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Hitachi DM 20V Technical Data And Service Manual

20 mm (3/4") masonry drill
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MODEL
DM 20V
Hitachi
Power Tools
D
TECHNICAL DATA
20 mm (3/4") MASONRY DRILL
AND
DM 20V
SERVICE MANUAL
LIST No. E109
Dec. 2005
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi DM 20V

  • Page 1 MODEL DM 20V Hitachi Power Tools TECHNICAL DATA 20 mm (3/4”) MASONRY DRILL DM 20V SERVICE MANUAL LIST No. E109 Dec. 2005 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 REMARK: 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: Model DM 20V Competitors Symbols Utilized Model Name Company Name...

  • Page 3: Table Of Contents

    8-2. Reassembly ..........................16 8-3. Wiring Diagram ..........................19 8-4. Internal Wire Arrangement and Wiring Work ................20 8-5. Insulation Tests ..........................22 8-6. No-Load Current Value ........................ 22 9. STANDARD REPAIR TIME (UNIT) SCHEDULES ............... 23 Assembly Diagram for DM 20V...

  • Page 4: Product Name

    1. PRODUCT NAME Hitachi 20 mm (3/4") Masonry Drill, Model DM 20V 2. MARKETING OBJECTIVE The new Model DM 20V has been developed as a low operating noise and low vibration model to reduce operators' fatigue. Features and benefits: Low operation vibration and low operation noise...

  • Page 5: Selling Point Descriptions

    Ratchet (A) (2) Fast drilling speed Thanks to the powerful motor (rated power consumption: 790 W), the Model DM 20V can drill at the class-top speed. Powerful motor also provides high performance for heavy-duty applications. (3) Easy-to-operate 2-finger sized trigger switch with speed control dial The pulling amount of the trigger can be adjusted on the dial.
  • Page 6 (1) Full load vibration Z axias (Material: Mortar, Drill bit: 8 mm dia.) HITACHI: DM 20V 10.3 HITACHI: DV 20VB2 11.2 13.1 (m/s 3 axias (Material: Mortar, Drill bit: 8 mm dia.) HITACHI: DM 20V 15.7 HITACHI: DV 20VB2 16.2 12.4...

  • Page 7: Specifications

    5. SPECIFICATIONS 5-1. Specifications Capacities Concrete Low speed: 20 mm (3/4") / High speed: 13 mm (1/2") Steel Low speed: 13 mm (1/2") / High speed: 8 mm (5/16") Wood Low speed: 40 mm (1-9/16") / High speed: 25 mm (1") Drill chuck Mount type: UNF 1/2"...

  • Page 8: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons Masonry drill Impact drill Product HITACHI Maker HITACHI (Reference) (Reference) Model DV 20VB2 DM 20V Concrete 20 (3/4") 20 (3/4") 20 (3/4") 20 (3/4") 20 (3/4") 20 (3/4") mm (in.) Steel 13 (1/2") Capacities 13 (1/2")

  • Page 9: Drilling Speed Comparisons

    1000 Test condition: Mortar panel compression: 24 N/mm HITACHI DV 20VB2 Pressing force: 150 N Reference HITACHI DM 20V Reference Drill diameter [mm] 1400 Test condition: HITACHI DV 20VB2 Mortar panel compression: 24 N/mm...

  • Page 10: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model DM 20V Masonry Drill by all of our customers, it is very important that at the time of sales 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 11 (2) High-speed/low-speed changeover Prior to changing speed, ensure that the switch is in the OFF position, and the drill has come to a complete stop. To change speed, rotate the gear shift dial as indicated by the arrow in Fig. 2. The numeral "1" Gear shift dial engraved on the drill body denotes low speed, the numeral "2"...
  • Page 12 141.6 N {14.4 kgf} at the maximum. Instruct the customers to use the side handle without fail and securely hold the Model DM 20V with both hands standing on a good foothold, not to be affected by the reaction force.

  • Page 13: Precautions In Disassembly And Reassembly

    8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY The numbers in the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram. 8-1. Disassembly 8-1-1. Motor section disassembly (1) Removal of the handle cover Loosen the Tapping Screws (W/Flange) D4 x 20 (Black) [56] and remove the Handle Cover [55]. (2) Removal of the carbon brushes With a small flat-blade screwdriver, slightly lift the Brush Holders [51].
  • Page 14 (4) Removal of the armature from the inner cover As illustrated in Fig. 7, support the Inner Cover [17] with a tubular jig, and push down on the top of the pinion of the Armature [37]. Push. Pinion Inner Cover [17] Armature [37] Fig.
  • Page 15 8-1-3. Removal of the drill chuck The Drill Chuck [2] is secured to the Spindle [3] with 1/2"-20 UNF (right hand) and Flat Hd. Screw (A) (Left Hand) M6 x 25 [1]. At first, open the chuck jaw as far as possible and loosen Flat Hd. Screw (A) (Left Hand) M6 x 25 [1] by turning it clockwise.
  • Page 16 8-1-4. Gear cover section disassembly (1) Removal of the spindle Remove the Retaining Ring For D35 Hole [4]. Support the tip of the Gear Cover [11] with a cylindrical jig of inside diameter 35 mm or more, and push the rear portion of the Spindle [3] lightly.
  • Page 17 (2) Removal of ratchet (B) Removal of the Retarining Ring for D35 Hole [4] As illustrated in Fig. 11, support the Gear Cover [11] with a cylindrical jig of outside diameter 24 mm, and push down on the top of the cylindrical jig, then Ratchet (B) [25] can be removed together with the Spring [26], Sleeve (A) [27], O-ring [28] and Sleeve (B) [29].
  • Page 18 (3) Removal of the shift lever Position the Shift Lever Ass'y [18] as shown in Fig. 12. Push both ends of the Retaining Ring (E-type) for D15 Shaft [24] with a pair of long-nose pliers until a clearance about 1 to 2 mm is made. Keeping the clearance, turn the Shift Lever Ass'y [18] by 180 degrees together with the Retaining Ring (E-type) for D15 Shaft [24].

  • Page 19: Reassembly

    8-2. Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse. However, special attention should be given to the following items. 8-2-1. Internal wire arrangement (1) Arrange the internal wires according to "8-4. Internal Wire Arrangement and Wiring Work". (2) Be careful not to catch the internal wires when mounting the handle cover.
  • Page 20 8-2-4. Reassembly of the gear cover section Figure 13 shows the assembly drawing. Reassemble the gear cover section according to the following figure. Second Pinion and Gear Set [13] Pin D5 x 68 [31] Washer (B) [12] Shift Arm [30] Shift Lever Ass'y [18] Spring (H) [22] Steel Ball D3.5 [23]...
  • Page 21 (With slip clutch) Second Pinion and Gear Set [13] Pin D5 x 68 [31] Washer (B) [12] Shift Arm [30] Shift Lever Ass'y [18] Spring (H) [22] Steel Ball D3.5 [23] Gear [32] Washer (B) [12] Retaining Ring Sleeve (B) [29] for D35 Hole [4] Sleeve (A) [27] O-ring [28]...

  • Page 22: Wiring Diagram

    8-3. Wiring Diagram Fig. 15 --- 19 ---...

  • Page 23: Internal Wire Arrangement And Wiring Work

    8-4. Internal Wire Arrangement and Wiring Work A. Internal wire arrangement Natural (Noise suppressor) CB terminal Carbon brush Black (Stator) Brown (Choke coil) Blue (Choke coil) White (Stator) Armature Switch Gray (Stator) Red (Stator) Noise suppressor Cord Fig. 16 --- 20 ---...
  • Page 24 B. Switch connection (1) Wiring of reversing switch Blue White (Choke coil/Lead wire) (Stator) Brown Black (Choke/Lead wire) (Stator) Fig. 17 (2) Wiring of speed control switch Black or brown White or blue (Cord) (Cord) (Stator) Gray (Stator) Noise suppressor Fig.

  • Page 25: Insulation Tests

    8-5. Insulation Tests On completion of reassembly after repair, measure the insulation resistance and conduct the dielectric strength test. Insulation resistance: 7 M Ω 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. products) AC 2,500 V/1 minute, with no abnormalities 110 V --- 127 V (except U.K.

  • Page 26: Standard Repair Time (Unit) Schedules

    9. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow DM 20V Handle Cover Switch Cord Armor Cord Housing Stator General Assembly Armature Inner Cover Ball Bearing Second Pinion (608DD) and Gear Set Ball Bearing Change Lever...
  • Page 27 Hitachi Power Tools LIST NO. E109 ELECTRIC TOOL PARTS LIST MASONRY DRILL 2005 • • Model DM 20V (E1)
  • Page 28 PARTS DM 20V ITEM CODE NO. DESCRIPTION REMARKS USED 995-344 FLAT HD. SCREW (A) (LEFT HAND) M6X25 1 EXCEPT FOR GBR 319-546 DRILL CHUCK 13VLRE-N (W/O CHUCK WRENCH) 316-280 DRILL CHUCK 13VLN (W/O CHUCK WRENCH) 1 FOR GBR 325-319 SPINDLE 939-556 RETAINING RING FOR D35 HOLE (10 PCS.)
  • Page 29 PARTS DM 20V ITEM CODE NO. REMARKS DESCRIPTION USED 937-631 CORD CLIP 984-750 TAPPING SCREW (W/FLANGE) D4X16 999-041 CARBON BRUSH (1 PAIR) 955-203 BRUSH HOLDER 321-634 CHOKE COIL (BLUE) 110V-240V 322-519 CHOKE COIL (BLUE) 110V 1 FOR GBR (110V) 322-517...

  • Page 30: Standard Accessories

    STANDARD ACCESSORIES DM 20V ITEM CODE NO. DESCRIPTION REMARKS USED 325-341 CASE 323-050 SIDE HANDLE 303-709 DEPTH GAUGE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 931-851 DRILL BIT (B) D6.5X100 931-852 DRILL BIT (B) D8.0X100 931-853 DRILL BIT (B) D9.5X120 931-854 DRILL BIT (B) D10.0X120...

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