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Hitachi DH 24PD3 Technical Data And Service Manual

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MODEL
DH 24PD3
Hitachi
Power Tools
D
TECHNICAL DATA
ROTARY HAMMER
AND
DH 24PD3
SERVICE MANUAL
LIST No. E492
Sept. 2005
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi DH 24PD3

  • Page 1 MODEL DH 24PD3 Hitachi Power Tools TECHNICAL DATA ROTARY HAMMER DH 24PD3 SERVICE MANUAL LIST No. E492 Sept. 2005 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 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 GAH500DSR BOSCH HR2430 MAKITA MAKITA HR2432...

  • Page 3: Table Of Contents

    9-3. Tightening Torque ......................... 29 9-4. Wiring Diagrams ........................... 30 9-5. Internal Wire Arrangement and Wiring Work ................31 9-6. Insulation Tests ..........................33 9-7. No-load Current Values......................... 33 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............34 Assembly Diagram for DH 24PD3...

  • Page 4: Product Name

    2. MARKETING OBJECTIVE The Model DH 24PD3 is an upgraded version of the current Model DH 24PD2, 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

    4-1. Selling Point Descriptions 4-1-1. Class-top drilling speed The drilling speed of the Model DH 24PD3 is 1.5 times higher than B and 1.3 times higher than C and D thanks to the efficient transmission of the hammering energy. 4-1-2. More comfortable and frisky drilling The Model DH 24PD3 can drill holes more comfortably and friskily with a light pushing force because the quantity of body jumping is 20% less than C.

  • Page 6: Specifications

    5. SPECIFICATIONS 5-1. Specifications Model DH 24PD3 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 7: 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 8 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 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 9 (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 10 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 11 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 12: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons Maker Model • HITACHI HITACHI Item DH 24PD3 DH 24PD2 24 (15/16") 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") 13 (1/2") Steel Wood 32 (1-1/4")

  • Page 13: 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. Fig. 1 [Test conditions] Direction : Downward drilling Pushing force : 98 N (10 kgf) Test material : Concrete panel with a compression strength of 2,352 N/cm (240 kgf/cm...

  • Page 14: Dust Collection Efficiency Comparison

    6-3. Dust Collection Efficiency Comparison Dust collection efficiency varies considerably depending on the work conditions. Use the factory test results shown in Fig. 2 for comparison purpose only. Figure 2 shows a comparison of dust collection efficiency based on the drilling of 50 mm (2") holes into wall material with a dia. 14.5 mm (9/16") drill bit. Fig.

  • 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 24PD3 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

    8-2. Dust Collection Mechanism As illustrated in Fig. 3, the Model DH 24PD3 is provided with a dust fan chamber, consisting of casing (A) and casing (B), located between the gear cover and housing. Dust is drawn in from the nozzle of the dust collection adapter ass'y by the suction provided by the dust fan mounted inside the dust fan chamber, and is deposited in the dust bag.
  • Page 17 Nozzle seal Rubber cap Drill bit Side handle Washer Section Nozzle (A) (B) Pipe (A) Stroke (Drilling depth) Tail cap Spring Adapter holder Hose Pipe (B) O-ring Stopper Fig. 4 --- 14 ---...

  • Page 18: Tool Structure

    Model DH 24PD3 more compact for easier handling and operability. Thus, the appearance of the Model DH 24PD3 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 assembled on the second shaft via the first gear, engages the second gear mounted on the outer circumference of the cylinder.
  • Page 19 O-ring be replaced approximately once a year, depending on the frequency of usage of the tool. Idle hammering prevention mechanism The idle hammering prevention mechanism in the Model DH 24PD3 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 20 Fig. 7 Slip mechanism The slip mechanism in the Model DH 24PD3 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 21: Rotation Only" And "Rotation + Hammering" Changeover Mechanism

    Speed control The Model DH 24PD3 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 22: Drill Bits

    8-6. Drill Bits The chuck section is designed exclusively for the popular and widely available SDS-plus shank bits, as shown in Fig. 8. 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 23: Chuck Section

    8-8. Dust Collector (B) When drilling holes overhead, dust collector (B) can be mounted on the Model DH 24PD3 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 24 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) Dust cover Socket Seal cover Retaining ring for D30 shaft Outer race Washer Steel Ball D6.35 Fig.

  • Page 25: Precautions In Disassembly And Reassembly

    9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY The [Bold] numbers in descriptions below correspond to the item numbers in the Parts List and exploded assembly diagrams. 9-1. Disassembly (1) Disassembly of the dust collection mechanism: Refer to Fig. 12 and Fig. 13. Remove the four Tapping Screws (W/Flange) D5 x 90 [9] which fix the Gear Cover [10], provided between Casing (B) [46] and the Gear Cover [10] (including the Inner Cover Ass'y [40]), and turn the screwdriver gently to open a gap between them.
  • Page 26 (2) Disassembly of the dust collection adapter ass'y Disassembly of the Hose Ass'y [101] only Loosen the knob that fixes the stopper, and push pipe (A) to its maximum stroke position. This will cause the Hose Ass'y [101] connection portion of pipe (A) to come out of the rear end of pipe (B). In that state, pull on the Hose Ass'y [101] to separate it from pipe (A).
  • Page 27 Change Lever [25] Pushing Button [22] Fig. 15 (4) Disassembly of the tool retainer Slide the Grip [3] fully in the arrow direction as shown in Fig. 16 and remove the Front Cap [1]. Pulling the Grip [3] as shown in Fig. 17, remove the Stopper Ring [2] with a retaining ring puller. Then the Grip [3], Ball Holder [4], Steel Ball D7.0 [17], Holder Plate [5], Holder Spring [6] and Washer (B) [7] can be removed from the Cylinder [18].
  • Page 28 (6) Disassembly of the cylinder and the second hammer Remove the Stopper Ring [35] from the inside diameter portion of the Cylinder [18]. Then the Second Hammer [28], O-ring (1AP-20) [29], Damper Holder [30], O-ring (B) [31], Damper (A) [32], O-ring (C) [33] and Hammer Holder [34] can be removed from the Cylinder [18].

  • Page 29: Reassembly

    Apply Molub Alloy No. 777-1 grease to the outer circumference of the Clutch [60] groove and the pin portion of the Change Lever [25]. Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [24] for the Steel Ball D7.0 [17] and the Change Lever [25].
  • Page 30 (4) Mounting the Cylinder [18] Mount the Second Hammer [28], O-ring (1AP-20) [29], Damper Holder [30], O-ring (B) [31], Damper (A) [32], new O-ring (C) [33] and Hammer Holder [34] in the Cylinder [18]. Push the new Stopper Ring [35] into the Cylinder [18] then push in the hole side of stopper ring jig (A) (J-341) on it as shown in Fig.
  • Page 31 (6) Press-fitting the first gear Press-fit the First Gear [62] aligning with the shaft end surface of the Second Shaft [57]. After press-fitting the First Gear [62], check that the inside ring of the Reciprocating Bearing [61] turns smoothly. (7) Reassembly of the oil seal Prior to reassembly, apply grease to the inner circumference of the Oil Seal [12].

  • Page 32: Tightening Torque

    (9) Mounting the piston Mount the Piston [38] as shown in Fig. 24. Inner Cover Ass'y [40] Piston [38] Striker [36] Second Shaft [57] Reciprocating Bearing [61] First Gear [62] Fig. 24 9-3. Tightening Torque Tapping Screws D4 [73] [92] ............2.0 0.5 N m (20 5 kgf...

  • Page 33: Wiring Diagrams

    9-4. Wiring Diagrams (1) Products with noise suppressor Fig. 25 (2) Products without noise suppressor Fig. 26 --- 30 ---...

  • Page 34: Internal Wire Arrangement And Wiring Work

    9-5. Internal Wire Arrangement and Wiring Work A. Internal wire arrangement (1) Product with noise suppressor Brown (Choke coil) Black (Stator) Choke Coil (A) Brown [78] Gray (Stator) Choke Coil (A) Blue [81] White (Stator) White (Stator) Red (Stator) Blue (Choke coil) Noise Suppressor [87] Black or brown White or blue...
  • Page 35 (2) Product without noise suppressor Brown (CB) Black (Stator) Gray (Stator) White (Stator) White (Stator) Red (Stator) Blue (CB) Black or brown White or blue Fig. 28 --- 32 ---...

  • Page 36: 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 37: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed DH 24PD3 Work Flow Handle Cover Switch Cord Armor Cord Housing Stator Casing (B) Armature O-ring (P-22) Casing (A) Ball Bearing Ball Bearing (608DD) (6001DπD) Seal Plate Ball Bearing...
  • Page 38 Hitachi Power Tools LIST NO. E492 ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2005 • • Model DH 24PD3 (E1)
  • Page 39 PARTS DH 24PD3 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.) 302-210 TAPPING SCREW (W/FLANGE) D5X90...
  • Page 40 PARTS DH 24PD3 ITEM CODE NO. REMARKS DESCRIPTION USED 324-545 VALVE 324-544 FELT PACKING (B) 302-371 O-RING 322-795 SPACER 322-796 SPRING (B) 322-794 SECOND SHAFT 301-659 WASHER (B) 301-660 CLUTCH SPRING 324-532 CLUTCH 324-533 RECIPROCATING BEARING 322-797 FIRST GEAR 626-VVM...
  • Page 41 PARTS DH 24PD3 ITEM CODE NO. DESCRIPTION REMARKS USED 302-076 HOSE ASS’Y INCLUD. 102 873-095 O-RING (P-16) 302-386 RAIL 302-048 DUST BAG ASS’Y (DEEP BLUE) INCLUD. 103 --- 4 --- * ALTERNATIVE PARTS 9 -- 05...

  • Page 42: Standard Accessories

    STANDARD ACCESSORIES DH 24PD3 ITEM CODE NO. DESCRIPTION REMARKS USED 325-099 CASE 324-548 SIDE HANDLE 302-374 OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 981-840 GREASE (A) FOR HAMMER. HAMMER DRILL (30G) 308-471 GREASE FOR HAMMER. HAMMER DRILL (70G) 980-927 GREASE FOR HAMMER.
  • Page 43 OPTIONAL ACCESSORIES DH 24PD3 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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