BOSCH RH850VC SDS-max 1-7/8 In. Combination Hammer Instruction Manual

1. Introduction

This manual provides essential information for the safe and effective operation, maintenance, and care of your BOSCH RH850VC SDS-max 1-7/8 In. Combination Hammer. Please read all instructions carefully before using the tool to ensure proper function and to prevent injury.

Image 1.1: The BOSCH RH850VC SDS-max 1-7/8 In. Combination Hammer.

2. Safety Instructions

Always observe basic safety precautions to reduce the risk of fire, electric shock, and personal injury when operating power tools. Keep this manual for future reference.

General Safety Warnings:

• 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 use any adapter plugs with earthed (grounded) power tools. Avoid body contact with earthed or grounded surfaces.
• Personal Safety: Always wear eye protection. Use hearing protection when operating the tool for extended periods. Wear a dust mask in dusty conditions. Dress properly; avoid loose clothing or jewelry.
• 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 Control: This tool features vibration control. However, prolonged use can still cause vibration-related injuries. Take regular breaks and use appropriate personal protective equipment.

3. Key Features

The BOSCH RH850VC Combination Hammer is designed with several features to enhance performance and user comfort:

• Powerful 14.5-Amp Motor: Delivers 9.3 ft.-lbs. of impact energy.
• Vibration Control: Engineered for maximum user comfort during extended operation.
• Dual-Mode Selector: Allows selection between Rotary Hammer mode and Hammer-Only mode.
• Constant Response Circuitry: Provides soft-start, maintains constant speed under load, and offers overload protection.
• Electro-Pneumatic Impact System: Maximizes impact force while minimizing vibration.
• SDS-max Bit System: Enables tool-free bit changes with automatic bit locking, dust protection, and efficient impact energy transfer.
• Variable-Speed Dial: For accurate bit starting and controlled chipping applications.
• Padded Rear Handle: Absorbs shock for enhanced operator comfort.
• Integral Clutch: Helps minimize torque reaction in case of bit bind-up.
• Turbo Power Feature: Provides a 20 percent power boost in Hammer-Only mode.

Image 3.1: Key features of the RH850VC, including Turbo Power, Vibration Control, Padded Rear Handle, Constant Response Circuitry, and Variable-Speed Dial.

4. Components Overview

Familiarize yourself with the main components of your BOSCH RH850VC Combination Hammer:

• SDS-max Chuck
• Side Handle
• Depth Gauge (if included)
• Mode Selector Switch
• Variable Speed Dial
• Trigger Switch
• Main Handle (Padded Rear Handle)
• Power Cord

Image 4.1: Side view of the RH850VC, showing the main body and handles.

5. Setup

Attaching the Side Handle:

1. Loosen the side handle clamp by turning it counter-clockwise.
2. Slide the side handle onto the tool's barrel.
3. Adjust the handle to a comfortable and secure position.
4. Tighten the clamp by turning it clockwise until the handle is firmly secured.

Inserting SDS-max Bits:

1. Clean the shank of the SDS-max bit and apply a thin layer of grease to the bit shank.
2. Push the bit into the chuck until it locks into place. You should feel a slight resistance and then a click.
3. Pull on the bit to ensure it is securely locked. The SDS-max system allows for slight axial movement of the bit, which is normal.

Removing SDS-max Bits:

1. Pull back the chuck sleeve.
2. Remove the bit.
3. Release the chuck sleeve.

6. Operating Instructions

Mode Selection:

The RH850VC offers two operating modes, selected via the mode selector switch:

• Rotary Hammer Mode: For drilling in concrete, masonry, and stone with impact.
• Hammer-Only Mode: For chipping, chiseling, and demolition work.

Image 6.1: Visual representation of the Rotary Hammer and Hammer Only modes.

Using Rotary Hammer Mode:

1. Select the Rotary Hammer mode.
2. Insert the appropriate SDS-max drill bit.
3. Set the desired speed using the variable-speed dial.
4. Position the tool firmly against the workpiece.
5. Press the trigger switch to start drilling. Apply steady, even pressure.

Image 6.2: The RH850VC in use for drilling into a concrete slab.

Image 6.3: The RH850VC being used for coring a large diameter hole in a concrete wall.

Using Hammer-Only Mode:

1. Select the Hammer-Only mode.
2. Insert the appropriate SDS-max chisel or point.
3. Set the desired speed using the variable-speed dial.
4. Position the tool against the material to be chipped or chiseled.
5. Press the trigger switch. The Turbo Power feature can be engaged for a 20% power boost.

Image 6.4: The RH850VC in use for chipping away old floor tiles.

7. Maintenance

Regular maintenance ensures the longevity and optimal performance of your tool.

• Cleaning: Keep the ventilation openings clean and free from dust. Regularly wipe down the tool with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
• Lubrication: Periodically apply grease to the SDS-max bit shank before insertion to ensure smooth operation and reduce wear. Refer to the SDS-max bit system section for details.
• Inspection: Regularly inspect the power cord for damage. If damaged, have it replaced by a qualified service technician. Check for any loose screws or worn parts.
• Storage: Store the tool in a dry, secure location, out of reach of children.

8. Troubleshooting

This section addresses common issues you might encounter with your BOSCH RH850VC.

9. Technical Specifications

10. Warranty and Support

BOSCH offers a limited warranty for this tool. For detailed warranty terms and conditions, please refer to the official BOSCH warranty documentation or contact customer support.

Image 10.1: BOSCH Limited Warranty details, effective 6/1/23, covering 18V products. For updated terms, visit rb-pt.io/PowerToolWarranty or call 1-877-BOSCH99.

Customer Support:

For technical assistance, parts, or service, please contact BOSCH customer support. Refer to the contact information provided with your product packaging or visit the official BOSCH website.