Hitachi DH 50MRY, DH 50MR User Manual

Rotary Hammer Model DH 50MRY • DH 50MR

Handling instructions

Note: Before using this Electric Power Tool, carefully read through these HANDLING INSTRUCTIONS to ensure efficient, safe operation. It is recommended that these INSTRUCTIONS be kept readily available as an important reference when using this power tool.

GENERAL SAFETY RULES

WARNING! Read all instructions

Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury. The term “power tool” in all of the warnings listed below refers to your mains operated (corded) power tool or battery operated (cordless) power tool.

SAVE THESE INSTRUCTIONS

1) Work area a) Keep work area clean and well lit.

Cluttered and dark areas invite accidents.

b) 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 of fumes.

c) Keep children and bystanders away while operating

a power tool.

Distractions can cause you to lose control.

2) Electrical safety a) 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.

b) 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.

c) Do not expose power tools to rain or wet

conditions.

Water entering a power tool will increase the risk of electric shock.

d) Do not abuse the cord. Never use the cord for

carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts.

Damaged or entangled cords increase the risk of electric shock.

e) When operating a power tool outdoors, use an

extension cord suitable for outdoor use.

Use of a cord suitable for outdoor use reduces the risk of electric shock

3) Personal safety a) Stay alert, watch what you are doing and use

common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication.

A moment of inattention while operating power tools may result in serious personal injury.

b) Use safety equipment. Always wear eye protection.

Safety equipment such as dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries.

c) Avoid accidental starting. Ensure the switch is in

the off position before plugging in.

Carrying power tools with your finger on the switch or plugging in power tools that have the switch on invites accidents.

d) Remove any adjusting key or wrench before

turning the power tool on.

A wrench or a key left attached to a rotating part of the power tool may result in personal injury.

e) Do not overreach. Keep proper footing and balance

at all times.

This enables better control of the power tool in unexpected situations.

f) Dress properly. Do not wear loose clothing or

jewellery. Keep your hair, clothing and gloves away from moving parts.

Loose clothes, jewellery or long hair can be caught in moving parts.

g) If devices are provided for the connection of dust

extraction and collection facilities, ensure these are connected and properly used.

Use of these devices can reduce dust related hazards.

4) Power tool use and care a) Do not force the power tool. Use the correct

power tool for your application.

The correct power tool will do the job better and safer at the rate for which it was designed.

b) Do not use the power tool if the switch does not

turn it on and off.

Any power tool that cannot be controlled with the switch is dangerous and must be repaired.

c) Disconnect the plug from the power source before

making any adjustments, changing accessories, or storing power tools.

Such preventive safety measures reduce the risk of starting the power tool accidentally.

d) Store idle power tools out of the reach of children

and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool.

Power tools are dangerous in the hands of untrained users.

e) Maintain power tools. Check for misalignment or

binding of moving parts, breakage of parts and any other condition that may affect the power tools operation. If damaged, have the power tool repaired before use.

Many accidents are caused by poorly maintained power tools.

f) Keep cutting tools sharp and clean.

Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.

g) Use the power tool, accessories and tool bits etc.,

in accordance with these instructions and in the manner intended for the particular type of power tool, taking into account the working conditions and the work to be performed.

Use of the power tool for operations different from intended could result in a hazardous situation.

5) Service a) Have your power tool serviced by a qualified repair

person using only identical replacement parts.

This will ensure that the safety of the power tool is maintained.

PRECAUTION Keep children and infirm persons away. When not in use, tools should be stored out of reach of children and infirm persons.

PRECAUTIONS ON USING ROTARY HAMMER

1. Wear ear protectors Exposure to noise can cause hearing loss.

2. Do not touch the bit during or immediately after operation. The bit becomes very hot during operation and could cause serious burns.

3. 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.

4. Use auxiliary handles supplied with the tool. Loss of control can cause personal injury.

5. 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.

6. Wear a dust mask Do not inhale the harmful dusts generated in drilling or chiseling operation. The dust can endanger the health of yourself and bystanders.

SPECIFICATIONS

Model DH50MRY DH50MR

Voltage (by areas)* (110V, 115V, 120V, 127V, 220V, 230V, 240V)

Power input 1400 W*

Capacity Drill bit: 50 mm

No load speed 110 – 230 min

Full-load impact rate 1050 – 2150 min

Weight (without cord, side handle) 10.5 kg 10.0 kg

*Be sure to check the nameplate on product as it is subject to change by areas.

Core bit: 160 mm

-1

STANDARD ACCESSORIES

(1) Case ............................................................................. 1

(2) Side Handle ................................................................ 1

(3) Stopper ........................................................................ 1

(4) 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)

340, 540

320, 520

370, 570

2. Anchor hole drilling (Rotation + Hammering)

Drill bit (Taper shank)

(3) Cotter

(1) Drill bit (taper shank)

External dia.: 11, 12.3, 12.7,

14.3, 14.5,

(2) Taper shank

adapter (SDS max shank)

17.5 mm

Taper shank adapter

Morse taper Drill bit (taper shank) (No. 1) 11, 12.3, 12.7, 14.3, 14.5, 17.5 mm

Application drill bit

Adapter for SDS-plus shank bit

(1) Drill bit

(SDS-plus shank)

(2) Adapter for SDS-plus

shank bit (SDS max shank)

3. Large dia. hole boring (Rotation + Striking)

(Guide plate)

(1) Center

(2) Core

bit

(3) Core bit

shank

(1) Center pin

䢇 Applied to core bits from 38 mm to 150 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, 120, 150 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

materials

10. Surface Roughing (Hammering)

(1) Bushing Tool

11. Tamping (Hammering)

(1) Rammer

150 × 150 mm

12. Syringe (for chip removal)

(2) Shank

13 mm drill chuck (13VLA)

Chuck wrench

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

Overall length: 280, 400 mm

8. Asphalt cutting (Hammering)

9. Scooping Work (Hammering)

Chuck adapter (SDS max shank)

(SDS max shank)

12.7 mm Chemical Anchor Adaptor

19 mm Chemical

Anchor Adaptor

(1) Cutter

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.

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).

(1) Scoop

Grease

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.

Tool shank

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.

Front cap

Tool

Part of SDS max shank

(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 110 rotations per minute and 1050 times of blow per minute. The scale ‘6’ is designed for a maximum speed with the number of 230 rotations per minute and 2150 times of blow per minute.

Grip

Fig. 2

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.

(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.

Fig. 4

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 demolish (Fig. 5)

By applying the drill bit tip to the chiseling or demolishing position, operate the rotary hammer by utilizing its empty weight. Forcible pressing or thrusting is unnecessary.

Fig. 3

Dial

Fig. 5

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.

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