Hitachi DH 24PF3 Technical Data And Service Manual
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Hitachi DH 24PF3 Technical Data And Service Manual

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See also: Operation Manual & Safety Instructions , Instruction Manual
MODEL
DH 24PF3
Hitachi
Power Tools
D
TECHNICAL DATA
ROTARY HAMMER
AND
DH 24PF3
SERVICE MANUAL
LIST No. E490
May 2005
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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  • Page 1 MODEL DH 24PF3 Hitachi Power Tools TECHNICAL DATA ROTARY HAMMER DH 24PF3 SERVICE MANUAL LIST No. E490 May 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 11224VSR BOSCH HR2455 MAKITA...

  • Page 3: Table Of Contents

    9-3. Tightening Torque ..........................32 9-4. Wiring Diagram ........................... 32 9-5. Internal Wire Arrangement and Wiring Work ..................32 9-6. Insulation Tests ........................... 33 9-7. No-load Current Values ........................33 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ................34 Assembly Diagram for DH 24PF3...

  • Page 4: Product Name

    Hitachi Rotary Hammer, Model DH 24PF3 2. MARKETING OBJECTIVE The new Model DH 24PF3 is a 3-mode type rotary hammer with a D-shaped handle based on the Model DH 24PC3 rotary hammer drill. It features the "rotation + hammering" mode, "rotation only" mode and "hammering only"...

  • Page 5: Selling Points

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

  • Page 6: Selling Point Descriptions

    4-1-3. Class-top drilling speed The drilling speed of the Model DH 24PF3 is 1.4 times higher than B and 1.2 times higher than C thanks to the efficient transmission of the hammering energy. 4-1-4. More comfortable and frisky drilling The Model DH 24PF3 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 24PF3 Capacity Concrete 3.4 to 24 mm (1/8" to 15/16") Steel 13 mm (1/2") Wood 32 mm (1-1/4") Power source AC single phase 60 Hz Voltage (V) Current (A) Input (W) Voltage, current and input...

  • 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 (hammering only) 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...
  • Page 10 (3) Core bit with guide plate (The guide plate is not supplied with 25 mm (31/32") and 29 mm (1-5/32") outer diameter core bits.) Outer diameter (mm) Code No. Outer diameter (mm) Code No. 25 (31/32") 45 (1-25/32") 982672 982677 29 (1-5/32") 50 (2") 982673...
  • Page 11 G. Grooving (hammering only) Grooving chisel (SDS-plus shank) Code No. 316659 H. 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) (Note) If the tool is to be used for loosening screws, open the three jaws...
  • Page 12 I. Drilling 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 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 24PF3 DH 24PF 24 (15/16") 24 (15/16") 22 (7/8") 25 (1") Concrete 13 (1/2") 13 (1/2") 13 (1/2") 13 (1/2") Capacity Steel 25 (1") 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 24PF3 700.0 600.0 HITACHI DH 24PF 500.0 400.0 300.0 200.0 100.0 Drilling dia.

  • Page 15: 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/30 min.) Voltage Maker Model supply HITACHI DH 24PF3 HITACHI DH 24PF 120 V Fig. 2 --- 12 ---...

  • Page 16: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model DH 24PF3 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 17: Reference Material

    Model DH 24PF3 more compact for easier handling and operation. Thus, the appearance of the Model DH 24PF3 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 18 Accordingly, the armature shaft and the cylinder axes are also at right angles to each other. In the Model DH 24PF3, 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 19 Idle hammering prevention mechanism The idle hammering prevention mechanism in the Model DH 24PF3 is different from that of conventional rotary hammers. When the drill bit is lifted from the work surface on completion of drilling, the second hammer moves to the position indicated by the continuous lines in Fig.
  • Page 20 Slip mechanism The slip mechanism in the Model DH 24PF3 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 six matching claws provided on the face of the second gear, by which rotation is transmitted to the cylinder.
  • Page 21 Internal pressure adjustment mechanism An air passage is provided as shown in Fig. 5 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 22: Three-Mode" Changeover Mechanism

    8-3. "Three-Mode" Changeover Mechanism The change lever of the Model DH 24PF3 permits quick and easy changeover among the "rotation and hammering", "rotation only" and "hammering only" functions. Each function mode is explained below. When operating the change lever, be sure to continue pressing the pushing button.
  • Page 23 (2) Rotation only (Fig. 7) 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 24 (4) Neutral (Fig. 9) The Model DH 24PF3 has a neutral mode used for positioning a tool such as a flat chisel. Adjust the change lever to a position halfway between "hammering only" ( mark) and "rotation and hammering" ( marks).

  • Page 25: Drill Bits

    8-4. Drill Bits The chuck section is designed exclusively for the popular and widely available SDS-plus shank bits, as shown in Fig. 10. 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 coming off.

  • Page 26: Chuck Section

    8-6. Dust Collector (B) When drilling holes overhead, dust collector (B) can be mounted on the Model DH 24PF3 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 27 Washer Steel ball D6.35 Fig. 13 Dust collector (B) surface --- 24 ---...

  • Page 28: Precautions In Disassembly And Reassembly

    9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram. 9-1. Disassembly (1) Disassembly of the striking mechanism section Push the Second Hammer [29] in the main body with a drill bit or screwdriver to release the Striker [37] from O-ring (C) [34].
  • Page 29 (2) Removal of the change lever As shown in Fig. 16, pressing the Pushing Button [18] hard, turn the Change Lever [21] 45û counterclockwise from the "hammering only" positin ( mark). Pry out the Change Lever [21] at this position. Pushing Button [18] Change Lever [21] Fig.
  • Page 30 (4) Removal of the cylinder and the second gear (slip mechanism section) Remove the Gear Cover Ass'y [10] from the Inner Cover Ass'y [41] and remove the entire tool retainer. Remove the Retaining Ring for D20 Shaft [8] with a retaining ring puller. Stand the Gear Cover Ass'y [10] in this state and pull out the Cylinder [24] from the Gear Cover Ass'y [10] with a hand press.
  • Page 31 (6) Removal of the gear cover and the pinion sleeve Pinch the Pinion Sleeve [47] with the pinion sleeve puller (J-302, No. 319265) and fix the pinion sleeve puller to a vise. Pull the Gear Cover Ass'y [10] to remove the Pinion Sleeve [47] from the Gear Cover Ass'y [10] (Figs.

  • Page 32: Reassembly

    Lock Plate [48]. Fill Molub Alloy No. 777-1 grease in the ball portion of the Reciprocating Bearing [53]. Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [20] for the Steel Ball D7.0 [23] and the Change Lever [21].
  • Page 33 (3) Reassembly of the change lever Press the Pushing Button [18] deeply into the hole of the Change Lever [21]. Adjust the Change Lever [21] to the position shown in Fig. 23 of the Gear Cover Ass'y [10] and press it hard. Then move the Change Lever [21] to the "hammering only"...
  • Page 34 (7) Mounting the piston Mount the Piston [39] as shown in Fig. 25. Inner Cover Ass'y [41] Piston [39] Striker [37] Second Shaft [52] First Gear [54] Reciprocating Bearing [53] Fig. 25 (8) Reassembly of the gear cover After reassembly as shown in Fig. 26, ensure that the Change Lever [21] is adjusted to the "hammering only" position.

  • Page 35: Tightening Torque

    9-3. Tightening Torque Tapping Screws D4 [64] [81] ............2.0 0.5 N m (20 5 kgf cm, 17.4 4.3 in-lbs.) • • Tapping Screws (W/Flange) D5 X 35 [9] ........2.9 0.5 N m (30 5 kgf cm, 26.0 4.3 in-lbs.) •...

  • 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 24PF3 Work Flow Handle Cover Switch Cord Armor Cord Housing Stator Armature Ass'y O-ring (P-22) Ball Bearing (608DD) Ball Bearing (608VV) General Assembly Front Cap Second Hammer Cylinder...
  • Page 38 Hitachi Power Tools LIST NO. E490 ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2005 • • Model DH 24PF3 (E1)
  • Page 39 PARTS DH 24PF3 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 324-605 GEAR COVER ASS’Y...
  • Page 40 PARTS DH 24PF3 ITEM CODE NO. REMARKS DESCRIPTION USED 323-180 SECOND SHAFT 324-533 RECIPROCATING BEARING 322-797 FIRST GEAR 322-795 SPACER 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...

  • Page 41: Standard Accessories

    STANDARD ACCESSORIES DH 24PF3 ITEM CODE NO. DESCRIPTION REMARKS USED 324-591 CASE 324-548 SIDE HANDLE 310-331 DEPTH GAUGE 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 42 OPTIONAL ACCESSORIES DH 24PF3 ITEM CODE NO. REMARKS DESCRIPTION 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...
  • Page 43 DH 24PF3 ITEM CODE NO. DESCRIPTION REMARKS USED --- 6 --- 5 -- 05 Printed in Japan (050520N)

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