Hitachi DH 22PG Technical Data And Service Manual
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Hitachi DH 22PG Technical Data And Service Manual

Hitachi rotary hammer technical data and service manual
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PRODUCT NAME
Hitachi Rotary Hammer
DH 22PG
Model
MARKETING OBJECTIVE
The new Model DH 22PG features the concrete drilling capability with the maximum drill bit diameter 22 mm and
the use of SDS-plus shank tools. This is a professional-use and low-priced rotary hammer.
The main features of the Model DH 22PG are as follows:
(1) Most compact and lightweight in its class: 289 mm in overall length and 1.9 kg in weight
(2) The internal pressure adjustment mechanism prevents grease leakage.
(3) The idle striking prevention mechanism prevents reciprocating motion during no-load operation to reduce
noise.
APPLICATIONS
Drilling holes in concrete, brick and stone
Drilling holes in steel and wood
Tightening and loosening machine screws and wood screws
SELLING POINTS
[ NEW FEATURES ]
Most compact and lightweight in its class for
ease of operation
Hitachi's own internal pressure adjustment
mechanism
Clutch-cut type idle striking prevention
mechanism
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. E497
Aug. 2007
International Sales Division

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  • Page 1 Model MARKETING OBJECTIVE The new Model DH 22PG features the concrete drilling capability with the maximum drill bit diameter 22 mm and the use of SDS-plus shank tools. This is a professional-use and low-priced rotary hammer. The main features of the Model DH 22PG are as follows: (1) Most compact and lightweight in its class: 289 mm in overall length and 1.9 kg in weight...
  • Page 2 REMARK: For more information about HANDLING INSTRUCTIONS, visit our website at: http://www.hitachi-koki.com/manual_view_export/ 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:...

  • Page 3: Table Of Contents

    4. Precautions for use of ”Rotation only” (no hammering) function------------------------------------13 5. Drill bits -----------------------------------------------------------------------------------------------------------13 6. Tool retainer section -------------------------------------------------------------------------------------------14 7. Dust collector (B) -----------------------------------------------------------------------------------------------15 REPAIR GUIDE----------------------------------------------------------------------------------------------------------------16 1. Precautions in disassembly and reassembly ------------------------------------------------------------16 STANDARD REPAIR TIME (UNIT) SCHEDULES--------------------------------------------------------------------26 Assembly diagram for DH 22PG...

  • Page 4: Selling Point Descriptions

    SELLING POINT DESCRIPTIONS Most compact and lightweight in its class* * Based on our own research The Model DH 22PG is most compact and lightweight in its class thanks to the optimum striking mechanism. HITACHI Maker Model DH 22PG Overall...

  • Page 5: Specifications

    SPECIFICATIONS 1. Specifications Capacity: Concrete Inch 13/24 Capacity: Steel/Wood Inch 1/2” / 1” Input power Impact energy No-load rpm (Forward) 0-1,500 No-load rpm (Reverse) 0-980 Full-Load bpm 0-6,200 Mode – Variable speed – Reverse switch type – Push button Handle Soft grip Gear cover No Overall length...

  • Page 6: Optional Accessories

    2. Optional accessories (1) Drilling anchor holes (rotation and hammering) Drill bit (SDS-plus shank) Effective length Overall length Overall Effective Overall Effective Outer dia. Outer dia. length length Code No. length length Code No. (mm) (mm) (mm) (mm) (mm) (mm) 303571 303592 12.5...
  • Page 7 Slender bit and adapter for slender shaft (SDS-plus shank) (1) Drill bit (slender shaft) (2) Adapter for slender shaft (SDS-plus shank) (1) Drill bit (slender shaft) (2) Adapter for slender shaft Outer dia. Overall length Effective length Code No. Code No. (mm) (mm) (mm)
  • Page 8 Part name Code No. 13 mm hammer drill chuck (including chuck wrench and rubber cap) 303332 Chuck wrench 303334 Rubber cap 303335 (2) Anchor setting Anchor setting bar Anchor setting adapter (SDS-plus shank) Overall Overall Part name Code No. Part name Code No.
  • Page 9 Part name Code No. Chuck adapter (G) 303623 13 mm drill chuck (with chuck wrench) 321814 Special screw (M6 left-hand threaded) 981122 (1) Cross-recessed head (Phillips) bit (2) Slotted-head (minus) bit [Overall length: 65 mm] [Overall length: 70 mm] (For use with cross-recessed head (Phillips) screw) (For use with slotted-head (minus) screw) Tip thickness Stamped bit No.

  • Page 10: Comparisons With Similar Products

    COMPARISONS WITH SIMILAR PRODUCTS (Superior specifications: 1. Specifications comparisons Maker HITACHI Model name DH22PG Capacity: Concrete Inch 7/8” 7/8” 13/16” 13/24 13/30 13/32 Capacity: Steel/Wood Inch 1/2” / 1” 1/2” / 1-3/16” 1/2” / 1-1/4” Input power Impact energy No-load rpm (Forward)

  • Page 11: Drilling Speed Comparison

    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 HITACHI DH22PG Drill bit dia.(mm) [Test conditions] Direction: Downward drilling Pushing force: 98 N (10 kgf)

  • Page 12: Precautions In Sales Promotion

    Safety Instructions In the interest of promoting the safest and most efficient use of the Model DH 22PG Rotary hammer by all of our customers, it is very important that at the time of sale, the salesperson carefully ensures that the...

  • Page 13: Reference Materials

    Piston reciprocating mechanism In the Model DH 22PG, through adoption of a spiral drive system (a mechanism using a reciprocating bearing), a more compact design has been achieved by arranging the motor shaft in parallel with the tool shaft.
  • Page 14 The pressing force of spring (B) is as low as 1.0 kg to 2.0 kg in comparison with the conventional mouth system. The Model DH 22PG is also suitable for drilling in upward direction.
  • Page 15 Inner cover Slip mechanism The slip mechanism in the Model DH 22PG 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 16: Changeover Between "Rotation Only" And "Rotation And Hammering

    4. Precautions for use of “Rotation only” (no hammering) function The Model DH 22PG is equipped with a change lever for changeover between “rotation only” and “rotation and hammering” functions. Be sure to set the change lever to “rotation only” for drilling into wood or metal materials or for driving screws by means of the optional chuck adapter or drill chuck.

  • Page 17: Tool Retainer Section

    Fig. 6 6. Tool retainer section The tool retainer is structured as shown in Fig. 7. The tip of the tool retainer is covered with the front cap (made of rubber) to prevent dust and chips from getting inside. The steel ball falls into the round groove of the bit to prevent the tool from coming off and the two key rails transmit the rotation torque.

  • Page 18: Dust Collector

    When drilling holes overhead, dust collector (B) (optional accessory) can be mounted on the Model DH 22PG 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. It is designed for use with drill bits with overall length of 166 mm, 160 mm and 110 mm, and cannot be used with any longer bits.

  • Page 19: Repair Guide

    1. Precautions in disassembly and reassembly The [Bold] numbers in the description below correspond to the item numbers in the Parts List and the exploded assembly diagram for the Model DH 22PG. Disassembly 1. Disassembly of the tool retainer Slide the Grip [3] fully in the arrow direction as shown in Fig.
  • Page 20 3. Removal of the Cylinder [19] and the Second Gear [17] (slip mechanism section) Remove the Machine Screw M4 x 5 [15] securing the Lever [14] to the Stopper [12] from the inside of the Gear Cover [7]. Pull out the Lever [14] from the Gear Cover [7]. Then the Stopper [12] can be removed. Push the tip of the Cylinder [19] to remove the Cylinder [19] from the Gear Cover [7].
  • Page 21 Fill 30 g of special grease in the Gear Cover [7] and 10 g in the groove of the Inner Cover Ass’y [33]. Apply Hitachi Motor Grease No. 29 to the Steel Ball D7.0 [18]. 2. Reassembly of the Cylinder [19] section Mount the O-ring (P-15) [22], Second Hammer [20], O-ring (B) [21] and Hammer Holder [23] in the Cylinder [19] as shown in Fig.
  • Page 22 5. Reassembly of the internal pressure adjustment mechanism As shown in Fig.13, push Felt Packing (A) [43], Valve [44] and Felt Packing (B) [45] in the Inner Cover Ass’y [33] as far as they will go in this order. Fig. 13 A - A Felt Packing (B) [45] Valve [44]...

  • Page 23: Tightening Torque

    Fig.15 Change lever pocket Notch Thrust Plate [28] Inner Cover Ass’y [33] 7. Tightening torque Tapping Screw D4 [8] [52] [69] [72] ----------------------- 1.47 – 2.45 N•m (15 – 25 kgf•cm) Machine Screw M4 x 5 [15]---------------------------------- 0.39 – 0.78 N•m (4 – 8 kgf•cm) 8.
  • Page 24 (2) Product without noise suppressor Fig. 17 Black or brown White Gray Brown Cord ass’y Blue White or blue Black Speed control SW Reversing SW -21-...

  • Page 25: Internal Wire Arrangement And Wiring Work

    9. Internal wire arrangement and wiring work A. Internal wire arrangement (1) Product with noise suppressor Brown (Choke coil) Black (Stator) Fig. 18 Choke Coil (A) Blue [61] Gray (Stator) Choke coil (A) Brown [59] White (Stator) White (Stator) Red (Stator) Blue (Choke coil) Noise Suppressor [67] White or blue...
  • Page 26 (2) Product without noise suppressor Fig. 19 Brown (CB) Black (Stator) Gray (Stator) White (Stator) White (Stator) Red (Stator) Blue (CB) White or blue Black or brown -23-...
  • Page 27 B. Additional wiring work General internal wiring can be accomplished by referring to paragraphs 8 and 9. 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 28: Insulation Tests

    10. Insulation tests On completion of disassembly and repair, measure the insulation resistance and conduct the dielectric strength test. Insulation resistance: 7 M or more with DC 500 V megohm tester Dielectric strength: AC 4,000 V/1 minute, with no abnormalities 220 V - 240 V (and 110 V for U.K.

  • Page 29: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow DH22PG Handle Cover Switch Cord Armor Cord Housing Stator Armature Ass’y O-ring (S-24) Ball Bearing (609DD) Ball Bearing (608VV) General Assembly Cylinder Second Hammer Front Cap Lever Second Gear O-ring (B) Grip O-ring (1AP-10)
  • Page 30 Hitachi Power Tools LIST NO. E497 ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2007 • • Model DH 22PG (E1)
  • Page 31 PARTS DH 22PG ITEM CODE NO. DESCRIPTION REMARKS USED 306-345 FRONT CAP 306-340 STOPPER RING 325-597 GRIP 327-879 BALL HOLDER 324-526 HOLDER PLATE 322-812 HOLDER SPRING 327-873 GEAR COVER 305-490 TAPPING SCREW (W/FLANGE) D4X30 (BLACK) NAME PLATE 965-469 RETAINING RING FOR D25 SHAFT...
  • Page 32 PARTS DH 22PG ITEM CODE NO. REMARKS DESCRIPTION USED 360-798F ARMATURE 240V 327-868 FAN GUIDE 981-824 HEX. HD. TAPPING SCREW D4X45 340-701C STATOR 110V-120V 340-701E STATOR 220V-230V 340-701F STATOR 240V 982-631 WASHER (A) 608-VVM BALL BEARING 608VVC2PS2L HITACHI LABEL 327-881...
  • Page 33 STANDARD ACCESSORIES DH 22PG ITEM CODE NO. DESCRIPTION REMARKS USED 327-883 CASE 324-548 SIDE HANDLE 303-709 DEPTH GAUGE 310-331 DEPTH GAUGE FOR USA, CAN OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 308-471 GREASE FOR HAMMER.HAMMER DRILL (70G) 980-927 GREASE FOR HAMMER.HAMMER DRILL (500G) 981-840 GREASE (A) FOR HAMMER.HAMMER DRILL (30G)
  • Page 34 OPTIONAL ACCESSORIES DH 22PG ITEM CODE NO. REMARKS DESCRIPTION USED 321-825 DRILL CHUCK AND ADAPTER SET INCLUD. 604, 642 306-369 DRILL BIT (SLENDER SHAFT) D3.4X90 306-368 DRILL BIT (SLENDER SHAFT) D3.5X90 306-370 ADAPTER FOR SLENDER SHAFT (SDS PLUS) 944-460 TAPER SHANK DRILL BIT D11X100 944-461 TAPER SHANK DRILL BIT D12.3X110...
  • Page 35 DH 22PG ITEM CODE NO. DESCRIPTION REMARKS USED --- 6 --- 6 -- 07 Printed in Japan (070604N)

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