Hitachi H 70SD Technical Data And Service Manual
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Hitachi H 70SD Technical Data And Service Manual

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MODEL
H 70SD
POWER TOOLS
TECHNICAL DATA
HAMMER
H
AND
H 70SD
SERVICE MANUAL
LIST No. E461
Dec. 2001
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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  • Page 1 MODEL H 70SD POWER TOOLS TECHNICAL DATA HAMMER H 70SD SERVICE MANUAL LIST No. E461 Dec. 2001 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...

  • Page 2: Table Of Contents

    8-2. Vibration-Absorbing Construction ....................10 8-3. Tool Retainer ..........................13 9. REPAIR GUIDE ..........................14 9-1. Precautions and Suggestions for Disassembly and Reassembly of the Main Body ....14 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............23 Assembly Diagram for H 70SD...

  • Page 3: Product Name

    2. MARKETING OBJECTIVE The Model H 70SD has been developed based on the current Model H 65SD, which features the use of 28.5 mm (1-1/8") air tool shank tools, standard hexagonal shank tools (combo type), and retaining groove tools without collar.

  • Page 4: Selling Point Descriptions

    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.
  • Page 5 Model H 65SD which features the use of 3 types of 28.5 mm (1-1/8") hex. shank tools. 4-1-5. Tool retainer accepts 3 types of 28.5 mm (1-1/8") hex. shank tools Three types of shank tools (Fig. 2) can be used in the Model H 70SD by turning the tool retainer in the following two methods.

  • Page 6: Specifications

    5. SPECIFICATIONS Item H 70SD Power source Single-phase AC 50/60 Hz Voltage (V) 110, 230, 240 Motor type AC single-phase series commutator motor Insulation structure Double insulation Aluminum alloy die casting, cast aluminum alloy, Enclosure Material glass-fiber reinforced plastic resin...

  • Page 7: Optional Accessories

    5-1. Optional Accessories 1. Demolition work (1) Bull point Overall length Code No. 410 mm (16-9/64") 996372 2. Grooving and chiseling work (1) Cold shisel Overall length Code No. 410 mm (16-9/64") 996373 520 mm (20-15/32") 985231 3. Cutting and stripping work (asphalt cutting, etc.) (1) Cutter Overall length Code No.
  • Page 8 5. Grease for impact drill 30 g (1 oz) Tube 70 g (2.5 oz) Tube 500 g (1.1 lbs.) Can Code No. 981840 Code No. 980927 Code No. 308471 (Note) Code numbers listed above are subject to change. Please refer to periodic Technical News Bulletins. --- 6 ---...

  • Page 9: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons HITACHI Maker H 70SD H 70SA Model name H 65SD 1,240* 1,240* 1,240* 1,240 Power input Full-load impact rate 1,400 1,400 1,400 1,200 (28-7/16") (24-5/8") (32-13/32") (24-1/8") Dimensions (illustration (4-23/32") --- ( (20-15/32")

  • Page 10: Demolition Performance Comparisons

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model H 70SD 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.

  • Page 11: Grease Replacement

    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.

  • Page 12: Reference Information

    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.
  • Page 13 Handle damper Housing Switch lever 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. 7 --- 11 ---...
  • Page 14 125.0 124.0 123.0 122.0 HITACHI H70SD 121.0 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.).

  • Page 15: Tool Retainer

    8-3. Tool Retainer Three types of shank tools (Fig. 2) can be mounted to the Model H 70SD by turning the saddle-shaped Retainer Front cover retainer. (1) Mounting air tool shank tool and standard hex. shank tool Raise the retainer in A direction and insert the tool shank into the hexagonal hole of the front cover as far as it will go (Fig.

  • Page 16: Repair Guide

    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).
  • Page 17 Press the end surface of the Crank Shaft by fitting a steel rod with a hand press. Ball Bearing 6302VVCMPS2L [33] Final Gear [34] Inner Cover [36] Crank Shaft [41] Tubular jig Fig. 13 Disassembly of remaining parts from the Inner Cover [36] Loosen the three Seal Lock Hex.
  • Page 18 Disassembly of the Retainer [1] section Remove the two Roll Pins D6 x 55 [2] from the 6 mm dia. holes of the Retainer [1] and remove the Lever Pin [3]. The Retainer [1] and two Retainer Dampers [5] can then be removed from the Front Cover [6] (Fig. 15). Roll Pins D6 x 55 [2] (2 pcs.) Retainer [1] Retainer Dampers [5]...
  • Page 19 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 [41] section Press-fit the Ball Bearing 6205DDCMPS2L [38] into the Inner Cover [36], and fasten the Bearing Cover [39] onto the Inner Cover [36] with the four Seal Lock Hex.
  • Page 20 Reassembly of the Handle Holder [47] section Mount four Dampers (B) [43] and four Handle Dampers [49] to the Housing Ass'y [103], then mount two Handle Dampers (B) [48] to the Housing Ass'y [103] in the direction of arrow marked on Handle Damper (B) [48] surface.
  • Page 21 Mounting of Oil Seal (A) [24] When mounting Oil Seal (A) [24] on the Piston [25], ensure Oil Seal (A) [24] that the lip portion of the Oil Seal is directed toward the rear O-Ring (A) [23] surface of the Piston [25], as illustrated in Fig. 18. Prior to Piston [25] reassembly, thoroughly coat Oil Seal (A) [24] and O-Ring (A) [23] with grease (Grease for Impact Drill, Part No.
  • Page 22 (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.
  • Page 23 Schematic diagram of products with noise suppressor Handle (A) [72] Switch Lever [70] Switch (A) Support (E) [97] (1P Screw Type) W/O Lock [98] Cord [68] Cord Armor [73] Vinyl Tube (A) (I.D.7xT0.5x50) [80] Noise Suppressor [95] Vinyl Tube [91] Handle Holder [47] Fig.
  • Page 24 Safety precautions in wiring work (See Fig. 21.) Switch (A) (1P Screw Type) W/O Lock [98] is flexibly supported by Support (E) [97] to protect it from damage from vibration which could lead to possible electrical shock. Ensure without fail that Support (E) [97] is properly mounted.

  • Page 25: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 120 min. MODEL Fixed Work Flow H 70SD Handle (A) Switch (A) Handle (B) Housing Ass'y Handle Pin Cord Stator Ass'y Handle Holder General Assembly Armature Ass'y Gear Cover Ball Bearing Mouth Front Cover...
  • Page 26 LIST NO. E461 ELECTRIC TOOL PARTS LIST HAMMER 2001 • • Model H 70SD (E1) 100 101...
  • Page 27 PARTS H 70SD ITEM CODE NO. DESCRIPTION REMARKS USED 318-221 RETAINER 994-416 ROLL PIN D6X55 318-222 LEVER PIN 306-437 NYLOCK HEX. SOCKET HD. BOLT M8X30 305-621 RETAINER DAMPER 318-223 FRONT COVER 996-369 DAMPER (B) 996-367 SECOND HAMMER 998-428 O-RING (C)
  • Page 28 PARTS H 70SD ITEM CODE NO. DESCRIPTION REMARKS USED 987-203 SEAL LOCK SCREW (W/SP. WASHER) M4X12 998-417 COVER PLATE 991-690 SEAL LOCK HEX. SOCKET HD. BOLT M5X12 983-162 SEAL LOCK HEX. SOCKET HD. BOLT M4X12 956-972 CAP COVER 944-960 CAP RUBBER...

  • Page 29: Standard Accessories

    PARTS H 70SD ITEM CODE NO. DESCRIPTION REMARKS USED 938-307 PILLAR TERMINAL EXCEPT FOR SAF 317-491 NOISE SUPPRESSOR 981-974 INTERNAL WIRE 306-681 INTERNAL WIRE FOR GBR 990-082 SUPPORT (E) 992-891 SWITCH (A) (1P SCREW TYPE) W/O LOCK 949-423 WASHER M4 (10 PCS.)

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