Hitachi DH 50MR Technical Data And Service Manual

Brand: Hitachi

Model: DH 50MR

Category: Rotary hammers

Type: Technical Data And Service Manual

This manual is also suitable for

DH 50MRY

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/cm

(240 kgf/cm

)

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,

crank cover, back cover)

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

(SDS max shank)

(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

(SDS max shank)

(Socket)

(1) Center pin (Guide plate)

(2) Core bit

(3) Core bit shank

(SDS max shank)

-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

-8-

(11) Tamping work (Hammering)

Rammer Shank (SDS max shank)

L mm Code No. l mm Code No.

150 (5-29/32”) 313478 220 (8-21/32”) 313479

(12) Syringe (for chip removal)

Syringe Code No.

Bellows 318085

Blow-out bulb 320859

(13) Grease

Code No. Code No.

980927 981840

Note:

Code numbers listed above are subject to change without notice.

Please refer to periodic Technical News Bulletins.

500

(

1.1 lbs.

)

Can

30 g (1 oz) Tube

-9-

1. Specifications comparisons

(Superior specifications:

)

Maker HITACHI

Model name DH 50MRY DH 50MR DH 50MB

C B

Drill bit dia. mm

(2”)

(2-1/16”)

Capacity

Core bit dia. mm

160

(6-1/4”)

160

(6-1/4”)

160

(6-1/4”)

150

(5-29/32”)

Power input W 1,400 1,400 1,500 1,500

Impact energy J (ft-lb) 20 (14.7) 18.0 (13.3) 19.7 (14.5) 18.0 (13.3)

Vibration reduction

mechanism

Equipped

Not

indicated

Not

indicated

Equipped

Not

indicated

Full-load rotation rate min

-1

110 -

230 120 -

250 130 -

260 120 -

250

Full-load impact rate min

-1

1,050 - 2,150 1,200 -

2,150 1,075 -

2,150 1,100 -

2,250

Full-load vibration level

(Tri-axial, measured)

m/s

11.7 17.8 26.0 13.5 21.0

No-load noise level

(measured)

dB 81 81 83 81 82

Full-load noise level

(measured)

dB 98 98 98 98 97

Length

570

(22-7/16”)

495

(19-1/2”)

599

(23-5/8”)

595

(23-7/16”)

Height

285

(11-7/32”)

293

(11-9/16”)

287

(11-5/16”)

280

(11-1/32”)

Tool size

Width

120

(4-3/4”)

120

(4-3/4”)

149

(5-7/8”)

128

(5-15/32”)

Weight* kg (lbs.) 10.5 (23.1) 10.0 (22.0) 9.8 (21.6) 11.6 (25.6) 11.1 (24.5)

*: Weight does not include cord and side handle.

COMPARISONS WITH SIMILAR PRODUCTS

-10-

1. Safety instructions

In the interest of promoting the safest and most efficient use of the Models DH 50MRY/DH 50MR Rotary

Hammers by all of our customers, it is very important that at the time of sale, the salesperson carefully

ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions,

and fully understands the meaning of the precautions listed on the Caution Plate and Name Plate attached

to each tool.

A. Handling Instructions

Although every effort is made in each step of design, manufacture and inspection to provide protection

against safety hazards, the dangers inherent in the use of any electric tool cannot be completely eliminated.

Accordingly, general precautions and suggestions for the use of electric power tools, and specific

precautions and suggestions for the use of the Rotary Hammers are listed in the Handling Instructions to

enhance the safe, efficient use of the tool by the customer. Salespersons must be thoroughly familiar with

the contents of the Handling Instructions to be able to offer appropriate guidance to the customer during

sales promotion.

B. Caution Plate

The Model DH 50MRY/DH 50MR unit is provided with a Caution Plate (illustrated below) which lists basic

safety precautions in use. Carefully ensure that the customer fully understands and follows these

precautions before using the tool.

[ For Australia and New Zealand ]

[ For the U.S.A. and Canada ]

[ For China ]

PRECAUTIONS IN SALES PROMOTION

-11-

C. Grease replacement procedures

The hammering section and the gear change section use different types of grease respectively. It is not

necessary to replenish the grease unless the tool is disassembled for repair or there is a grease leakage

due to a damaged seal.

A special grease is used for the hammering section. After disassembly of the hammering section (inside the

cylinder case and the crank case), carefully wipe the old grease off the parts and fill the cylinder case and

the crank case (connecting rod side) with 70 g of grease. Take care not to overfill the grease as an

excessive amount of grease can cause hammering failure.

The gear change section (inside the gear cover) uses Hitachi Motor Grease No. 29. The proper amount of

grease is 30 g. Never use the special grease for the hammering section in the gear change section.

Otherwise, the special grease will leak into the motor section and cause subsequent troubles. Periodically

change the grease in the slip clutch. Fill the slip clutch with Hitachi Motor Grease No. 29 to the full.

Refer to the Technical Data and Service Manual for the following model.

REFERENCE MATERIALS

DH 50MB / List No. E455

-12-

Front Cap [1]

Grip [2]

Stopper Ring [3]

Needle Rollers D8 x 20 [18]

Needle Holder [4]

Retainer Spring [5]

Spring Holder [6]

Retainer Sleeve [19]

Be sure to disconnect the power cord plug from the wall outlet before repairing. Otherwise, the motor turns

abruptly and it is very dangerous.

1. Precautions in disassembly and reassembly

The [Bold] numbers in the description below correspond to the item numbers in the Parts List and the

exploded assembly diagram for the Models DH 50MRY/DH 50MR.

1. Disassembly of the tool retainer

Pull the Grip [2] in the arrow direction to full as shown in Fig. 1. Remove the Front Cap [1]. (Front Cap [1]

is fitted securely. Pull the Front Cap [1] forcefully to remove.) Thus the Grip [2] can be removed from the

Retainer Sleeve [19].

Remove the Stopper Ring [3] using a retaining ring puller. Then the Needle Holder [4], two Needle

Rollers D8 x 20 [18], Retainer Spring [5] and Spring Holder [6] can be removed from the Retainer Sleeve

[19]. (Fig. 2)

Fig. 1

Fig. 2

2. Disassembly of the hammering mechanism and the vibration reduction mechanism

(a) Second Hammer [21] and Striker [31]

Remove the Seal Lock Hex. Socket Hd. Bolt M8 x 25 [7]. Then the Retainer Sleeve [19], Second

Hammer [21], Cylinder [26], Striker [31], etc. can be pulled out of the Cylinder Case [37] in an assembly

state as shown in Fig. 3. Remove the Clutch Spring [30], Lock Spring [27] and Spring Holder (B) [29]

from this assembly. Turn the Retainer Sleeve [19] and remove the eight Needle Pins D8 x 6 [25] to

separate the Retainer Sleeve [19] from the Cylinder [26]. Remove the Second Hammer [21] from the

separated Retainer Sleeve [19] together with the Damper Holder [24], Damper [23] and Damper Washer

[22]. Remove the Striker [31] by tapping the end face of the separated Cylinder [26] with a plastic

hammer (Fig. 3).

(b) Piston [35]

Remove each bolt fixing the Lever Holder [45], Hood [59] and Crank Cover [86] to the Cylinder Case

[37] and the Crank Case [115]. Remove the Hex. Socket Hd. Bolt (W/Flange) M8 x 35 [38]. Then the

Cylinder Case [37] can be removed from the Crank Case [115]. To remove the Piston [35], remove the

Retaining Ring for D12 Shaft [78] using a retaining ring puller and remove the Connecting Rod [36] from

the Crank Shaft [79] (Fig. 3).

Remove the Seal Lock Hex. Socket Hd. Bolt M5 x 30 [90] from the Crank Case [115]. Then the vibration

reduction mechanism such as the Weight [88], Leaf Spring [93], etc. can be pulled out as the weight

ass'y (Fig. 3).

Disassembl

REPAIR GUIDE

-13-

Fig. 3

(d) First Gear [116] and Crank Shaft [79]

Remove the Seal Lock Hex. Socket Hd. Bolt M6 x 45 [114], Seal Lock Hex. Socket Hd. Bolt M6 x 22

[122], Seal Lock Hex. Socket Hd. Bolt M5 x 30 [90], Seal Lock Hex. Socket Hd. Bolt M5 x 16 [67], Hex.

Socket Hd. Bolt (W/Flange) M5 x 14 [54] and Tapping Screw (W/Flange) D5 x 30 (Black) [63] and

remove the Crank Case [115] from the Housing Ass'y [136], Back Cover [53] and Handle (A). (B) Set

[56]. (Note that the Gear Cover [113] and the Crank Case [115] cannot be removed without removing the

Seal Lock Hex. Socket Hd. Bolt M5 x 30 [90] and separating the weight ass'y from the Crank Case

[115].)

Remove grease from the Piston [35] side and the First Gear [116] side of the Crank Case [115].

Remove the Retaining Ring for D47 Hole [81] fixing the Ball Bearing 6204DDCMPS2L [82] with a

retaining ring puller. At this time, turn the Crank Shaft [79] so that the hole of the Retaining Ring for

D47 Hole [81] can be seen before removal (Fig. 4). Press the end face of the Crank Shaft [79] with

a hand press to remove the First Gear [116], Second Pinion [117] and Crank Shaft [79] from the

Crank Case [115] (Fig. 5).

Fig. 4 Fig. 5

(e) Slip Cluch

Refer to the Technical Data and Service Manual for the Model DH 50MB (List No. E455) because the slip

clutch mechanism is the same as that of the Model DH 50MB.

Retainer Sleeve [19]

Second Hammer [21]

Cylinder [26]

Lock Spring [27]

Clutch Spring [30]

Striker [31]

Cylinder Case [37]

Spring Holder (B) [29]

Needle Pin D8 x 6 [25]

Damper Holder [24]

Damper [23]

Piston [35]

Retaining Ring for D12 Shaft [78]

Connecting Rod [36]

Crank Shaft [79]

Damper Washer [22]

Weight ass’y

Weight [88]

Leaf Spring [93]

Crank Shaft [79]

Retaining Ring For D47 Hole [81]

Crank Case [115]

Crank Shaft [79]

First Gear [116]

Support

Second Pinion [117]

-14-

Reassembly can be accomplished by following the disassembly procedure in reverse. However, special

attention should be given to the following items.

1. Reassembly of the hammering mechanism and the vibration reduction mechanism

(a) First Gear [116] and Crank Shaft [79]

Press-fit the Oil Seal [84] into the Crank Case [115] and

mount O-ring (B) [83]. Press-fit the Ball Bearing

6204DDCMPS2L [82]. Mount the Retaining Ring for D47

Hole [81] using a retaining ring puller. Press-fit the

Crank Shaft [79] into the Ball Bearing 6204DDCMPS2L

[82]. Put the Feather Key 3 x 3 x 25 [80] in the groove of

the Crank Shaft [79] and press-fit the First Gear [116]

with a suitable jig while holding the flat portion of the

Crank Shaft [79] with a steel bar. Before press-fitting,

make sure that the Feather Key 3 x 3 x 25 [80] fits in the

key groove of the First Gear [116]. Press-fit the Second

Pinion [117] until it contacts the First Gear [116] (Fig. 6).

(b) Piston [35]

Insert the Connecting Rod [36] into the Piston [35] and insert the Piston Pin [34] into the 10-mm dia. hole

(marked side) of the Piston [35]. (Be careful not to protrude the Piston Pin [34] from the outside diameter

of the Piston [35].) Mount the O-ring [32] to the Piston [35] to make the piston ass'y. Move the crank pin

of the Crank Shaft [79] to the bottom dead center and mount the piston ass'y to the Crank Shaft [79] from

the Cylinder Case [37] side of the Crank Case [115]. Mount the Retaining Ring for D12 Shaft [78] using a

retaining ring puller (Fig. 7).

Mount the Retainer Damper [17], Thrust Washer (A) [16] and Sleeve [15] (with the Ball Bearing 6008CM

[14] press-fitted) to the Retainer Sleeve [19] in this order and fix it with the Retaining Ring D40 [13].

Mount the Second Hammer [21] (with the O-ring [20] mounted), Damper Washer [22], Damper [23] and

Damper Holder [24] to the Retainer Sleeve [19] in this order aligning the rounded portion of the Damper

Washer [22] with the rounded portion of the Second Hammer [21]. Insert the Striker [31] (with the O-ring

[32] mounted) into the Cylinder [26] then insert the Cylinder [26] into the Retainer Sleeve [19]. Secure

the Retainer Sleeve [19] and the Cylinder [26] by inserting the eight Needle Pins D8 x 6 [25] into the 8-

mm dia. holes and cover it with Spring Holder (B) [29].

First Gear [116]

BB.6204DDCMPS2L [82]

Support

Oil Seal [84]

Reassembl

Fig. 6

Piston Pin [34]

Connecting Rod [36]

Piston [35]

O-ring [32]

Piston ass’y

Crank Shaft [79]

Retaining Ring for D12 Shaft [78]

Crank Case [115]

Mark

Fig. 7

-15-

Mount the Clutch Spring [30], Lock Spring [27], Lock Sleeve [28] and Clutch [33] to the Cylinder [26].

Mesh the claw of the Lock Sleeve [28] with the claw of the Clutch [33] (thus the retainer sleeve ass'y is

made as shown in Fig. 8). Mount O-ring (D) [39], Thrust Washer (B) [40] and Bevel Gear [41] to the

Cylinder Case [37]. Then insert the retainer sleeve ass'y into the Cylinder Case [37] aligning the spline of

the Lock Sleeve [28] with the spline groove at the inner circumference of the Cylinder Case [37] (Fig. 8).

(d) Vibration reduction mechanism

Apply Hitachi Motor Grease No. 29 to the Washer [89] and adhere it to the end face of the hole portion of

the Weight [88]. Insert the Weight [88] into the Base [91] and insert the Weight Pin [92]. At this time,

apply Hitachi Motor Grease No. 29 to the Weight Pin [92]. Sandwich the Base [91] between the Leaf

Spring [93] and the Spring Holder [95] engaging the convex portion of the Base [91] with the concave

portion of the Spring Holder [95], then secure it with the Seal Lock Hex. Socket Hd. Bolt M5 x 16 [96]. At

this time, apply Hitachi Motor Grease No. 29 to the tip of the Leaf Spring [93] where the Weight [88]

contacts. Insert the two Weight Bumpers [94] into the back of the Base [91] so that the rounded portion

of the Weight Bumper [94] contacts the Weight [88]. Wind two Cylinder O-rings (B) [87] around the

Weight [88] without twisting (Fig. 9).

Washer [89]

Weight [88]

Base [91]

Weight Bumper [94]

Cylinder O-ring (B) [87]

Weight Pin [92]

Leaf Spring [93]

Spring Holder [95]

Seal Lock Hex. Socket Hd. Bolt M5 x 16 [96]

Tip of the Leaf Spring [93]

!!"# $

Retainer Sleeve [19]

Thrust Washer (A) [16]

Retainer Damper [17]

Ball Bearing 6008CM [14]

Sleeve [15]

Retaining Ring D40 [13]

Second Hammer [21]

Damper Washer [22]

Damper [23]

Damper Holder [24]

Cylinder [26]

O-ring [20]

Striker [31]

Needle Pin D8 X 6 [25]

Spring Holder (B) [29]

Cylinder Case [37]

Thrust Washer (B) [40]

O-ring (D) [39]

Clutch Spring [30]

Lock Spring [27]

Lock Sleeve [28]

Clutch [33]

Bevel Gear [41]

Fig. 8

Fig. 9

-16-

2. Application of lubricant

Filling special grease (for hammer and hammer drill)

Clutch [33] side in the Cylinder Case [37]: 10 g

Connecting Rod [36] side in the Crank Case [115]: 70 g

Application of special grease (for hammer and hammer drill)

Apply special grease (for hammer and hammer drill) to the inner circumference of the Connecting

Rod [36], sliding portion of the Second Hammer [21], O-ring [20] wound around the Second

Hammer [21], O-ring [32] wound around the Striker [31] and the Piston [35], Oil Seal (NBR710)

[10], Oil Seal [84], Damper [23], inner and outer circumferences of the Bevel Gear [41].

Filling Hitachi Motor Grease No. 29

First Gear [116] side and the Gear Cover [113] side in the Crank Case [115] : 30 g in total

Application of Hitachi Motor Grease No. 29

Apply Hitachi Motor Grease No. 29 to the pinion portions of the Needle Bearing (M661) [118] and

the Armature Ass’y [128], Needle Rollers D8 x 20 [18], Leaf Spring [93] and Weight Pin [92].

3. Tightening torque

Apply screw locking agent TB1401 to all hex. socket head bolts M4, M5, M6 and M8.

Note: Be sure to apply screw locking agent Three Bond TB1401 to the threads during reassembly.

Otherwise, the bolts loosened with vibration may cause damage to the tool body.

M8 Hex. Socket Hd. Bolt (W/Flange) M8 x 35 [38]

for mounting the cylinder case ------------------------- 19.6 N

m (200 kgf

cm)

M8 Seal Lock Hex. Socket Hd. Bolt M8 x 25 [7]

for mounting the front cover ----------------------------- 21.6 ± 1.96 N

m (220 ± 20 kgf

cm)

M6 Seal Lock Hex. Socket Hd. Bolt M6 x 22 [122]

for mounting the gear cover ----------------------------- 9.8 N

m (100 kgf

cm)

M6 Seal Lock Hex. Socket Hd. Bolt M6 x 45 [114]

for mounting the crank case ---------------------------- 9.8 ± 0.98 N

m (100 ± 10 kgf

cm)

M5 Seal Lock Hex. Socket Hd. Bolt M5 x 16 [96]

for mounting the spring holder

Seal Lock Hex. Socket Hd. Bolt M5 x 30 [90]

for mounting the base

Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [85]

for mounting the crank cover

Seal Lock Hex. Socket Hd. Bolt M5 x 16 [67]

for mounting the handle

Hex. Socket Hd. Bolt (W/Flange) M5 x 14 [54]

for mounting the back cover

Hex. Socket Hd. Bolt (W/Flange) M5 x 12 [61]

for mounting the hood

+1.96

+20

+1.96

+20

3.92 ± 0.49 N

m (40 ± 5 kgf

cm)

+1.96

+20

7.84 N

m (80 kgf

cm)

-17-

M4 Seal Lock Hex. Socket Hd. Bolt M4 x 12 [43]

for mounting the change lever -------------------------- 4.41 ± 0.49 N

m (45 ± 5 kgf

cm)

Tapping Screw (W/Flange) D5 ------------------------ 2.94 ± 0.49 N

m (30 ± 5 kgf

cm)

Tapping Screw (W/Flange) D4------------------------- 1.96 ± 0.49 N

m (20 ± 5 kgf

cm)

4. Internal wiring

(1) Wiring diagram for products without noise suppressor

(2) Wiring diagram for products with noise suppressor

Controller circuit

(including noise suppressor)

Switch (B) (1P screw type) w/o lock

Stator ass’y

Plug

rmature ass’y

Pillar terminal

Controller circuit

Switch (B) (1P screw type) w/o lock

Stator ass’y

Plug

rmature ass’y

Connector

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Hitachi DH 50MR Technical Data And Service Manual

Brand: Hitachi

Model: DH 50MR

Category: Rotary hammers

Type: Technical Data And Service Manual

This manual is also suitable for

DH 50MRY

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Hitachi DH 50MR Technical Data And Service Manual

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Hitachi DH 50MR Technical Data And Service Manual

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