x W x H) | 500 mm x 108 mm x 270 mm |
| Tool Holder | SDS-Max |
| Material | Duralumin |
| Color | Silver |
| ASIN | B001CSVBE8 |
| GTIN | 04966376134649 |
9. Warranty and Support
Hitachi is committed to providing high-quality tools and customer support.
9.1 Warranty Information
This product comes with a standard warranty. You may be eligible for a free 3-year warranty extension upon registration of your product on the official Hitachi website. Please refer to the Hitachi website for specific terms and conditions regarding warranty registration and coverage.
9.2 Spare Parts Availability
Spare parts for this model are available in the EU for a period of 3 years from the date of purchase. For genuine spare parts and authorized service, please contact your local Hitachi dealer or service center.
9.3 Customer Support
For technical assistance, service inquiries, or to locate an authorized service center, please visit the official Hitachi website or contact their customer support line. Always provide the model number (DH 45 MR) and ASIN (B001CSVBE8) when seeking support.
