Hitachi H 60MR Manual

TECHNICAL DATA
AND
SERVICE MANUAL
DEMOLITION HAMMER
H 60MR
H 60MRV
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST Nos. H 60MR: E483
H 60MRV: E484
Mar. 2005
H
MODELS
H 60MR
H 60MRV
Hitachi 
Power Tools

REMARK:
Throughout this TECHNICAL DATA AND SERVICE MANUAL, symbols are
used in the place of company names and model names of our
competitors. The symbols utilized here are as follows:
Symbols Utilized
Competitors
Company Name Model Name
BOSCH GSH11E
B
MAKITA HM1202C
C

CONTENTS
Page
1. PRODUCT NAME .............................................................................................................................. 1
2. MARKETING OBJECTIVE ................................................................................................................ 1
3. APPLICATIONS ................................................................................................................................. 1
4. SELLING POINTS ............................................................................................................................. 1
4-1. Selling Point Descriptions ...................................................................................................................2
5. SPECIFICATIONS ............................................................................................................................. 3
5-1. Optional Accessories ..........................................................................................................................4
6. COMPARISON WITH SIMILAR PRODUCTS ................................................................................... 6
6-1. Specification Comparison ...................................................................................................................6
6-2. Demolition Performance Comparison .................................................................................................6
6-3. Full-load Vibration Level Comparison .................................................................................................7
6-4. Full-load and No-load Noise Level Comparison .................................................................................7
7. PRECAUTIONS IN SALES PROMOTION ........................................................................................ 8
7-1. Handling Instructions ..........................................................................................................................8
7-2. Caution Plate ......................................................................................................................................8
7-3. Grease Replacement ..........................................................................................................................8
7-4. O-ring Replacement ............................................................................................................................9
8. REFERENCE INFORMATION ........................................................................................................... 9
8-1. Striking Operation ...............................................................................................................................9
8-2. Idling-proof Mechanism .................................................................................................................... 10
8-3. Shock-absorbing Mechanism ........................................................................................................... 10
8-4. Sealed and Dustproof Construction .................................................................................................. 11
8-5. Vibration Absorbing Construction ..................................................................................................... 11
8-6. Tool Retainer ..................................................................................................................................... 12
8-7. Adjusting Mechanism for the Tool Swivel Angle ................................................................................12
8-8. Side Handle ...................................................................................................................................... 12
9. REPAIR GUIDE ............................................................................................................................... 13
9-1. Precautions and Suggestions for Disassembly and Reassembly of the Main Body .........................13
10. STANDARD REPAIR TIME (UNIT) SCHEDULES ........................................................................ 21
Assembly Diagram for H 60MR
Assembly Diagram for H 60MRV

--- 1 ---
1. PRODUCT NAME
Hitachi Demolition Hammer, Model H 60MR
Model H 60MRV
2. MARKETING OBJECTIVE
The Models H 60MR and H 60MRV are upgraded versions of the current Models H 60MA and H 60MB which
feature the use of maker B's SDS-max shank tools. The performance, durability and operability are greatly
improved. With these new Models H 60MR and H 60MRV and also the current Model H 45MR, we aim to
enhance the share of our hammer series having internal double-insulation construction with sturdy aluminum
frame.
The main specifications are as follows:
(1) High chipping and demolishing performance with low vibration and noise level
(2) Internal double-insulation construction with sturdy aluminum frame
(3) Soft-touch grip for easier handling
(4) D-type side handle with adjustable mechanism for 360ûrotation plus positioning from front to rear
(5) Shock-absorbing mechanism results in prolonged service life.
(6) Simply turning method, variable lock mechanism for easy working-angle adjustment of chisels, etc.
(7) Constant speed and variable speed control (Model H 60MRV only)
(8) A very original design
3. APPLICATIONS
Demolishing and chiseling of concrete
Edging, gravel road digging, compacting and tamping, grooving, cutting, stripping and roughing, etc.
4. SELLING POINTS
High chipping and demolishing performance with low vibration and noise level
A very original design
Shock-absorbing mechanism
results in prolonged service life
Hitachi original design
vibration-abosorbing handle for
excellent vibration reduction
Constant speed and
variable speed control
(Model H 60MRV only)
Internal double-insulation construction
with sturdy aliminum frame
D-type side handle with adjustable
mechanism for 360ûrotation plus
positioning from front to rear
Simply trurning method, variable lock
mehcanism for easy working-angle
adjustment of chisels, etc.
Large trigger switch for
comfortable operation
Soft-touch grip for
easier handling

--- 2 ---
4-1. Selling Point Descriptions
4-1-1. High chipping and demolishing performance with low vibration and noise level
Demolition performance is 1.0 to 1.2 times higher than that of similar products thanks to the maximum 26.0 J
impact energy and efficient striking. The demolition performance is 1.0 to 1.2 times higher than that of similar
products. Even so, the Models H 60MR and H 60MRV produce equivalent or lower vibration and noise level than
that of similar products.
HITACHI
H 60MRV
HITACHI
H 60MR
Ratio of demolished weight %
Full-load vibration level dB (VL)
Full-load noise level dB (A)
No-load noise level dB (A)
100
121.5
91.5
83.0 81.0
Maker .Model HITACHI
H 60MB
HITACHI
H 60MA
79
122.5
94.0
84.0 82.0
BC
98
122.5
94.0
83.0
85
123.0
94.5
80.0
4-1-2. Internal double-insulation construction with sturdy aluminium frame
The aluminum die-cast outer frame is very sturdy (highly rigid). In addition, a plastic internal stator holder is
adopted to realize double-insulation construction. Thus the housing has greater rigidity and the double-insulated
motor has greater durability. The Models H 60MR and H 60MRV are heavy-duty and the service life of the carbon
brushes is prolonged, minimizing disconnection of the armature, deviation of the core and grease leakage.
4-1-3. Soft-touch grip for easier handling
The double-layer molded handle consists of a nylon resin base covered with a soft plastic layer to ensure a soft
touch and firm, non-slip grip of the handles.
4-1-4. D-type side handle with adjustable mechanism for 360ûrotation plus positioning from front to rear
The D-type side handle can be adjusted by 360ûrotation and also allows convenient operation from front to rear.
This side handle has a two-layer plastic construction (integral molding) made of nylon resin as the base and soft
resin around it for a comfortable cushion grip.
4-1-5. Shock absorbing mechanism results in prolonged service life
At the instance of releasing the tool from the workpiece by moving the main body up, the cushion (damper (B))
between hammer holder (B) and the front cover absorbs the striking force of the second hammer. In addition, the
cushion (damper (C)) between the retainer sleeve and the front cover absorbs the striking force of the tool when it
pops up. Thus the Models H 60MR and H 60MRV have greater durability than the similar products.
4-1-6. Simply turning method, variable lock mechanism for easy working-angle adjustment of chisels, etc.
The tool swivel angle can be easily changed in 12 steps by pushing out grip (B) ahead and then turning grip (A).
4-1-7. Constant speed and variable speed control (Model H 60MRV only)
The Model H 60MRV is equipped with an electronic control circuit for stepless adjustment of striking speed. The
striking speed can be adjusted between 930 to 1,650 times per minute by turning the dial according to the
operation (chipping and demolishing) and the workpiece (Fig. 1). The constant speed control provides excellent
operability. The table below shows the striking speed per minute of each dial setting.

--- 3 ---
Fig. 1
Dial setting
6
5
4
3
2
1
Striking speed/min.
1,650
1,590
1,460
1,320
1,110
930
4-1-8. Original design vibration-absorbing handle (Vibration-absorbing is significantly improved)
Hitachi's original design vibration-absorbing handle minimizes vibration through the rolling and compression of
four cylindrical rubber cushions on inclined surfaces. The spring constant factor is as low as that of the Models
H 41SC, H 45MR, H 45SR, H 45FRV and H 60KA, and the cushioning structure greatly reduces vibration.
Dial
Switch
Type of handles
Power input
Full-load current
Striking speed
Weight
Packaging
Standard accessories
Materials: Aluminum alloy die casting
Nylon resin (Crank cover, crank case cover, back cover, tail cover
and handle)
Paint: Silver green metallic, green gray and black
Trigger switch (with stopper)
D-shaped handle and side handle
1,350 W
11.8 A (120 V), 6.2 A (230 V) 13.6 A (110 V), 12.5 A (120 V),
6.5 A (230 V), 6.3 A (240 V)
No-load: 2,160 min-1 No-load: 930 to 1,840 min-1
Full-load: 1,650 min-1 Full-load: 930 to 1,650 min-1
Product: 10.5 kg (23.1 lbs.); excluding cord and side handle
Packed: 17.0 kg (37.5 lbs.)
Corrugated cardboard box with plastic tool case
Bull point 280 mm (11-1/32") •••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1 pc.
Side handle •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1 pc.
Hex. bar wrench (for M8) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1 pc.
Plastic tool case •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1 pc.
Single-phase AC 50/60 Hz
Item
Power source
Voltage
Motor type
Insulation structure
Enclosure
5. SPECIFICATIONS
AC single-phase series commutator motor
110 V, 120 V, 230 V, 240 V
Double insulation
H 60MR H 60MRV

--- 4 ---
+
+
5-1. Optional Accessories
1. Demolishing work
(1) Bull point (SDS-max shank type)
2. Grooving and chiseling work
Code No.
313471
313472
(1) Cold chisel (SDS-max shank type)
+
3. Cutting and stripping work (asphalt cutting etc.)
(1) Cutter (SDS-max shank type)
4. Digging (substitute pick-ax)
Overall length
280 mm (11-1/32")
400 mm (15-3/4")
Code No.
313473
313474
Overall length
280 mm (11-1/32")
400 mm (15-3/4")
Overall length
400 mm (15-3/4")
Width
50 mm (2")
Code No.
313475
Overall length
400 mm (15-3/4")
Code No.
313476
(1) Scoop (SDS-max shank type)
+

--- 5 ---
5. Roughing surface work
Overall length
220 mm (8-21/32")
Code No.
313479
(1) Bushing tool
++
(2) Shank (SDS-max shank type)
Code No.
313477
6. Tamping work
Overall length
220 mm (8-21/32")
Code No.
313479
(1) Rammer
++
(2) Shank (SDS-max shank type)
Code No.
313478
150 mm x 150 mm
7. Grease for impact drill
500 g (1.1 lbs.) Can
Code No. 980927
70 g (2.5 oz) Tube
Code No. 308471
30 g (1 oz) Tube
Code No. 981840
NOTE: Code numbers listed above are subject to change without notice. Please refer to periodic
Technical News Bulletins.

--- 6 ---
C
H 60MA
.
H 60MB
143
169
134
200
0100
Demolished amount
(kg/30 min.)
At rated
voltage
230 V
50 Hz
25
B166
H 60MR
.
H 60MRV
12575
50 150 175
H 65MR
6. COMPARISON WITH SIMILAR PRODUCTS
6-1. Specification Comparison
Maker
Model name
Power input
Striking energy per stroke
Full-load impact rate
W
J
min-1
HITACHI
1,350
121.5
kg
Weight (without cord and
side handle)
Double insulation
91.5
10.5
(23.1 lbs.)
Full-load vibration level
dB (A)
Insulation structure
Full-load noise level
Dimensions
dB (VL)
H 60MRV
6-2. Demolition Performance Comparison
The data shown in Fig. 2 are obtained in actual factory tests, and are for reference only. Demolished amount may
vary in accordance with operating conditions, operator skill, etc.
dB (A)
No-load noise level
Length
Height
Width
mm
mm
mm
576
(22-43/64")
290
(11-27/64")
121
(4-49/64")
26.0 7.0 to 26.0
83.0 81.0
1,650 930 to 1,650
H 60MA
1,300
122.5
Double insulation
94.0
10.5
(23.1 lbs.)
H 60MB
576
(22-43/64")
280
(11-1/32")
121
(4-49/64")
25.0 6.0 to 25.0
84.0 82.0
1,600 900 to 1,600
B
6.0 to 25.0
83.0
900 to 1,890
1,500
122.5
94.0
570
(22-7/16")
270
(10-5/8")
118
(4-21/32")
10.1
(22.2 lbs.)
Double
insulation
C
11.0 to 21.9
80.0
950 to 1,900
1,450
123.0
94.5
578
(22-49/64")
250
(9-27/32")
112
(4-13/32")
9.3
(20.5 lbs.)
Double
insulation
Fig. 2

--- 7 ---
100
95
70
75
80
85
90
HITACHI
H 60MR
HITACHI
H 60MRV
HITACHI
H 60MA
HITACHI
H 60MB BC
Full-load noise level
No-load noise level
6-3. Full-load Vibration Level Comparison
The graph shown in Fig. 3 illustrates the relationship between handle pressing force and handle vibration level in
the Z direction.
6-4. Full-load and No-load Noise Level Comparison
The graph shown in Fig. 4 illustrates the relationship of the noise levels at actual-load operation and no-load
operation measured 1 m away from the main body.
Fig. 3
Fig. 4
Nosie level (dB (A))

--- 8 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Models H 60MR and H 60MRV Demolition
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 attached to each tool.
7-1. 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 Demolition Hammer 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.
7-2. Caution Plate
Each unit of the Models H 60MR and H 60MRV 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 the U.S.A. and Canada
For Australia, New Zealand and India
7-3. Grease Replacement
The striking portion and the speed reduction portion of the Models H 60MR and H 60MRV respectively use
different types of grease. Grease replacement is required if the unit is disassembled for maintenance or O-rings
become damaged and worn as described in 7-4. The striking portion uses special grease. If the striking portion
(inside the cylinder case and crank case) is disassembled, thoroughly remove all of the old grease from each part.
On reassembly, insert 80 g (2.8 oz) of new grease into the crank case (connecting rod side). Do not exceed the
designated amount of grease. Excessive grease insertion may cause reduced striking performance.
The speed reduction portion (inside the gear cover) uses Hitachi Motor Grease No. 29 (Code No. 930035).
The proper supply volume is 40 g (1.4 oz). Never use the striking portion special grease in the speed reduction
portion. Special grease would leak into the motor portion and cause subsequent trouble.

--- 9 ---
7-4. O-ring Replacement
The O-ring (mounted on the striker and piston) are extremely important to ensure adequate sealing of the air
pressure. Although the O-rings are made of special rubber to give them a long service life, they do nonetheless
become worn, and should be replaced by new ones periodically depending on frequency of use of the tool.
With average use, it is recommended that the O-rings be replaced at least every six months to ensure maximum
effectiveness.
Fig. 5
8-1. Striking Operation
The rotation of the armature is transferred to the crank shaft and connecting rod, which in turn cause the piston to
reciprocate inside the cylinder. As the piston reciprocates, the changing air pressure inside the air chamber
between the piston and the striker causes the striker to continuously strike against the end of the second hammer.
At the same time, the air-cushion effect within the air chamber absorbs the impact of the striker. Should the air
escape from the air chamber, the air-cushion effect would cease, and the impact energy would not be absorbed.
Accordingly, the O-rings mounted on the striker and the piston play an extremely important role in sealing the air
within the air chamber.
Second hammer
Armature
Connecting rod
Piston Crank shaft
O-rings
Air chamber
Striker
Cylinder
Crank cover
8. REFERENCE INFORMATION
Structure:

--- 10 ---
8-2. Idling-proof Mechanism
When the bull point is released from the concrete surface, the second hammer moves to the position illustrated in
Fig. 6, and the striker moves out of striking position. When this occurs, the air holes are opened and the pressure
within the air chamber remains unchanged even though the piston continues to reciprocate, thereby preventing
striking operation.
Fig. 6
Air
chamber
Striker
Second hammer
Forward movement of
second hammer & striker Air hole
8-3. Shock-absorbing Mechanism
At the instance of releasing the tool from the workpiece by moving the main body up, the second hammer
contacts hammer holder (B) then the cushion (damper (B)) provided between the hammer holder (B) and the front
cover absorbs the striking force of the second hammer. In addition, the tool contacts the needle roller then the
cushion (damper (C)) provided between the retainer sleeve and the front cover absorbs the striking force of the
tool when it pops up. Thus the durability of the Models H 60MR and H 60MRV is increased greatly because the
tool and the second hammer do not strike the tool retainer directly.
Fig. 7
Second hammer Hammer holder (B)Tool
Retainer sleeve Damper (B)
Damper (C)
Needle roller

--- 11 ---
Fig. 8
Front cover
Vibration absorbing unit
Needle roller
Retainer sleeve
Switch handle
O-ring
O-ring O-ring
Crank case
Tool
O-ring
Housing
Cylinder case O-ring
Vibration absorbing unit
8-4. Sealed and Dustproof Construction
The cylinder case and the crank case are sealed by five O-rings and an oil seal which serve to prevent leakage of
the grease, as well as to prevent dust and dirt from entering the mechanism.
8-5. Vibration Absorbing Construction
Hitachi original, innovative units which absorb vibration are installed between the switch handle and the crank
case and between the switch handle and the housing. As a result, the amount of vibration transmitted from the
main body to the arms of the operator is considerably less in comparison with conventional hammers.
Construction of vibration absorbing unit:
The main body (crank case and housing) and the
handle are connected through four cylindrical rubbers
(handle dampers). Vibration is absorbed by the rolling
and compression of the four rubbers on inclined
surfaces. Because the vibration absorbing unit has
non-linear spring characteristics, its spring constant
factor is lower than that of the conventional shearing
rubber type vibration-absorbing construction, and it
provides significantly higher efficiency in minimizing
vibration. In addition, the interlocking slotted groove
and the cylindrical convex portions at the center prevent
the handle from being disconnected by twisting or
pulling, a common problem with conventional hammers. Fig. 9
Oil seal

--- 12 ---
8-6. Tool Retainer
The Models H 60MR and H 60MRV are equipped with a slide-type tool retainer. Tools can be attached and
detached just by pulling grip (A). While pulling grip (A) in A direction, insert the tool in the hole of the front cap
(Fig. 10). Adjust the groove position by turning the tool and push it in to the end. Lock the tool by returning grip
(A) back to the original position.
Fig. 10
Grip (A)
Front cap
Tool shank
8-7. Adjusting Mechanism for the Tool Swivel Angle
The tool swivel angle can be easily changed in 12 steps. The tool swivel angle can be set freely to the desired
position by pushing out grip (B) ahead in A direction and then turning grip (A) in B or C direction. (Fig. 11)
Fig. 11
Grip (A)
Grip (B)
8-8. Side Handle
The side handle can be adjusted by 360ûrotation and also allows operation from front to rear. Loosen the handle
by turning the grip in A direction and adjust the handle to a convenient position. Turn the grip in B direction to
fix the side handle. (Fig. 12)
Fig. 12
Grip
B
A
B
A
C
A
A

--- 13 ---
9. PEPAIR GUIDE
9-1. Precautions and Suggestions for Disassembly and Reassembly of the Main Body
The numbers in [Bold], <Bold> and <<Bold>> correspond to the item numbers in the Parts List and exploded
assembly diagrams.
([Bold]: H 60MR and H 60MRV, <Bold>: H 60MR only, <<Bold>>: H 60MRV only)
Fig. 14
Remove the Ring [3] by means of a snap ring remover, then the Needle Holder [4], two Needle Rollers
D8 x 20 [13] and Spring (A) [5] can be removed from the Retainer Sleeve [14]. Remove the Retaining Ring
D42 [6] by means of a snap ring remover, then the Ball Holder [7], Grip (B) [8] and the four Steel Balls D 6.35
[10] can be removed from the Front Cover [12] (Fig. 14). Furthermore, remove the Seal Lock Hex. Socket Hd.
Bolts M8 x 25 [11] fixing the Front Cover [12], then the Retainer Sleeve [14], Damper (C) [104], Front Cover
[12], Hammer Holder (B) [18], Damper (B) [17], Second Hammer [19], Hammer Holder (A) [20], Damper (A)
[21] and Damper Washer [22] can be removed from the Cylinder Case [24].
Retaining Ring D42 [6]
Needle Holder [4]
Needle Roller
D8 x 20 [13]
9-1-1. Disassembly
Tool retainer disassembly (See Figs. 13 and 14.)
Pull Grip (A) [2] fully in the arrow direction as
shown in Fig. 13 and remove the Front Cap [1]
(since the Front Cap [1] is made of rubber and
engaged firmly with the Retainer Sleeve [14],
pull it strongly to remove). This allows Grip (A)
[2] to be separated from the Retainer Sleeve
[14].Fig. 13
Front Cap [1] Grip (A) [2]
Grip (B) [8]
Ball Holder [7]
Steel Ball D6.35 [10]Spring (A) [5] Front Cover [12]
Ring [3]
Retainer
Sleeve [14]

--- 14 ---
First gear and crank shaft disassembly
Remove the grease from the Connecting Rod [31] side and the First Gear [54] side of the Crank Case [34].
Remove the two Seal Lock Hex. Socket Hd. Bolts M5 x 14 [40] fixing the Bearing Cover [41]. Then place the
Connecting Rod [31] side of the Crank Case [34] downward on a workbench and apply pressure on the end
surface of the Cranck Shaft [38] with a hand press to remove the First Gear [54] and the Crank Shaft [38]
(Fig. 16). Before removing them, make sure that the two Seal Lock Hex. Socket Hd. Bolts M5 x 14 [40] fixing
the Bearing Cover [41] are removed.
Piston and striker disassembly
Remove the Hex. Socket Hd. Bolts M5 x 12 [45] fixing the Crank Case Cover [82] and the Seal Lock Hex.
Socket Hd. Bolts M5 x 16 [36] fixing the Crank Cover [37]. Remove the Crank Case Cover [82] and the Crank
Cover [37] from the Crank Case [34] in order as shown in Fig. 15. Remove the Hex. Socket Hd. Bolts (W/
Flange) M8 x 30 [25] fixing the Cylinder Case [24], and disassemble the Cylinder Case [24] from the Crank
Case [34]. As the Piston [30] remains in the Crank Case [34] side, remove the Retaining Ring for D14 Shaft
[32] to remove the Connecting Rod [31] from the Crank Shaft [38].
The Striker [27] can be removed by tapping the Cylinder Case [24] lightly with a plastic hammer. If it does not
come out easily, push the disassembled Piston [30] with the Connecting Rod [31] back into the cylinder, and
pull them apart again quickly. The Striker [27] can come out at the same time.
Fig. 15
Crank Cover [37]
Crank Case Cover [82]
Crank Case [34]
Fig. 16
Crank Case [34]
Crank Shaft [38] First Gear [54]
Bearing Cover [41]
Apply pressure on the end surface
of the crank shaft with a hand press.
Workbench

--- 15 ---
9-1-2. Reassembly
Reassembly can be accomplished by following the disassembly procedures in reverse. However, special
attention should be given to the following items.
First gear and crank shaft reassembly
Press-fit the Ball Bearing 6204DDCMPS2L [42] in the Crank Case [34] and fix the Bearing Cover [41] with the
two Seal Lock Hex. Socket Hd. Bolts M5 x 14 [40]. Press-fit the Crank Shaft [38]. Then press-fit Distance
Ring (C) [53] and mount the Oil Seal [52]. Put the Feather Key 3 x 3 x 10 [39] into the groove of the Crank
Shaft [38] and press-fit the First Gear [54] with a suitable tool while holding the flat portion of the Crank Shaft
[38] with a steel bar. Before press-fitting, make sure that the Feather Key 3 x 3 x 10 [39] fits in the key groove
of the First Gear [54]. (Fig. 17)
Fig. 17
Crank Case [34]
Oil Seal [52]
Bearing Cover [41]
First Gear [54]
Feather Key
3 x 3 x 10 [39]
Distance Ring (C) [53]
Seal Lock Hex. Socket
Hd. Bolt M5 x 14 [40]
Ball Bearing
6204DDCMPS2L [42]
Crank Shaft [38]
Steel bar
Damper (C) assembly
Keeping Damper (C) [104] fitted in the groove around the Retainer Sleeve [14], mount the Retainer Sleeve
[14] to the Front Cover [12] (Fig. 18).
Fig. 18
Front Cover [12] Damper (C) [104]
Retainer Sleeve [14]
Suitable tool
Groove

--- 16 ---
Lubrication
Apply special grease (grease for electric impact drills) to the inner circumference of the Connecting Rod [31],
O-rings (A) (FPM810) [28] in the Striker [27] and in the Piston [30], the outer circumference of the Retainer
Sleeve [14], the sliding portion of the Second Hammer [19], Oil Seal [52], Damper (A) [21], Damper (B) [17],
Damper (C) [104], Damper Washer [22] and the end surface of Spring (A) [5]. Seal 80 g (2.8 oz) of the
special grease into the Crank Case [34] (the Connecting Rod [31] side).
Apply Hitachi Motor Grease No. 29 to Needle Bearing (A) [55], the pinion portion of the Armature Ass'y [60],
the Steel Ball D6.35 [10] and the Needle Roller D8 x 20 [13]. Seal 40 g (1.4 oz) of the Hitachi Motor Grease
No. 29 into the Crank Case [34] (the First Gear [54] side).
Oil seals
Be very careful not to damage the O-ring (S-26) [15] in the Retainer Sleeve [14], O-ring (S-32) [16] on the
Retainer Sleeve [14], O-ring (S-56) [23] on the Front Cover [12], O-ring (1AS-60) [26] on the Cylinder Case
[24], O-ring (S-75) [43] in the Crank Cover [37], O-rings (A) (FPM810) [28] in the Striker [27] and in the Piston
[30] and Oil Seal [52] in the Crank Case [34].
9-1-3. Screw locking agent TB1401
Apply screw locking agent TB1401 to all hex. socket hd. bolts M5 and M6. (As the hex. socket hd. bolts for M8
that secure the front cover and the hex. socket hd. bolts (w/flange) for M8 that secure the cylinder case are
special bolts, they cannot be re-used if removed. Use fresh service parts only.)
CAUTION: If bolts are loosened by vibration, it could cause damage to the hammer body. Ensure without
fail that screw locking agent is applied to threaded portions prior to reassembly.
9-1-4. Tightening rorque
(1) Attached bolts of front cover 39.2 0.98 N.m (400 10 kgf.cm, 347.2 8.7 in-lbs.)
(Seal Lock Hex. Socket Hd. Bolts M8 x 25 [11])
(2) Attached bolts of cylinder case 19.6 N.m (200 kgf.cm, 173.6 in-lbs.)
(Hex. Socket Hd. Bolts (W/Flange) M8 x 30 [25])
(3) Seal Lock Hex. Socket Hd. Bolts M6 [33], [35] 9.80 N.m (100 kgf.cm, 86.8 in-lbs.)
(4) Seal Lock Hex. Socket Hd. Bolts M5 [36], [40] 7.84 N.m (80 kgf.cm, 69.4 in-lbs.)
(5) Attached bolts of tail cover 4.41 0.49 N.m (45 5 kgf.cm, 39.1 4.3 in-lbs.)
(Seal Lock Hex. Socket Hd. Bolts M5 x 22 [78])
(6) Attached bolts of crank case cover and back cover 3.92 0.49 N.m (40 5 kgf.cm, 34.7 4.3 in-lbs.)
(Hex. Socket Hd. Bolts M5 x 12 [45])
(7) Attached bolts of handle 4.90 N.m (50 kgf.cm, 43.4 in-lbs.)
(Seal Lock Hex. Socket Hd. Bolts M5 x 12 [91])
(8) Hex. Hd. Tapping Screws D5 x 50 [62] 2.94 0.49 N.m (30 5 kgf.cm, 26.0 4.3 in-lbs.)
(9) Tapping Screws (W/Flange) D4 1.96 0.49 N.m (20 5 kgf.cm, 17.4 4.3 in-lbs.)
<98>, <100>, <<97>>, <<98>>
+1.96
0
+20
0+17.4
0
+1.96
0
+20
0
+17.4
0
+1.96
0+20
0
+17.4
0
+1.96
0+20 0
+17.4
0

--- 17 ---
9-1-5. Internal wiring
Wiring diagram of the Model H 60MR (products without control circuit ass'y)
(1) For products with noise suppressor
Fig. 19
(2) For products without noise suppressor
Fig. 20
Black
Black
Black
Yellow
Wiring diagram of the Model H 60MRV (products with control circuit ass'y)
110 V
230 V
240 V
120 V (USA)
Black
White
White
Yellow
Internal wire
Voltage A B Fig. 21