WH 12DH WR 12DH - Tool Parts Direct
Contents
1. Bolt The following bolts were utilized Strength grade is read as follows z 9 Ordinary bolt strength grade 4 8 4 8 S Ph sient Don L Yield point or durable force 85 45 500 psi 0 Tensile strength of the bolt 56 900 psi Nut e Model WH 12DH kgf cm 5 16 x 1 3 6 kgf cm 8 8 x 1 3 6 M8 x 30 mm M 10 x 30 mm 1000 1000 98 N m 72 ft lbs 98 N m 72 ft lbs High strength bolt S 800 800 O 78 4 N m 58 ft lbs O 78 4 N m 58 ft lbs 2 High strength bolt 2 D 600 D 600 58 8 N m 43 ft lbs 58 8 N m 43 ft lbs 400 400 7 39 2 N m 29 ft lbs 39 2 N m 29 ft lbs Ordinary bolt 200 7 200 19 6 N m 14 ft Ibs Ordinary bol 19 6 N m 14 ft Ibs 0 0 1 2 3 0 1 2 3 Tightening time sec Tightening time sec steel plate thickness steel plate thickness t 2 3 8 10 mm t 2 3 8 10 mm kgf cm 15 32 x 1 3 4 M 12 x 45 mm 1200 117 6 N m 86 ft Ibs High strength bolt 1000 98 N m 72 ft Ibs 800 g 78 4 N m 58 ft lbs 600 58 8 N m 43 ft Ibs D 400 Ordinary bolt 39 2 N m 29 ft lbs 200 19 6 N m 14 ft lbs 0 0 1 2 3 Tightening time sec steel plate thickness t E 1 25 mm Fig 6 1 15 e Model WR 12DH kgf cm 5 16 x 1 3 6 kgf cm 8 8 x 1 3 6 M82. Anvil B 8 Washer D 2 29 6 Check whether the direction of rotation of Anvil B 8 or Anvil K Ass y lt 4 gt coincides with the directional markings on the push on side of the Pushing Button 31 lt 29 gt When the Pushing Button 31 lt 29 gt is turned to the R side the direction of rotation of Anvil B 8 or Anvil K Ass y lt 4 gt should be clockwise as viewed from behind 7 Lubrication a ATTOLUB MS No 2 e Cam groove of the Spindle 15 lt 13 gt e Cam groove of the Hammer 10 lt 7 gt e Sliding section of the Hammer and the Spindle 8 mm Diameter hole of Anvil B 8 or Anvil K Ass y 4 e Sliding section between Anvil B 8 or Anvil Ass y 4 and the metal e Two Steel Balls D5 556 9 lt 6 gt Pinion tooth flanks of the Motor 23 21 Tooth flanks of the Ring gear 18 lt 16 gt Twenty five Steel Balls 03 5 7 8 b HITACHI MOTOR GREASE No 29 for WH 12DH only e Steel Ball D3 5 7 e Sliding section of Anvil B 8 and the Guide Sleeve 4 8 Screw tightening torque e Tapping Screw with sp washer D4 x 30 ee 20 5 kgf cm 1 96 0 49 N m 1 44 0 36 ft lbs e Tapping Screw with flange DA x 20 enne 20 5 kgf cm 1 96 0 49 N m 1 44 0 36 ft lbs e S Tight Screw D3 5 x 6 SOURCE ROTEN es 15 20 kgf cm 1 96 2 61 N m 1 44 1 92 ft lbs e Machine Screw M3 x 5 EDIT CRUNCH yi 3 c 4 k
3. 0 20 40 60 80 100 120 pcs Number of screws driven per charge EB 12B battery Fig 8 2 Effects of low ambient temperatures The tightening torque required may be reduced at low ambient temperatures or under the influence of grease and different torque coefficients dependent on manufacturing and finishing processes and specified by bolt manufacturers 3 Different bolt diameter Differences in bolt diameter will cause variation of the required levels of tightening torque Generally speaking tightening torque is higher for large bolts 4 Different materials being tightened When a bolt is tightened into a soft material such as aluminum plastic wood etc the tightening torque is considerably less than when the bolt is tightened into a hard material such as steel 5 Different tightening conditions The tightening torque may vary in accordance with bolt torque coefficient dependent on manufacturing process and specified by bolt manufactures bolt grade and bolt length even though the dimensions of the bolts are the same Tightening torque may also vary depending on the surface finishing state of tightening materials steel aluminum etc and materials to be tightened In addition if there is seal packing clearance etc between tightening materials the tightening torque is decreased 22 6 Wear and looseness of the socket With extended use the hexagonal portion of the socket which is fitted t
4. strength grade 12 9 Steel plate Mild steel thickness 25 mm 1 Accessory tool Hexagon socket strength grade 12 9 Steel plate Mild steel thickness 25 mm 1 Accessory tool Hexagon socket 24s 7 3 2 Screw Diameter and Appropriate Tightening Torque Generally speaking the appropriate tightening torque for a screw can be determined by the strength grade of the screw and the material tightened Tables 1 and 2 and Fig 5 below list data relative to the strength grade of various screws and the appropriate tightening torque For further reference appropriate tightening torque is calculated with the following formula Study and use this formula for accurate selection of tightening torque T2kd p T Appropriate tightening torque d Nominal diameter for the screw mm p Recommended axial tightening force to be applied to the screw kgf p rated axial stress kgf cm x 0 8 x effective sectional area of the thread mm K Torque coefficient 0 17 e Strength grade and rated axial stress of threads Table 1 Strength grade 4 8 6 8 8 8 12 9 Rated axial stress kgf mm 29 1 43 7 58 2 95 Material Mild steel Alloy steel including Ni Mn Cr etc Heat treatment None Processed hard material e Diameter and effective sectional areas of threads Table 2 Kind of thread x pitch M5 0 8 mm M6 x 1mm 8 1 25
5. WH 12DH WR 12DH HITACHI POWER TOOLS CORDLESS IMPACT DRIVER WH 12DH TECHNICAL DATA CORDLESS IMPACT WRENCH AND WR 12DH SERVICE MANUAL WH 12DH WR 12DH LIST No F829 830 Mar 1999 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT 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 WH 12DH Competitor Symbol Utilized Company Name Model Name C MAKITA 6914D WR 12DH Competitor Symbol Utilized Company Name Model Name MAKITA 6911D CONTENTS Business Section Page 1 PRODUCT n mn mH HH EEE EE EE eme SEES SEES EEE EES 1 2 MARKETING OBJECTIVE ele eite e elus o e Ste a kya cek upaku da tebu ie et ern ta cte ea len uay due dte 1 3 APPLICATIONS OERIP SS DETTES BEDE Pe a On ees anu tuta uuu asao nuyu US 1 4 PRODUCT DESIGNATION IN MODEL a 1 5 SELLING POINTS vr c EP US Srey OS 0 2 5 1 I Selling Point Descriptions EAE Y VEEE NE EE P ENT E 3 6 SPECIFICATIONS OE OTENE EET OEEO AT ETELE TEETE TTILE AESTATE 6 6 1 Specifications 6 6 2 Optional Accessories bostes oae AEE do bue DUNS a 7 7
6. 33 1 5 16 Main body weight kg 1 73 3 8 Ibs 2 3 5 1 Ibs 1 94 4 3 Ibs No load sound pressure level dB A 69 65 72 Tool tip mounting system Pin O ring or plunger Pin O ring or plunger Variable speed switch with Variable speed switch with Variable speed switch with Type of switch forward reverse forward reverse forward reverse changeover lever changeover lever changeover lever Type of motor DC magnet DC magnet DC magnet Voltage V 12 12 12 Current A 17 16 17 Type EB 12B EB 12H EB 12B 1222 Battery Nominal capacity mAh EE BR 3268 2 000 2 000 Nominal voltage V 12 12 12 Ambient temperature C 5 40 5 40 Model UC 14YF or UC 14YF2 UC 12Y DC1201 Charger Power input capacity VA 44 51 Recharging voltage V 7 2 14 4 2 4 12 2 4 12 Standard accessories e Plastic tool case e Charger UC 14YF or UC 14YF2 e Plastic tool case e Charger UC 12Y e Plastic tool case e Charger DC1201 1 Max tightening torque is based on tightening an M14 9 16 bolt strength grade 12 9 for 3 sec with a hexagon socket 2 Main body weight does not include accessory tools hexagon bit etc 12 7 3 Tightening torque 7 3 1 Tightening Torque Characteristic comparisons The Model WH 12DH and WR 12DH provide greater tightening torque than that of the previous models thanks to the high power rare earth magnet motor and the higher moment of inertia of the hammer The tightenin
7. LONG 21MMX125L EXTENSION BAR ASS Y SQUARE 12 7MMX100L INCLUD 617 618 INCLUD 617 618 992 613 SOCKET ASS Y FOR DUCT 13MMX95L INCLUD 617 618 645 992 614 SOCKET FOR DUCT 13MMX52L 992 615 SOCKET ASS Y FOR DUCT 14MMX95L INCLUD 617 618 647 992 616 993 658 SOCKET FOR DUCT 14MMX52L SOCKET ASS Y FOR DUCT 12MMX95L INCLUD 617 618 649 993 659 SOCKET FOR DUCT 12MMX52L 992 616 SOCKET FOR DUCT 14MMX52L 307 780 HOOK FOR CORDLESS TOOLS 307 824 316 665 HOLSTER BATTERY EB 12H W ENGLISH N P EXCEPT NZL AUS USA CAN 309 922 GREASE FOR IMPACT DRIVER 500G Printed Japan 11 98 981130 N
8. Strong fastening torque 6 35 mm 1 4 Hex drive 176 mm 6 15 16 Replaceable carbon brushes 1 200 kgf cm 117 6 86 4 ft lbs 12 7 mm 1 2 Square drive 180 mm 7 1 8 Optional socket Variable speed reversible switch with electric brake WH 12DH Cordless Impact Driver Cordless Impact Wrench EB 12B 2 0 Ah EB 12H 2 2 Ah Battery WR 12DH for longer use per charge 5 1 Selling Point Descriptions 1 Faster tightening speed The Model WH 12DH provides faster driving speed than the previous model thanks to the high power rare earth magnet motor and the higher moment of inertia of the hammer The comparisons with the previous Model WH 12DC and maker C s model are shown below D Tightening time sec Wood screw 5 5 mm dia x 120 mm length hemlock spruce sec Model 5 10 15 20 HITACHI WH 12DH 12 3 sec HITACHI WH 12DG 17 0 sec C 112586 2 Tightening time sec Wood screw 4 2 dia x 90 mm length hemlock spruce sec Model 5 10 15 20 HITACHI WH 12DH 4 8 sec HITACHI WH 12DC 6 5 sec C 4 8 sec 3 Tightening time sec Wood screw 3 8 mm dia x 20 mm length lauan sec Model 0 2 0 4 0 6 0 8 1 HITACHI WH
9. 12DH 0 85 sec HITACHI WH 12DC 1 1 sec 10375 4 Tightening time sec Teks screw 4 dia x 13 mm length SPCC 1 6 t sec Model 1 2 3 4 HITACHI WH 12DH 2 3 sec HITACHI WH 12DC 2 6 sec C 2 5 sec 2 Compact WH 12DH C Grip perimeter L 176 mm 6 15 16 B Switch position Model WH 12DH WH 12DC WR 12DH WH 12D em 176 198 180 230 26 26 26 33 5 43 43 43 46 5 B Switch position mm 1 11 16 1 11 16 1 11 16 1 25 32 125 125 125 128 C Grip perimeter mm 4 29 32 4 29 32 4 29 32 5 1 32 1 7 1 7 1 7 2 3 Catalog weight g 3 7 Ibs 3 7 Ibs 3 7 1 5 5 1 Ibs Weight k 1 73 1 73 1 73 2 39 g g 3 81 Ibs 3 81 Ibs 3 81 Ibs 5 31 Ibs 3 Improved motor performance The Models WH 12DH and WR 12DH are compact and have high power thanks to the rare earth magnet motor Furthermore these models have better heat resistance because the built in fan enhances cooling efficiency Their motors have replaceable carbon brushes and the service life of the carbon brush has been extended by increasing its volume by about 30 compared to our previous model and making seven slots in a motor armature core 4 Construction of replaceable carbon brushes The carbon brush can be easily removed from the motor with a flat blade screwdriver as shown in Fig 2 and can also be easily and securely mounted to the motor by ha
10. 13 gt to compress the Spring 12 lt 10 gt On this condition mount the Stopper 14 lt 12 gt onto the spindle shaft and then release the hand press e Mount the Ring Gear 18 lt 16 gt the Ball Bearing 20 lt 18 gt the Inner Cover 21 lt 19 gt and the Damper 22 lt 20 gt to the above reassembly Furthermore mount the other mechanical parts and Anvil B 8 or Anvil K Ass y lt 4 gt then the Hammer Case 6 lt 2 gt When mounting Anvil B 8 use the J 296 anvil cap Fig 13 Note The oil seal may be turned inside out if the anvil cap is not used 4 Mounting the assembly from the Hammer Case 6 lt 2 gt to Inner Cover 21 lt 19 gt to the housing assembly Push the assembly from the Hammer Case 6 lt 2 gt to the Inner Cover 21 lt 19 gt into the housing assembly by turning them clockwise and counterclockwise Check that the Anvil can be easily turned If it cannot be turned check for correct mesh of the gears Secure the above assembly with the four Tapping Screws D4 x 30 5 lt 1 gt 5 Reassembly of the Guide Sleeve 4 for WH 12DH only Insert the Steel Ball D3 5 7 into the hole of the Anvil B 8 Mount the Guide Sleeve 4 the Guide Spring 3 and Washer D 2 in sequence Mount the Retaining Ring 1 into the groove of Anvil B using the J 295 jigs A and B for retaining ring as illustrated in Fig 14 J 296 anvil cap Retaining Ring 1 J 295 jig B for retaining ring
11. 27 Motor Pinion Fin Ass y 92 lt 30 gt FET Purple Black A Projection of forward reverse lever T ERE H El SR Flag terminal Machine screw 29 lt 27 gt M3 x 5 S Tight Screw 36 lt 34 gt D3 5 x 6 FO DC Speed Control Switch 30 lt 28 gt VA THO Fig 12 1 Internal wire black Internal wire purple Schematic diagram viewed from Fig 12 2 99 3 Reassembly of the Mechanical Parts a Put the Washer S 13 lt 11 gt onto the shaft of the Spindle 15 lt 13 gt and mount the Hammer 10 lt 7 gt containing the twenty five Steel Balls D3 5 7 lt 8 gt Washer J 11 lt 9 gt and the Spring 12 lt 10 gt to the Spindle 15 lt 13 gt b Align the top of the cam groove on the Spindle 15 lt 13 gt with the steel ball guide groove on the Hammer 10 lt 7 gt as illustrated in Fig 11 Press down either of the raised faces of the Hammer 10 lt 7 gt with a hand press to compress the Spring 12 lt 10 gt until the end surface of the Hammer contacts the flange of the Spindle 15 lt 13 gt c Insert the two Steel Balls D5 556 9 lt 6 gt into the steel ball guide groove Check that the Steel Balls are properly inserted in the cam groove Then release the hand press d Mount the hammer assembly onto the J 297 base for washer S With a hand press push down the top of the Spindle 15 lt
12. Battery from the main body before starting repair or maintenance work Because the tool is cordless if the battery is left in and the switch is activated inadvertently the motor will start rotating unexpectedly which could cause serious injury 10 1 Precautions in Disassembly and Reassembly The bold and lt bold gt numbers correspond to the item numbers in the Parts List and the exploded assembly diagram WH 12DH lt gt WR 12DH 10 1 1 Disassembly 1 Removal of the Hammer Case 6 lt 2 gt and the Inner Cover 21 lt 19 gt Remove the four Tapping Screws D4 x 30 5 lt 1 gt that connect the Hammer Case 6 lt 2 gt with the Housing A B Set 28 lt 26 gt Remove the Hammer Case 6 lt 2 gt the Inner Cover 21 lt 19 gt and the Damper 22 lt 20 gt together from the Housing A B Set 28 lt 26 gt 2 Removal of Housing B Remove the seven Tapping Screws D4 x 20 26 lt 24 gt from the main body to remove Housing B 3 Remove the DC Speed Control Switch 30 lt 28 gt the Fin Ass y 32 lt 30 gt the Motor 23 21 Grip F 33 31 and Grip R 37 lt 35 gt together Remove the Pushing Button 31 lt 29 gt and the Strap 35 lt 33 gt 4 Disassembly of the switch ass y Remove the two Machine Screws x 5 29 lt 27 gt that secure the flag terminal and then disconnect the internal wires purple and black of the Motor 23 lt 21 gt from the DC Speed Control Switch 30 lt
13. COMPARISONS WITH SIMILAR PRODUCTS pepe ors kq ua sya balas us T 11 7 1 Specification Comparisons Cordless Impact Driver 11 7 2 Specification Comparisons Cordless Impact Wrench SELE Ves Ped ses SEEST SES PEGES 12 7 3 Tightening torque SEES EET ESS ES SEE TEE 13 7 4 Number of Screws or Bolts Driven EEPE A eadera re v fte aha Qa ao 17 8 PRECAUTIONS IN SALES PROMOTION EOC PENSEI ER T e T Po eod e DD GO RN SN 19 8 1 Safety Instructions OD DAMM MU CD 19 8 2 Tightening Torque Inspection Prior to Operation 21 8 3 Tightening Torque Variation TEES TEETE AEETI ALETTA LLL LI LAT i i 21 8 4 Suggestions and precautions for the Efficient Use of the Charger 668 23 9 OTHER PRECAUTIONS EE EIER P FOET E E E E E EEIT eA e d sah fectus uuu wawakunatas 24 Service section 10 REPAIR GUIDE 25 10 1 Precautions in Disassembly and Reassembly PU E ER UE 25 10 2 Precautions in Disassembly and Reassembly of Battery Charger 68 30 11 STANDARD REPAIR TIME UNIT SCHEDULES 31 Appendix Assembly Diagram for WH 12DH nn 32 Assembly Diagram for WR 12DH 35 1 PRODUCT NAME Hitachi Cordless Impact Driver Model WH 12DH Hitachi Cordless Impact Wrench Model WR 12DH 2 MARKETING OBJECTIVE The current Hitachi cordless impact driver series has provided excellent workabilit
14. lbs 6 SPECIFICATIONS 6 1 Specifications Model Cordless Impact Driver Cordless Impact Wrench 12DH WR 12DH Capacity Small screw M4 8 5 32 5 16 Ordinary bolt M6 M14 1 4 9 16 Ordinary bolt M5 M12 3 16 15 32 High strength bolt M6 M10 1 4 3 8 Tightening torque 1 000 kgf cm 98 N m 72 ft lbs 1 200 kgf cm 117 6 N m 86 4 ft Ibs Tip condition 6 35 mm 1 4 Bit holder 12 7 mm 1 2 Square drive Type of motor Fan cooled rare earth magnet motor Enclosure Main body Polyamide resin Housing Aluminum alloy die casting Hammer case Storage battery ABS resign black Charger ABS resin black Type of switch Trigger switch with forward reverse changeover pushing button with brake Handle configuration T type No load rotational speed 0 2 200 min Impact rate 0 3 000 min Main bod 1 7 kg 3 7 Incl us Weight y g 3 7 Ibs Includes battery Battery 0 62 kg 1 4 Ibs Overall length x height 176 mm 6 15 16 x 245 mm 9 21 32 180 mm 7 1 8 x 245 mm 9 21 32 Center height 26 mm 1 1 64 Battery Type EB 12B Sealed cylindrical nickel cadmium batteries Nominal voltage DC 12V Nominal life Charging discharging approximately 1 000 cycles in case of Model UC 14YF or UC 14YF2 Nominal capacity 2 000 mAh Battery Type EB 12H Sea
15. period of time elapsed from the commencement of the screw tightening operation to the completion As it can be seen when the tightening time is prolonged the number of screws which can be tightened per charge is decreased Please note that the data below are intended for general reference only as the number of screws which can be tightened per charge will vary slightly depending on screw tightening conditions screw sizes ambient temperatures and the charging capacity of the battery 18 8 PRECAUTIONS IN SALES PROMOTION 8 1 Safety Instructions In the interest of promoting the safest and most efficient use of these tools by all 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 and Name Plate attached to each tool A Handling Instructions Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to give pertinent advice to the customer In particular they must have a thorough understanding of the precautions in the use of the cordless battery charger type electric power tools which are different from those of ordinary electric power tools 1 Before use ensure that the unit is fully charged New units are not fully charged Even if the units were fully charged
16. screwdriver 6 Spindle 15 lt 13 gt Push down 4l Spring 12 lt 10 gt pm Stopper 14 12 Hammer 10 7 Washer S 13 11 J 297 Base for washer S Mount the hammer assembly onto the J 297 base for washer S With a hand press push down the top of the Spindle 15 13 to compress the Spring 12 102 In this position remove the Stopper 14 12 with a Fig 10 flat blade screwdriver then release the hand press See Fig 10 26 Remove the hammer assembly from the J 297 base for washer S and support the end surface of the Spindle 15 lt 13 gt With a hand press push down either of the raised faces of the Hammer 10 lt 7 gt to compress the Spring 12 lt 10 gt In this position extract the two Steel Balls D5 556 9 lt 6 gt from the cam grooves of the Spindle 15 lt 13 gt and the Hammer 10 lt 7 gt with a small flat blade screwdriver or a similar tool Then slowly release the hand press and lift the Hammer 10 lt 7 gt and Washer S 13 lt 11 gt together to extract them from the Spindle 15 lt 13 gt The Spring 12 lt 10 gt can then be removed Raised faces of hammer Spindle 15 lt 13 gt Top of spindle cam Steel Ball 9 lt 6 gt Hammer 10 lt 7 gt Steel ball guide groove Fig 11 10 1 2 Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse However special atten
17. 16 173 MOTOR 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 316 180 BRUSH CAP 302 086 TAPPING SCREW W FLANGE D4X20 BLACK NAME PLATE 317 340 HOUSING A B SET 994 532 MACHINE SCREW W SP WASHER M3X5 316 783 DC SPEED CONTROL SWITCH 316 166 PUSHING BUTTON 316 179 FIN ASS Y 316 178 GRIP F HITACHI LABEL 306 952 STRAP 311 131 S TIGHT SCREW D3 5X6 316 177 GRIP R 310 378 BATTERY 12B W ENGLISH N P 310 452 BATTERY EB 12B W ENGLISH N P 310 453 BATTERY EB 12B W ENGLISH N P 316 665 BATTERY EB 12H W ENGLISH N P N WIN INCLUD 33 37 INCLUD 36 FOR NZL AUS FOR USA CAN Ll sq Ay Al lt lt Ny ALTERNATIVE PARTS 11 98 33 STANDARD ACCESSORIES WH 12DH CODE NO DESCRIPTION REMARKS CHARGER MODEL UC 14YF DEPENDING ON ORDER SPEC CHARGER MODEL UC 14YF2 DEPENDING ON ORDER SPEC 306 306 OPTIONAL ACCESSORIES CODE NO DESCRIPTION REMARKS 992 671 DRIVER BIT B NO 2 50L 992 672 DRIVER BIT B NO 3 50L 996 177 NON MAGNETIC HEX SOCKET 8 65L 985 329 NON MAGNETIC HEX SOCKET 10MM 65L 996 178 NON MAGNETIC HEX SOCKET 12MM 65L 996 179 NON MAGNETIC HEX SOCKET 13MM 65L
18. 2 955229 A EG No 2 70 2 3 4 955654 E IL NM az Plus hds 45 1 25 32 955230 i eo driver bit No 3 70 2 3 4 955655 e Extension bar Overall length 100 mm 3 15 16 e Universal joint Code No 992610 e Socket ass y for duct e EW 14R corner attachment Code No 9329 9001 Code No 873633 Hexagonal two side width of applicable bolts Code No 12 15 32 993658 13 1 2 992613 14 9 16 992615 3 Optional accessories for the Models WH 12DH and WR 12DH e Holster Code No 307824 Use the holster to hold the unit during its operation Carefully read the warnings attached to the holster for safe use e Hook Code No 308090 Use the hook to hold the unit during its operation Carefully read the instructions that come with the hook to learn how to use it ajs 7 COMPARISONS WITH SIMILAR PRODUCTS 7 1 Specification Comparisons Cordless Impact Driver HITACHI WH 12DH WH 12DC x M4 M8 M4 M8 M4 M8 Small screw 5 32 5 16 5 32 5 16 5 32 5 16 2 Capacity Ordinary bolt ea 3 16 15 32 3 16 15 32 3 16 15 32 High strength bolt uie 3 s n ips ui 3 16 3 8 3 16 3 8 3 16 3 8 o k Max tightening torque kgfcm 98 ore ft lbs 88 2 aes
19. 2 F the thermostat will not function properly and the storage battery may be over charged At temperatures over 40 104 F the storage battery cannot be sufficiently charged The optimum temperature range is 20 C 25 C 68 F 77 F 7 The battery charger should not be used continuously At high ambient temperatures if over three storage batteries are charged in succession the temperature of the coils on the transformer will rise and there is a chance that the temperature fuse inserted in the interior of the transformer will inadvertently melt After charging one battery please charge the next battery after about a fifteen minute interval 8 The charger case is equipped with air vents to protect the internal electronic components from overheating Caution the customer not to allow foreign materials such as metallic or flammable objects to be dropped or inserted into the air vents This could cause electrical shock fire or other serious hazards 19 9 Do not attempt to disassemble the storage battery or the charger Special devices such as a thermostat are built into the storage battery and charger to permit rapid charging Incorrect parts replacement and or wiring will cause malfunctions which could result in fire or other hazards Instruct the customer to bring these units to an authorized service center in the event repair or replacement is necessary 10 Disposal of the Type EB 12B or EB 12H Storage B
20. 20 Jemm 955138 5 16 W 2 16 15 32 2 3 64 25 32 1 11 32 25 32 M8 _ 13 52 20 34 215 13 mm 395199 5 16 29 B 2 3 64 25 32 1 11 32 53 64 _ _ 14 52 20 34 22 14mm 955140 3 8 9 16 B 2 3 64 25 32 1 11 32 7 8 M10 M12 17 52 24 34 25 3 8 15 82 W 3 8 21 32 2 3 64 15 16 1 11 32 1 M10 M12 Qu 75 24 57 25 17mm 955149 15 529 W 3 8 21 32 B 1 2 15 16 15 16 2 14 3 12 7 mm Long M12 M14 19 52 24 34 28 1 2 socket 19 mm 955142 15 32 W 7 16 23 32 2 3 64 15 16 1 11 32 1 3 32 M12 M14 19 75 24 57 28 19 mm 955150 kasaz 9 16 W 7 16 23 32 B 15 16 15 16 2 1 4 1 3 32 21 52 24 34 31 21mm 955143 12 5364 D 2 3 64 15 16 1 11 32 1 7 32 Ta 75 24 57 31 21 955151 W D 1 2 15 16 15 16 2 1 4 1 7 32 21 125 24 107 31 21 991480 W172 53 64 D 2 15 16 15 16 4 7 32 1 7 32 12 M14 M16 22 52 24 34 325 22 mm 955144 15 329 9 16 5 8 7 8 D 2 3 64 15 16 1 11 32 1 9 32 e Bit adaptor Code 991476 Overall length 6 35 mm 1 4 45 mm 1 25 32 12 7 mm 1 2 Part name mm 9 Code No Plus hds _ FAN Plus nds 45 1 25 3
21. 28 gt Remove the S Tight Screw D3 5 x 6 36 34 to remove the Fin Ass y 32 30 from the FET of the DC Speed Control Switch Note Do not disconnect the three FET internal wires soldered to the DC Speed Control Switch 5 Removal of the Guide Sleeve 4 for WH 12DH only By following the procedure shown in Figs 9 1 to 9 4 you can remove the Retaining Ring 1 Washer D 2 the Guide Spring 3 and the Guide Sleeve 4 in this order Be sure not to lose the Steel Ball D3 5 7 in Anvil B 8 25 Small flat blade Anvil 8 screwdriver Retaining Ring 1 Washer D 2 Fig 9 1 Hold the body and adjust gap of the retaining ring to groove of the anvil B then insert a small flat blade screwdriver into the groove at an angle Fig 9 2 Press down the washer D with the screwdriver Fig 9 3 Slide the screwdriver under one side of the gap of the retaining ring AES v d d aa Fig 9 4 Slowly raise the retaining ring using the end face of the guide sleeve as a fulcrum Then slowly raise the other side of the retaining ring with the screwdriver until it is free The Guide Sleeve 4 can now be removed Avoid quickly raising the retaining ring or it may fly out forcefully The retaining ring can also be easily removed by widening the gap of the retaining ring with the jig for retaining ring and slowly raising the retaining ring with a small flat blade
22. 476 BIT ADAPTER ASS Y 944 291 HEX SOCKET ASS Y 10MMX40L 873 632 HEX SOCKET ASS Y 12MMX40L 873 539 HEX SOCKET ASS Y 13MMX40L 873 540 HEX SOCKET ASS Y 14MMX40L INCLUD 617 618 873 536 HEX SOCKET ASS Y 17MMX32L INCLUD 617 618 ALTERNATIVE PARTS 11 98 INCLUD 617 618 INCLUD 617 618 INCLUD 617 618 INCLUD 617 618 INCLUD 617 618 INCLUD 617 618 OPTIONAL ACCESSORIES CODE NO DESCRIPTION REMARKS WR 12DH 873 624 HEX SOCKET ASS Y 19MMX34L INCLUD 617 618 873 626 HEX SOCKET ASS Y 21MMX36L INCLUD 617 618 873 627 HEX SOCKET ASS Y 22MMX40L INCLUD 617 618 986 058 HEX SOCKET FOR PLASTIC CONE 12MMX70L INCLUD 617 618 955 151 955 138 HEX SOCKET ASS Y LONG 21MMX75L SOCKET ASS Y LONG 12MMX52L INCLUD 617 618 INCLUD 617 618 955 139 SOCKET ASS Y LONG 13MMX52L INCLUD 617 618 955 140 SOCKET ASS Y LONG 14 521 INCLUD 617 618 955 141 SOCKET ASS Y LONG 17MMX52L INCLUD 617 618 955 142 955 149 SOCKET ASS Y LONG 19MMX52L SOCKET ASS Y LONG 17MMX75L INCLUD 617 618 INCLUD 617 618 955 150 SOCKET ASS Y LONG 19MMX75L INCLUD 617 618 955 143 SOCKET ASS Y LONG 21MMX52L INCLUD 617 618 955 144 SOCKET ASS Y LONG 22MMX52L INCLUD 617 618 991 480 873 633 SOCKET ASS Y
23. 996 180 NON MAGNETIC HEX SOCKET 14MM 65L 996 181 NON MAGNETIC HEX SOCKET 16 651 996 182 NON MAGNETIC HEX SOCKET 17MM 65L 996 197 HEX SOCKET LONG 21MMX166L 996 195 DRILL CHUCK AND ADAPTER SET INCLUD 612 613 930 119 CHUCK WRENCH 6 5G 307 543 CHUCK ADAPTER 307 824 HOLSTER 308 090 HOOK FOR CORDLESS TOOLS 316 665 BATTERY EB 12H W ENGLISH N P EXCEPT FOR NZL AUS USA CAN 309 922 GREASE FOR IMPACT DRIVER 500G Printed in Japan 11 98 ALTERNATIVE PARTS 981130 N 34 Assembly Diagram for WR 12DH 35 PARTS WR 12DH CODE NO DESCRIPTION REMARKS 307 851 TAPPING SCREW W SP WASHER D4X30 BLACK 317 343 HAMMER CASE 985 209 PIN RETAINER 317 342 ANVIL K ASS Y INCLUD 3 5 985 208 PLUNGER 959 154 STEEL BALL 05 556 10 PCS 316 168 HAMMER 315 980 STEEL BALL 03 5 315 978 WASHER J 316 170 SPRING 316 172 WASHER S 316 171 STOPPER 316 169 SPINDLE 316 313 IDLE GEAR 991 449 NEEDLE ROLLER 302 337 RING GEAR 991 455 WASHER C 600 1VV BALL BEARING 6001VVCMPS2L 316 167 INNER COVER 310 319 DAMPER 316 173 MOTOR 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 316 180 BRUSH CAP 302 086 TAPPING SCREW W FLANGE D4X20 BLACK NAME PLATE 317 340 HOUSING A B SET 994 532 MACHINE SCREW W SP WASHER M3X5 316 783 DC SPEED CONTROL SWITC
24. Charger UC 12Y e Plastic tool case e Charger DC1411 in the case of EB9 type battery 1 n the case of tapping screws and wood screws a minimum of 1 8 is possible Max tightening torque is based on tightening an M12 5 32 bolt strength grade 12 9 for 3 sec with a hexagon socket 3 Main body weight does not include accessory tools hexagon bit etc ed x 7 2 Specification Comparisons Cordless Impact Wrench HITACHI Item WR 12DH WH 12D T M6 M14 M6 M14 M8 M14 Ordinary bolt 1 4 9 16 1 4 9 16 5 16 9 16 S M6 M10 M6 M12 M6 M 12 8 High strength bolt 1 4 3 8 1 4 15 32 1 4 15 32 o 1 1 200 1 200 1 200 Max tightening torque kgfcm 447 6 86 4 ft lbs 117 6 Nm 86 4 ft lbs 117 6 N m 86 4 ft lbs 3 No load rotation speed min 0 2 200 0 1 500 0 1 800 8 Impact rate min 0 3 000 0 2 300 0 2 500 Main body weight kg 1 7 3 7 1 5 2 3 5 1 Ibs 1 8 3 9 Ibs Max tightening torque kgtom 127 4 eae ft Ibs 117 6 ices ft lbs 124 5 Han 4 ft lbs Y No load rotation speed min 0 2 180 0 1 550 0 1 990 Impact rate min 0 2 900 0 2 300 0 2 500 Overall length x height mm E opio 230 x 258 9 x 10 Gud 2 Center height mm 26 1 1 64 33 5 1 5 16
25. H 316 166 PUSHING BUTTON 316 179 FIN ASS Y 316 178 GRIP F HITACHI LABEL 306 952 STRAP 311 131 S TIGHT SCREW D3 5X6 316 177 GRIP R 310 378 BATTERY 12B W ENGLISH N P 310 452 BATTERY EB 12B W ENGLISH N P 310 453 BATTERY EB 12B W ENGLISH N P 316 665 BATTERY EB 12H W ENGLISH N P N ON S WIN INCLUD 31 35 INCLUD 34 FOR NZL AUS FOR USA CAN L q S AS 11 98 ALTERNATIVE PARTS 36 STANDARD ACCESSORIES WR 12DH CODE NO DESCRIPTION REMARKS CHARGER MODEL UC 14YF DEPENDING ON ORDER SPEC CHARGER MODEL UC 14YF2 DEPENDING ON ORDER SPEC 306 306 OPTIONAL ACCESSORIES CODE NO DESCRIPTION REMARKS CORNER ATTACHMENT ASS Y INCLUD 602 618 955 300 HOUSING 955 301 METAL 955 302 SPINDLE HITACHI LABEL 955 303 BEARING RACE 955 304 NEEDLE THRUST BEARING NTA 1413 955 305 COVER 955 306 NEEDLE BEARING NTN BK1012 948 227 RETAINING RING FOR D47 HOLE 955 307 PINION 955 308 SLEEVE 955 309 WASHER 955 310 SOCKET COVER 955 311 SOCKET 303 247 SEAL LOCK HEX SOCKET HD BOLT M5X25 873 537 SOCKET PIN 873 187 O RING J1SW1516 991 481 FORM TIE SOCKET ASS Y 10MMX95L 992 610 UNIVERSAL JOINT ASS Y 955 153 UNIVERSAL JOINT PIN 991
26. at the factory long periods without use such as during shipping cause the storage battery to lose its charge Customers must be instructed to fully charge the unit prior to use 2 When charging storage batteries use only the exclusive Model UC 14YF or UC 14YF2 Charger provided with the tool Because of the designed rapid charging feature about one hour use of other battery chargers is hazardous 3 Follow prescribed steps in using the charger First connect the EB 12 Storage Battery to the Model UC 14YF or UC 14YF2 Charger then plug the charger into an AC outlet ensuring that the voltage matches that indicated on the unit If this order is reversed the charger may not function properly 4 Ensure the power source voltage is the same as that indicated on the Name Plate of the charger Use of any other power source DC outlet fuel powered generator etc will cause the charger to overheat and burn out 5 Do not use any voltage increasing equipment transformer etc between the power source and the charger Ifthe charger is used with voltage over and above that indicated on the unit it will not function properly 6 Conduct battery charging at an ambient temperature range of 0 40 C 32 F 104 F Special temperature sensitive devices are employed in the charger to permit rapid charging Ensure that customers are instructed to use the charger at the indicated ambient temperature range At temperatures under 0 C 3
27. attery Ensure that all customers understand that Type EB 12B or EB 12H Storage Batteries should be turned into any Hitachi power tool sales outlet or authorized service center when they are no longer capable of being recharged or repaired If thrown into a fire the batteries may explode or if discarded indiscriminately leakage of the cadmium compound contained in the battery may cause environmental pollution B Caution Plates 1 The following precautions are listed on the Name Plate attached to the main body of each tool For Europe CAUTION e Read thoroughly HANDLING INSTRUCTIONS before use For Germany Switzerland and Austria ACHTUNG Lesen Sie die Bedienungsanleitung sorgf ltig For France TRES IMPORTANT e Lire avec attention la notice d utilisation For the U S A excludes French or Canada Warning To reduce the risk of injury user must read and understand Instruction Manual AVERTISSEMENT e Afin de r duire le risque de blessures l utilisateur doit lire et bien comprendre le mode d emploi M 20 2 The following cautions are listed on the Name Plate attached to each Type EB 12B or EB 12H Storage battery For Europe CAUTION Read thoroughly HANDLING INSTRUCTIONS before use Do not disassemble nor throw into fire For the U S A CAUTION For safe operation see Instruction Manual 3 The following caution is listed on the Name Plate attached to th
28. charging Blinks 0 5 sec ON 0 5 sec OFF mm Red pilot lamp During charging Lit Stays ON constantly remains lit of flashes Charging completed Blinks 0 5 sec ON 0 5 sec OFF H mm mm Charging not 0 1 sec ON 0 1 sec OFF Storage battery or charger Green pilot lamp is lit temperature possible Flickers is faulty High battery 5 Charging possible Lit tays Constant y because storage battery temperature is too high 6 2 Optional Accessories 1 Optional accessories for the Model WH 12DH e Plus driver bit Bit No Code No No 2 992671 50 mm 2 No 3 992672 e Hexagon socket Stamped figures B L Part Name Stamped figures Code No mm mm 5 mm Hexagon socket 8 65 2 9 16 8 5 16 996177 6 mm Hexagon socket 10 65 2 9 16 10 3 8 985329 5 16 Hexagon socket 12 65 2 9 16 12 15 32 996178 8 mm Hexagon socket 13 65 2 9 16 3 1 2 996179 10 mm Hexagon socket small type 14 5 2 9 16 4 9 16 996180 10 mm Hexagon socket 16 5 2 9 16 6 5 8 996181 10 mm Hexagon socket 17 5 2 9 16 7 21 32 996182 1 2 Hexagon long socket 21 166 6 17 32 1 53 64 996197 e Woodworking drill bit Code No 959183 S SS D 83 mm 3 17 64 14 mm dia 85 64 e Drill chuck adaptor set Code No 996195 The drill chuck adaptor set permits mounting o
29. e Model UC 14YF or UC 14YF2 Charger For the U S A CAUTION For safe operation see Instruction Manual e Charger HITACHI rechargeable batteries Type EB 7 EB 9 EB 12 and EB 14 series Other types of batteries may burst causing personal injury and damage Charge between 32 and 104 F Indoor use only Replace defective cord immediately 8 2 Tightening Torque Inspection Prior to Operation As described and shown in Para 7 3 3 the output tightening torque of which the Models WH 12DH and WR 12DH are capable in excess of the rated tightening torque of certain bolts and screws Accordingly if the tightening time is prolonged for such bolts and screws it could cause damage to their threads or in the worst case cause them to be sheared off This phenomenon is common to all existing impact drivers Particularly when tightening M6 1 4 or smaller screws tightening time must be kept extremely short 0 5 seconds or less The customer should be advised to carry out several screw tightening operations and adjust the tightening time as necessary by measuring the tightening torque with an appropriate torque wrench or driver before commencing continuous operation 8 3 Tightening Torque Variation The tightening torque of the cordless impact driver or wrench may vary slightly in accordance with the factors described below Salespersons are requested to advise the customer to confirm that appropriate tightening torque is obtai
30. f various types of locally available drill bits for a variety of drilling operations 2 Optional accessories for the Model WR 12DH e Each dimension and applicable bolt for each hexagon socket Shape C 1 Shape B Square Nominal diameter of applicable bolts Dihedral Socket primary dimensions diris CodeNo Iso ISO ISO Inch width Shape mm Sq high strength ordinary small type screw H mm L Li Di u 1 4 8 1 98 Pate 2382 i ES ste B bna 5 Temm 873539 51167 E we B 35 T 12 7 Hexagon 14 mm 873540 7 7 3 8 B 1 818 112827 a 1 2 k ee SST mm sas 387 15 827 W 3 8 21 327 C ada 5767 01 37827 TIom deest s 15 327 W7 16 gos 119 927 11 32 1 3 32 21 873626 7 E Mu 597647 D duo ae aie 22 mm 873627 15 32 916 5 ve 1 9 6 916 138 e Each dimension and applicable bolt for each long socket Shape B yi NY 5 nec Nominal diameter of applicable bolts Dihedral Socket primary dimensions mm dimension Part Name No ISO ISO ISO Inch width Shape Sq tigh strength ordinary small type screw H mm L Li L2 Di _ M8 12 52 20 34
31. ft lbs 98 Rae ft lbs 8 No load rotation speed min 0 2 200 1 700 0 2 000 0 2 200 Q Impact rate min 0 3 000 2 700 0 2 900 0 3 000 Main body weight kg E 4 s me 1 7 3 7 Ibs 1 7 3 7 Ibs Max tightening torque kgtcm 860 SCAN DD ds 91 e ft lbs 98 ee ft lbs FA No load rotation speed min 0 2 180 1 680 0 2 010 0 2 160 3 Impact rate min 0 2 900 2 700 0 2 900 0 2 860 vo Overalllengthst height mm 9 21 32 S 9 1 8 2 Center height mm 26 1 1 64 26 1 1 64 26 1 1 64 Main body weight kg 1 73 3 8 Ibs 1 73 3 8 Ibs 1 73 3 8 Ibs No load sound pressure level dB A 69 69 69 Tool tip mounting system Driver chuck Driver chuck Driver chuck Variable speed switch with Variable speed switch with Variable speed switch with Type of switch forward reverse forward reverse forward reverse changeover lever changeover lever changeover lever Type of motor DC magnet DC magnet DC magnet Voltage V 12 9 6 12 12 Current A 17 13 17 17 Type EB 12B EB 12H EB 12 1222 Battery Nominal capacity mAh E 1 250 1 200 2 000 Nominal voltage V 12 9 6 12 12 Ambient temperature 0 40 5 40 m Model UC 14YF or UC 14YF2 UC 12Y DC1411 Charger Power input capacity VA 44 51 Recharging voltage V 7 2 14 4 2 4 12 7 2 14 4 Standard accessories e Plastic tool case e Charger UC 14YF or UC 14YF2 e Plastic tool case e
32. g torque does not drop even when loosening bolts because the motor runs at the same torque and speed in both the forward and reverse directions Tightening torque comparisons of Models WH 12DH and WR 12DH with previous models are shown in Figs 4 1 and 4 2 It should be noted that M12 15 32 and M14 9 16 strength grade 12 9 high strength bolts were utilized in the tests to ensure that the bolts were not stripped or distorted even though such bolts are actually beyond the recommended maximum capacity of these models Accordingly the data in the figures below are intended for reference purposes only Impact Driver Impact Wrench kgf cm kgf cm 1400 1400 Fa 100 ft lbs HITACHI 100 ft lbs HITACHI WH 12DH WH 12 1200 1200 117 6 N m 117 6 N m 86 ft lbs 86 ft lbs C forward amp 1000 Tightening torque lt 1000 5 98N m in reverse rotation 5 98 N m g 72 ft lbs is about 87 of 72 ft lbs 2 that in forward 2 800 rotation 2 800 o 78 4 78 4 N m 58 ft Ibs HITACHI 5 58 ft Ibs 600 WH 12DC 600 58 8 N m 58 8 N m 43 ft lbs 43 ft lbs 400 400 39 2 N m 39 2 N m 29 ft lbs 29 ft lbs 200 200 19 6 N m 19 6 N m 14 ft lbs 14 ft lbs 0 1 2 3 sec 0 1 2 3 sec Tightening time Tightening time Fig 4 1 Fig 4 2 Test conditions Bolt M12 x 45 mm 15 32 x 1 25 32 Bolt M14 x 50 mm 9 16 x 2
33. gf cm 0 294 gt 0 392 N m 0 22 xt 0 29 ft lbs 10 2 Precautions in Disassembly and Reassembly of Battery Charger Refer to the Technical Data and Service Manual for precautions in disassembly and reassembly of the Model UC 14YF or UC 14YF2 Battery Charger 30 11 STANDARD REPAIR TIME UNIT SCHEDULES Variable i MODEL 10 20 30 40 50 60 min Fixed Work Flow WH 12DH WR 12DH i Handle Cover Switch Housing Terminal Piece Inner Cover Motor O Ring Rubber Ring General Assembly Hammer Case Steel Ball Fixed Cost Washer Hammer Ass y Handle Cover Anvil Spring Sheet Ring Gear Spring Switch 0 min Terminal Piece Others 20 min Spindle Idle Gear Needle Roller Ball Bearing 6001 31 Assembly Diagram for WH 12DH 32 PARTS WH 12DH CODE NO DESCRIPTION REMARKS 315 984 RETAINING RING 315 983 WASHER D 315 982 GUIDE SPRING 315 981 GUIDE SLEEVE 307 851 TAPPING SCREW W SP WASHER D4X30 BLACK 317 339 HAMMER CASE 315 980 STEEL BALL 03 5 317 338 ANVIL 959 154 STEEL BALL 05 556 10 316 168 315 978 WASHER J 316 170 SPRING 316 172 WASHER 316 171 STOPPER 316 169 SPINDLE 316 313 IDLE GEAR 991 449 NEEDLE ROLLER 302 337 RING GEAR 991 455 WASHER C 600 IVV BALL BEARING 6001VVCMPS2L 316 167 INNER COVER 310 319 DAMPER 3
34. ilities air conditioning duct assembly etc sanitary fixtures and various other facilities e Service industry General repair work installation of advertising aids automobile repair assembly of garages and carports storage sheds etc e Various other assembly construction or repair facilities 4 PRODUCT DESIGNATION IN MODEL NAME To differentiate impact wrenches clearly from impact drivers the WH formerly used for both impact drivers and impact wrenches will be WR for impact wrenches from now on 1 Cordless impact driver 1 Type 2 Capacity 3 Essential division 4 Optional division WH 12 D H Impact driving Ordinary bolt M12 Cordless Order of release Wrenching Hammer 2 Cordless impact wrench 1 Type 2 Capacity 3 Essential division 4 Optional division WR 12 D H Impact driving High strength bolt M12 Cordless Order of release Wrenching Revolving bolt 5 SELLING POINTS 26 mm 1 1 64 Compact and well balanced body for less fatigue Higher rotation speed min and higher blows min for high power and faster fastening Improved motor performance Replaceable carbon brushes for longer motor life Fan cooled rare earth magnet motor Generates the same high torque at both forward amp reverse modes Rare earth magnet motor Strong fastening torque 1 000 kgf cm 98 Nm 72 ft lbs center height Compact body and lower Rare earth magnet motor
35. led cylindrical nickel metal hydride batteries Nominal voltage DC 12V Nominal life Charging discharging approximately 500 cycles in case of Model UC 14YF2 Nominal capacity 2 200 mAh Charger Model UC 14YF or UC 14YF2 Charger power source single phase AC 50 60 Hz Voltage Depending on the order specification Power input 44 W Charging system Constant current charge with full wave phase control Overcharge protection system 1 Battery voltage detection A V system 2 Battery surface temperature detection thermostat or thermistor 3 120 minute timer Output voltage 7 2 V 14 4 V Output current 1 9 A Charging time Approx 60 minutes for B type storage battery at 20 C Approx 70 minutes for H type storage battery at 20 C Product weight 1 3 kg Operable ambient temperature range 0 C 40 G The maximum allowable temperature of the EB12B type battery is 60 C and the EB 12H type battery is 45 C when recharging with the charger Model UC 14YF2 1 In the case of tapping screws and wood screws a minimum of 1 8 is possible This torque is based on tightening an M12 15 32 bolt strength grade 12 9 for 3 sec with a hexagonal socket 73 This torque is based on tightening an M14 9 16 bolt strength grade 12 9 for 3 sec with a hexagonal socket 4 Main body does not include accessory tools hexagonal bit etc Pilot lamp indications Model UC 14YF UC 14YF2 Prior to
36. mm M10 1 5 12 1 75 mm M14 x 2 mm neon eak pitch 3 16 1 4 5 16 3 18 15 32 9 16 14 2 20 1 36 6 58 0 84 3 115 thread mm e Thread diameter and appropriate tightening torque Strength grade 12 9 kgf cm 1200 p bolt 117 6 N m 86 ft Ibs Tees Strength grade 8 8 1000 high strength bolt 5 98N m 72 ft lbs D 800 res Strength grade 6 8 5 78 4 N m 58 ft lbs ordinary bolt lt 600 t 58 8 N m 43 ft lbs lt Strength grade 4 8 400 ordinary bolt 2 39 2 N m 29 ft Ibs lt 200 19 6 N m 14 ft Ibs 0 is 0 5 6 8 10 12 14 mm 3 16 1 4 5 16 3 8 15 32 9 16 Thread Fig 5 14 7 3 3 Bolt Tightening Torque Characteristics Figs 6 1 and 6 2 show relationships between time and tightening torque for individual bolt types and sizes While the data are useful for handy reference actual tightening torque will vary depending on tightening conditions and other variables For details please refer to Para 8 3 Tightening Torque Variation Note The term tightening time indicates the impact time after the lower surface of the bolt has come in contact with the material into which it is being tightened e In the tightening conditions shown in Figs 6 1 and 6 2 the screws are being tightened directly into a steel plate accordingly the torque goes up very abruptly in comparison with ordinary bolt tightening conditions
37. ned by measuring the torque with an appropriate torque wrench or torque driver at the beginning of the tightening operations and as necessary during the tightening operations In addition the torque values shown in Para 7 3 2 above are useful as a handy reference and may be utilized as tentative standards 1 Voltage of battery Tightening torque is affected by the voltage output of the battery For example the relationship between tightening torque and the number of M14 x 50 mm 9 16 x 1 7 8 high strength bolts tightened is shown in Fig 8 below As can be seen in the graph tightening torque decreases as the number of bolts tightened increases This phenomenon is caused by the decline in voltage output of the battery due to the increasing number of bolts tightened In particular the tightening torque decreases rapidly just before the battery is fully discharged range a in the graph As this phenomenon is an inherent drawback in any cordless impact driver salespersons are requested to ensure that the customer is fully aware of and understands this characteristic Model WR 12DH M14 x 50 mm 9 16 high strength bolt tightening time 3 seconds Battery voltage and tightening torque 12 lt 1200 10 117 6 N m 86 ft Ibs charged 2 8 3 lt 800 6 78 4 N m 58 ft Ibs 5 B aL atn Fully discharged 4 ra 39 2 N m 29 ft Ibs
38. nging the claw of the carbon brush on the connecting portion at the outside of the brush tube Claw of carbon brush Collar of carbon brush Connecting portion at the outside of brush tube Fig 1 Fig 2 Fig 3 5 Safe handle shape Compared with the previous WH 12DC the housing of the Model WH 12DH produces no clearance caused by vibration because grips R and F made of rubber are provided at the juncture of the handle and the housing is secured with two screws at the center of the handle to prevent the operator s hand from being pinched Furthermore the rear portion of the housing is shaped upward not to interfere with the base of the operator s thumb 6 9 6 V Battery is also available As the 9 6 V battery 9 type is popular in the market it is a strong selling point that both the Models WH 12DH and WR 12DH can also use this battery The following table shows that the tightening torque is a little lower because of a lower voltage but there is little harm in operation Model WH 12DH Voltage 12V 9 6V EB 12 type battery EB 9 type battery Tightening torque 1 000 kgf cm 800 kgf cm M12 high strength bolt 3 sec tightening 98 N m 72 ft lbs 78 5 N m 57 6 ft Ibs e Model WR 12DH Voltage 12V 9 6V EB 12 type battery EB 9 type battery Tightening torque 1 200 kgf cm 950 kgf cm M12 high strength bolt 3 sec tightening 117 6 N m 86 4 ft lbs 93 1 N m 68 4 ft
39. o the head of the bolt or drill bit and or hexagonal portion of the driver chuck which is fitted onto the anvil in the main body will become worn and loose Wear and looseness will cause a proportionate loss of tightening torque In addition use of an incorrect size socket slightly larger than the bolt being tightened will also result in decreased torque 7 Bolt and nut rotate together Tightening torque that can be achieved will be considerably decreased if the bolt and nut rotate together during the tightening operation The customer should be advised to carefully observe the operation and ensure this does not occur 8 4 Suggestions and precautions for the Efficient Use of the Charger 1 Batteries may not be rechargeable immediately after use If the Model EB 12B or EB 12H Storage Batteries are exposed to direct sunshine for an extended period or if the temperature of the batteries is 40 C 104 F or higher immediately after they have been used in the tool the pilot lamp may not light up when the batteries are connected to the Model UC 14YF or UC 14YF2 Charger This is because the built in thermostat functions to stop the charging when the temperature of the storage batteries reach 40 C 104 F or more In such a case the customer should be advised to place the batteries in a shaded area with a good airflow and allow sufficient cooling before recharging This phenomenon is common to all existing batteries which employ temperature sen
40. sitive overcharge devices The cooling time required before charging can be accomplished varies from a few minutes to about 30 minutes depending on the load duration of use and ambient temperature og 9 OTHER PRECAUTIONS 1 Check for cracks or other damage on the socket Cracks or any other faults on the socket are very hazardous In addition cracks or other damage to accessories will cause loss of tightening torque efficiency Advise the customer to inspect accessories often and ensure there are no abnormalities 2 Socket dimensions Without fail utilize an appropriate socket which matches the bolt and or nut dimensions If the socket dimensions are larger than the bolts or nuts it will not only cause insufficient tightening torque but could also easily cause damage to the socket Please refer to the tables in Para 6 2 for appropriate socket dimensions 3 Hammering section lubrication Grease ATTOLUB MS No 2 is utilized in the hammering section Frequent or continuous use of the tool will cause excessive temperature rise of the hammering section resulting in depletion of the grease and subsequent increased wear of components which will in turn cause loss of tightening efficiency Accordingly it is necessary to periodically replenish the grease in the hammering section to ensure proper lubrication of moving and sliding components 24 10 REPAIR GUIDE WARNING Without fail remove the Model EB 12B or EB 12H
41. the battery 1 Number of screws or bolts driven Cordless impact driver Model HITACHI HITACHI Tightening condition WH 12DH WH 12DC 1222 Battery FB 12B EB 128 Corresponding EB 12B Wood screw 3 8 mm dia x 20 820 800 820 soft wood Wood screw 4 5 mm dia x 50 mm soft wood 450 450 450 Wood screw 4 2 mm dia x 75 mm 270 270 270 soft wood Machine screw M8 x 16 mm 1 400 1 400 1 400 Machine screw M8 x 25 mm 1 230 1 230 1 230 Tex screw 4 0 mm dia x 13 mm SPCC t 1 6 210 210 210 2 Ordinary bolt Cordless impact wrench Model HITACHI HITACHI Tightening condition WH 12DH WH 12D 1222 Patay SE IaB EB HB Corresponding EB 12B M8 Number of bolts 1 960 2 240 1 880 ordinary bolt Time sec 0 2 0 2 0 2 M10 Number of bolts 780 900 750 ordinary bolt Time sec 0 5 0 5 0 5 M12 Number of bolts 490 660 470 ordinary bolt Time sec 0 8 0 8 0 8 come 7 4 2 Tightening Time and Number of Screws Driven Per Battery Charge Number of screws tightened pcs 800 700 600 500 400 300 200 100 EB 12B 1 2 3 4 5 sec Tightening time Fig 7 Tightening time and number of screws tightened Fig 7 shows the relationship between the tightening time and the number of screws which can be tightened in a single battery charge in the case of the EB 12B Tightening time is defined as the
42. tion should be given to the following items 1 Reassembly of Housing A assembly a Be sure to follow the wiring diagram Fig 12 1 for proper wiring b When connecting the internal wires of the Motor 23 lt 21 gt to the DC Speed Control Switch 30 lt 28 gt tightly fasten them with the Machine Screw M3 x 5 29 lt 27 gt paying close attention to the direction of the flag terminal Fig 12 2 c Mount the Motor 23 lt 21 gt into Housing A so that the CB cap of the Motor 23 lt 21 gt and the rib for preventing motor body from rotating fit in Housing A Note Make sure that the internal wire purple is passed under the Motor so that it is not caught between the Motor and Housing A d Mount the DC Speed Control Switch 30 lt 28 gt to Housing A so that the projection of the forwarding reversing lever at the top of the Switch is inserted into the U shaped groove of the Pushing Button 31 lt 29 gt Secure the Fin Ass y 32 lt 30 gt to the FET of the DC Speed Control Switch 30 lt 28 gt with the S Tight Screw D3 5 x 6 36 lt 34 gt Note Make sure that the three internal wires from the FET are passed above the DC Speed Control Switch 30 lt 28 gt 2 Reassembly of the Housing A B Set 28 lt 26 gt Mount the Strap 35 lt 33 gt Grip F 33 lt 31 gt R 87 lt 35 gt and Housing B to Housing A and secure them with the seven Tapping Screws D4 x 20 26 lt 24 gt
43. x 30 mm M10 x 30 mm 1000 1000 98 N m 72 ft lbs 98 N m 72 ft lbs High strength bolt 800 800 78 4 N m 58 ft Ibs 78 4 58 ft lbs 2 High strength bolt 2 D 600 D 600 58 8 N m 43 ft Ibs 58 8 N m 43 ft lbs P odi sol E 400 L 39 2 N m 29 ft lbs 39 2 29 ft Ibs Ordinary bolt 200 200 19 6 N m 14 ft lbs Ordinary bolt 19 6 N m 14 ft Ibs 0 0 0 1 2 3 0 1 2 3 Tightening time sec steel plate thickness t 3 8 10 mm Tightening time sec steel plate thickness t 3 8 10 mm kgf cm 15 32 x 1 3 4 M12 x 45 mm 1200 117 6 N m 86 ft lbs High strength bolt 1000 98 N m 72 ft Ibs 800 8 78 4 N m 58 ft Ibs g 600 f 58 8 N m 43 ft Ibs Ordinary bolt 400 39 2 N m 29 ft lbs 200 19 6 N m 14 ft Ibs 0 0 1 2 3 Tightening time sec steel plate thickness t 1 25 mm Fig 6 2 c6 7 4 Number of Screws or Bolts Driven 7 4 1 Per Charge Working Capacity Comparisons Test data on the number of screws or bolts which can be driven per battery charge by the new models vs the previous models are shown in the tables below Please note that the data below are intended for general reference only as the number of screws which can be tightened per charge will vary slightly depending on screw tightening conditions screw sizes ambient temperatures and the charging capacity of
44. y thanks to their performance that produces no reaction force in tightening screws and bolts and also no damage to the screw heads Now we bring out the new cordless impact driver Model WH 12DH developed based on the previous Model WH 12DC The Model WH 12DH has more compact body better tightening performance and longer service life than those of the previous model and is equipped with a replaceable carbon brush motor The new cordless impact wrench Model WR 12DH is also brought out The Model WR 12DH has more compact and lightweight body than that of the previous Model WH 12D The construction of the Model WR 12DH is the same as that of the Model WH 12 DH except the anvil K ass y and the hammer case 3 APPLICATIONS e Tightening loosening of small screws tapping screws wood screws bolts nuts etc e Drilling into wood and various other materials with use of optional accessory drill chuck adapter Applicable Markets e Wood product assembly Tightening loosening of wood screws e Construction industry Assembly of scaffolding roofing aluminum sashes fencing etc removal of plastic cones from concrete forms mounting removal of form ties drilling into the wood frames of concrete forms etc e Manufacturing industry Assembly work for automobiles rolling stock shipbuilding agricultural machinery and tools industrial machines steel furniture etc e Utility industry Assembly and installation of electric equipment plumbing fac
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