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Hitachi DH 20DV Cordless Hammer Drill User Manual
Quick guide for the Hitachi DH 20DV Cordless Hammer Drill. Includes battery charging, operation modes, bit installation, maintenance, and safety instructions.
PDF source: Deutsch · summary: English
Quick answers from the manual
Quick answer
- The Hitachi DH 20DV is a 24V cordless hammer drill. It features variable speed, SDS-plus shank compatibility, and two operation modes: 'Rotation + Striking' and 'Rotation only'. p. 1, 7
Key actions
- Charging the battery p. 10
- Mounting a drill bit p. 11
First start
- Charge the battery fully before first use. p. 10
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Problems and fixes
Pilot lamp flickers red
Check for foreign objects in the charger battery installation hole.
p. 11Maintenance and reset
- Allow the unit to cool for 15 minutes if it overheats during continuous use. p. 6, 11
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| No-load speed | 0 - 1150/min | Rotational speed | p. 7 |
| Concrete drilling capacity | 20 mm | Max hole diameter | p. 7 |
Where to find it in the PDF
- Battery and Charging p. 10
- Operation p. 11
Table of contents
Manual images
Click an image to enlargeQuick Guide
The Hitachi DH 20DV is a 24V cordless hammer drill designed for drilling in concrete, steel, and wood. It features variable speed control and two main operation modes: Rotation + Striking and Rotation only. Always charge the battery fully before first use and ensure the battery is inserted correctly into the charger.
Battery and Charging
To remove the battery, turn the unit upside down, pull the slide lever, and pull the battery out. To install, insert the battery until it clicks. When charging, connect the charger to a power outlet and insert the battery. The pilot lamp indicates the status: red blinking means charging, red solid means charging, and green solid indicates the battery temperature is too high for charging.
Operation
Mounting the drill bit: Pull the grip in the direction of the arrow, insert the SDS-plus drill bit as far as it will go, and release the grip to secure it.
Mode Selection: Use the change lever to align the mark with the desired mode. Select the 'Rotation + Striking' mode for concrete drilling or 'Rotation only' for steel or wood.
Switch Operation: The rotational speed is controlled by the trigger switch; pull slightly for low speed and further for higher speed.
Maintenance
Regularly inspect all mounting screws and tighten if loose. Keep the tool clean by wiping with a soft, dry cloth or soapy water. Do not use solvents. Store the tool in a dry place below 40°C. If the tool is used continuously, allow it to cool for approximately 15 minutes to prevent motor damage.
Specifications
- No-load speed: 0-1150/min
- No-load impact rate: 0-4400/min
- Concrete drilling capacity: 20 mm
- Charging time: Approx. 60 min (at 20°C)
- Battery: Ni-Cd 24V
Manufacturer information
Hitachi, Ltd.
Practical help
Common problems
Battery not charging
Check if the battery is inserted correctly, ensure there are no foreign objects in the charger, or allow the battery to cool if it was recently used.
Unit overheating
Stop using the tool for approximately 15 minutes to allow the motor and switch to cool down.
Drill bit stuck
For taper shank bits, use the cotter and a hammer to remove the bit from the adapter.
Before use
- Charge the battery fully before first use.
- Check for buried electric power cords in walls, floors, or ceilings.
- Ensure the drill bit is securely mounted.
- Wear ear protection during operation.
- Verify the correct operation mode is selected.
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Specs in practice
- No-load speed
- The rotational speed of the drill bit without resistance (0-1150/min).
- Charging time
- Approximate time to fully charge the battery at 20°C (60 min).
- Concrete capacity
- Maximum diameter of hole that can be drilled in concrete (20 mm).
Images and diagrams
- Fig 2-4: Battery removal and installation procedure.
- Fig 6: Mounting the SDS-plus drill bit.
- Fig 10: Changing between Rotation + Striking and Rotation only modes.
- Fig 12: Installing the optional drill chuck.
Model compatibility
- Use only the specified Hitachi charger (UC24YF).
- Use only genuine Hitachi replacement parts.
- Dust cup and dust collector are for concrete drilling only.
Manual page author
Emily Carter
User documentation editor