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MODEL
H 70SA
HAMMER
H 70SA
POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
H
LIST No. E459 Aug. 2000
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
Notice for use
Specifications and parts are subject to change for improvement.
Refer to Hitachi Power Tool Technical News for further information.
CONTENTS
Page
1. PRODUCT NAME
Hitachi Electric Hammer, Model H 70SA
2. MARKETING OBJECTIVE
The Model H 70SA has been developed based on the current Model H 65SB, which features the use of Hitachi
30 mm hexagonal tools. While the Model H 65SB has a D-shaped handle, the Model H 70SA has a T-shaped handle intended for downward chipping and demolishing. The compact Model H 70SA broadens our lineup of
90-class hammers (T-shaped handle).
3. APPLICATIONS
Demolishing of concrete and similar materials
Groove and channel digging in concrete
Groove and channel digging in asphalt and gravel roads
Tamping/compacting of asphalt and graveled roads
Cuting of asphalt
[Typical applications]
Construction work, piping/wiring work, water supply/drain work, etc.
4. SELLING POINTS
This hammer is the only one which is specifically designed for downward chipping and demolishing in the 65 --- 70 class.
T-shaped handle with shock absorber reduces operator fatigue.
Dustproof double air vent construction protects against concrete chips.
More compact and lightweight than
90-class hammers (T-shaped handle)
Internal double-insulation construction with sturdy aluminum frame
--- 1 ---
4-1. Selling Point Descriptions
4-1-1. Highest chipping and demolishing performance in its class
The powerful impact force of each blow ensures efficient and easy demolition of concrete. The demolition performance is 1.0 --- 1.3 times more powerful than that of similar products.
Maker
•
Model
HITACHI H 70SA
HITACHI H 65SB
C
Ratio of demolished weight (%)
100
100
79
4-1-2. T-shaped handle with shock absorber reduces operator fatigue
The T-shaped handle is equipped with the Hitachi's original shock absorber. Vibration transmitted from the tool main body is effectively absorbed and vibration transmitted to handle (B) and the side handle is minimized by compressing and shearing the two blocks of rubber mounted between the housing and handle (B) and between the housing and the side handle. The T-shaped handle improves downward chipping and demolishing performance and reduces operator's fatigue for a long-time operation.
4-1-3. Dustproof double air vent construction protects against concrete chips
A fine mesh is mounted between the tail cover and the housing which act as the air vent (inlet) for the motor cooling fan. The double air vent construction prevents concrete chips from entering in the motor directly (Fig. 1).
Housing
Tail cover
Tail cover
Housing
Cooling air
Concrete chip
Cooling air
Mesh
Fig. 1
--- 2 ---
4-1-4. More compact and lightweight than 90-class hammers (T-shaped handle)
Maker
•
Model
HITACHI H 70SA
HITACHI H 90SC
HITACHI H 90SE
BOSCH USH 27
MAKITA HM 1800
Weight
18 kg (39.7 lbs.)
32 kg (70.5 lbs.)
32 kg (70.5 lbs.)
29 kg (63.9 lbs.)
29 kg (63.9 lbs.)
Overall length
625 mm (24-5/8")
842 mm (33-5/32")
859 mm (33-13/16")
845 mm (33-1/4")
818 mm (32-7/32")
The Model H 70SA is lighter than the 90-class hammers (T-shaped handle) by 11 to 14 kg (24.2 to 30.8 lbs.) in weight and shorter by 193 to 234 mm (7-19/32" to 9-7/32") in length since it has been developed based on the current Model H 65SB which features the use of Hitachi 30 mm hexagonal tools.
5. SPECIFICATIONS
Power source
Item
Voltage (V)
Motor type
Insulation structure
Enclosure Material
Paint
Switch
Type of handle
Full-load current
Power input
Striking speed
Weight
No-load
Full-load
Product
Packed
Packaging
Standard accessories
H 70SA
Single-phase AC 50/60 Hz
110, 115, 230, 240
AC single-phase series commutator motor
Double insulation
Aluminum alloy die casting, Cast aluminum alloy,
Glass-fiber reinforced plastic resin
Hammer-net silver green and black
Trigger switch
T-shaped handle
11.8 A (110 V), 11.4 A (115 V), 5.7 A (230 V), 5.4 A (240 V)
1,240 W (for Australia only 1,400 W)
1,850 /min.
1,400 /min.
18.0 kg (39.7 lbs.); excluding cord
24.5 kg (54.0 lbs.)
Corrugated cardboard box
Bull point 410 mm (16-1/8")
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
1
Hex. bar wrench (for M8)
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
1
Hex. bar wrench (for M4)
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
1
--- 3 ---
5-1. Optional Accessories
1. Grooving and chiseling work
+
(1) Cold chisel
Overall length
410 mm (16-1/8")
2. Cutting and stripping work (asphalt cutting, etc.)
Code No.
944962
+
(1) Cutter
Width
75 mm (2-15/16")
3. Digging work (substitute pick-ax)
Overall length
410 mm (16-1/8")
Code No.
944964
+
4. Tamping work
(1) Scoop
Overall length
380 mm (15")
+
Code No.
319298
+
(1) Rammer
Diameter
200 mm (7-7/8")
Code No.
944965
(2) Shank
Overall length
250 mm (10")
Code No.
944966
--- 4 ---
5. 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. Please refer to periodic Technical News Bulletins.
--- 5 ---
6. COMPARISONS WITH SIMILAR PRODUCTS
6-1. Specification Comparisons
Maker
Model name
Power input
Full-load impact rate
Dimensions
(illustration below)
A
B
C
W min mm mm mm
-1
Striking energy per stroke
Insulation structure
Lubricating method
Vibration-absorbing handle
No-load noise level
Full-load noise level
Vibration level
Weight (without cord)
J
---
---
--dB(A) dB(A) m/s
2 kg
H 70SA
1,240*
1,400
625
(24-5/8")
554
(21-13/16")
237
(9-5/16")
42.0
Double insulation
HITACHI
H 65SB
1,240*
1,400
726
(28-19/32")
120
(4-23/32")
235
(9-1/4")
42.0
Double insulation
Grease
Provided
85.0
102.1
14.0
18.0
(39.7 Ibs.)
Grease
Provided
87.0
102.2
19.0
16.0
(35.3 Ibs.)
* for Australia only 1,400 W
C
1,240
1,200
613
(24-1/8")
520
225
(8-7/8")
46.8
Double insulation
Grease
Not provided
93.5
101.9
20.0
17.0
(37.5 Ibs.)
C
B
A
A
A
B
B
--- 6 ---
C
H 65SB
6-2. Demolition Performance Comparisons
The data shown in Fig. 2 are obtained in actual factory tests, and are for reference only. The demolished amount may vary in accordance with operating conditions, operator skill, etc.
100 150
200
250
Demolished amount
(kg/30 min.)
H 70SA 203 (448 lbs.)
At rated voltage
H 65SB
203 (448 lbs.)
C
161 (355 lbs.)
Fig. 2
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Model H 70SA Electric Hammer 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 Electric 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
The Model H 70SA unit is provided with a Nameplate (illustrated below) which lists basic safety precautions in its use. Carefully ensure that the customer fully understands and follows these precautions before using the tool.
For Australia
--- 7 ---
7-3. Grease Replacement
Different kinds of grease are used in the electro-pneumatic hammering section and the speed-change gear section. It is not necessary to replenish the grease between 6-month (approx.) change intervals unless the tool is disassembled or there is grease leakage due to a damage or worn seal.
To ensure the smooth reciprocating of the striker and the second hammer, special grease (Part No. 980927 or 981840 or 308471 for impact drill) is used in the hammering section. If the hammering section [inside the cylinder case and housing (crank shat side)] is disassembled, thoroughly wipe away all old grease from all parts, and apply 30 g (1 oz) of new grease within the cylinder case and 40 g (1.4 oz) of new grease within the housing (crank shaft side). Do not exceed the designated amounts of grease. If there is excessive grease, it may flow between the striker and piston and cause reduced hammering efficiency and/or increased recoil force.
N.P.C. SEP-3A (Part No. 930035) is used in the speed-change gear section (inside the gear cover). The proper supply amount is 80 g (2.8 oz). Never use the hammering section special grease in the speed-change section.
The special soft grease would leak into the motor section and cause serious problems.
7-4. O-Ring Replacement
The O-ring mounted on the piston is extremely important to ensure adequate sealing of the air pressure.
Although the O-Ring is made of special rubber to ensure a long service life, it does nonetheless become worn and should be replaced periodically depending on frequency of tool use. With average use, it is recommended that the O-ring should be replaced every six months to ensure maximum effectiveness.
--- 8 ---
8. REFERENCE INFORMATION
8-1. Sealed and Dustproof Construction
The cylinder case section and housing (crank case side) are sealed by four (4) O-rings, a holder seal and a seal ring. These seals serve to prevent leakage of the grease, as well as to prevent dust and dirt from entering the mechanism.
O-ring
(59.6 mm (2-11/32") inner dia.)
O-ring (44.4 mm (1-3/4") inner dia.)
O-ring
(64.4 mm (2-17/32") inner dia.) O-ring
(23.7 mm (15/16") inner dia.)
Seal ring
Gear cover
Cylinder case
Holder seal
Housing
Fig. 3
8-2. Vibration-Absorbing Construction
(1) Vibration-absorbing construction
The handle holders which secure handle (B) and the side handle to the housing can be smoothly turned thanks to the handle pins inserted in the slotted through holes at both sides of the housing. The handle pins are supported by dampers (B) fitted into the slotted through holes so that they can be moved in the axial direction of the tool. Two blocks of rubber (handle dampers (B)) are inserted between the housing and the handle holder. By pressing the handle portion, the handle holder turns and handle damper (B) is compressed and sheared according to the movement of the main body. Damper (B) is also compressed when it comes in contact with the handle pin. Thus, vibration transmitted from the main body to the handle portion is minimized.
The four cylindrical rubbers (handle dampers) cushion the shock generated between the housing and the handle holder when the handle holder returns to the original position. The T-shaped handle with shock absorber improves downward chipping and demolishing performance and reduces operator's fatigue for a long-time operation.
--- 9 ---
Switch lever
Housing
Handle damper
Damper (B)
Side handle
Handle (A) (B)
Handle holder
Handle damper (B)
Handle holder
Handle holder
Handle pin
Slotted through hole Damper (B)
Housing
Fig. 4
--- 10 ---
(2) Level of handle vibration in Z direction
The graph below illustrates the relationship between handle pressing force and handle vibration level in the Z direction.
126.0
125.0
124.0
123.0
122.0
121.0
HITACHI H70SA
C
Z
Z
49 98 147
196
245
Pressing force (load) (N)
(Note) For improved operability in chipping and breaking operations, it is recommended that operating force be limited to the dead weight of the tool rather than pressing forcefully down on the handles. In keeping with this, the handle pressing force at which the vibration-absorbing effect is maximum is set for between 5 kg (11.0 lbs.) and 10 kg (22.0 lbs.). The customer should be cautioned to avoid pressing fully down on the handles during operation.
--- 11 ---
8-3. Stop Lever [Tool Retainer]
To attach and detach the tool (bull point, etc.), as shown in Fig. 5, pull the stop lever in the direction of arrow, and turn it 180˚. Then, fully insert the tool into the hexagonal hole of the front cover.
Hold the tool with its flattened part directed upward.
2
Front cover
Tool shank
3
1
Stop lever
Fig. 5
8-4. Movement of the Stop Lever
After an extended period of use, the operation of the stop lever may become difficult due to incursion of concrete powder or similar materials into its sliding portion. In such a case, apply oil into the sliding portion between the stop lever and fitting portion of the front cover.
--- 12 ---
9. REPAIR GUIDE
9-1. Precautions and Suggestions for Disassembly and Reassembly of the Main Body
The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram.
9-1-1. Disassembly
[NOTE] If it is difficult to loosen and remove the fixing bolts, use an appropriate heating device to heat them to
approximately 80˚C (176˚F).
Disassembly of the Armature Ass'y [88]
(1) Loosen the four Seal Lock Hex. Socket Hd. Bolts M4 x 12 [56], remove the Cap Covers [57], Cap Rubbers
[58] and Brush Caps [59], and take out the Carbon Brushes [60]. At this time, be very careful not to lose the
disassembled parts.
(2) Loosen the four Nylock Hex. Socket Hd. Bolts M8 x 35 [22], and remove the Cylinder Case [19]. Next, after loosening the Seal Lock Hex. Socket Hd. Bolt M8 x 16 [31], the Connecting Rod Ass'y [28] and Crank Washer
[30] can be disassembled. Leave the Striker [21] and Piston [26] as they are.
(3) Loosen the six Seal Lock Hex. Socket Hd. bolts M6 x 45 [62], and disassemble the Gear Cover [33] and
Counter Gear [64]. Then, by inserting a flat-blade screwdriver or similar tool into one of the air vents of the
Inner Cover [37] and lifting it upwards, the Inner Cover [37], Armature Ass'y [88], Crank Shaft [42], and related parts can be removed in a single body.
(4) As illustrated in Fig. 6, support the Inner Cover [37] with an appropriate tubular jig, and push down on the end surface of the armature shaft with a hand press to separate the Armature Ass'y [88] from the Inner Cover [37].
Press the end surface of the armature shaft with a hand press.
Inner Cover [37]
Crank Shaft [42]
Armature Ass'y [88]
Tubular jig
Fig. 6
Disassembly of the Crank Shaft [42] section
First, remove the four Seal Lock Hex. Socket Hd. Bolts M5 x 16 [41] which fix the Bearing Cover [40]. Then, as illustrated in Fig. 7, support the lower surface of the Inner Cover [37] with an appropriate tubular jig, align an appropriate steel rod with the end surface of the Crank Shaft [42], and press down on the steel rod with a hand press. The Ball Bearing 6205DDCM [39], Distance Ring (B) [36], Final Gear [35], two Woodruff
Keys 4 x 16 [43], and Crank Shaft [42] can then be disassembled from the Inner Cover [37].
--- 13 ---
Press the end surface of the Crank Shaft by fitting a steel rod with a hand press.
Ball Bearing [34]
Final Gear [35]
Inner Cover [37]
Crank Shaft [42]
Tubular jig
Fig. 7
Disassembly of remaining parts from the Inner Cover [37]
Loosen the three Seal Lock Hex. Socket Hd. Bolts M5 x 16 [41], and take out Bearing Cover (A) [66] and the
Ball Bearing 6203DDCM [67].
Disassembly of the Mouth [15] and related parts
First, remove the six Nylock Hex. Socket Hd. Bolts M8 x 30 [10], and separate the Front Cover [7] from the
Cylinder Case [19]. The Second Hammer [8], Shank Sleeve [14], Damper (A) [13], Mouth [15], Mouth Cover
[16], Mouth Washer [17], and Urethane Ring [18] can then be taken out.
Removal of O-Ring (E) [12]
As O-Ring (E) [12] is installed in the inner portion of the Shank Sleeve [14], it may be difficult to remove. As illustrated in Fig. 8, pry O-Ring (E) upward gently with a slender flat-blade screwdriver, being very careful not to damage the surface of the O-ring.
Removal of the Striker [21] and related parts
Remove the four Nylock Hex. Socket Hd. Bolts M8 x 35
[22], and separate the Cylinder Case [19] from the
O-Ring (E) [12]
Housing Ass'y [104]. From the Cylinder Case [19] , take out the Striker [21], Piston [26], and Connecting
Rod Ass'y [28] in a single body.
Holding the Striker [21] firmly in one hand, grasp the
Shank
Sleeve [14]
Connecting Rod Ass'y [28] in the other hand and pull it forcefully to separate it from the striker. Finally, extract the Piston Pin [27]
Fig. 8
from the Piston [26], and separate the Piston from the
Connecting Rod Ass'y [28].
Slender flat-blade screwdriver
Disassembly of Switch (A) [99] and related parts
Pry off the Retaining Ring (E-Type) for D4 Shaft [72] with a small flat-blade screwdriver, pull out the Pin [70], and remove the Switch Lever [71]. Then, remove the two Seal Lock Hex. Socket Hd. Bolts M6 x 30 [46] on the Handle (B) side and the two Tapping Screws (W/Flange) D4 x 20 [103], and remove Handle (B) [102].
--- 14 ---
Disassembly of the Stop Lever [2]
Damper (B) [6]
Lever Spring [5]
Needle Roller [3]
Spring
Case [4]
3 mm dia. hole
Stop Lever [2]
Push Damper (B) [6] with two flat-blade screwdrivers.
Steel rod
(3 mm or less dia.)
Overlap the end surface of the
Stop Lever [2] on the flange portion of the Front Cover [7].
Fig. 9
Disassembly procedures are illustrated in Fig. 9. Pull the Stop Lever [2] outward in the direction indicated by the arrow, and turn it slightly so that its end surface comes to rest on the flange portion of the Front Cover
[7]. Next, turn the Spring Case [4] so that the holes of the spring case are aligned with the Needle Roller [3].
Then, push in Damper (B) [6] with flat-blade screwdrivers to compress the Lever Spring [5]. Finally, while keeping the Lever Spring [5] compressed, fit a 3 mm or less dia. steel rod into the hole of the Spring Case [4], and push out the Needle Roller [3]. The Stop Lever [2], Damper (B) [6], and the Lever Spring [5] can then be taken out.
--- 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.
Reassembly of the Crank Shaft [42] section
Press-fit the Ball Bearing 6205DDCM [39] into the Inner Cover [37], and fasten the Bearing Cover [40] onto the Inner Cover [37] with the four Seal Lock Hex. Socket Hd. Bolts M5 x 16 [41]. Support the inner race of the
Ball Bearing 6205DDCM [39] with an appropriate jig, and press-fit the Crank Shaft [42] into the Ball Bearing.
Next, insert Distance Ring (B) [36] and two Woodruff Keys 4 x 16 [43] into the Crank Shaft [42], and press-fit the Final Gear [35] and Ball Bearing 6302VVCM [34] with a hand press.
Reassembly of the Armature Ass'y [88]
Press-fit the Ball Bearing 6203DDCM [67] into the Inner Cover [37], and fasten Bearing Cover (A) [66] onto the Inner Cover with the three Seal Lock Hex. Socket Hd. Bolts M5 x 16 [41].
Reassembly of the Striker [21] (Two possible methods)
(1) After the Connecting Rod Ass'y [28] has been
assembled into the Housing Ass'y [104], mount the
Piston [26] and press it into the Striker [21].
(2) Mount the Piston [26] onto the Connecting Rod
Ass'y [28], and push down on the Connecting
Rod Ass'y to press the Piston into the Striker [21].
Housing Ass'y [104]
Connecting Rod Ass'y [28]
Piston [26]
Respiratory holes
Striker [21]
Piston [26]
Respiratory holes
Connecting Rod Ass'y [28]
Striker [21]
Fig. 10
Either of the two methods described above requires a pressing force of more than 30 kg. When a "hissing" sound is heard, the Piston [26] is properly inserted in the Striker [21]. (The "hissing" is the sound of the compressed air escaping from the Striker [21] when the Piston [26] reaches the respiratory chambers within the Striker [21].)
--- 16 ---
Reassembly of the Handle Holder [48] section
Mount four Dampers (B) [44] and four Handle Dampers [50] to the Housing Ass'y [104], then mount two
Handle Dampers (B) [49] to the Housing Ass'y [104] in the direction of arrow marked on Handle Damper (B)
[49]
surface. Next, mount two Handle Holders [48] to the Housing Ass'y [104] and insert two Handle Pins
[92] into two 17.5 mm dia. holes of the Handle Holders [48]. Finally, tighten two Seal Lock Hex. Socket Hd.
Bolts M8 x 16 [31] with two Washers [101]. At this time, align the notch of the flange portion of the handle pin with the notch of the Handle Holder [48] and then hold the flange portion of the Handle Pin [92].
Housing Ass'y [104]
Handle Damper (4 pcs.) [50]
Handle Holder (2 pcs.) [48]
Handle Pin (2 pcs.) [92]
Damper (B) (4 pcs.) [44]
Handle Damper (B) (2 pcs.) [49]
17.5 mm dia. holes
Washer (2 pcs.) [101]
Seal Lock Hex. Socket Hd. Bolt M8 x 16 (2 pcs.) [31]
Fig. 11
--- 17 ---
Mounting of Oil Seal (A) [25]
When mounting Oil Seal (A) [25] on the Piston [26], ensure that the lip portion of the Oil Seal is directed toward the rear surface of the Piston [26], as illustrated in Fig. 12. Prior to reassembly, thoroughly coat Oil Seal (A) [25] and O-Ring (A)
[24] with grease (Grease for Impact Drill, Part No. 980927 or
981840 or 308471 is recommended), and carefully ensure they are not damaged.
O-Ring (A) [24]
Oil Seal (A) [25]
Fig. 12
Lip
Piston [26]
Mounting of Seal Ring (A) [38]
To prevent oil from leaking through between the Housing Ass'y [104] and the Inner Cover [37], Seal Ring (A)
[38] is installed in the Inner Cover [37] for sealing grease. When fitting Seal Ring (A) [38] in the ring groove
on the Inner Cover [37], exercise care not to allow the Seal Ring (A) [38] to twist or project out of the groove.
Reassembly of the Stop Lever [2]
Prior to reassembly, thoroughly coat the grease
(Doubrex 251, Part No. 980757, is recommended) on the sliding portion of the Stop Lever [2]. As illustrated in Fig. 13, place the end surface of the Stop Lever [2] on the flange portion of the Front Cover [7] and compress the Lever Spring [5] by pressing the Damper
(B) [6] with two slender minus screwdrivers. Then, align the holes of the Stop Lever [2] and the Spring
Case [4], and insert the Needle Roller [3].
Needle Roller [3]
Stop Lever [2]
Damper (B) [6]
Lever Spring [5]
Spring Case [4]
Fig. 13
9-1-3. Screw Locking Agent TB1401
(1) Prior to reassembly, all M5, M6 hexagon socket hd. bolts and machine screws must be coated with screw locking agent TB1401.
(2) The following parts must be replaced with new Hitachi genuine parts if they are loosened once.
Front cover fixing bolts: Nylock Hex. Socket Hd. Bolt M8 x 30 [10]
Cylinder case fixing bolts: Nylock Hex. Socket Hd. Bolt M8 x 35 [22]
Fixing bolt on the Connecting Rod Ass'y [28] and Handle Holder [48]: Seal Lock Hex. Socket Hd. Bolt M8 x 16 [31]
[CAUTION] If fastening bolts come loose from vibration, it could cause serious damage to the machine.
Ensure without fail that TB1401 screw locking agent is applied as directed above prior to reassembly. Before applying the TB1401, carefully clean any grease or other foreign matter from the male and female threads with gasoline, thinner or similar cleaning solvents.
--- 18 ---
9-1-4. Tightening torque
(1) M4 hexagon socket hd. bolts
(2) M5 hexagon socket hd. bolts
(3) M6 hexagon socket hd. bolts
(4) M8 hexagon socket hd. bolts
(5) D4 tapping screw
4.41 N
• m (45 kgf
• cm, 39.1 in-Ibs.)
7.84 N
0
•
+20 m (80 kgf
•
+12.4
cm, 69.5 in-Ibs.)
0
+20
0
+17.4
9.80 N
• m (100 kgf
• cm, 86.9 in-Ibs.)
+1.96
29.4 N
•
+20 m (300 kgf
•
+17.4
cm, 260 in-Ibs.)
1.96 N
• m (20 kgf
• cm, 17.4 in-Ibs.)
[NOTE] If above bolts are tightened more than the designated values, it may cause breakage. Without fail,
tighten the bolts and screws according to the above specified values.
9-1-5. Internal wiring
Wiring diagram of products with noise suppressor
Stator
Connector Tube
Switch
Brown
Tube
Plug
Armature
Connector
Noise suppressor
Blue
Stator
Pillar terminal
Fig. 14
--- 19 ---
Schematic diagram of products with noise suppressor
Switch Lever [71]
Switch (A) [99]
Handle (A) [73]
Support (E) [98]
Cord Armor [74]
Cord [69]
Vinyl Tube [80]
Vinyl Tube [91]
Noise Suppressor [96]
Handle Holder [48]
Fig. 15
--- 20 ---
Safety precautions in wiring work (See Fig. 15.)
Switch (A) [99] is flexibly supported by Support (E) [98] to protect it from damage from vibration which could lead to possible electrical shock. Ensure without fail that Support (E) [98] is properly mounted. Also, ensure that the leadwires are properly covered by Vinyl Tube [80], and that the leadwires of the Stator Ass'y [83] and the grounding leadwire are properly supported by Vinyl Tube [91].
9-1-6. Insulation tests
On completion of disassembly and repair, measure the insulation resistance and dielectric strength.
Insulation resistance: 7 M
Ω
or more with DC 500 V Megohm Tester
Dielectric strength: AC 4000 V/1 minute, with no abnormalities
• • •
220 V --- 240 V
(and 110 V for U.K. products)
AC 2500 V/1 minute, with no abnormalities
• • •
110 V --- 127 V
(except U.K. products)
9-1-7. No-load current value
After no-load operation for 30 minutes, the no-load current value should be as follows:
Voltage (V)
Current (A) (Max.)
110
5.9
115
5.7
120
5.4
127
5.2
220
3.0
230
2.8
240
2.7
--- 21 ---
10. STANDARD REPAIR TIME (UNIT) SCHEDULES
Variable
MODEL 20 40
Fixed
Work Flow
H 70SA
Switch (A)
Cord
Handle (A)
Handle (B)
Handle Pin
Handle Holder
General Assembly
60
Gear Cover
80
Armature Ass'y
100
Front Cover
Stop Lever
Ass'y
O-ring (C)
Second
Hammer
Mouth
Mouth Cover
Ur ethane Ring
Shank Sleeve
Damper (A)
O-ring (B)
O-ring (E)
Cylinder Case
Ball Bearing
(6201)
Ball Bearing
(6203)
Counter Gear
Ball Bearing
(6001)
Ball Bearing
(6201)
Striker
Piston
Connecting
Rod Ass'y
Needle Bearing
Oil Seal (A)
O-ring (A)
O-ring
(1AS-60)
Ball Bearing
(6302)
Final Gear
Crank Shaft
Ball Bearing
(6205)
Inner Cover
120 min.
Housing Ass'y
Stator Ass'y
--- 22 ---
LIST NO. E459
ELECTRIC TOOL PARTS LIST
HAMMER
Model H 70SA
2000
•
8
•
10
(E1)
--- 23 ---
PARTS
ITEM
NO.
CODE NO.
1 318-656
956-962
956-961
956-960
319-359
956-996
956-958
306-163
949-433
998-414
998-415
998-413
944-928
998-434
944-921
956-955
996-364
998-423
998-426
998-424
956-975
998-425
998-435
998-420
998-428
306-437
998-427
998-419
998-433
998-418
956-963
46
47
48
43
44
45
49
50
51
39
40
41
42
36
37
38
33
34
35
29
30
31
32
26
27
28
23
24
25
19
20
21
22
16
17
18
12
13
14
15
9
10
11
6
7
8
4
5
2
3
319-360
630-2VV
944-916
944-915
998-412
957-143
620-5DD
956-949
990-079
998-430
956-850
318-655
944-918
993-496
305-633
319-365
319-364
310-124
956-969
8 --- 00
DESCRIPTION
STOP LEVER ASS'Y
STOP LEVER
NEEDLE ROLLER
SPRING CASE
LEVER SPRING
DAMPER (B)
FRONT COVER
SECOND HAMMER
O-RING (C)
NYLOCK HEX. SOCKET HD. BOLT M8X30
O-RING (B)
O-RING (E)
DAMPER (A)
SHANK SLEEVE
MOUTH
MOUTH COVER
MOUTH WASHER
URETHANE RING
CYLINDER CASE
O-RING (1AS-60)
STRIKER
NYLOCK HEX. SOCKET HD. BOLT M8X35
BOLT WASHER M8 (10 PCS.)
O-RING (A)
OIL SEAL (A)
PISTON
PISTON PIN
CONNECTING ROD ASS'Y
NEEDLE BEARING (NTN 8E-NK 18/20 RDO)
CRANK WASHER
SEAL LOCK HEX. SOCKET HD. BOLT M8X16 3
NAME PLATE 1
1
1
1
1
1
GEAR COVER
BALL BEARING 6302VVCMPS2L
FINAL GEAR
DISTANCE RING (B)
INNER COVER
SEAL RING (A)
1
1
1
1
1
1
BALL BEARING 6205DDCMPS2L
BEARING COVER
SEAL LOCK HEX. SOCKET HD. BOLT M5X16 7
CRANK SHAFT 1
1
1
WOODRUFF KEY 4X16
DAMPER (B)
PIN D5X15.8
2
4
2
SEAL LOCK HEX. SOCKET HD. BOLT M6X30 8
SIDE HANDLE 1
HANDLE HOLDER 2
HANDLE DAMPER (B)
HANDLE DAMPER
HOLDER SEAL
2
4
1
4
1
1
1
4
1
1
1
1
1
1
1
1
1
1
6
1
1
1
1
NO.
USED
1 INCLUD.2-6
1
1
1
1
INCLUD.29
*
: ALTERNATIVE PARTS
--- 24 ---
REMARKS
H 70SA
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
PARTS
ITEM
NO.
CODE NO.
52 998-416
620-3DD
944-907
500-390Z
500-408Z
500-466Z
500-450Z
500-458Z
500-391Z
992-870
992-869
968-643
305-636
958-049
987-203
998-417
991-690
983-162
956-972
944-960
940-540
999-086
956-984
986-940
620-1VV
956-948
600-1VV
944-911
940-778
960-266
981-987Z
982-095
980-063
959-141
959-140
88
88
88
85
86
87
89
90
91
83
83
83
84
80
81
82
77
78
79
74
75
75
76
72
73
74
69
70
71
69
69
69
69
67
68
69
63
64
65
66
60
61
62
57
58
59
53
54
55
56
960-251
956-764
340-488C
340-488E
340-488F
945-932
944-954
620-1DD
996-370
360-286C
360-286E
360-286F
306-098
986-277
319-363
HOLDER
DESCRIPTION
NO.
USED
1
SEAL LOCK SCREW (W/SP. WASHER) M4X12 4
COVER PLATE 1
SEAL LOCK HEX. SOCKET HD. BOLT M5X12 6
SEAL LOCK HEX. SOCKET HD. BOLT M4X12 4
CAP COVER
CAP RUBBER
BRUSH CAP
CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 2
BRUSH HOLDER 2
SEAL LOCK HEX. SOCKET HD. BOLT M6X45 6
2
2
2
BALL BEARING 6201VVCMPS2L
COUNTER GEAR
BALL BEARING 6001VVCMPS2L
BEARING COVER (A)
BALL BEARING 6203DDCMPS2L
DISTANCE RING (A)
CORD
CORD
CORD
CORD
CORD
CORD
PIN
SWITCH LEVER
1
1
1
1
1
1
1
1
1
1
1
1
1
1
REMARKS
(CORD ARMOR D10.7)
(CORD ARMOR D8.2) FOR AUS,NZL
(CORD ARMOR D10.7) FOR GBR (110V)
(CORD ARMOR D10.7) FOR GBR (230V)
(CORD ARMOR D10.7) FOR SAF
(CORD ARMOR D10.7) FOR SUI
RETAINING RING (E-TYPE) FOR D4 SHAFT
HANDLE (A)
CORD ARMOR D8.2
CORD ARMOR D10.7
CORD CLIP
CORD CLIP
TAPPING SCREW (W/WASHER) D4X20
TERMINAL
CONNECTOR 50092 (10 PCS.)
CONNECTOR 50091 (10 PCS.)
VINYL TUBE (I.D7XT0.5X50)
HEX. HD. TAPPING SCREW D5X65
SPECIAL WASHER
STATOR ASS'Y 110V
STATOR ASS'Y 230V
STATOR ASS'Y 240V
BRUSH TERMINAL
BEARING WASHER
BALL BEARING 6201DDCMPS2L
FAN
ARMATURE ASS'Y 110V-115V
ARMATURE ASS'Y 220V-230V
ARMATURE ASS'Y 240V
FAN GUIDE
INTERNAL WIRE
VINYL TUBE
1
1
1
1
1
1
2
1
2
1
2
2
2
1
1
1
2
1
1
1
1
1
1
1
1
1
FOR SUI
FOR CORD
EXCEPT FOR FIN
EXCEPT FOR FIN
INCLUD.84
INCLUD.84
INCLUD.84
INCLUD.87
INCLUD.87
INCLUD.87
*
: ALTERNATIVE PARTS
--- 25 ---
H 70SA
8 --- 00
101
102
103
104
105
106
107
*
*
*
* 97
98
99
* 100
95
96
97
PARTS
ITEM
NO.
CODE NO.
92 319-366
93
94
930-153
958-308Z
938-307
994-273
981-974
306-681
990-082
992-891
949-423
319-367
305-631
301-653
319-361
938-477
319-362
306-099
DESCRIPTION
HANDLE PIN
SUPPORT (B)
PILLAR TERMINAL (A)
PILLAR TERMINAL
NOISE SUPPRESSOR
INTERNAL WIRE
INTERNAL WIRE
SUPPORT (E)
SWITCH (A) (1P SCREW TYPE) W/O LOCK
WASHER M4 (10 PCS.)
WASHER
HANDLE (B)
TAPPING SCREW (W/FLANGE) D4X20 (BLACK)
2
2
1
1
1
1
1
1
1
1
NO.
USED
2
1
1 FOR FIN
EXCEPT FOR NZL.SAF
FOR GBR
REMARKS
EXCEPT FOR NZL
HOUSING ASS'Y
HEX. SOCKET SET SCREW M5X8
MESH
TAIL COVER
1
1
1
2
INCLUD.61,105
STANDARD ACCESSORIES
ITEM
NO.
CODE NO.
DESCRIPTION
501 944-961 BULL POINT 410MM
502
503
943-277
872-422
HEX. BAR WRENCH 3MM
HEX. BAR WRENCH 6MM
NO.
USED
1
1
1
REMARKS
H 70SA
OPTIONAL ACCESSORIES
ITEM
NO.
601
602
603
604
605
606
607
608
609
610
CODE NO.
944-962
944-964
944-966
944-965
319-298
306-441
981-840
308-471
930-035
980-927
DESCRIPTION
COLD CHISEL 410MM (HEX. SHANK TYPE)
CUTTER W75X45L (ROUND SHANK TYPE)
RAMMER SHANK (HAMMER)
RAMMER 200MM
SCOOP 380L (ROUND SHANK TYPE)
SERVICE KIT (H 65SB)
GREASE (A) FOR HAMMER.HAMMER DRILL (30G)
1
GREASE FOR HAMMER.HAMMER DRILL (70G)
1
GREASE (SEP-3A) (100G) 1
GREASE FOR HAMMER.HAMMER DRILL (500G) 1
1
1
1
1
NO.
USED
1
1
REMARKS
INCLUD.9,11,12,18,20,24,25,38,607,609
Printed in Japan
(000810 N)
8 --- 00
*
: ALTERNATIVE PARTS
--- 26 ---
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