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

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MODEL
H 70SA
POWER TOOLS
TECHNICAL DATA
HAMMER
H
AND
H 70SA
SERVICE MANUAL
LIST No. E459
Aug. 2000
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi H 70SA

  • Page 1 MODEL H 70SA POWER TOOLS TECHNICAL DATA HAMMER H 70SA SERVICE MANUAL LIST No. E459 Aug. 2000 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...

  • Page 2: Table Of Contents

    8-4. Movement of the Stop Lever ......................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 ..............22 Assembly Diagram for H 70SA ......................23...

  • Page 3: Product Name

    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.

  • 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: Specifications

    MAKITA HM 1800 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.

  • Page 6: Optional Accessories

    5-1. Optional Accessories 1. Grooving and chiseling work (1) Cold chisel Overall length Code No. 410 mm (16-1/8") 944962 2. Cutting and stripping work (asphalt cutting, etc.) (1) Cutter Width Overall length Code No. 75 mm (2-15/16") 410 mm (16-1/8") 944964 3.
  • Page 7 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. --- 5 ---...

  • Page 8: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons HITACHI Maker Model name H 70SA H 65SB Power input 1,240* 1,240* 1,240 Full-load impact rate 1,400 1,400 1,200 (24-5/8") (28-19/32") (24-1/8") Dimensions (illustration (20-15/32") --- ( (4-23/32") (21-13/16") below) (8-7/8") (9-5/16") (9-1/4")

  • Page 9: Demolition Performance Comparisons

    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.

  • Page 10: 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 11: 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 12 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. 4 --- 10 ---...
  • Page 13 125.0 124.0 123.0 122.0 HITACHI H70SA 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 14: Stop Lever [Tool Retainer]

    8-3. Stop Lever [Tool Retainer] To attach and detach the tool (bull point, etc.), Hold the tool with its as shown in Fig. 5, pull the stop lever in the flattened part directed direction of arrow, and turn it 180˚. Then, fully upward.

  • Page 15: 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 16 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.
  • Page 17 Disassembly of the Stop Lever [2] Lever Spring [5] Stop Lever [2] Damper (B) [6] Needle Roller [3] Spring Case [4] 3 mm dia. hole Push Damper (B) [6] with two flat-blade screwdrivers. Overlap the end surface of the Steel rod Stop Lever [2] on the flange (3 mm or less dia.) portion of the Front Cover [7].
  • Page 18 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.
  • Page 19 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.
  • Page 20 (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.
  • Page 21 9-1-4. Tightening torque (1) M4 hexagon socket hd. bolts 4.41 m (45 cm, 39.1 in-Ibs.) 0.49 • • +12.4 (2) M5 hexagon socket hd. bolts 7.84 +1.96 m (80 cm, 69.5 in-Ibs.) • • +17.4 +1.96 (3) M6 hexagon socket hd. bolts 9.80 m (100 cm, 86.9...
  • Page 22 Schematic diagram of products with noise suppressor Switch Lever [71] Handle (A) [73] Switch (A) [99] Support (E) [98] Cord [69] Cord Armor [74] Vinyl Tube [80] Noise Suppressor [96] Vinyl Tube [91] Handle Holder [48] Fig. 15 --- 20 ---...
  • Page 23 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].

  • Page 24: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 120 min. MODEL Fixed Work Flow H 70SA Handle (A) Housing Ass'y Switch (A) Handle (B) Stator Ass'y Handle Pin Cord Handle Holder General Assembly Armature Ass'y Gear Cover Ball Bearing Mouth Front Cover...

  • Page 25: Assembly Diagram For H 70Sa

    LIST NO. E459 ELECTRIC TOOL PARTS LIST 2000 HAMMER • • ( E1 ) Model H 70SA --- 23 ---...
  • Page 26 H 70SA PARTS ITEM CODE NO. DESCRIPTION REMARKS USED 318-656 STOP LEVER ASS'Y INCLUD.2-6 998-423 STOP LEVER 998-426 NEEDLE ROLLER 998-424 SPRING CASE 956-975 LEVER SPRING 998-425 DAMPER (B) 998-435 FRONT COVER 998-420 SECOND HAMMER 998-428 O-RING (C) 306-437 NYLOCK HEX. SOCKET HD. BOLT M8X30...
  • Page 27 H 70SA PARTS ITEM CODE NO. DESCRIPTION REMARKS USED 998-416 HOLDER 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...

  • Page 28: Standard Accessories

    H 70SA PARTS ITEM CODE NO. DESCRIPTION REMARKS USED 319-366 HANDLE PIN 930-153 SUPPORT (B) 958-308Z PILLAR TERMINAL (A) FOR FIN 938-307 PILLAR TERMINAL EXCEPT FOR NZL.SAF 994-273 NOISE SUPPRESSOR 981-974 INTERNAL WIRE 306-681 INTERNAL WIRE FOR GBR 990-082 SUPPORT (E)

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