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
y
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
D
<New features>
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
<Same features as the conventional models>
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
<Test conditions>
Direction : Downward drilling
Pushing force : 98 N (10 kgf)
Test material : Concrete panel with a compression strength of 2,352 N/cm
2
(240 kgf/cm
2
)
SELLING POINT DESCRIPTIONS
Weight
Leaf spring
0
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
C
B
DH 50MRY
DH 50MR
DH 50MB
Drilling speed comparison
C
B
-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
C
B
Vibration-isolating rubber
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)
+
D
L
(1) Drill bit (Taper shank)
+
(2) Taper shank adapter
(SDS max shank)
(3) Cotter
D
L
+
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
l
L
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
L
L
L
L
L
-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.
l
L
500
g
(
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
50
(2”)
50
(2”)
52
(2-1/16”)
52
(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
2
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
mm
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).
(c) Vibration reduction mechanism
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
y
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 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).
(c) Cylinder [26] and Retainer Sleeve [19]
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
y
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]
!!"# $
%
41
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
0
+20
0
+1.96
0
+20
0
3.92 ± 0.49 N
·
m (40 ± 5 kgf
·
cm)
+1.96
0
+20
0
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
A
rmature ass’y
Pillar terminal
Controller circuit
Switch (B) (1P screw type) w/o lock
Stator ass’y
Plug
A
rmature ass’y
Connector
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