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ENGLISH (Original instructions) 

SPECIFICATIONS 

Model 8420V 

Concrete 20 

mm 

Metal 13 

mm 

Capacities 

Wood 30 

mm 

No load speed (min

-1

0 - 1,400 

Blows per minute 

0 - 21,000 

Overall length 

368 mm 

Net weight 

2.9 kg 

Safety class 

Class I 

• Due to our continuing program of research and development, the specifications herein are subject to change without notice. 
• Specifications may differ from country to country. 
• Weight according to EPTA-Procedure 01/2003 

 

END224-1 

Symbols 

The following show the symbols used for the equipment. 
Be sure that you understand their meaning before use. 

  Read instruction manual. 

 

  Only for EU countries 

Do not dispose of electric equipment 
together with household waste material! 
In observance of European Directive 
2002/96/EC on waste electric and 
electronic equipment and its 
implementation in accordance with 
national law, electric equipment that 
have reached the end of their life must 
be collected separately and returned to 
an environmentally compatible recycling 
facility. 

ENE039-1 

Intended use

 

The tool is intended for impact drilling in brick, concrete 
and stone as well as for drilling without impact in wood, 
metal, ceramic and plastic. 

ENF001-1 

Power supply

 

The tool should be connected only to a power supply of 
the same voltage as indicated on the nameplate, and can 
only be operated on single-phase AC supply. This tool 
should be grounded while in use to protect the operator 
from electric shock. Use only three-wire extension cords 
which have three-prong grounding-type plugs and 
three-pole receptacles which accept the tool's plug. 

 
 
 
 
 
 
 
 
 

GEA005-3 

General Power Tool Safety 
Warnings 

 

WARNING Read all safety warnings and all 

instructions.

 Failure to follow the warnings and 

instructions may result in electric shock, fire and/or 
serious injury. 

Save all warnings and 
instructions for future reference. 

The term "power tool" in the warnings refers to your 
mains-operated (corded) power tool or battery-operated 
(cordless) power tool. 

Work area safety 

1. 

Keep work area clean and well lit.

 Cluttered or 

dark areas invite accidents. 

2. 

Do not operate power tools in explosive 
atmospheres, such as in the presence of 
flammable liquids, gases or dust.

 Power tools 

create sparks which may ignite the dust or fumes. 

3. 

Keep children and bystanders away while 
operating a power tool.

 Distractions can cause 

you to lose control. 

Electrical safety 

4. 

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.

 Unmodified plugs and matching outlets will 

reduce risk of electric shock. 

5. 

Avoid body contact with earthed or grounded 
surfaces such as pipes, radiators, ranges and 
refrigerators.

 There is an increased risk of 

electric shock if your body is earthed or grounded. 

6. 

Do not expose power tools to rain or wet 
conditions.

 Water entering a power tool will 

increase the risk of electric shock. 

Summary of Contents for 8420V

Page 1: ...1 ENGLISH Original instructions INSTRUCTION MANUAL IMPORTANT Read Before Using Hammer Drill 8420V 012949 ...

Page 2: ...ly This tool should be grounded while in use to protect the operator from electric shock Use only three wire extension cords which have three prong grounding type plugs and three pole receptacles which accept the tool s plug GEA005 3 General Power Tool Safety Warnings WARNING Read all safety warnings and all instructions Failure to follow the warnings and instructions may result in electric shock ...

Page 3: ...se clothes jewellery or long hair can be caught in moving parts 17 If devices are provided for the connection of dust extraction and collection facilities ensure these are connected and properly used Use of dust collection can reduce dust related hazards Power tool use and care 18 Do not force the power tool Use the correct power tool for your application The correct power tool will do the job bet...

Page 4: ...PTION CAUTION Always be sure that the tool is switched off and unplugged before adjusting or checking function on the tool Switch action 1 2 3 012954 CAUTION Before plugging in the tool always check to see that the switch trigger actuates properly and returns to the OFF position when released Switch can be locked in ON position for ease of operator comfort during extended use Apply caution when lo...

Page 5: ... three chuck holes evenly To remove the bit turn the chuck key counterclockwise in just one hole then loosen the chuck by hand After using the chuck key be sure to return it to the original position Depth gauge 1 2 012952 Loosen the wing bolt and adjust the depth gauge to the desired depth After adjusting tighten the wing bolt OPERATION CAUTION Always use the side grip auxiliary handle and firmly ...

Page 6: ...of hole break through Hold the tool firmly and exert care when the bit begins to break through the workpiece A stuck bit can be removed simply by setting the reversing switch to reverse rotation in order to back out However the tool may back out abruptly if you do not hold it firmly Always secure small workpieces in a vise or similar hold down device MAINTENANCE CAUTION Always be sure that the too...

Page 7: ...7 ...

Page 8: ...8 Makita Corporation www makita com 883328D9 ...

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