Hitachi DH 50MR Manual

PRODUCT NAME

Hitachi Rotary Hammer

Model DH 50MRY, DH 50MR

The new Model DH 50MRY is capable of drilling maximum 50-mm diameter holes into concrete and compatible

with SDS max shank tools. Equipped with the low vibration mechanism, the performance, durability and operabilit

are greatly improved. The Model DH 50MRY is released with the low-vibration hammer drill Model

DH 40MRY as our low-vibration series.

The new Model DH 50MR is an upgraded version of the current Model DH 50MB. The performance, durability and

operability are also improved greatly even though it is not equipped with the low vibration mechanism.

LIST Nos.

DH 50MRY: E499

DH 50MR: E498

Sep. 2007

Drilling holes in concrete and drilling anchor holes.

Demolishing and chiseling of concrete. Edging, gravel road digging, compacting and tamping, grooving,

cutting, stripping and roughing, etc.

MARKETING OBJECTIVE

APPLICATIONS

SELLING POINTS

International Sales Division

Equipped with a pendulum dynamic absorber as

the low vibration mechanism (Model DH 50MRY

only)

Fastest drilling speed and greatest chiseling

performance in the class

Vibration-absorbing handle

Constant speed with variable speed control

Easy-to-operate and double-molded switch handle

and side handle

Variable lock mechanism for easy working-angle

adjustment of chisels etc.

Needle-pin type slip clutch

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

REMARK:

For more information about HANDLING INSTRUCTIONS, visit our website at:

http://www.hitachi-koki.com/manual_view_export/

Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(are) used in the place of

company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here is(are) as follows:

Competitors

Symbols utilized Company name Model name

B BOSCH GBH-11DE

C MAKITA HR5211C

CONTENTS

Page

SELLING POINT DESCRIPTIONS ---------------------------------------------------------------------------------------- 1

SPECIFICATIONS ------------------------------------------------------------------------------------------------------------- 4

1. Specifications----------------------------------------------------------------------------------------------------- 4

2. Optional accessories ------------------------------------------------------------------------------------------- 5

COMPARISONS WITH SIMILAR PRODUCTS------------------------------------------------------------------------- 9

1. Specifications comparisons---------------------------------------------------------------------------------------------------------- 9

PRECAUTIONS IN SALES PROMOTION------------------------------------------------------------------------------10

1. Safety instructions ---------------------------------------------------------------------------------------------10

REFERENCE MATERIALS-------------------------------------------------------------------------------------------------11

REPAIR GUIDE----------------------------------------------------------------------------------------------------------------12

1. Precautions in disassembly and reassembly------------------------------------------------------------12

STANDARD REPAIR TIME (UNIT) SCHEDULES--------------------------------------------------------------------19

Assembly diagram for DH 50MRY

Assembly diagram for DH 50MR

-1-

Equipped with a pendulum dynamic absorber as the low vibration

mechanism (Model DH 50MRY only)

The Model DH 50MRY is equipped with the Hitachi's original pendulum dynamic absorber that absorbs

vibration from the main body by means of resonance of a leaf spring and a weight. As a result, the vibration

level of the Model DH 50MRY is remarkably lower than the current Model DH 50MB.

Fastest drilling speed and greatest chiseling performance in the class*

We conducted digital engineering to determine the optimal impact specifications. As a result, the Models

DH 50MRY and DH 50MR offer the fastest drilling speed and greatest chiseling performance in the class.

*Based on our own research

Direction : Downward drilling

Pushing force : 98 N (10 kgf)

Test material : Concrete panel with a compression strength of 2,352 N/cm2(240 kgf/cm2)

SELLING POINT DESCRIPTIONS

Weight

Leaf spring

100

200

300

400

22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54

Drill bit dia. (mm)

Drilling speed (mm/min)

DH50MB

DH 50MRY

DH 50MR

DH 50MB

Drilling speed comparison

-2-

Chiseling performance varies considerably depending on the work conditions. Use the factory

test results for comparison purposes only.

Refer to the Technical Data and Service Manual of the current Model DH 50MB for the following.

Vibration-absorbing handle

The two vibration-isolating rubbers provided between the

handle and the crank case, and also between the handle and

the housing efficiently absorb the vibration transmitted from the

tool main body to minimize transmission of vibration to the

operator’s arms.

Dial type, constant speed with variable speed control

The Model DH 50MRY/DH 50MR is equipped with a built-in

electronic control circuit that can adjust the number of hammering

steplessly between 1,050 and 2,150 min-1 with the dial. Even though

the load varies, the Model DH 50MRY/DH 50MR provides better

operability and stable and efficient drilling performance because the

constant speed control minimizes changes in number of rotation and

hammering.

130

160

115

160

0 50 100 150 200

Chiseling amount (kg/30 min)

DH 50MRY

DH 50MR

DH 50MB

Vibration-isolating rubber

Handle side

Dial

Chiseling performance comparison

DH 50MB / List No. E455

-3-

Easy-to-operate and double-molded switch handle and side handle

The base material of the switch handle and the side handle is plastic resin. The plastic resin base is

integrally molded with soft resin to realize a double layer structure. Thus the grip of the switch handle and

the side handle is soft for easier operation.

Change lever for switching between “Rotation + Hammering,”

“Neutral” and “Hammering only”

The Models DH 50MRY/DH 50MR provides three

functions, “rotation + hammering” function (for drilling),

“neutral” function (for positioning the tool tip) and

“hammering only” function (for chiseling and chipping).

These function modes can be easily switched by using the

change lever. The tool angle can be easily changed in 12

steps by turning the grip with the change lever positioned

at “Neutral.”

Needle-pin type slip clutch

The Model DH 50MRY/DH 50MR is equipped with a needle-pin type slip clutch for higher slip torque

accuracy and enhanced safety (same as the Model DH 50MB).

-4-

1. Specifications

Model

DH 50MRY DH 50MR

Drill bit (Max. dia.): 50 (2”)

Capacity mm Core bit (Max. dia.): 160 (6-1/4”)

Voltage V 110 120 220 230 240

Current A 14.0 12.8 7.0 6.7 6.4

Power input W 1,400

Enclosure

Materials : Aluminum alloy die casting (Cylinder case)

Nylon resin (Handle (A). (B), tail cover, hood,

crankcover,backcover)

Polycarbonate resin (Housing)

Paint : Green, black, gun metallic silver, silver

Switch

Trigger switch

Type of handles

D-shaped handle and side handle

Full load rotation rate min-1 110 - 230

Full load impact rate min-1 1,050 - 2,150

Packaging

Corrugated cardboard box with plastic tool case

Product*10.5 (23.1) 10.0 (22.0)

Weight Packed kg (lbs.) 16.0 (35.2) 15.5 (34.1)

Standard accessories

Plastic case----------------------------------------------------- 1

Side handle----------------------------------------------------- 1

Stopper --------------------------------------------------------- 1

Grease (A) ----------------------------------------------------- 1

*: Excluding cord and side handle

SPECIFICATIONS

-5-

2. Optional accessories

(1) Drilling work for through-hole drilling (Rotation + Impact)

D mm L mm Code No. D mm L mm Code No.

16 (5/8”) 340 (13-3/8”) 313448 16 (5/8”) 540 (21-1/4”) 313456

19 (3/4”) 340 (13-3/8”) 313449 19 (3/4”) 540 (21-1/4”) 313457

22 (7/8”) 320 (12-5/8”) 313450 22 (7/8”) 520 (20-15/32”) 313458

25 (1”) 320 (12-5/8”) 313451 25 (1”) 520 (20-15/32”) 313459

28 (1-1/8”) 370 (14-9/16”) 313452 28 (1-1/8”) 570 (22-7/16”) 313460

32 (1-1/4”) 370 (14-9/16”) 313453 32 (1-1/4”) 570 (22-7/16”) 313461

38 (1-1/2”) 370 (14-9/16”) 313454 38 (1-1/2”) 570 (22-7/16”) 313462

40 (1-9/16") 370 (14-9/16”) 313455 40 (1-9/16") 570 (22-7/16”) 313463

(2) Drilling work for anchor holes (Rotation + Hammering)

Drill bit (Taper shank)

(1) Drill bit (Taper shank) (2) Taper shank adapter (3) Cotter

D mm L mm Code No. Taper dimension Code No. Code No.

11.0 (7/16”) 100 (4”) 944460

12.3 (15/32”) 110 (4-5/16”) 944461

14.3 (9/16”) 110 (4-5/16”) 944462 Morse taper No.1 313464 944477

14.5 (9/16”) 110 (4-5/16”) 944500

17.5 (11/16”) 120 (4-3/4”) 944463

SDS-plus shank bit adapter

Code No.

313465

Drill bit (SDS max shank)

(1) Drill bit (Taper shank)

(2) Taper shank adapter

(SDSmaxshank)

(3) Cotter

Drill bit (SDS-plus shank) SDS-plus shank

bit adapter

(SDS max shank)

-6-

(3) Boring work for large-diameter holes (Rotation + Hammering)

(2) Core bit (1) Center pin (3) Core bit shank (SDS max)

D mm Guide plate l mm Code No. L mm Code No.

25 (1”)

29 (1-1/8”)

---

32 (1-1/4”)

35 (1-3/8”)

300 (11-13/16”) 313466

38 (1-1/2”)

147 (5-25/32”) 956009

45 (1-3/4”)

50 (2”)

54 (2-1/8”)

64 (2-1/2”)

65 (2-9/16”)

79 (3-1/8”)

80 (3-5/32”)

90 (3-17/32”)

94 (3-11/16”)

100 (3-15/16”)

105 (4-1/8”)

120 (4-3/4”)

125 (4-29/32”)

133 (5-1/4”) 955165 300 (11-13/16”) 313467

(4) Hole drilling

13 mm drill chuck (13VLD-D) with chuck wrench Chuck adapter

Code No. Code No.

321813 313468

(5) Chemical anchor holes drilling work (Rotation + Hammering)

Socket square size mm Code No.

12.7 (1/2”) 313469

19.0 (3/4”) 313470

Chuck adapter

(SDS max shank)

Chuck wrench

13 mm drill chuck

(13VLD-D)

Chemical anchor adapter

(SDSmaxshank)

(Socket)

(1) Center pin (Guide plate) (2) Core bit (3) Core bit shank

(SDSmaxshank)

-7-

(6) Crushing work (Hammering mode)

Bull point (SDS max shank)

L mm Code No.

280 (11”) 313471

400 (15-3/4”) 313472

(7) Groove digging and edging (Hammering mode)

Cold chisel (SDS max shank)

L mm Code No.

280 (11”) 313473

400 (15-3/4”) 313474

(8) Cutting and stripping (Asphalt cutting etc.) (Hammering mode)

Cutter (SDS max shank)

L mm Width mm Code No.

400 (15-3/4”) 50 (2”) 313475

(9) Scooping work (Hammering mode)

Scoop (SDS max shank)

L mm Code No.

400 (15-3/4”) 313476

(10) Surface roughing work (Hammering)

Bushing tool Shank (SDS max shank)

Code No. L mm Code No.

313477 220 (8-21/32”) 313479

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