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Hitachi DM 20V, Technical Data And Service Manual, Page: 3 / 31

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CONTENTS

1. PRODUCT NAME ...........................................................................................................................1

2. MARKETING OBJECTIVE .............................................................................................................1

3. APPLICATIONS ..............................................................................................................................1

4. SELLING POINTS ..........................................................................................................................1

4-1.  Selling Point Descriptions ............................................................................................................. 2

5. SPECIFICATIONS ..........................................................................................................................4

5-1. Specifications ................................................................................................................................. 4

6. COMPARISONS WITH SIMILAR PRODUCTS ..............................................................................5

6-1. Specification Comparisons ............................................................................................................ 5

6-2. Drilling Speed Comparisons .......................................................................................................... 6

7. PRECAUTIONS IN SALES PROMOTION .....................................................................................7

7-1. Handling Instructions ..................................................................................................................... 7

7-2. Precautions on Usage ................................................................................................................... 7

8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY .......................................................... 10

8-1. Disassembly ................................................................................................................................ 10

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

Summary of Contents for DM 20V

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL 20 mm 3 4 MASONRY DRILL DM 20V SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E109 Dec 2005 D MODEL DM 20V Hitachi Power Tools ...

Page 2: ...bol 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 Symbols Utilized Competitors Company Name Model Name BOSCH GSB20 2RE B MAKITA HP2051 C1 MAKITA HP2041 C2 METABO SBE750 H ...

Page 3: ...ion Comparisons 5 6 2 Drilling Speed Comparisons 6 7 PRECAUTIONS IN SALES PROMOTION 7 7 1 Handling Instructions 7 7 2 Precautions on Usage 7 8 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 10 8 1 Disassembly 10 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 D...

Page 4: ...tation and impacting function Drilling into concrete brick ceramic tile marble granite and other stone materials 2 Rotation only function Drilling into metal wood and plastics 4 SELLING POINTS Shortest chuck offset 23 5 mm 15 16 Slip clutch mechanism Only for specific destinations Soft grip handle for increased comfort Two finger sized trigger switch with speed control dial Push button type forwar...

Page 5: ...and the 2 finger sized trigger switch are easy to operate 4 Reliable and convenient push button type forward reverse changeover switch The Model DM 20V is equipped with the push button type forward reverse changeover switch that is more convenient and reliable than the lever type switch In addition this switch is properly shaped and located not to make the pushbutton an obstacle at drilling 5 Dura...

Page 6: ...2 H C1 B C2 5 2 15 7 16 2 12 4 6 7 17 3 5 0 10 m s2 15 20 HITACHI DM 20V HITACHI DV 20VB2 H C1 B C2 3 0 10 3 11 2 8 6 4 0 13 1 5 0 10 m s2 1 Full load vibration Z axias Material Mortar Drill bit 8 mm dia 1 3 axias Material Mortar Drill bit 8 mm dia 2 2 Full load sound pressure level Material Mortar Drill bit 8 mm dia 3 Drilling speed Material Mortar Drill dia 13 mm Pushing force 150 N ...

Page 7: ... input Cord No load speed Full load impact rate Full load output Weight Net 1 Gross Packaging Standard accessories Optional accessories AC single phase 50 60 Hz 110 V 7 6 A 230 V 3 6 A AC single phase commutator motor 2 core cabtire cord 2 5 m 8 3 ft Glassfiber reinforced polycarbonate elastomer Side handle 1 Depth gauge 1 Plastic carrying case 1 Aluminum alloy die casting Drill bit for concrete V...

Page 8: ...00 0 19 000 0 57 000 79 Cylindrical Aluminum C1 0 1 200 0 2 900 0 24 000 0 58 000 81 Cylindrical Aluminum C2 Reference 20 3 4 13 1 2 40 1 9 16 0 950 0 2 900 0 12 350 0 35 700 43 4 14 2 78 Two halves Plastic 0 1 100 0 3 000 0 17 600 0 48 000 87 Cylindrical Aluminum B Reference 20 3 4 13 1 2 40 1 9 16 20 3 4 13 1 2 40 1 9 16 650 800 790 120 V 8 3 A 720 120 V 6 6 A Overall length Chuck offset Weight ...

Page 9: ...nel compression 24 N mm2 Pressing force 300 N 1000 800 400 600 200 0 6 12 10 8 14 HITACHI DV 20VB2 B Reference C2 Reference HITACHI DM 20V C1 H Drill diameter mm Drilling speed mm min 1200 1400 Test condition Mortar panel compression 24 N mm2 Pressing force 150 N 1000 800 400 600 200 0 6 12 10 8 14 HITACHI DV 20VB2 B Reference C2 Reference HITACHI DM 20V C1 H Drill diameter mm Drilling speed mm mi...

Page 10: ...ring sales promotion To bore holes in metal wood and plastic shift the change lever to the left hand position as indicated by the mark The drill bit operates by rotational action only as in the case of a conventional elecric drill 7 2 Precautions on Usage 1 IMPACT to ROTATION changeover Shift the change lever between the right and left positions to switch easily between IMPACT rotation and impact ...

Page 11: ...UTION Always use the hammer drill with clockwise rotation when using it as an hammer drill L R R L Low speed NOTE If the L side of the pushing button is pressed for reverse bit rotation the stopper cannot be used Speed control dial Switch trigger Stopper Fig 3 Fig 4 4 Switch operation When the trigger switch is depressed the tool rotates When the trigger is released the tool stops The rotational s...

Page 12: ...d drill This can damage the drill 6 Slip clutch mechanism Depends on market The Model DM 20V is equipped with the slip clutch mechanism to avoid direct and strong reaction force caused by application of a sudden and heavy load by slipping the transmission portion between the motor and the drill bit CAUTION Turn off the switch immediately if the rotation of the drill bit is stopped by the slip clut...

Page 13: ...ushes With a small flat blade screwdriver slightly lift the Brush Holders 51 Then while pushing the Carbon Brushes 1 Pair 50 to the bottom of the brush holders gently pull out and disconnect the internal wire terminals See Figs 5 and 6 3 Removal of the gear cover from the housing Loosen the Tapping Screws D5 x 55 10 and separate the Gear Cover 11 from the Housing 44 Then remove the Inner Cover 17 ...

Page 14: ...ernal wires from the Switch 1P Pillar Type 46 To disconnect the internal wires from the switch insert a small flat blade screwdriver into the windows near the terminals and pull out the internal wires Remove the Hex Hd Tapping Screws D4 x 50 39 and tap the end surface of the Housing 44 slightly with a wooden hammer Then the stator can be removed from the housing Fig 7 8 1 2 Inner cover ass y disas...

Page 15: ...ill chuck until the wrench is at about a 30û angle to the bench top and strike the wrench sharply with a hammer so the drill chuck turns in the counterclockwise direction Fig 8 Pipe Hex bar wrench Fig 9 Turn it counterclockwise Vise Open end wrench b Hold the Spindle 3 with the open end wrench secured to the vise as shown in Fig 9 Mount the pipe to the hex bar wrench Turn the hex bar wrench counte...

Page 16: ...e 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 Then the spindle can be removed together with Oil Seal A 5 Distance Ring 6 Ball Bearing 6202DDCMPS2L 7 and Spring A 9 Fig 10 Spindle 3 Push Dia 35 mm Fig 10 ...

Page 17: ...ole 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 Sleeve B 29 Spring 26 Ratchet B 25 O ring 28 Push ...

Page 18: ...ss y 18 by 180 degrees together with the Retaining Ring E type for D15 Shaft 24 Insert a flat blade screwdriver into the clearance and pry the Retaining Ring E type for D15 Shaft 24 off upward CAUTION If the Retaining Ring E type for D15 Shaft 24 is pushed excessively the Shift Lever Ass y 18 cannot be turned due to a wide clearance Clearance Gear Cover 11 Shift Lever Ass y 18 Face the shift pin u...

Page 19: ...Gear Set 13 and the Gear 32 On the Spindle 3 Ground portion for fitting the Ball Bearing 6202DDCMPS2L 7 splined portion and hole of rear side On the Shift Lever Ass y 18 Outer circumference portion of the Shift Pin 20 the O ring S 22 19 On the Change Shaft 16 Outer circumference portion Lip portion of Oil Seal A 5 On the Inner Cover 17 Metal portion Inside of Gear Cover 11 5 g 8 2 3 Tightening tor...

Page 20: ... Ball Bearing 6202DDCMPS2L 7 Spindle 3 Retaining Ring for D35 Hole 4 CAUTION Be sure to replace Ratchet A 8 with a new one Never reuse Ratchet A 8 previously removed from the Spindle 3 If reused the tightening torque between Ratchet A 8 and the Spindle 3 will be far too low and the Spindle 3 may run idle in the IMPACT mode Mounting directions of the Shift Arm 30 and the Gear 32 are specified Mount...

Page 21: ...e Ratchet A 8 with a new one Never reuse Ratchet A 8 previously removed from the Spindle 3 If reused the tightening torque between Ratchet A 8 and the Spindle 3 will be far too low and the Spindle 4 may run idle in the IMPACT mode Mounting directions of the Shift Arm 30 and the Gear 32 are specified Mount these parts in the specified direction as shown in the above figure Retaining Ring for D35 Ho...

Page 22: ... 19 8 3 Wiring Diagram Fig 15 ...

Page 23: ...Black Stator Carbon brush Cord White Stator Switch Red Stator Brown Choke coil Gray Stator Noise suppressor 8 4 Internal Wire Arrangement and Wiring Work A Internal wire arrangement Armature CB terminal Blue Choke coil Fig 16 5 5 0 ...

Page 24: ... Wiring of reversing switch 2 Wiring of speed control switch White Stator Blue Choke coil Lead wire Black Stator Brown Choke Lead wire Gray Stator Red Stator Black or brown Cord White or blue Cord Noise suppressor Fig 17 Fig 18 ...

Page 25: ...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 products 8 6 No Load Current Value After no load operation for 30 minutes the no load current value should be as follows Voltage V Current A Max 1 6 230 3 5 110 ...

Page 26: ...g Stator Armature Ball Bearing 608DD Ball Bearing 698T1XZZ General Assembly DM 20V Drill Chuck Switch Cord Inner Cover Second Pinion and Gear Set Change Lever Change Cover Change Shaft Spindle Ball Bearing 6202DD Ratchet A Spring A Gear Cover Ratchet B Shift Lever Ass y Spring H Shift Arm Gear Spring Sleeve A O ring Sleeve B ...

Page 27: ...SONRY DRILL Model DM 20V 2005 12 15 E1 Hitachi Power Tools 1 2 3 4 5 6 7 8 10 11 14 15 16 17 21 22 23 20 19 24 30 31 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 501 502 503 2 18 32 9 12 13 12 25 26 27 28 29 4 ...

Page 28: ...20 INNER COVER 1 18 322 847 SHIFT LEVER ASS Y 1 INCLUD 19 21 19 306 353 O RING S 22 1 20 322 848 SHIFT PIN 1 21 SHIFT LEVER 1 22 981 328 SPRING H 1 23 319 535 STEEL BALL D3 5 10 PCS 1 24 323 048 RETAINING RING E TYPE FOR D15 SHAFT 1 25 325 331 RATCHET B 1 26 325 332 SPRING 1 27 325 333 SLEEVE A 1 28 884 909 O RING 1 29 325 334 SLEEVE B 1 30 322 849 SHIFT ARM 1 31 325 321 PIN D5X68 1 32 325 327 GEA...

Page 29: ...LUE 110V 1 FOR GBR 110V 53 322 517 CHOKE COIL BROWN 220V 240V 1 53 322 518 CHOKE COIL BROWN 110V 1 FOR GBR 110V 54 500 234Z CORD 1 CORD ARMOR D8 8 54 500 247Z CORD 1 CORD ARMOR D8 8 FOR FIN DEN SWE NOR 54 500 435Z CORD 1 CORD ARMOR D8 8 FOR GBR 230V 54 500 461Z CORD 1 CORD ARMOR D8 8 FOR GBR 110V 54 500 447Z CORD 1 CORD ARMOR D8 8 FOR SUI 55 324 554 HANDLE COVER 1 56 301 653 TAPPING SCREW W FLANGE...

Page 30: ...501 325 341 CASE 1 502 323 050 SIDE HANDLE 1 503 303 709 DEPTH GAUGE 1 601 931 851 DRILL BIT B D6 5X100 1 602 931 852 DRILL BIT B D8 0X100 1 603 931 853 DRILL BIT B D9 5X120 1 604 931 854 DRILL BIT B D10 0X120 1 605 971 704 DRILL BIT B D12 0X160 1 606 931 855 DRILL BIT B D13 0X160 1 607 931 776 DRILL BIT B D14 3X160 1 608 971 670 DRILL BIT B D16 0X160 1 609 931 856 DRILL BIT B D19 0X160 1 ...

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