Hitachi DH 24DV Technical Data And Service Manual
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Hitachi DH 24DV Technical Data And Service Manual

Cordless rotary hammer
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MODEL
DH 24DV
Hitachi
Power Tools
D
TECHNICAL DATA
CORDLESS ROTARY HAMMER
AND
DH 24DV
SERVICE MANUAL
LIST No. G811
Jun. 2004
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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  • Page 1 MODEL DH 24DV Hitachi Power Tools TECHNICAL DATA CORDLESS ROTARY HAMMER DH 24DV SERVICE MANUAL LIST No. G811 Jun. 2004 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 REMARK: 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 GBH24V BOSCH DW004K DEWALT BHR200...

  • Page 3: Table Of Contents

    9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ............. 25 9-1. Disassembly ............................. 25 9-2. Reassembly ............................28 9-3. Precautions on Disassembly and Reassembly of the Charger ............30 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ................ 31 Assembly Diagram for DH 24DV...

  • Page 4: Product Name

    2. MARKETING OBJECTIVE The Model DH 24DV is an upgraded version of the current Model DH 20DV. It features the fastest drilling speed in the 24-V class thanks to the higher power motor and the more efficient transmission of the hammering force.

  • Page 5: Selling Points

    4. SELLING POINTS Fastest drilling speed in the 24-V class Equivalent to Q 1.4 times faster than B, P, C and the Model DH 20DV Replaceable carbon brushes Cylindrical gear cover The carbon brushes can be replaced by loosening Increased in sturdiness and reliability the two screws and removing the grip cover.

  • Page 6: Selling Point Descriptions

    4-1-1. Fastest drilling speed in the 24-V class The drilling speed of the Model DH 24DV is equivalent to Q and 1.4 times higher than the Model DH 20DV, B, P and C thanks to the efficient transmission of the hammering energy. For detail, refer to "6-2. Drilling Speed Comparisons"...
  • Page 7 4-1-6. Comfortably shaped handle The handle is shaped so that it is easy to push the main body straight in either upward or horizontal direction. The double-layer molded grip cover consists of a resin base covered with a soft resin to ensure a soft-touch and non-slip grip of the handle.

  • Page 8: Specifications

    5. SPECIFICATIONS 5-1. Specifications Concrete Capacity 24 mm (15/16") Steel 13 mm (1/2") Wood 30 mm (1-3/16") Usable drill bits SDS-plus type only "POWER" mode: 1,000/min., "SAVE" mode: 500/min. No-load rotation speed Full-load blow "POWER" mode: 4,500/min., "SAVE" mode: 2,200/min. Type of motor DC magnet motor Body...
  • Page 9 Pilot lamp indications (UC 24YFB) 0.5 sec. ON, 0.5 sec. OFF Prior to charging Blinks Stays ON constantly During charging Red pilot lamp remains lit or flashes. 0.5 sec. ON, 0.5 sec. OFF Blinks Charging completed 0.1 sec. ON, 0.1 sec. OFF Storage battery or Charging not Flickers...

  • Page 10: Optional Accessories

    5-2. Optional Accessories A. Drilling anchor holes (rotation + striking) Drill bit (slender shaft) (2) Adapter for slender shaft (1) Drill bit (slender shaft) (SDS-plus shank) Drill bit (slender shaft) Adapter for slender shaft Outer dia. (mm) Overall length (mm) Code No.
  • Page 11 B. Anchor setting Anchor setting bar to permit anchor setting operation with the hammer drill Anchor setting bar Anchor setting adapter (SDS-plus shank) Part name Overall length Part name Code No. Overall length Code No. W-1/4 Anchor setting adapter-A 302976 W-1/4 Anchor setting adapter-B 302979 W-5/16 Anchor setting adapter-A...
  • Page 12 D. Drilling holes and driving screws (rotation only) Drill chuck, chuck adapter (G), special screw and chuck wrench 13 mm (1/2") Drill chuck Chuck adapter (G) Special screw (13VLRB-D) (SDS-plus shank) Chuck wrench (Note) If the tool is to be used for loosening screws, open the three jaws of the drill chuck and securely fix the drill chuck to chuck adapter (G) with the special screw (a left-hand threaded M6 screw) when mounting the drill chuck onto chuck adapter (G).
  • Page 13 E. Driling hole (rotation only) For drilling holes in steel and wood • • • Chuck adapter (D) Drill chuck (13VLD-D) (SDS-plus shank) Chuck wrench (NOTE) The 13VLD-D drill chuck and chuck adapter (D) cannot be used for reverse rotation. If reverse rotation is to be used for loosening screws, use the cross-recessed head (Phillips) bit (bit No.
  • Page 14 H. Dust cup, dust collector (B) Dust cup Dust collector (B) ass'y Code No. 971787 Code No. 306885 --- 11 ---...

  • Page 15: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons Maker HITACHI DH 24DV DH 20DV Model 24 (15/16") 20 (25/32") 20 (25/32") 20 (25/32") 20 (25/32") 20 (25/32") Concrete 13 (1/2") 13 (1/2") 10 (3/8") 13 (1/2") 13 (1/2") 13 (1/2")

  • Page 16: Drilling Speed Comparisons

    Drilling speed depends on the operating conditions. The test results shown in Fig. 3 is based on actual factory tests, and is used as a reference only. Figure 3 shows the drilling speed comparisons for downward drilling. The drill bits used are the Hitachi genuine SDS-plus shank bits. 1000...

  • Page 17: Per Charge Working Capacity Comparisons

    Maker Hole dia. x Depth Model 0 20 80 100 120 140 160 180 200 220 240 260 280 300 HITACHI DH 24DV 4.8 mm dia. x 25L HITACHI DH 20DV HITACHI DH 24DV 6.5 mm dia. x 30L DH 20DV...

  • Page 18: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model DH 24DV Cordless Rotary 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 and Name Plate attached to each tool.
  • Page 19 Ensure that all customers understand that the Models EB 2420 and EB 2430H batteries should be turned in to a Hitachi Power Tool sales outlet or authorized service center when they are no longer capable of being recharged or repaired. If thrown into a fire, the batteries may explode, or, if discarded indiscriminately, leakage of the cadmium compound contained in the battery may cause environmental pollution.

  • Page 20: Caution Plates

    (3) The following cautions are listed on the Name Plate attached to each Model UC 24YFB charger. For the U. S. A. and Canada CAUTION For safe operation, see instruction manual. Charge HITACHI rechargeable battery type EB 2420. Other types of batteries may burst causing personal injury and damage. Charge between 32ûF and 104ûF.

  • Page 21: Precautions Requiring Particular Attention During Sales Promotion

    (1) Appropriate drilling capacity of the Model DH 24DV The Model DH 24DV is not capable of drilling several dozens of holes like a conventional AC type impact or hammer drill because it is a cordless hammer drill powered by a battery. If the customer wishes to use the tool to drill many holes in succession, please recommend that a spare battery should be kept available for use.

  • Page 22: Reference Material

    Model DH 24DV more compact for easier handling and operability. Thus, the appearance of the Model DH 24DV is similar to that of an impact drill. The rotation of the armature is transmitted to the second shaft via the first gear, and causes it to rotate. The second shaft engages the second gear mounted on the outer circumference of the cylinder.
  • Page 23 Idle striking prevention mechanism The idle striking prevention mechanism in the Model DH 24DV is different from that of conventional hammer drills. When the drill bit is lifted from the concrete surface on completion of drilling, the second hammer moves to the position indicated by the continuous lines in Fig.
  • Page 24 Fig. 6 Slip mechanism The slip mechanism in the Model DH 24DV consists of a coil spring which applies a pre-set amount of pressure to ensure the interlocking of three claws provided on the flange of the cylinder (the final rotating shaft) and three matching claws provided on the face of the second gear, by which rotation is transmitted to the cylinder.

  • Page 25: Rotation Only" And "Rotation + Striking" Changeover Mechanism

    8-3. "Rotation Only" and "Rotation + Striking" Changeover Mechanism The change lever on the Model DH 24DV permits quick and easy changeover between the "rotation only" and "rotation + striking" functions. Armature rotation is transmitted to the second shaft and the first gear, and then to the clutch via the spline on the second shaft spline.

  • Page 26: Tool Retainer Section

    The service life of a drill bit with a diameter of 8 mm is approximately 300 holes when drilling into concrete with a depth of 30 mm. If reground before the end of its service life, the drill bit will continue to provide efficient drilling. Figure 8 shows the regrinding angle.

  • Page 27: Dust Collector (B)

    8-7. Dust Collector (B) When drilling holes overhead, dust collector (B) can be mounted on the Model DH 24DV to prevent dust and chips from falling downward. Dust collector (B) is intended solely for use when drilling holes in concrete, and cannot be used for drilling holes in steel or wood.

  • Page 28: Precautions In Disassembly And Reassembly

    9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY The numbers in [Bold] correspond to the item numbers in the Parts List and exploded assembly diagrams. 9-1. Disassembly (1) Disassembly of the striking mechanism section Push in the Second Hammer [26] with a drill bit or a screwdriver. Remove the Striker [34] chucked by O-ring (C) [31].
  • Page 29 (2) Disassembly of the tool retainer Slide the Grip [3] fully in the arrow direction as shown in Fig. 12 and remove the Front Cap [1]. Pulling the Grip [3] as shown in Fig. 13, remove the Stopper Ring [2] with a retaining ring puller. Then the Grip [3], Ball Holder [4], Steel Ball D7.0 [20], Holder Plate [5], Holder Spring [6] and Washer (B) [7] can be removed from the Cylinder [21].
  • Page 30 Tap with a hammer. Punch 5-mm diameter hole (2 pcs.) O-ring (1AP-20) [27] Damper Holder [32] Hammer Holder [28] O-ring (C) [31] Second Hammer [26] O-ring (B) [29] Stopper Ring [33] Damper (A) [30] Fig. 14 (5) Disassembly of the armature and the housing After disassembly of the striking mechanism section, remove the Machine Screw M4 x 8 [77] from the Grip Cover [76] and remove the Grip Cover [76] to show the carbon brushes.

  • Page 31: Reassembly

    Apply Molub Alloy No. 777-1 grease to the outer circumference of the Clutch [44] groove and the pin portion of the Change Lever [19]. Apply HITACHI Motor Grease No. 29 to the O-ring (S-18) [18] for the Steel Ball D7.0 [20] and the Change Lever [19].
  • Page 32 Inner Cover Ass'y [39] Striker [34] Piston [36] Second Shaft [41] 2-mm diameter hole (2 pcs.) Reciprocating Bearing [46] First Gear [48] Fig. 17 (6) Perform wiring as shown in Fig. 18. Upper side + brown Lower side blue Fig. 18 Wiring arrangement and port locations Viewed from "A"...

  • Page 33: Precautions On Disassembly And Reassembly Of The Charger

    9-3. Precautions on Disassembly and Reassembly of the Charger Please refer to Technical Data and Service Manual for Model UC 24YFB for precautions on disassembly and resassembly. --- 30 ---...

  • Page 34: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed DH 24DV Work Flow Grip Cover Armature Housing (A).(B) Set O-ring (P-22) Ball Bearing (608DD) Magnet Ball Bearing (608DD) Brush Holder Terminal Support DC-Speed Control Switch General Assembly Front Cap...
  • Page 35 Hitachi Power Tools LIST NO. G811 ELECTRIC TOOL PARTS LIST CORDLESS ROTARY HAMMER 2004 • • Model DH 24DV (E1)
  • Page 36 PARTS DH 24DV ITEM CODE NO. DESCRIPTION REMARKS USED 306-345 FRONT CAP 306-340 STOPPER RING 323-154 GRIP 322-810 BALL HOLDER 322-811 HOLDER PLATE 322-812 HOLDER SPRING 984-118 WASHER (B) 939-547 RETAINING RING FOR D20 SHAFT (10 PCS.) 305-558 TAPPING SCREW (W/FLANGE) D5X25 (BLACK)
  • Page 37 PARTS DH 24DV ITEM CODE NO. REMARKS DESCRIPTION USED 305-812 TAPPING SCREW (W/FLANGE) D4X16 (BLACK) 876-796 O-RING (P-22) 608-DDM BALL BEARING 608DDC2PS2L 360-663 ARMATURE AND PINION ASS’Y DC 24V INCLUD. 50, 54, 57, 58 323-156 MAGNET 982-631 WASHER (A) 608-DDM...

  • Page 38: Standard Accessories

    STANDARD ACCESSORIES DH 24DV ITEM CODE NO. DESCRIPTION REMARKS USED 323-155 SIDE HANDLE 303-709 DEPTH GAUGE 310-331 DEPTH GAUGE 1 FOR USA, CAN CHARGER (MODEL UC 24YFB) 323-350 CASE Printed in Japan --- 4 --- * ALTERNATIVE PARTS 6 -- 04...

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