DH 38MS
Contents
1. 331 218 SPRING C 331 217 NEEDLE 331 215 SECOND GEAR 331 219 629 VVM SPACER BALL BEARING 629VVC2PS2L 331 220 BEARING WASHER C 992 803 SEAL LOCK HEX SOCKET HD BOLT M6 X 20 986 940 SEAL LOCK HEX SOCKET HD BOLT M6 X 45 994 192 HITACHI LABEL HEX SOCKET HD BOLT W FLANGE M5 X 16 331 245 CRANK COVER 878 713 CYLINDER O RING B 331 523 CRANK CASE 331 549 939 540 SEAL PACKING RETAINING RING FOR D10 SHAFT 10 PCS 331 208 CRANK SHAFT 948 391 RETAINING RING FOR D40 HOLE 620 3DD BALL BEARING 6203DDCMPS2L 996 363 321 274 O RING S 40 OIL SEAL B 331 209 FIRST GEAR 939 299 NEEDLE BEARING M661 331 253 GEAR COVER 307 947 331 248 WING BOLT M6 X 12 MOUNT 949 556 NUT M6 10 PCS 331 247 HANDLE BOLT 331 246 BAND 330 209 945 161 SIDE HANDLE BRUSH CAP 999 043 CARBON BRUSH 1 PAIR 958 900 BRUSH HOLDER 938 477 HEX SOCKET SET SCREW M5 X 8 N NM gt gt a Se gt gt gt Ce Ces es Cee Ces Ces CG 982 631 05 09 WASHER A ALTERNATIVE PARTS PARTS ITEM CODE NO 608 VVM DESCRIPTION BALL BEARING 608VVC2PS2L NO USED DH 38MS REMARKS 331 254 BEARING HOLDER 331 202 TAIL COVE2. Le ey Lock Spring 21 Ir in Crank Case 70 d Slip Clutch Refer to the Technical Data and Service Manual for the Model DH 40MR List No E467 because the slip clutch mechanism is the same as that of the Model DH 40MR 14 2 Application of lubricant Filling special grease for the hammer and hammer drill In the Cylinder Case 7 15 g Connecting Rod 31 side in the Crank Case 70 50 g Application of special grease for the hammer and hammer drill Apply special grease to the inner circumferences of the Cylinder 19 and Connecting Rod 31 the sliding portion of the Second Hammer 15 the O ring C 14 wound around the Second Hammer 15 the sliding portion of the Striker 27 the O ring 28 wound around the Striker 27 and Piston 30 the lip portions at the inner circumference of Oil Seal A 53 and Oil Seal B 77 the inner and outer circumferences of the Bevel Gear 25 the inner circumference of metal in the Cylinder Case 7 and the lip portions at the inner circumference of oil seals in the Cylinder Case 7 Damper 17 and Retainer Damper 10 Filling Hitachi Motor Grease No 29 First Gear 78 side and Gear Cover 80 side in the Crank Case 70 30 g in total Application of Hitachi Motor Grease No 29 Pinion portions of the Needle Bearing M661 79 Armature Ass y 43 and Needle Roller D8 x 20 13 3 Tightening torque Apply screw locking agent TB1401 to all hex socket
3. D5 x 30 black 95 Remove the Crank Case 70 from the Housing Ass y 48 and Handle 97 Remove grease from the Piston 30 side and First Gear 78 side of the Crank Case 70 Use a retaining ring puller to remove the Rataining Ring for 040 Shaft 74 fixing the Ball Bearing 6203DDCMPS2L 75 At this time turn the Crank Shaft 73 to expose the hole of the Retaining Ring for the D40 Shaft 74 prior to removal Use a hand press to press the end face of the Crank Shaft 73 and then remove the First Gear 78 and Crank Shaft 73 from the Crank Case 70 Fig 3 First Gear 78 Crank Case 70 x Crank Case 70 Crank Shaft 73 Retaining Ring for 040 Hole 74 Crank Shaft 73 Support 12 d Slip Clutch Refer to the Technical Data and Service Manual for the Model DH 40MR List No E467 because the slip clutch mechanism is the same as that of the Model DH 40MR Reassembly Perform reassembly by reversing the order of the disassembly procedure However special attention should be given to the following items 1 Reassembly of the hammering mechanism a First Gear 78 and Crank Shaft 73 Press fit Oil Seal B 77 into the Crank Case 70 mount the O ring 76 Then First Gear 78 press fit the Ball Bearing 6203DDCMPS2L 75 Use a retaining ring puller to mount the Retaining Ring for the D40 Shaft 74 Press fit the Crank Shaft 73 into Ball Bearing 6203DDCMPS82L 75 Put the Feather
4. from the Crank Case 70 beforehand because the Bevel Gear 25 cannot be removed with the Lever Shaft 36 remaining in the Crank Case 70 Remove the Seal Lock Hex Socket Hd Bolt W Flange M6 x 25 8 Then the Cylinder Case 7 Spring Holder B 20 Retainer Sleeve 12 and other parts can be removed from the main body Remove the Second Hammer 15 from the Retainer Sleeve 12 together with the Damper Holder 18 Damper 17 and Damper Washer 16 Pull out the Cylinder 19 from the main body together with the Lock Spring 21 Lock Sleeve 22 Clutch Spring 23 and Clutch 24 Remove the Striker 27 by tapping the end surface of the Cylinder 19 with a plastic hammer Fig 2 11 Damper 17 Damper Washer 16 Damper Holder 18 Retainer Sleeve 12 Crank Shaft 73 Retaining Ring for D10 Shaft 72 Lock Sleeve 22 Clutch Spring 23 la SLOT Tif BN Ja Te ale L s Striker 27 CB mW B Lock Spring 21 ifs 1N ER ES Cylinder 19 Piston 30 Es Connecting Rod 31 b Piston 30 To remove the Piston 30 use a retaining ring puller to remove the Retaining Ring for the D10 Shaft 72 and then remove the Connecting Rod 31 from the Crank Shaft 73 c First Gear 78 and Crank Shaft 73 Remove the Seal Lock Hex Socket Hd Bolt M6 x 45 65 Seal Lock Hex Socket Hd Bolt M6 x 20 64 Hex Socket Hd Bolt W Flange M5 x 16 67 and Tapping Screw W Flange
5. Key 3 x 3 x 8 51 into the groove of the Crank Shaft 73 and then press fit the First Gear 78 with a suitable jig while holding the flat portion of the Crank Shaft 73 with a steel bar Before press fitting make sure that the Feather Key 3x 3x8 51 fits into the key groove of the First Gear 78 Fig 4 3 x 3 x 8 Key 51 OW _ Support Oil seal B 77 SI 176 Steel Bar Crank Shaft 73 Retaining Ring for D40 Hole b Piston 30 Insert the Connecting Rod 31 into the Piston 30 and then insert the Piston Pin 29 into the 8 mm dia hole on the marked side of the Piston 30 Be careful not to protrude the Piston Pin 29 from the outer diameter of the Piston 30 Mount the O ring 28 to the Piston 30 to complete the piston ass y Move the crank pin of the Crank Shaft 73 to the bottom dead center and then mount the piston ass y to the Crank Shaft 73 from the Cylinder Case 7 side of the Crank Case 70 Use a retaining ring puller to mount the Retaining Ring for the D10 Shaft 72 Fig 5 Mark Crank Shaft 73 Retaining Ring for D10 Shaft 72 Piston Pin 29 Piston 30 O Ring 28 Connecting Rod 31 j Piston Ass y Crank Case 70 13 c Cylinder 19 and Retainer Sleeve 12 Mount the Retainer Damper Washer 11 and Retainer Damper 10 to the Retainer Sleeve 12 in this order by aligning the rounded portion of the Retainer Damper Washer 11 with
6. Piston Connecting Rod Cylinder Lock Sleeve Clutch Striker O Ring 17 LIST NO H402 2 Q Q L 0 m Cp 1d lt A m O O ELECTRIC ROTARY HAMMER 2009 5 26 1 Model DH 38MS 8 e C 2 A 8 A V __ ____ _________ 0 oe oo 69 3 O 991095 8 JS o of 0 oE 9 007 A S 9 S J D G OO ea A 89 9 6 d J PARTS DH 38MS ITEM NO CODE NO DESCRIPTION USED REMARKS 331 542 FRONT CAP 331 541 GRIP 331 540 STOPPER RING 331 539 NEEDLE HOLDER 331 538 RETAINER SPRING 331 537 SPRING HOLDER A 331 530 CYLINDER CASE 991 712 HEX SOCKET HD BOLT W FLANGE M6 X 25 956 996 O RING 1AS 60 331 531 RETAINER DAMPER 331 532 RETAINER DAMPER WASHER 331 524 RETAINER SLEEVE 331 536 NEEDLE ROLLER D8 X 20 313 396 O RING C 331 525 SECOND HAMMER 331 224 DAMPER WASHER 321 835 DAMPER 331 225 DAMPER HOLDER 331 526 CYLINDER 331 533 SPRING HOLDER B 331 534 LOCK SPRING 331 535 LOCK SLEEVE 331 5277 CLUTCH SPRING 331 528 CLUTCH 331 529 BEVEL GEAR 331 234 THRUST WASHER 331 235 STRIKER 986 104 O RING 331 221 PISTON PIN 326 369 PISTON 321 285 CONNECTING ROD 983 162 SEAL LOCK HEX SOCKET HD BOLT X 12 331 545 CHANGE LEVER 331 544 LEVER HOLDER 311 229 RETAININ
7. SDS plus shank bit adapter Drill bit SDS plus shank SDS plus shank bit adapter SDS max shank 313465 4 3 Boring work for large diameter holes rotation hammering 1 77 41 _ D QD Qs Guide plate 1 Center pin 2 Core bit 3 Core bit shank SDS max shank 2 Core bit 1 Center pin 3 Core bit shank SDS max Guide plate pue 147 5 25 32 956009 C a O TO O0 64 2 1 2 300 11 13 16 313467 133 5 1 4 955165 94 3 11 16 956004 O 105 4 1 8 955159 O 13mm drill chuck Chuck adapter 13VLD D SDS max shank Chuck wrench 13 mm drill chuck 13VLD D with chuck wrench Chuck adapter Code No 321813 313468 5 Chemical anchor holes drilling work rotation hammering EIE Socket Chemical anchor adapter SDS max shank Socket square size mm 12 7 1 2 313469 19 0 3 4 313470 6 Demolishing work hammering Bull point SDS max shank 070 SSS 280 11 313471 450 15 3 4 313472 7 Groove digging and edging hammering Cold chisel SDS max shank r j DA 280 11 313473 450 15 3 4 313474 8 Cutting and stripping cutting asphalt etc hammering Cutter SDS max shank 0 Il Width mm 400 15 3 4 50 2 313475 9 Scooping work hammering ocoop SDS max shank 400 15 3 4 313476 10 Surface roughing work hammering Bush
8. Test conditions gt Drill Bit Dia mm 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 Comparison of chiseling performance HITACHI DH 38MS HITACHI DH 40MR 20 40 60 Chiseling amount kg 30 min Chiseling performance varies considerably depending on the work conditions Use the factory test results for comparison purposes only Refer to the Technical Data and Service Manual of the current Model DH 40MR for the following DH 40MR List No E467 3 Easy to operate and double molded side handle The base material of the side handle is plastic resin The plastic resin base is integrally molded with soft resin to realize a double layer structure As a result the grip of the soft side handle affords easier operation 4 Change lever for switching between Rotation Hammering Neutral and Hammering only The Models DH 38MS provides three functions the rotation hammering function for drilling neutral function for positioning the tool tip and hammering LOWE only function for chiseling and chipping These function modes can be easily switched by using the change lever The tool angle can be easily changed in 12 steps by turning the grip with the change lever positioned at Neutral Needle pin type of slip clutch The Model DH 38MS is equipped with a needle
9. diagram for products with a noise suppressor Switch C 1P screw type w o lock Stator ass y OOOO e Noise Armature ass y 4 i Suppressor Plug Connector YOU Pillar Terminal 5 Insulation tests Upon the completion of disassembly and repair measure the insulation resistance and dielectric strength Insulation resistance 7M Q or more using a 500 VDC megohm tester Dielectric strength 4 000 VAC minute with no abnormalities 220 to 240 V 110 V for U K products 2 000 VAC minute with no abnormalities 110 to 127 V Except for U K products 6 No load current value After no load operation for 30 minutes the no load current values should be as follows Curent A a 16 STANDARD REPAIR TIME UNIT SCHEDULES a Flow Handle Cover Housing Ass y Switch C Stator Ass y Cord Cord Armor Gear Cover Needle Bearing Armature Ass y Ball Bearing Crank Cover 6201 DDCMPS2L Dust Washer B Ball Bearing 608 VVC2PS2L Handle Crank Shaft Crank Case Ball Bearing 6203 DDCMPS2L Oil Seal B First Gear General zm Lever Lever Holder Lever Shaft Slip Clutch Ass y Bevel Pinion Oil Seal A Ball Bearing 6002 DDCMPS2L Washer A Front Cap Cylinder Case Grip Retainer Needle Holder Damper Retainer Sleeve Gear Holder Second Gear Ball Bearing 629 VVC2PS2L Second Hammer Damper Bevel Gear
10. effort is made in each step of design manufacture and inspection to provide protection against safety hazards the dangers inherent in using any electric tool cannot be completely eliminated Accordingly the Handling Instructions list general precautions and suggestions on the use of electric power tools and specific precautions and suggestions on the use of rotary hammers to enhance the safe efficient use of the tool by the customer Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to offer appropriate guidance to customers during sales promotion activities B Caution plate Each Model DH 38MS unit is provided with a Caution Plate shown below that lists basic safety precautions on its use Carefully ensure that customers fully understand and follow these precautions before using the tool For Australia and New Zealand CAUTION eRead thoroughly HANDLING INSTRUCTIONS before use For the USA and Canada WARNING e To reduce the risk of injury user must read instruction manual eAfin de r duire le risque AVERTISSEMENT de blessures l utilisateur doit lire le mode d emploi For China ES fe FB BUS 2B RS fe AB 9 C Grease replacement procedures The hammering section and gear change section use different types of grease There is no need to replenish the grease unless disassembling the tool for repair or in case grease is leaking due to a damaged sea
11. pin type of slip clutch for higher slip torque accuracy and enhanced safety same as the Model DH 40 SPECIFICATIONS 1 Specifications DH 38MS Drill bit max dia 38 1 31 64 Capacity mm Core bit max dia 105 4 9 64 Materials Aluminum alloy die casting Cylinder case crank case gear cover Nylon resin Enclosure Handle handle cover tail cover crank cover Polycarbonate resin Housing Paint Green black silver metallic green witch __ JT ggeswich S ype of handles __ Deshapedhandleandsidehande _ _ No load rotation rate ENS Voltage ower input ull load impact rate 2 800 ackaging Weight kg Ibs Plastic case Standard accessories Side handle Excluding cord and side handle 9 5 20 9 292 2 Optional Accessories 1 Drilling work for through hole drilling rotation impact Drill bit SDS max shank 313456 313457 313458 313459 313460 313461 313462 2 Drilling work for anchor holes rotation hammering Drill bit taper shank qr et D a 1 Drill bit taper shank 2 Taper shank adapter SDS max shank 0 3 Cotter 1 Drill bit taper shank 2 Taper shank adapter 3 Cotter 11 0 7 16 100 4 944460 12 3 15 32 110 4 5 16 944461 14 3 9 16 110 4 5 16 944462 Morse taper No 1 313464 944477 14 5 9 16 110 4 5 16 944500 17 5 11 16 120 4 3 4 944463
12. the rounded portion of the Retainer Sleeve 12 Mount the Second Hammer 15 with O ring C 14 mounted Damper Washer 16 Damper 17 and Damper Holder 18 in this order by aligning the rounded portion of the Damper Washer 16 with the rounded portion of the Second Hammer 15 Insert the assembly of the Retainer Sleeve 12 into the Cylinder Case 7 and then insert Spring Holder B 20 into the Cylinder Case 7 Insert the Striker 27 with the O ring 28 mounted into the Cylinder 19 Mount the Clutch Spring 23 Clutch 24 Bevel Gear 25 and Thrust Washer 26 to the Cylinder 19 and then insert this Cylinder 19 ass y into the Crank Case 70 Insert the Lock Sleeve 22 into the Crank Case 70 by aligning the spline groove at the inner circumference of the Crank Case 70 with the spline of the Lock Sleeve 22 Put the Lock Spring 21 on the Lock Sleeve 22 Finally put the Cylinder Case 7 with the Retainer Sleeve 12 mounted and the Crank Case 70 with the Cylinder 19 mounted together by meshing the claw of the Retainer Sleeve 12 with the groove of the Cylinder 19 Fig 6 Damper Holder 18 Damper Washer 16 Cylinder Case 7 Spring Holder B 20 Damper 17 2 Bevel Gear 25 P d Clutch Spring 23 Thrust Washer 26 Retainer Damper Washer 11 tock Sleeve 22 Clutch 24 raga T ha Retainer Damper 10 Striker 27 Cylinder 19
13. D4 X 25 BLACK 331 547 331 550 DUST SEAL WASHER FW STANDARD ACCESSORIES DESCRIPTION CODE NO 331 206 REMARKS ALTERNATIVE PARTS Printed in Japan 05 09 090526N
14. G RING FOR D20 HOLE 331 543 LEVER SHAFT 873 095 O RING 16 331 548 PIN D2 X 10 331 546 LEVER SPRING 321 311 PUSHING BUTTON 620 1DD BALL BEARING 6201DDCMPS2L 325 003 DUST WASHER B 360 875C ARMATURE 110V 360 875U ARMATURE ASS Y 120V 360 875E ARMATURE 220V 230V 360 875F ARMATURE 240V 331 252 FAN GUIDE 953 174 HEX HD TAPPING SCREW 05 X 55 340 753C STATOR ASS Y 110V N OOA ND e INCLUD 41 42 91 92 INCLUD 47 INCLUD 47 FOR VEN 340 753G STATOR ASS Y 110V 2 ALTERNATIVE PARTS 05 09 PARTS ITEM CODE NO 340 753D DESCRIPTION STATOR ASS Y 120V NO USED INCLUD REMARKS 47 DH 38MS 340 753E STATOR ASS Y 220V 230V INCLUD 47 340 753H STATOR ASS Y 220V 230V INCLUD 47 FOR THA INA SIN IND 340 753J STATOR ASS Y 240V INCLUD 47 li 340 753F 930 703 STATOR ASS Y 240V BRUSH TERMINAL INCLUD 47 FOR AUS 331 251 HOUSING ASS Y INCLUD 89 90 331 210 SLIP CLUTCH ASS Y INCLUD 50 52 54 62 331 211 BEVEL PINION 944 109 331 212 FEATHER KEY 3X3X8 COLLAR 313 050 OIL SEAL A 600 2DD BALL BEARING 6002DDCMPS2L 331 213 WASHER 331 214 321 281 WASHER A GEAR HOLDER
15. Hitachi Power Tools WK DH 38MS H402 TECHNICAL DATA AND SERVICE MANUAL May 2009 PRODUCT NAME Hitachi Rotary Hammer Model DH 38MS MARKETING OBJECTIVE The new Model DH 38MS is capable of drilling holes of up to 38 mm in diameter into concrete and is compatible with SDS max shank tools n eSI e Drilling holes in concrete and drilling anchor holes e Demolishing and chiseling concrete Edging gravel road digging compacting and tamping grooving cutting stripping and roughing etc _____ _6_ _____ ___ SPECIFICATIONS AND PARTS ARE SUBJECT CHANGE FOR IMPROVEMENT au __ New features Same features as the conventional models gt Fastest drilling soeed and best chiseling 3 Easy to operate with a double molded side handle performance in its class 4 Variable lock mechanism for easy working angle Functional and robust design adjustment of chisels etc 5 Needle pin type of slip clutch HITACHI Hitachi Koki Co Ltd International Sales Division REMARKS For more information about HANDLING INSTRUCTIONS visit our website at http www hitachi koki com manual_ view export This TECHNICAL DATA AND SERVICE MANUAL utilizes a symbol to denote the company name and model name of our competitor The symbol utilized he
16. R 302 089 TAPPING SCREW W FLANGE D5 X 20 BLACK 331 203 NOISE SUPPRESSOR EXCEPT FOR VEN THA INA SIN KUW USA CAN MEX IND 331 204 HANDLE 330 216 INTERNAL WIRE 270L EXCEPT FOR VEN THA INA SIN KUW USA CAN MEX IND 959 141 CONNECTOR 50092 10 PCS NAME PLATE EXCEPT FOR USA CAN MEX 500 3902 CORD CORD ARMOR D8 2 500 2392 CORD CORD ARMOR D10 7 FOR VEN THA 500 4242 CORD CORD ARMOR D8 2 FOR SIN KUW 500 2352 500 4392 CORD CORD ARMOR D8 2 FOR INA IND CORD ARMOR D8 2 FOR NZL AUS 500 4342 CORD ARMOR 08 2 FOR USA CAN MEX 500 4462 CORD ARMOR 08 2 FOR GBR 230 500 4542 CORD ARMOR 08 2 FOR GBR 110 500 3912 500 4572 CORD CORD ARMOR D8 2 FOR SUI CORD ARMOR D10 7 FOR CHN 500 4772 CORD CORD ARMOR D10 7 FOR TPE 500 4752 CORD CORD ARMOR 08 2 FOR KOR 958 049 CORD ARMOR D8 2 940 778 981 974 CORD ARMOR D10 7 INTERNAL WIRE EXCEPT FOR VEN THA INA SIN KUW USA CAN MEX IND 313 093 SWITCH C 2P SCREW TYPE W O LOCK 938 307 PILLAR TERMINAL EXCEPT FOR VEN THA INA SIN KUW IND 959 141 960 266 CONNECTOR 50092 10 PCS CORD CLIP EXCEPT FOR USA CAN MEX 984 750 TAPPING SCREW W FLANGE D4 X 16 331 205 HANDLE COVER 307 028 TAPPING SCREW W FLANGE
17. head bolts M4 M5 and M6 NOTE Be sure to apply screw locking agent Three Bond TB1401 to the threads during reassembly Otherwise any bolts loosened due to vibration may damage the tool body M6 Seal Lock Hex Socket Hd Bolt x 45 65 For mounting the housing 9 8 0 98 Nem 100 10 Seal Lock Hex Socket Hd Bolt M6 x 20 64 T2 For mounting the gear cover 98 P Nem 100 kgfecm Hex Socket Hd Bolt W Flange M6 x 25 8 1 96 0 For mounting the cylinder case 9 8 N m 100 T d kgfecm M5 Hex Socket Hd Bolt W Flange 5 x 16 67 For mounting the crank cover 7 84 i s Nem 80 i kgf cm Hex Socket Hd Bolt W Flange M5 x 16 67 For mounting the handle 5 88 Pa N m 60 kgfecm M4 Seal Lock Hex Socket Hd Bolt x 12 32 For mounting the change lever 4 41 0 49 Nem 45 5 kgfecm Tapping Screw W Flange D5 2 94 0 49 Nem 30 5 kgfecm Tapping Screw W Flange DA 1 96 0 49 Nem 20 5 kgfecm 15 4 Internal wiring 1 Wiring diagram for products without a noise suppressor Switch C 1P screw type w o lock Stator ass y Armature ass y 010010 ER Connector or Pillar Terminal 2 Wiring
18. ing tool Shank SDS max shank 313477 220 8 21 32 313479 6 11 Tamping work hammering F L a gt x Rammer Shank SDS max shank 150 5 29 32 313478 220 8 21 32 313479 12 Syringe for chip removal 318085 Blow out bulb 320859 Bellows Blow out bulb 13 Grease 500 g 1 1 Ibs 30 g 1 oz tube 980927 981840 NOTE The code numbers listed above are subject to change without notice Please refer to periodic Technical News Bulletins for updates 7 COMPARISON WITH SIMILAR PRODUCTS 1 Comparison of Specifications Superior specifications HITACHI DH 38MS DH 40MR 40 1 9 16 105 4 1 8 240 480 Full load impact rate Full load vibration level Tri axial measured measured measured 16 15 16 253 10 3 64 9 31 32 104 102 4 7 64 4 1 16 6 5 14 3 5 8 12 8 Weight does not include the cord and side handle 8 PRECAUTIONS ON SALES PROMOTION 1 Safety Instructions In the interest of promoting the safest and most efficient use of the Model DH 38MS Rotary Hammer by all of our customers it is very important that when conducting a sale that the salesperson carefully ensure that the buyer seriously recognizes the importance of Handling Instructions and fully understands the precautions listed on the Caution Plate and Nameplate attached to each tool A Handling instructions Although every
19. l special grease is used for the hammering section After disassembling the hammering section inside the cylinder case and crankcase carefully wipe the old grease off the parts and fill the cylinder case and crankcase on the connecting rod side with 50 g of grease Be careful not to overfill the grease as an excessive amount of grease can cause hammering failure The gear change section inside the gear cover uses Hitachi Motor Grease No 29 The proper amount of grease is 30 g Never use this special grease for the hammering section in the gear change section Otherwise the special grease will leak into the motor section and subsequently cause trouble Periodically change the grease in the slip clutch Fully fill the slip clutch with Hitachi Motor Grease No 29 REFERENCE MATERIALS Refer to the Technical Data and Service Manual for the model indicated below 1 Torque transmission 2 Striking operation 3 Mechanism to prevent idle hammering 4 Slip clutch mechanism 5 Tool holder 6 Sealing and dust proof structure 7 Switching between Rotation Hammering Neutral and Hammering only DH 40MR List No E467 10 REPAIR GUIDE Be sure to disconnect the power cord plug from the wall outlet before conducting repair Otherwise the motor may suddenly run posing a very dangerous situation 1 Precautions on Disassembly and Reassembly The Bold numbers in the descriptions below correspond to item numbers i
20. n the Parts List and exploded view assembly diagram for the Model DH 38MS Disassembly 1 Disassembly of the tool retainer While pulling the Grip 2 in the arrow direction remove the Front Cap 1 which is fitted securely Forcibly pull the Front Cap 1 to remove it Then the Grip 2 can be removed from the Retainer Sleeve 12 Remove the Stopper Ring 3 by using a retainer ring puller Then the Needle Holder 4 two Needle Rollers D8 x 20 13 Retainer Spring 5 and Spring Holder A 6 can be removed from the Retainer Sleeve 12 Fig 1 Stopper Ring 3 D8 X 20 Needle Roller 13 Front Cap 1 Needle Holder 4 Grip 2 Spring Holder A 6 Retainer Spring 5 2 Disassembly of the hammering mechanism a Second Hammer 15 and Striker 27 Remove the Seal Lock Hex Socket Hd Bolt M5 x 16 67 from the Crank Cover 68 Remove the Crank Cover 68 from the Crank Case 70 Remove the Seal Lock Hex Socket Hd Bolt M6 x 20 64 and Seal Lock Hex Socket Hd Bolt M6 x 45 65 Remove the Gear Cover 80 from the Crank Case 70 Remove the Slip Clutch Ass y 49 from the Crank Case 70 beforehand because the Bevel Gear 25 cannot be removed with the Slip Clutch Ass y 49 remaining in the Crank Case 70 Remove the Seal Lock Hex Socket Hd Bolt M4 x 12 32 and the Change Lever 33 Remove the Retaining Ring for D20 Hole 35 securing the Lever Shaft 36 with a retaining ring puller Remove the Lever Shaft 36
21. rein is as follows Competitors symbol utilized CONTENTS SELLING POINTS rn nnn n nnn n n nnn nnn n nnn nn nnn rSn T MITT TTMMM MM MM 1 SPECIFICATIONS 3 1 Specifications 3 2 Optional Accessories 4 COMPARISON WITH SIMILAR PRODUCTS II I Ia u T n nnn n nn 8 1 Comparison of Specifications ee e 8 PRECAUTIONS ON SALES PROMOTION rere r rrr Tr n T MTM 9 1 Safety Instructions 9 REFERENCE MATERIALS U U U Q 10 REPAIR GUIDE U U U U U U U UU U U U u U 11 1 Precautions on Disassembly and Reassembly 11 STANDARD REPAIR TIME UNIT SCHEDULES Q 17 Assembly Diagram for DH 38MS SELLING POINTS Fastest drilling speed and best chiseling performance in its class We conducted digital engineering to determine the optimal impact specifications As a result the Models DH 38MS offers the fastest drilling speed and best chiseling performance in its class Based on our own research Comparison of drilling speed 300 HITACHI DH38MS amp HITACHI DH40MR Drilling Speed mm min 0 16 18 20 22 24 26 28 30 32 34 36 38 lt
Download Pdf Manuals
Related Search