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

Hitachi DH 24DVA Technical Data And Service Manual

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MODEL
DH 24DVA
Hitachi
Power Tools
D
CORDLESS ROTARY HAMMER
TECHNICAL DATA
AND
DH 24DVA
SERVICE MANUAL
LIST No. G842
Mar. 2006
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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  • Page 1 MODEL DH 24DVA Hitachi Power Tools CORDLESS ROTARY HAMMER TECHNICAL DATA DH 24DVA SERVICE MANUAL LIST No. G842 Mar. 2006 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 DW005K DEWALT BHR200 MAKITA...

  • Page 3: Table Of Contents

    9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ............29 9-1. Disassembly ........................... 29 9-2. Reassembly ............................ 32 9-3. Precautions on Disassembly and Reassembly of the Charger ............35 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............36 Assembly Diagram for DH 24DVA...

  • Page 4: Product Name

    Model DH 24PC3 and the power supply unit including the motor is common with the Model DH 24DV. Our rotary hammer lineup is reinforced with the new Model DH 24DVA aiming for increase of our market share.

  • Page 5: Selling Points

    4-1-2. Fastest drilling speed in the 24-V class The drilling speed of the Model DH 24DVA is equivalent to the Model DH 24DV and 1.4 times higher than C and 1.1 times higher than P thanks to the efficient transmission of the hammering energy. For detail, refer to "6-2.
  • Page 6 4-1-3. Greatest demolishing performance in the 24-V class The demolishing performance of the Model DH 24DVA is 1.4 times higher than C and 1.1 times higher than P thanks to the efficient transmission of the hammering energy. 4-1-4. Internal pressure adjustment mechanism By minimizing variations in the internal pressure during operation, hammering operation is stabilized.

  • Page 7: 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: 1,050/min., "SAVE" mode: 520/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 8 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 9: 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 10 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 Code No. Part name 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 11 E. Groove digging and edging (hammering only) Cold chisel Cutter (SDS-plus chank) (SDS-plus shank) Code No. 316657 Code No. 316658 F. Grooving (hammering only) Grooving chisel (SDS-plus shank) Code No. 316659 G. 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...
  • Page 12 (2) Slotted-head (minus) bit (1) Cross-recessed head (Phillips) bit [Overall length: 65 mm] [Overall length: 50 mm] (For use with slotted-head (minus) screw) (For use with cross-recessed head (Phillips) screw) Tip thickness Stamped bit No. Bit No. Code No. Applicable screw dia. (mm) Bit tip thickness Code No.
  • Page 13 J. Grease for electric impact drill Containing 500 g (1.1 lbs.): Code No. 980927 Containing 30 g (0.07 lbs.): Code No. 981840 70 g (0.15 lbs.): Code No. 308471 K. Dust cup, dust collector (B) Dust cup Dust collector (B) ass'y Code No.

  • Page 14: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons Maker HITACHI DH 24DVA DH 24DV Model 24 (15/16") 24 (15/16") 20 (25/32") 20 (25/32") Concrete 13 (1/2") 13 (1/2") 13 (1/2") 13 (1/2") Capacity Steel 30 (1-3/16") 30 (1-3/16") 30 (1-3/16") 27 (1-1/16")

  • Page 15: Drilling Speed Comparisons

    Drilling speed depends on the operating conditions. The test results shown in Fig. 1 is based on actual factory tests, and is used as a reference only. Figure 1 shows the drilling speed comparisons for downward drilling. The drill bits used are the Hitachi genuine SDS-plus shank bits. HITACHI DH 24DVA HITACHI DH 24DV 16.5...

  • Page 16: Chiseling Performance Comparison

    6-3. Chiseling Performance Comparison Chiseling performance varies considerably depending on the work conditions. Use the factory test results shown in Fig. 2 for comparison purposes only. Chiseling amount (kg/5 minutes) Maker Model HITACHI DH 24DVA Fig. 2 Chiseling performance comparison --- 13 ---...

  • Page 17: Per Charge Working Capacity Comparisons

    Number of holes drilled (holes/1 charge) Maker Model Hole dia. x Depth 100 120 140 160 180 220 240 260 280 HITACHI DH 24DVA 6.5 mm dia. x 30L HITACHI DH 24DV HITACHI DH 24DVA 8.5 mm dia. x 30L DH 24DV...

  • 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 24DVA 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, EB 2430H and EB 2433X 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 24DVA The Model DH 24DVA 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 24DVA more compact for easier handling and operability. Thus, the appearance of the Model DH 24DVA 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 24DVA 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 24DVA 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 Internal pressure adjustment mechanism An air passage is provided as shown in Fig. 7 to let out air inside the gear cover and let outside air in the gear cover. This passage is sandwiched between felt packings to pass only air (pressure). Thus variations in the internal pressure are minimized for stable hammering operation and prevention of idling and grease leakage.

  • Page 26: Three-Mode" Changeover Mechanism

    8-3. "Three-Mode" Changeover Mechanism The change lever of the Model DH 24DVA permits quick and easy changeover among the "rotation and hammering", "rotation only" and "hammering only" functions. Each function mode is explained below. (1) Rotation and hammering (Fig. 8) Adjust the change lever to "rotation and hammering"...
  • Page 27 (2) Rotation only (Fig. 9) Adjust the change lever to "rotation only" ( mark). The lock plate is moved forward by the pin of the change lever, and the clutch is moved forward at the back end of the lock plate. Engagement between the clutch and the claws of the reciprocating bearing is released ( A portion in the figure).

  • Page 28: Rotation Only" (No Hammering)

    8-4. "Rotation Only" (No Hammering) The Model DH 24DVA is equipped with a change lever for changeover between "rotation + hammering", "rotation only" and "hammering only" functions, merely mounting the chuck adapter will not stop the hammering action; it is absolutely necessary to turn the change lever to the "rotation only"...

  • Page 29: Drill Bits

    8-5. Drill Bits The chuck section is designed exclusively for the popular and widely available SDS-plus shank bits, as shown in Fig. 12. Rotating torque is transmitted to the drill bit by two key rails provided in the tool holding section. A steel ball is used to prevent the bit from falling out.

  • Page 30: Tool Retainer Section

    8-6. Tool Retainer Section Figure 14 shows the construction of the chuck section. Holder spring Steel ball Washer (B) Ball holder Grip Front cap Forward Backward Cylinder Key rails Stopper ring (two pieces) Holder plate Fig. 14 The tool retainer is structured as shown in Fig. 14. The tip of the tool retainer is covered with the front cap (made of rubber) to prevent dust and chips from getting inside.

  • Page 31: Dust Collector (B)

    8-7. Dust Collector (B) When drilling holes overhead, dust collector (B) can be mounted on the Model DH 24DVA 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 32: 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 hammering mechanism section Push in the Second Hammer [29] with a drill bit or a screwdriver. Remove the Striker [37] chucked by O-ring (C) [34].
  • Page 33 (3) Disassembly of the tool retainer Slide the Grip [3] fully in the arrow direction as shown in Fig. 17 and remove the Front Cap [1]. Pulling the Grip [3] as shown in Fig. 18, remove the Stopper Ring [2] with a retaining ring puller. Then the Grip [3], Ball Holder [4], Steel Ball D7.0 [16], Holder Plate [5], Holder Spring [6] and Washer (B) [7] can be removed from the Cylinder [17].
  • Page 34 Tap with a hammer. Punch (C) (J-341) 5-mm diameter hole (2 pcs.) O-ring (1AP-20) [30] Damper Holder [35] Hammer Holder [31] O-ring (C) [34] Second Hammer [29] Vise O-ring (B) [32] Damper (A) [33] Stopper Ring [36] Stopper ring jig (A) (J-341) Fig.

  • Page 35: Reassembly

    Lock Plate [48]. Fill Molub Alloy No. 777-1 grease in the ball portion of the Reciprocating Bearing [51]. Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [20] for the Steel Ball D7.0 [16] and Change Lever (A) [19].
  • Page 36 (3) Mounting Change Lever (A) [19] Before mounting Change Lever (A) [19], reassemble the lock plate ass'y (Lock Plate [48], Second Pinion [43], Clutch Spring [44] and Clutch [45]) as shown in Fig. 16-2. Mount the lock plate ass'y to rails (A) and (B) of Gear Cover (A) [10] (Fig. 22). At this time, fit the Lock Plate [48] properly in rail (A) and rail (B) as shown in Fig.
  • Page 37 (6) Mounting the Piston [39] Mount the Piston [39] facing its two 2-mm diameter holes to Second Shaft (A) [49] as shown in Fig. 25. Striker [37] Piston [39] Inner Cover Ass'y [42] Second Shaft (A) [49] Reciprocating Bearing [51] First Gear [53] Fig.

  • Page 38: Precautions On Disassembly And Reassembly Of The Charger

    (8) Perform wiring as shown in Fig. 27. Upper side + brown Lower side blue Viewed from "A" Section B-B Internal wire Blue Internal wire Brown Internal wire Internal wire Black Internal wire Black Internal wire Fig. 27 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.

  • Page 39: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed DH 24DVA Work Flow Grip Cover Armature and Housing (A).(B) Pinion Ass'y O-ring (P-22) Ball Bearing (608DD) Magnet Ball Bearing (608DD) Brush Holder Terminal Support DC-speed Control Switch General Assembly...
  • Page 40 Hitachi Power Tools LIST NO. G842 ELECTRIC TOOL PARTS LIST CORDLESS ROTARY HAMMER 2006 • • Model DH 24DVA (E1)
  • Page 41 PARTS DH 24DVA ITEM CODE NO. DESCRIPTION REMARKS USED 306-345 FRONT CAP 306-340 STOPPER RING 323-154 GRIP 324-528 BALL HOLDER 324-526 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 42 PARTS DH 24DVA ITEM CODE NO. REMARKS DESCRIPTION USED 323-152 COLLAR 323-153 FIRST GEAR 301-663 SPACER 323-170 PINION 626-VVM BALL BEARING 626VVC2PS2L 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.

  • Page 43: Standard Accessories

    STANDARD ACCESSORIES DH 24DVA ITEM CODE NO. DESCRIPTION REMARKS USED 323-155 SIDE HANDLE 303-709 DEPTH GAUGE CHARGER (MODEL UC 24YFB) 323-350 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 303-332 HAMMER DRILL CHUCK SET 13MM 1 INCLUD. 602, 603...
  • Page 44 OPTIONAL ACCESSORIES DH 24DVA ITEM CODE NO. REMARKS DESCRIPTION USED 303-627 CORE BIT SHANK (SDS PLUS) 45-90MM 300L 306-885 DUST COLLECTOR (B) ASS’Y INCLUD. 644 306-910 SOCKET ADAPTER (B) 944-460 TAPER SHANK DRILL BIT D11X100 944-461 TAPER SHANK DRILL BIT D12.3X110 993-038 TAPER SHANK DRILL BIT D12.7X110...
  • Page 45 DH 24DVA ITEM CODE NO. DESCRIPTION REMARKS USED --- 6 --- Printed in Japan 1 -- 06 (060120N)

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