Hitachi DH 24PB3 Technical Data And Service Manual
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Hitachi DH 24PB3 Technical Data And Service Manual

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See also: Operation Manual & Safety Instructions , Instruction Manual
MODEL
DH 24PB3
Hitachi
Power Tools
D
TECHNICAL DATA
ROTARY HAMMER
AND
DH 24PB3
SERVICE MANUAL
LIST No. E488
May 2005
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi DH 24PB3

  • Page 1 MODEL DH 24PB3 Hitachi Power Tools TECHNICAL DATA ROTARY HAMMER DH 24PB3 SERVICE MANUAL LIST No. E488 May 2005 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...

  • Page 2: Table Of Contents

    9-3. Tightening Torque ..........................26 9-4. Wiring Diagrams ..........................27 9-5. Internal Wire Arrangement and Wiring Work ..................28 9-6. Insulation Tests ..........................30 9-7. No-load Current Values ........................30 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ................ 31 Assembly Diagram for DH 24PB3...
  • Page 3 REMARK: Throughout this TECHNICAL DATA AND SERVICE MANUAL, symbols are used in the place of company names and model names of our competitors. The symbols utilized here are as follows: Competitors Symbols Utilized Company Name Model Name HR2440 MAKITA GBH2SR BOSCH...

  • Page 4: Product Name

    2. MARKETING OBJECTIVE The Model DH 24PB3 is an upgraded version of the current Model DH 24PB2, which features the concrete drilling capacity with the maximum drill bit diameter 24 mm and the use of SDS-plus shank tools. The performance and the durability are greatly improved.

  • Page 5: Selling Points

    4. SELLING POINTS Class-top drilling speed More comfortable and frisky drilling New and powerful design Non-slip double-layer Compact body molded handle Non-slip double-layer molded gear cover Internal pressure adjustment mechanism --- 2 ---...

  • Page 6: Selling Point Descriptions

    4-1. Selling Point Descriptions 4-1-1. Class-top drilling speed The drilling speed of the Model DH 24PB3 is 1.4 times higher than B and 1.2 times higher than C thanks to the efficient transmission of the hammering energy. 4-1-2. More comfortable and frisky drilling The Model DH 24PB3 can drill holes more comfortably and friskily with a light pushing force because the quantity of body jumping is 20% less than C.

  • Page 7: Specifications

    5. SPECIFICATIONS 5-1. Specifications Model DH 24PB3 Capacity Concrete 3.4 --- 24 mm (1/8" --- 15/16") Steel 13 mm (1/2") Wood 32 mm (1-1/4") Power source AC single phase 50 Hz or 60 Hz Voltage, current and input Voltage (V)

  • Page 8: Optional Accessories

    5-2. Optional Accessories A. Drilling anchor holes (rotation + hammering) 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 9 B. Anchor setting Anchor setting bar to permit anchor setting operation with the rotary hammer 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 10 (2) Guide plate Core bit (outer diameter ) (mm) Code No. Core bit (outer diameter ) Code No. 32 (1-1/4") 50 (2") 982686 982690 35 (1-3/8") 982687 38 (1-1/2") 982688 45 (1-25/32") 982689 (3) Core bit with guide plate (The guide plate is not equipped with core bit with outer diameter of 25 mm (31/32") and 29 mm (1-5/32").) Outer diameter (mm) Code No.
  • Page 11 F. Drilling hole and driving screw (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) (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 Chuck wrench...
  • Page 12 G. 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 13VLA drill chuck and chuck adapter (D) cannot be used for reverse rotaion. If reverse rotation is to be used for loosening screws, use the plus bit (Bit No.

  • Page 13: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons Maker Model • HITACHI HITACHI Item DH 24PB3 DH 24PB2 24 (15/16") 24 (15/16") 24 (15/16") 24 (15/16") Concrete 13 (1/2") 13 (1/2") 13 (1/2") 13 (1/2") Capacity Steel 32 (1-1/4") Wood 32 (1-1/4")

  • Page 14: Drilling Speed Comparison

    6-2. Drilling Speed Comparison Drilling speed varies considerably depending on the work conditions. Use the factory test results shown in Fig. 1 for comparison purpose only. 800.0 HITACHI DH 24PB3 700.0 600.0 HITACHI DH 24PB2 500.0 400.0 300.0 200.0 100.0 Drill bit dia.

  • Page 15: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model DH 24PB3 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 attached to each tool.

  • Page 16: Reference Material

    Model DH 24PB3 more compact for easier handling and operability. Thus, the appearance of the Model DH 24PB3 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 pinion provided on the second shaft engages the second gear mounted on the outer circumference of the cylinder.
  • Page 17 Accordingly, the armature shaft and the cylinder axis are at a right angle to each other. In the Model DH 24PB3, through adoption of a spiral drive system (a mechanism using a reciprocating bearing), a more compact design has been achieved by arranging the armature shaft in parallel with the cylinder axis.
  • Page 18 Idle hammering prevention mechanism The idle hammering prevention mechanism in the Model DH 24PB3 is different from that of conventional rotary hammers. 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 19 Fig. 4 Slip mechanism The slip mechanism in the Model DH 24PB3 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 20: Rotation Only" And "Rotation + Hammering" Changeover Mechanism

    Speed control The Model DH 24PB3 is equipped with a variable speed control switch which permits free change of the rotation speed and hammering force. When drilling in fragile materials, pull the switch trigger gently for low rotation speed (hammering force) to achieve optimum results. Note that the switch trigger cannot be pulled to the full but up to the half in the reverse drilling, and the speed is about half of the forward drilling.

  • Page 21: 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. 5. 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 22: Chuck Section

    8-7. Dust Collector (B) When drilling holes overhead, dust collector (B) can be mounted on the Model DH 24PB3 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 23 Approx. 72 mm (2-27/32") Approx. 16 mm (5/8") Grip (on the main body side) Drill bit length = 166 mm Drill bit length = 110 mm Socket adapter (B) Seal cover Socket Dust cover Retaining ring for D30 shaft Outer race Washer Steel Ball D6.35 Fig.

  • Page 24: 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 [27] with a drill bit or a screwdriver. Remove the Striker [35] chucked by O-ring (C) [32].
  • Page 25 (2) Disassembly of the tool retainer Slide the Grip [3] fully in the arrow direction as shown in Fig. 10 and remove the Front Cap [1]. Pulling the Grip [3] as shown in Fig. 11, remove the Stopper Ring [2] with a retaining ring puller. Then the Grip [3], Ball Holder [4], Steel Ball D7.0 [21], Holder Plate [5], Holder Spring [6] and Washer (B) [7] can be removed from the Cylinder [22].
  • Page 26 (4) Disassembly of the cylinder and the second hammer Remove the Stopper Ring [34] from the inside diameter portion of the Cylinder [22]. Then the Second Hammer [27], O-ring (1AP-20) [28], Hammer Holder [29], O-ring (B) [30], Damper (A) [31], O-ring (C) [32] and Damper Holder [33] can be removed from the Cylinder [22].

  • Page 27: Reassembly

    Apply Molub Alloy No. 777-1 grease to the outer circumference of the Clutch [50] groove and the pin portion of the Change Lever [20]. Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [19] for the Steel Ball D7.0 [21] and the Change Lever [20].
  • Page 28 Change Lever [20] Pushing Button [17] Fig. 14 (4) Press-fitting the first gear Press-fit the First Gear [52] aligning with the shaft end surface of the Second Shaft [47]. After press-fitting the First Gear [52], check that the inside ring of the Reciprocating Bearing [51] turns smoothly. (5) Reassembly of the oil seal Prior to reassembly, apply grease to the inner circumference of the Oil Seal [12].

  • Page 29: Tightening Torque

    (7) Mounting the piston Mount the Piston [37] as shown in Fig. 16. Inner Cover Ass'y [39] Piston [37] Striker [35] Second Shaft [47] Reciprocating Bearing [51] First Gear [52] Fig. 16 9-3. Tightening Torque Tapping Screws D4 [61] [79] ............2.0 0.5 N m (20 5 kgf...

  • Page 30: Wiring Diagrams

    9-4. Wiring Diagrams (1) Products with noise suppressor Fig. 17 (2) Products without noise suppressor Fig. 18 --- 27 ---...

  • Page 31: Internal Wire Arrangement And Wiring Work

    9-5. Internal Wire Arrangement and Wiring Work A. Internal wire arrangement (1) Product with noise suppressor Choke Coil (A) Blue [69] Choke Coil (A) Brown [66] [75] Fig. 19 --- 28 ---...
  • Page 32 (2) Product without noise suppressor Fig. 20 --- 29 ---...

  • Page 33: Insulation Tests

    B. Additional wiring work General internal wiring can be accomplished by referring to paragraphs 9-4 and 9-5-A. The following are special instructions for switch connection. (1) Wiring of reversing switch Insert the lead wire (black) coming from the stator into the terminal (4) of the reversing switch, and the lead wire (white) into the terminal (3) as shown in Fig.

  • Page 34: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed DH 24PB3 Work Flow Handle Cover Switch Cord Armor Cord Housing Stator Armature O-ring (P-22) Ball Bearing (608DD) Ball Bearing (608VV) General Assembly Front Cap Second Hammer Cylinder Grip...
  • Page 35 Hitachi Power Tools LIST NO. E488 ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2005 • • Model DH 24PB3 (E1)
  • Page 36 PARTS DH 24PB3 ITEM CODE NO. DESCRIPTION REMARKS USED 306-345 FRONT CAP 306-340 STOPPER RING 324-527 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.) 301-654 TAPPING SCREW (W/FLANGE) D5X35...
  • Page 37 PARTS DH 24PB3 ITEM CODE NO. REMARKS DESCRIPTION USED 322-797 FIRST GEAR 626-VVM BALL BEARING 626VVC2PS2L 322-816 FELT PACKING 876-796 O-RING (P-22) 322-818 PACKING WASHER 608-DDM BALL BEARING 608DDC2PS2L 982-631 WASHER (A) 360-720U ARMATURE ASS’Y 110V-120V INCLUD. 57, 58, 63...
  • Page 38 PARTS DH 24PB3 ITEM CODE NO. DESCRIPTION REMARKS USED 500-456Z CORD (CORD ARMOR D8.8) FOR CHN 500-465Z CORD (CORD ARMOR D8.8) FOR GBR (110V) 500-446Z CORD (CORD ARMOR D8.8) FOR GBR (230V) 500-475Z CORD (CORD ARMOR D8.8) FOR KOR --- 4 ---...

  • Page 39: Standard Accessories

    STANDARD ACCESSORIES DH 24PB3 ITEM CODE NO. DESCRIPTION REMARKS USED 324-555 CASE 324-548 SIDE HANDLE 303-709 DEPTH GAUGE 310-331 DEPTH GAUGE 1 FOR USA, CAN OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 981-840 GREASE (A) FOR HAMMER. HAMMER DRILL (30G) 308-471 GREASE FOR HAMMER.
  • Page 40 OPTIONAL ACCESSORIES DH 24PB3 ITEM CODE NO. DESCRIPTION REMARKS USED 971-800 ANCHOR SETTING ADAPTER B W5/16” (MANUAL) 971-801 ANCHOR SETTING ADAPTER B W3/8” (MANUAL) 971-802 ANCHOR SETTING ADAPTER B W1/2” (MANUAL) 971-803 ANCHOR SETTING ADAPTER B W5/8” (MANUAL) 944-460 TAPER SHANK DRILL BIT D11X100 944-461 TAPER SHANK DRILL BIT D12.3X110...

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