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Hitachi DH 24PF Technical Data And Service Manual

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MODEL
DH 24PF
Hitachi
Power Tools
D
TECHNICAL DATA
ROTARY HAMMER
AND
DH 24PF
SERVICE MANUAL
LIST No. E478
May 2004
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi DH 24PF

  • Page 1 MODEL DH 24PF Hitachi Power Tools TECHNICAL DATA ROTARY HAMMER DH 24PF SERVICE MANUAL LIST No. E478 May 2004 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 ..........................30 9-4. Wiring Diagram ..........................31 9-5. Internal Wire Arrangement and Wiring Work ..................31 9-6. Insulation Tests ..........................32 9-7. No-load Current Value ........................32 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ................ 33 Assembly Diagram for DH 24PF...

  • Page 4: Product Name

    The latter is suitable for chiseling and grooving work. The Model DH 24PF is equipped with a variable locking mechanism that allows the angle of a tool such as a flat chisel to be adjusted in 36 positions in the "hammering only" function mode.

  • Page 5: Selling Points

    4. SELLING POINTS Class-top drilling speed Improved resistance to grease leakage New and powerful design One-push tool retainer Push-button type forward- reverse changeover switch Non-slip double-layer molded handle --- 2 ---...

  • Page 6: Selling Point Descriptions

    (2) Variable locking mechanism The Model DH 24PF is equipped with a variable locking mechanism that allows the angle of a tool such as a cold chisel or a cutter to be rotated conveniently to 36 individual positions in relation to the work in the "hammering only"...

  • Page 7: Specifications

    5. SPECIFICATIONS 5-1. Specifications Model DH 24PF 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. 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 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 24PF DH 24PE (S) 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. 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 15: 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. 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 24PF 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 24PF more compact for easier handling and operation. Thus, the appearance of the Model DH 24PF 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 24PF, 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 24PF 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 24PF 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: Three-Mode" Changeover Mechanism

    8-3. "Three-Mode" Changeover Mechanism The change lever of the Model DH 24PF 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 22 (2) Rotation only (Fig. 6) 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 23 (4) Neutral (Fig. 8) The Model DH 24PF 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 24: 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. 9. 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 25: Chuck Section

    8-6. Dust Collector (B) When drilling holes overhead, dust collector (B) can be mounted on the Model DH 24PF 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 26 Washer Steel Ball D6.35 Fig. 12 Dust collector (B) surface --- 23 ---...

  • Page 27: 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 28 (2) Removal of the change lever As shown in Fig. 15, pressing the Pushing Button [12] hard, turn the Change Lever [14] 45û counterclockwise from the "hammering only" positin ( mark). Pry out the Change Lever [14] at this position. Pushing Button [12] Change Lever [14] Fig.
  • Page 29 (4) Removal of the cylinder and the second gear (slip mechanism section) Remove the Gear Cover [10] from the Inner Cover [41] and remove the entire tool retainer. Remove the Retaining Ring for D20 Shaft [8] with a retaining ring puller. Stand the Gear Cover [10] in this state and pull out the Cylinder [24] from the Gear Cover [10] with a hand press.
  • Page 30 (6) Removal of the gear cover and the pinion sleeve Pinch the Pinion Sleeve [44] with the pinion sleeve puller (J-302, No. 319265) and fix the pinion sleeve puller to a vise. Pull the Gear Cover [10] to remove the Pinion Sleeve [44] from the Gear Cover [10] (Figs. 19 and 20).

  • Page 31: Reassembly

    10 g in the inner cover groove. Apply Molub Alloy No. 777-1 grease to the pin portion of the Change Lever [14]. Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [15] for the Steel Ball D7.0 [23] and the Change Lever [14].
  • Page 32 (5) Mounting the piston Mount the Piston [39] facing its two 2-mm diameter holes to the Second Shaft [49] as shown in Fig. 22. Inner Cover [41] Striker [37] Piston [39] Second Shaft [49] 2 mm dia. hole (2 pcs.) First Gear [51] Reciprocating Bearing [50]...

  • Page 33: Tightening Torque

    9-3. Tightening Torque Tapping Screws D4 [61] [73] [77] [80] ........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 34: Wiring Diagram

    9-4. Wiring Diagram Forward-reverse changeover switch Variable speed switch Stator Blue White Gray Cord Brown Black Stator Fig. 24 9-5. Internal Wire Arrangement and Wiring Work A. Internal wire arrangement Put the internal wires coming from the Stator 120V [62] under the Brush Holder [71]. Brown (CB) Black (Stator)

  • Page 35: Insulation Tests

    B. Additional wiring work General internal wiring can be accomplished by referring to (CB) (Stator) 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 36: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed DH 24PF Work Flow Handle Cover Switch (A) Cord Armor Cord Housing Stator Armature Ass'y O-ring (P-22) Ball Bearing (608DD) Ball Bearing (608VV) General Assembly Front Cap Second Hammer...
  • Page 37 Hitachi Power Tools LIST NO. E478 ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2004 • • Model DH 24PF (E1)
  • Page 38 PARTS DH 24PF ITEM CODE NO. DESCRIPTION REMARKS USED 306-345 FRONT CAP 306-340 STOPPER RING 322-809 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.) 301-654 TAPPING SCREW (W/FLANGE) D5X35...
  • Page 39 PARTS DH 24PF ITEM CODE NO. REMARKS DESCRIPTION USED 301-663 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) 360-644U ARMATURE ASS’Y 120V 1 INCLUD. 57, 58, 63...

  • Page 40: Standard Accessories

    STANDARD ACCESSORIES DH 24PF ITEM CODE NO. DESCRIPTION REMARKS USED 323-129 CASE 303-659 SIDE HANDLE 310-331 DEPTH GAUGE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 980-927 GREASE FOR HAMMER.HAMMER DRILL (500G) 981-840 GREASE (A) FOR HAMMER.HAMMER DRILL (30G) 308-471 GREASE FOR HAMMER.HAMMER DRILL (70G)
  • Page 41 OPTIONAL ACCESSORIES DH 24PF ITEM CODE NO. REMARKS DESCRIPTION USED 944-500 TAPER SHANK DRILL BIT D14.5X110 944-463 TAPER SHANK DRILL BIT D17.5X120 944-464 TAPER SHANK DRILL BIT D21.5X140 320-859 SYRINGE (BLOW-OUT BULB TYPE) 303-046 BULL POINT (SDS+) 250MM (ROUND SHANK TYPE) 303-044 CHEMICAL ANCHOR ADAPTER (SDS+) 12.7MMX90L...
  • Page 42 DH 24PF ITEM CODE NO. DESCRIPTION REMARKS USED --- 6 --- Printed in Japan 5 -- 04 (040530N)

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