Hitachi DH 40MR User Manual
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GENERAL OPERATIONAL PRECAUTIONS
WARNING! When using electric tools, basic safety
precautions should always be followed to reduce the risk
of fire, electric shock and personal injury, including the
following.
Read all these instructions before operating this product
and save these instructions.
For safe operations:
1. Keep work area clean. Cluttered areas and benches
invite injuries.
2. Consider work area environment. Do not expose
power tools to rain. Do not use power tools in damp
or wet locations. Keep work area well lit.
Do not use power tools where there is risk to cause
fire or explosion.
3. Guard against electric shock. Avoid body contact
with earthed or grounded surfaces. (e.g. pipes,
radiators, ranges, refrigerators).
4. Keep children away. Do not let visitors touch the
tool or extension cord. All visitors should be kept
away from work area.
5. Store idle tools. When not in use, tools should be
stored in a dry, high or locked up place, out of reach
of children.
6. Do not force the tool. It will do the job better and
safer at the rate for which it was intended.
7. Use the right tool. Do not force small tools or
attachments to do the job of a heavy duty tool. Do
not use tools for purposes not intended; for example,
do not use circular saw to cut tree limbs or logs.
8. Dress properly. Do not wear loose clothing or
jewelry, they can be caught in moving parts. Rubber
gloves and non-skid footwear are recommended
when working outdoors. Wear protecting hair
covering to contain long hair.
9. Use eye protection. Also use face or dust mask if
the cutting operation is dusty.
10. Connect dust extraction equipment.
If devices are provided for the connection of dust
extraction and collection facilities ensure these are
connected and properly used.
11. Do not abuse the cord. Never carry the tool by the
cord or yank it to disconnect it from the receptacle.
Keep the cord away from heat, oil and sharp edges.
12. Secure work. Use clamps or a vise to hold the work.
It is safer than using your hand and it frees both
hands to operate tool.
13. Do not overreach. Keep proper footing and balance
at all times.
14. Maintain tools with care. Keep cutting tools sharp
and clean for better and safer performance. Follow
instructions for lubrication and changing
accessories. Inspect tool cords periodically and if
damaged, have it repaired by authorized service
center. Inspect extension cords periodically and
replace, if damaged. Keep handles dry, clean, and
free from oil and grease.
15. Disconnect tools. When not in use, before servicing,
and when changing accessories such as blades, bits
and cutters.
16. Remove adjusting keys and wrenches. Form the
habit of checking to see that keys and adjusting
wrenches are removed from the tool before turning
it on.
17. Avoid unintentional starting. Do not carry a pluggedin tool with a finger on the switch. Ensure switch is
off when plugging in.
18. Use outdoor extension leads. When tool is used
outdoors, use only extension cords intended for
outdoor use.
19. Stay alert. Watch what you are doing. Use common
sense. Do not operate tool when you are tired.
20. Check damaged parts. Before further use of the tool,
a guard or other part that is damaged should be
carefully checked to determine that it will operate
properly and perform its intended function. Check
for alignment of moving parts, free running of
moving parts, breakage of parts, mounting and any
other conditions that may affect its operation. A
guard or other part that is damaged should be
properly repaired or replaced by an authorized
service center unless otherwise indicated in this
handling instructions. Have defective switches
replaced by an authorized service center. Do not use
the tool if the switch does not turn it on and off.
21. Warning
The use of any accessory or attachment, other than
those recommended in this handling instructions,
may present a risk of personal injury.
22. Have your tool repaired by a qualified person.
This electric tool is in accordance with the relevant
safety requirements. Repairs should only be carried
out by qualified persons using original spare parts.
Otherwise this may result in considerable danger
to the user.
PRECAUTIONS ON USING ROTARY HAMMER
䡬 Wear earplugs to protect your ears during operation.
䡬 Do not touch the bit during or immediately after
operation. The bit becomes very hot during operation
and could cause serious burns.
䡬 Before starting to break, chip or drill into a wall, floor
or ceiling, thoroughly confirm that such items as
electric cables or conduits are not buried inside.
䡬 Always hold the body handle and side handle of the
power tool firmly. Otherwise the counterforce
produced may result in inaccurate and even
dangerous operation.
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SPECIFICATIONS
Voltage (by areas)* (110V, 115V, 120V, 127V, 220V, 230V, 240V)
Power input 950 W*
Capacity Drill bit: 40 mm
No load speed 240 – 480/min
Full-load impact rate 1320 – 2650/min
Weight (without cord, side handle) 6.5 kg
* Be sure to check the nameplate on product as it is subject to change by areas.
Core bit: 105 mm
STANDARD ACCESSORIES
(1) Case (Molded plastic) ................................................. 1
(2) Side Handle ................................................................. 1
(3) Stopper ........................................................................ 1
(4) Hexagon Bar Wrench (for 6 mm screw) ................... 1
(5) Hexagon Bar Wrench (for 5 mm screw) ................... 1
(6) Hexagon Bar Wrench (for 4 mm screw) ................... 1
(7) Hammer Grease A ......................................................1
Standard accessories are subject to change without
notice.
OPTIONAL ACCESSORIES (sold separately)
1. Through-hole drilling (Rotation + Hammering)
(1) Drill bit (SDS max shank)
Outer diameter (mm) Overall length (mm)
16
19
22
25
28
32
38
40
2. Anchor hole drilling (Rotation + Hammering)
Drill bit (Taper shank)
340, 540
320, 520
370, 570
Taper shank
adapter
Morse taper Drill bit (taper shank)
(No. 1) 11, 12.3, 12.7, 14.3, 14.5, 17.5 mm
Adapter for SDS-plus shank bit
(1) Drill bit
(SDS-plus shank)
3. Large dia. hole boring (Rotation + Striking)
(Guide
plate)
(1) Center pin
䢇 Applied to core bits from 38 mm to 105 mm
䢇 Applied to core bits 32 mm and 35 mm
NOTE
Do not use core bits 25 mm or 29 mm.
(2) Core bit
䢇 External dia. 25, 29, 32, 35, 38, 45, 54, 64, 79, 94, 105
mm (with guide plate, not applicable to cores 25 mm
or 29 mm)
(3) Core bit shank
䢇 Applied to core bits above 38 mm
䢇 Applied to core bits below 35 mm
4. Drilling holes ...... For drilling metal and wooden
Application drill bit
(1) Center
pin
materials
(2) Adapter for SDS-plus
shank bit
(SDS max shank)
(2) Core
bit
(3) Core bit
shank
(3) Cotter
(1) Drill bit (taper shank)
External dia.: 11, 12.3, 12.7,
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14.3, 14.5,
17.5 mm
(2) Taper shank
adapter
(SDS max shank)
13 mm drill chuck
(13VLA)
Chuck wrench
Chuck adapter
(SDS max shank)
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5. Bolt placing operation with Chemical Anchor.
(Rotation + Hammering)
(Standard socket
on the market)
6. Crushing (Hammering)
(1) Bull point
Overall length: 280, 400 mm
7. Groove digging and edging (Hammering)
(1) Cold chisel
8. Asphalt cutting (Hammering)
9. Scooping Work (Hammering)
10. Surface Roughing (Hammering)
(1) Bushing Tool
11. Tamping (Hammering)
(1) Rammer
150 × 150 mm
12. Syringe (for chip removal)
䡬 Hammer grease A
500 g (in a can)
70 g (in a green tube)
30 g (in a green tube)
Optional accessories are subject to change without
notice.
(SDS max shank)
12.7 mm Chemical
Anchor Adaptor
19 mm Chemical
Anchor Adaptor
Overall length: 280, 400 mm
(1) Cutter
(1) Scoop
(2) Shank
(2) Shank
APPLICATIONS
䡬 Drilling holes in concrete
䡬 Drilling anchor holes
䡬 Crushing concrete, chipping, digging, and squaring
(by applying optional accessories)
PRIOR TO OPERATION
1. Power source
Ensure that the power source to be utilized conforms
to the power requirements specified on the product
nameplate.
2. Power switch
Ensure that the power switch is in the OFF position.
If the plug is connected to a power receptacle while
the power switch is in the ON position, the power
tool will start operating immediately, which could
cause a serious accident.
3. Extension cord
When the work area is removed from the power
source, use an extension cord of sufficient thickness
and rated capacity. The extension cord should be kept
as short as practicable.
4. How to install tool
NOTE
For tools such as a bull point and a cold chisel, use
only Hitachi genuine parts.
(1) Clean, then smear the tool shank with the grease
provided in the green tube (Fig. 1).
(2) To attach the tool (SDS max shank), insert it into the
hole until it contacts the innermost end of the hole as
illustrated in Fig. 2.
If you continue to turn the tool with slight pressure,
you can feel a spot where there is a hitch. At that
spot, pull the grip to the direction of an arrow mark
and insert the tool all the way until it hits the innermost
end.
Releasing the grip reverts the grip and secures the
tool in place.
(3) Pull the tool to make sure it is locked completely.
(4) To remove the tool, fully pull the grip in the direction
of the arrow and pull out the tool.
5. Regulating the number of rotations and hammering
(Fig. 3)
This Rotary Hammer is equipped with a built-in
electronic control circuit that can adjust and regulate
the number of rotations and times of hammering. This
Rotary Hammer can be used by adjusting the dial,
depending upon the contents of operation, such as
boring holes into fragile materials, chipping,
centering, etc.
The scale ‘1’ of the dial is designed for a minimum
speed with the number of 240 rotations per minute
and 1320 times of blow per minute. The scale ‘6’ is
designed for a maximum speed with the number of
480 rotations per minute and 2650 times of blow per
minute.
CAUTION:
Do not adjust the dial during operation. Doing so can
result in injury because the Rotary Hammer must be
held by only one hand, disabling the steady control
of the Rotary Hammer.
HOW TO USE THE ROTARY HAMMER
1. How to drill holes (Fig. 4)
(1) Pull the switch trigger after applying the drill bit tip to
the drilling position.
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(2) It is unnecessary to forcibly press the rotary hammer
main body. It is sufficient to slightly press the rotary
hammer to an extent that shavings are freely
discharged.
CAUTION
Although this machine is equipped with a safety
clutch, if the drill bit becomes bound in concrete or
other material, the resultant stoppage of the drill bit
could cause the machine body to turn in reaction.
Ensure that the main handle and side handle are
gripped firmly during operation.
2. How to chisel or crush (Fig. 5)
By applying the drill bit tip to the chiseling or crushing
position, operate the rotary hammer by utilizing its
empty weight.
Forcible pressing or thrusting is unnecessary.
3. When drilling at “rotation + hammering”:
CAUTION:
If you switch the selector lever during motor rotation,
the tool can start to rotate abruptly, resulting in
unexpected accidents. Be sure to switch the selector
lever when the motor is at a complete stop.
(1) Switching to “rotation + hammering”
(a) Push the button, release lock and turn the selector
lever clockwise.
(b) Align ▲ of the selector lever and
holder as illustrated in Fig. 6.
(c) Release the button to lock the selector lever.
NOTE:
Turn the selector lever (do not push the button) to
check if it is completely locked and make sure that it
does not turn.
4. When chipping and chiseling at “hammering”:
CAUTION:
䡬 If the selector lever is switched during motor rotation,
the tool can start to rotate abruptly, resulting in
unexpected accidents. Make sure to switch the
selector lever when the motor is at a complete stop.
䡬 If the bull point or cold chisel is used at the position
of ”rotation + hammering”, the tool can start to rotate,
resulting in unexpected accidents. Make sure that they
are used at the position of ”hammering”.
(1) Switching to ”hammering”
(a) Push the button, release lock and turn the selector
lever counterclockwise.
(b) Align ▲ of the selector lever and
holder as illustrated in Fig. 7.
(c) Release the button to lock the selector lever.
NOTE:
Turn the selector lever (do not push the button) to
check if it is completely locked and make sure that
it does not turn.
(2) When fixing working positions of tools such as cold
chisel, etc.,
(a) Push the button, release lock and turn the selector
lever.
Align ▲ of the selector lever and
holder as illustrated in Fig. 8.
(b) Release the button to lock the selector lever.
(c) Turn the grip as illustrated in Fig. 9 and fix the
tool to the desired working direction.
(d) Switch the selector lever to “hammering”
according to the procedures mentioned in the
above item (1) and secure the position of the tool.
of the lever
of the lever
of the lever
5. Install the stopper (Fig. 10)
(1) Loosen the side handle and insert the straight portion
of the stopper into the handle bolt hole.
(2) Move the stopper to the specified position and rotate
the grip of the side handle clockwise to fix the stopper.
6. Warming up (Fig. 11)
The grease lubrication system in this unit may require
warming up in cold regions.
Position the end of the bit so makes contact with the
concrete, turn on the switch and perform the warming
up operation. Make sure that a hitting sound is
produced and then use the unit.
CAUTION
When the warming up operation is performed, hold
the side handle and the main body securely with both
hands to maintain a secure grip and be careful not to
twist your body by the jammed drill bit.
DRILLING AND DRIVING-IN OPERATIONS FOR
ANCHORS
1. When a taper shank adapter is used. (Fig. 12)
(1) Install drill bit with taper shank in the taper shank
adapter.
(2) Turn the power on and drill a base hole to the depth
sounded by indicating groove on the drill bit.
(3) After cleaning out dust with a syringe, attach the plug
to the anchor tip and drive in the anchor with a manual
hammer.
(4) To remove the drill bit (taper shank), insert the cotter
into the slot of the taper shank adapter and strike the
head of the cotter with a manual hammer supporting
on a rest. (Fig. 13)
USING DRILL CHUCK, CHUCK ADAPTER
Note that this machine can be used at “rotation only” if
separately sold parts such as drill chuck and chuck adapter
are attached. Use it with the selector lever positioned at
“rotation + hammering”.
CAUTION:
During operation, be sure to grip the handle and the
side handle firmly to prevent your body from swaying.
(1) Switching to “rotation + hammering”
For switching to “rotation + hammering”, follow the
same procedures mentioned in [3. When drilling at
“rotation + hammering”].
(2) Attaching chuck adapter to drill chuck (Fig. 14)
(a) Attach the chuck adapter to the drill chuck.
(b) The SDS max shank of the chuck adapter is
equivalent to the drill bit. Therefore, follow the
same procedure as [How to install tool] for
attaching and detaching.
(3) Drilling
(a) Even if you apply more-than-required pressure to
the machine body, drilling can never be performed
as quickly as you expect. Applying more force or
pressure to the machine body than what is needed,
on the contrary, damages the drill tip, resulting in
the declined working efficiency and shortened life
of this machine.
(b) A drill can snap sometimes when drilling is almost
finished. It is important to relax your thrusting
pressure when drilling is nearing the end.
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