Introduction
The BOSCH 11255VSR Bulldog Xtreme 8 Amp 1 Inch Corded Variable Speed SDS-Plus Concrete/Masonry Rotary Hammer is engineered for demanding drilling and hammering tasks. This manual provides essential information for safe and effective operation, maintenance, and understanding of its features.
Image: The BOSCH 11255VSR Bulldog Xtreme Rotary Hammer, a powerful tool designed for concrete and masonry work.
Key Features
- 3 Modes of Operation: Multi-function selector allows quick shifts between rotation-only, rotary hammer, and hammer-only modes for versatile applications.
- Variable Speed Trigger with Reverse: Provides accurate bit starting and easy removal of fasteners or bound bits.
- Vario-Lock Positioning: Rotates and locks the chisel into 36 different positions to optimize the working angle for various tasks.
- Patented Rotating Brush Plate: Ensures equal power delivery in both forward and reverse operations, enhancing tool longevity.
- SDS-Plus Bit System: Facilitates tool-free bit changes with automatic bit locking, dust protection, and maximum impact energy transfer.
- Integral Clutch: Minimizes torque reaction by disengaging power transmission if the bit binds during operation.
- D-Handle Design: Offers a comfortable and ergonomic grip for greater control, especially during overhead or downward drilling.
- Cord Turret: Features a 35-degree pivot for added flexibility and extended cord life.
Image: Diagram highlighting key features of the BOSCH 11255VSR, including the integral clutch, variable speed, Vario-Lock positioning, and multi-function selector.
Setup
Attaching the Auxiliary Handle
The auxiliary D-handle provides enhanced control and comfort. To attach, loosen the handle clamp, slide it over the tool's barrel, position it as desired, and tighten the clamp securely. Ensure the handle is firm before operation.
Image: The BOSCH 11255VSR rotary hammer with its auxiliary D-handle attached, providing additional grip and control.
Inserting SDS-Plus Bits
- Clean the SDS-Plus bit shank.
- Pull back the chuck collar on the rotary hammer.
- Insert the bit into the chuck until it clicks into place.
- Release the chuck collar. Pull on the bit to ensure it is securely locked. A slight amount of play is normal for SDS-Plus systems.
Image: The BOSCH 11255VSR with an SDS-Plus drill bit inserted and the depth gauge extended, ready for precise drilling.
Setting the Depth Gauge
Insert the depth gauge into the auxiliary handle. Adjust the gauge to the desired drilling depth by sliding it in or out. Tighten the auxiliary handle clamp to secure the depth gauge in position.
Operating
Selecting Operation Mode
The multi-function selector allows you to choose between three modes:
- Rotation Only: For drilling in wood, metal, or plastic without hammering action.
- Rotary Hammer: For drilling in concrete, masonry, and stone with both rotation and hammering action.
- Hammer Only: For chiseling, chipping, or demolition work without rotation.
To change modes, push the red button on the selector switch and rotate it to the desired setting. Ensure the switch locks into place.
Image: Visual representation of the three available modes: Rotary Only, Rotary Hammer, and Hammer Only.
Variable Speed Trigger and Reverse
The variable speed trigger allows for precise control over drilling speed. Apply less pressure for slower speeds and more pressure for higher speeds. The reverse switch, typically located near the trigger, changes the direction of rotation for removing fasteners or freeing bound bits.
Image: Close-up of the variable speed trigger on the BOSCH 11255VSR, indicating its function for speed control.
Vario-Lock Positioning for Chiseling
When in Hammer Only mode, the Vario-Lock feature allows you to rotate and lock the chisel bit into 36 different positions. This optimizes the working angle for various chiseling tasks, improving efficiency and user comfort.
Image: Illustration of the Vario-Lock Positioning feature on the BOSCH 11255VSR, showing how the chisel bit can be rotated and locked.
Overhead and Downward Drilling
The D-handle design and balanced weight distribution make the 11255VSR suitable for both overhead and downward drilling applications, providing enhanced control and reducing fatigue.
Image: A user demonstrating the BOSCH 11255VSR in an overhead drilling application, highlighting its ergonomic design.
Maintenance
- Regularly clean the tool's exterior with a soft, damp cloth.
- Inspect the power cord for any damage before each use.
- Keep the SDS-Plus chuck clean and lubricated to ensure smooth bit changes and optimal performance.
- Check carbon brushes periodically and replace them if worn (refer to service manual for specific instructions).
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start | No power supply; damaged cord; faulty switch. | Check power connection; inspect cord; contact service for switch replacement. |
| Bit binds during operation | Excessive pressure; hitting rebar; dull bit. | Reduce pressure; use appropriate bit for material; replace bit. The integral clutch should disengage torque. |
| Reduced hammering action | Worn carbon brushes; insufficient lubrication; clogged chuck. | Inspect/replace brushes; lubricate chuck; clean chuck thoroughly. |
Specifications
| Specification | Value |
|---|---|
| Brand | Bosch |
| Model Number | 11255VSR |
| Power Source | Corded Electric |
| Amperage | 7.5 Amps |
| Maximum Rotational Speed | 1300 RPM |
| Impact Energy | 2.0 ft-lbs |
| Blows Per Minute (BPM) | 0-5800 BPM |
| Chuck Type | SDS-Plus |
| Item Weight | 10.4 Pounds |
| Product Dimensions | 22.5"L x 11.25"W x 4.75"H |
| Included Components | Rotary Hammer, Auxiliary Handle, Depth Gauge, Carrying Case |
Official Product Video
Video: An official product overview of the Bosch 11255VSR Bulldog Xtreme, demonstrating its features and capabilities.
Warranty
The BOSCH 11255VSR Bulldog Xtreme Rotary Hammer comes with a 1 Year Repair or Replacement of Parts warranty. For detailed terms and conditions, please refer to the official Bosch warranty documentation or visit the Bosch website.
Image: The BOSCH 11255VSR featuring its integrated hammer hook for convenient tool storage during work.
Support
For further assistance, technical support, or service inquiries regarding your BOSCH 11255VSR Bulldog Xtreme Rotary Hammer, please contact Bosch Customer Service. Refer to the product packaging or the official Bosch website for the most current contact information.