Makita HR2450FT Technical Information

Specification Standard equipment Optional accessories < Note > The standard equipment for the tool shown may differ from country to country. P 1 / 22 HR2450FT, HR2450T 24mm (15/16") Rotary Hammer The above models are the advanced version of MAKITA's famous 3 -mode rotary hammer HR2450. Each new model features : HR2450T : possible to quickly change from the chuck for SDS-plus to keyless drill chuck mutually without any tool HR2450FT : equipped with built in job light in addition to HR2450T's feature Dimensions : mm ( " ) Width ( W ) Height ( H ) Length ( L ) Model No. 384 (15-1/8) 212 (8-3/8) 204 (8) 72 (2-13/16) HR2450FT HR2450T W H L 780 780 780 780 780 370 370 370 370 370 650 650 650 650 650 Continuous Rating (W) Voltage (V) Cycle (Hz) Input Output Max. Output(W) 110 7.5 6.7 3.7 3.6 3.4 120 220 230 240 Current (A) 50 / 60 50 / 60 50 / 60 50 / 60 50 / 60 Model No. HR2450FT HR2450T Bit shank SDS plus type Blows per min, :(bpm=min -1) No load speed : (min -1= rpm) Protection against electric shock Net weight :Kg (lbs ) Cord length : m ( ft ) Single blow energy ( J ) Variable switch Reverse switch Steel. : mm (") Wood : mm (") Concrete : mm (") SDS plus type Yes Yes Yes Yes 2.7 2.7 0 - 1,100 0 - 1,100 0 - 4,500 0 - 4,500 * 24 (15/16 ) * 25mm (1") for USA. 13 (1/2 ) 13 (1/2 ) * 24 (15/16 ) 32 (1-1/4 ) 32 (1-1/4 ) double insulation double insulation ** 4 (13.1) ** 4 (13.1) 2.6 (5.7) 2.6 (5.7) ** 2.5m (8.2 ft) for Asia ** 2.0m (6.6 ft) for Australia Built in job light Yes No * Stopper pole ........................ 1 pc. * Quick change drill chuck ..... 1 pc. * Plastic carrying case ............ 1 pc. * Side grip ..................... 1 pc. * T.C.T hammer drill bits 5.5mm - 24mm (7/32" - 15/16") * Bull point 14mm (9/16") * Cold chisel 20mm (13/16") * Scaling chisels 38mm and 50mm (1-1/2" and 2") * Grooving chisels 8mm and 12mm (5/16" and 1/2") * Scraper assembly * Core bits * Center bits * Core bit adaptor * Rod * Core bits (dry type) * Taper shank adaptor * Taper shank T.C.T.hammer drill bits * SDS plus hammer chuck set * SDS plus adapter * Dust cups 5 and 9 * Safety goggle * Bit grease * Blow out bulb * Dust extractor attachment * Hammer service kit Capacity

< 1 > Lubrication to the bit holder section Apply MAKITA grease to the following portions to protect parts and product from unusual abrasion. * MAKITA grease RA No.1 to the portions designated with black triangle. * MAKITA grease FA No. 2 to the portions designated with gray triangle. * MAKITA hammer oil to the portions with white triangle. Position No. Parts item MAKITA grease Amount : g (oz) Portion to be lubricated Position No. Parts item MAKITA grease Amount : g (oz) Portion to be lubricated Quick change chuck assembly 95 95 Cap 35 Inner lip of bit inserting side. Whole part Whole part Whole part Whole part Whole part The inside where (103) tool holder contacts. The inside where (21) tool holder guide contacts. 96 97 98 98 Stopper 99 99 Steel ball 7 Steel ball 6 Steel ball 6 100 101 102 103 104 104 104 104 Tool holder 103 Steel ball 5.0 Steel ball 5.0 108 105 106 107 109 110 108 108 108 111 105 106 107 109 110 111 MAKITA grease RA No.1 MAKITA grease RA No.1 MAKITA grease FA No.2 Quick change drill chuck assembly 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04)

< 2 > Lubrication to the machine parts Apply MAKITA grease to the following portions to protect parts and product from unusual abrasion. * MAKITA grease RA No.1 to the portions designated with black triangle. * MAKITA grease FA No. 2 to the portions designated with gray triangle. * MAKITA hammer oil to the portions designated with white triangle. * Disulphide molybdenum alloyed grease to the portions designated with arrow. 19 15 14 12 13 80 39 40 41 42 49 21 22 23 24 25 26 27 28 29 93 32 30 34 48 Position No. Parts item Change lever Top of the pins Whole portion MAKITA grease Amount : g(oz) Portion to be lubricated 12 O ring 17 13 Inner portion for the mechanical parts Groove for mounting (13) O ring 17 Gear housing 14 Needle bearing 15 Spur gear 51 19 MAKITA grease RA No.1 Inner ring Inner portion where (21) tool holder guide contacts. Inner hole for reciprocating (24) impact bolt. Inner portion where (30) striker reciprocates. Tool holder guide 21 X ring 9 23 Whole portion O ring 15 26 Whole portion O ring 9 28 Accepting hole for (34) piston joint Piston cylinder 32 Clutch cam 39 Whole portion Teeth portion O ring 68 48 Swash bearing 10 Helical gear 26 41 42 Teeth portion Spur gear 10 80 Accepting hole for (40) cam shaft Accepting hole for (40) cam shaft The surface where (42) helical gear 26 contacts. Inner portion where (32) piston cylinder contacts. The portion where (49) inner housing contacts. Disulfide molyb- denum alloyed grease Whole of groove portion Convex portion of cam Convex portion of cam The portion where balls are installed MAKITA grease FA No.2 MAKITA hammer oil XLD MAKITA grease RA No.1 55 (1.91) 0.5 (0.02) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 1.0 (0.04) 4.0 (0.14)

< 3 > Assembling quick change chuck (1) Mount torsion spring 31 by inserting pin of torsion spring 31 into the hole of tool holder and mount 2 pcs. of steel ball 6.0 to tool holder. See Fig. 1. (2) Mount change ring to the inside of change cover while aligning the hole of change ring with the hole of change cover. See Fig. 2. (3) Mount tool holder to change cover by passing the long pin of torsion spring 31 through the holes of change ring and change cover. And turn the tool holder approx. by 75°. See Fig. 3. Short Pin of torsion spring 31 Long pin of torsion spring 31 Coat the steel ball 6.0 with MAKITA grease N No.1, before mounting. Now the steel ball sticks on the hole of tool holder. Torsion spring 31 Tool holder Steel ball 6.0 Fig. 1 Fig. 2 Change cover Change ring Change cover Change ring Holes for pin of torsion spring 31 Long Pin of torsion spring 31 The hole of change ring aligned with the hole of change cover Long pin of torsion spring 31 Approx. 75° Fig. 3

< 4 > Disassembling quick change chuck (4) Mount steel ball 5.0 to the space between change cover and tool holder. And secure the steel ball 5.0 with leaf spring. See Fig. 4. (5) Mount flat washer 24. See Fig. 5. (6) Secure flat washer 24 with ring spring 21. See Fig. 6. (7) Mount flat washer 2. And then mount steel ball 7.0 to the hole of tool holder. See Fig. 7. (8) Mount conical compression spring 21-29, guide washer and stopper. See Fig. 8. (1) Remove cap 35 while sliding chuck cover in the direction designated with arrow. See Fig. 12. (2) Remove ring spring 19, keeping the chuck cover in the slid position. See Fig. 12. (3) Remove chuck cover, stopper, guide washer, conical compression spring 21-29. See Fig. 13. (4) Remove steel ball 7.0 and flat washer 21. See Fig. 14. (9) Mount chuck cover. See Fig. 9. (10) While sliding the chuck cover in the direction designated with arrow, mount ring spring 19. See Fig. 10. Now the parts mounted in Fig. 7, Fig. 8 and Fig.9 have been secured with the ring spring 19. (11) Mount cap 35 as illustrated in Fig. 11. Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Steel ball 5.0 Leaf spring Leaf spring Flat washer 24 Flat washer 24 If it is difficult to mount leaf spring with your hand, mount it with "retaining ring plier for shaft." Ring spring 21 Steel ball 7.0 Flat washer 21 Stopper Guide washer Conical compression spring 21-29 Chuck cover Ring spring 19 Coat the steel ball 7.0 with MAKITA grease N No.1, before mounting. Now the steel ball sticks on the hole of tool holder. Cap 35 Slide chuck cover. Ring spring 19 Cap 35 Chuck cover Fig. 12 Chuck cover Stopper Guide washer Conical compression spring 21-29 Fig. 13 Steel ball 7.0 Flat washer 21 Fig. 14

< 5 > Assembling quick change drill chuck Leaf spring Flat washer 24 Flat washer 24 Ring spring 21 Steel ball 5.0 Leaf spring Leaf spring Fig. 15 Fig. 16 Fig. 18 Fig. 16A (5) Remove ring spring 21. Then, flat washer 24 can be removed from tool holder. See Fig. 15. (6) Remove leaf spring with No.1R212 "Retaining Ring Plier". Then, steel ball 5.0 can be removed from tool holder. See Fig. 16. If it is difficult to remove leaf spring with No.1R212 "Retaining Ring Plier", slightly knock the change cover to the working table several times. Then, leaf spring can be removed. See Fig. 16A. (7) Remove tool holder and change ring from change cover. See Fig. 17. (8) Remove torsion spring 31 and steel ball 6.0 from tool holder. See Fig. 18. (1) Mount keyless drill chuck 13 to chuck holder by turning it clockwise. See Fig. 19. (2) Secure the keyless drill chuck by turning flat head screw M6x22 counter-clockwise. See Fig. 19. (3) Mount the keyless drill chuck, while aligning the flat portion of chuck holder with the flat portion of spacer. See Fig. 20. Fig. 17 Tool holder Change ring Change cover Torsion spring 31 Tool holder Steel ball 6.0 Chuck holder Hold this part with vise firmly. Keyless drill chuck 13 Flat head screw M6x22 Fig. 19 Align the flat portion. Align the flat portion. Chuck holder Spacer Fig. 20 Change cover Fastening torque for keyless drill chuck 13 is 36 - 46N.m.

(4) Mount torsion spring 31 to the chuck holder by inserting its short pin into the pin hole of chuck holder. See Fig. 21. Insert the short pin of torsion spring 31 into the pin hole of chuck holder. Fig. 21 (5) Mount change ring to the inside of change cover while aligning the hole of change ring with the hole of change cover. See Fig.22. Change cover Change ring Change cover Change ring Holes for pin of torsion spring 31 Fig. 22 (6) Keyless drill chuck 13 to change cover by passing the long pin of torsion spring 31 through the holes of change ring and change cover. And turn the keyless drill chuck 13 approx. by 75°. See Fig. 23. The hole of change ring aligned with the hole of change cover Long pin of torsion spring 31 Approx. 75° Fig. 23 Steel ball 5.0 Leaf spring Leaf spring If it is difficult to mount leaf spring with your hand, mount it with "retaining ring plier for shaft." Flat washer 24 Flat washer 24 Ring spring 21 Fig. 24 Fig. 25 Fig. 26 (7) Mount steel ball 5.0 to the space between change cover and chuck holder. And secure the steel ball 5.0 with leaf spring. See Fig. 24. (8) Mount flat washer 24. See Fig. 25. (9) Secure flat washer 24 with ring spring 21. See Fig. 26.

< 6 > Disassembling quick change drill chuck Fig. 27 Fig. 28 Fig. 29 Fig. 30 Fig. 29A Fig. 31 Fig. 32 Fig. 33 Fig. 34 Steel ball 5.0 Leaf spring Leaf spring Flat washer 24 Flat washer 24 Ring spring 21 Leaf spring (1) Remove ring spring 21. Then, flat washer 24 can be removed from chuck holder. See Fig. 27 and Fig. 28. (2) Remove leaf spring with No.1R212 "Retaining Ring Plier". Then, steel ball 5.0 can be removed from chuck holder. See Fig. 29. If it is difficult to remove leaf spring with No.1R212 "Retaining Ring Plier", slightly knock the change cover to the working table several times. Then, leaf spring can be removed. See Fig. 29A. (3) Remove keyless drill chuck with spacer and change ring from change cover. See Fig. 30. (4) Remove torsion spring 31 from chuck holder. See Fig. 31. (5) Remove spacer from chuck holder. See Fig. 32. (6) Remove flat head screw M6x22 by tuning it clockwise. See Fig. 33. (7) Remove keyless drill chuck 13 by tuning it counter clockwise. See Fig. 34. Change cover Keyless drill chuck Spacer Spacer Change ring Change cover Torsion spring 31 Keyless drill chuck Chuck holder Hold this part with vise firmly for easy removing of keyless drill chuck. Keyless drill chuck 13 Flat head screw M6x22

< 7 > Disassembling change lever (1) Separate cap from change lever. See Fig. 35. (1) Apply grease to the pin of change lever and O ring 17. Refer to "< 2 > Lubrication to the machine parts" in page 3. < Note > Be careful, not to lose lock button and compression spring 3. They can easily spring off. (2) Fully turn change lever in the direction of drill mode. Then, change lever can be pulled out from gear housing. See Fig. 36. < 8 > Assembling change lever Fig. 36 Fig. 37 Fig. 38 Fig. 39 Cap Gear housing Cap Gear housing Gear housing Lock button Compression spring 3 Fig. 35 Fig.36F Change lever O ring 17 (2) Assemble compression spring 3 and lock button to change lever. And temporarily assemble cap to the position illustrated in Fig. 37 in order to stop springing off of lock button. Do not forget to assemble O ring 17. See Fig. 37. (3) Insert the change lever in which compression spring 3 and lock button have been temporarily fixed with cap, into the assembling hole of gear housing. See Fig. 38. The change lever can not be inserted completely in this stage. (4) Pressing the change lever, turn it in the direction of drill mode. Then, it can be inserted completely in any position of area B. See Fig. 39. (5) Turn the change lever to the area C. See Fig. 39. And assemble cap completely to the original position of change lever, by pressing to gear housing side. Cap Change lever Change lever Change lever Compression spring 3 Lock button Cap, assembled temporarily Cap assembled completely by pressing. Lock button Lock button Compression spring 3 O ring 17 A Insert the change lever within the area A. B If the change lever can not be inserted completely in any position of area B, pressing lock button, turn it to the direction of drill mode again in order to insert completely in any position of area B. C Compression spring 3

< 9 > Disassembling armature Fig. 40 Fig. 41 Fig. 42 Fig. 43 1. Remove handle cover by unscrewing 3 pcs. of tapping screw 4 x 45. And remove carbon brushes as illustrated in Fig. 40. 2. Separate gear housing together with armature, from motor housing by unscrewing 4 pcs. of tapping screw 4 x 45 as illustrated in Fig. 41. 3. Slightly hitting the edge of gear housing with plastic hammer, remove armature from inner housing assembled in gear housing. See Fig. 42. 4. Ball bearings of fan side and commutator side can be removed with No.1R269 "Bearing extractor (small)". See Fig. 43. Carbon brush Carbon brush Handle cover Tapping screw 4 x 25 : 3 pcs. Tapping s crew 4 x 45 : 4 pcs. Brush holder Brush holder Gear housing Motor housing Gear housing Inner housing Plastic hammer No.1R269 "Bearing extractor (small)" Ball bearing Armature Inner housing Plastic hammer

< 10 > Disassembling tool holder guide section ( 1 ) After removing change lever ( See page 9), separate gear housing from motor housing as illustrated in Fig. 40 and Fig. 41 in page 10. ( 1 ) Apply grease to spur gear 51 and tool holder guide referring to "< 2 > Lubrication to the machine parts" in page 3. ( 2 ) Mount spur gear 51, compression spring 32 and washer 31. See Fig. 48. ( 3 ) Pressing the washer 31 toward the spur gear 51 side, with arbor press, mount ring spring 29 as illustrated in Fig. 47 and Fig. 46. And mount flat washer 28 to the position illustrated in Fig. 45. ( 4 ) Insert piston cylinder of swash bearing section into tool holder guide. And insert tool holder section into inner housing as illustrated in Fig. 45. ( 2 ) Remove inner housing as illustrated in Fig. 44. ( 3 ) Separate tool holder guide section from inner housing. See Fig. 45. ( 4 ) Remove ring spring 29, while pressing washer 31 which covers ring spring 29, toward the spur gear 51 side. See Fig. 46 and 47. After removing ring spring 29, reduce pressure on the washer 31 slowly. ( 5 ) Remove washer 31, compression spring 32 and spur gear 51 form tool holder guide. See Fig. 48. < 11 > Assembling tool holder guide section Fig. 44 Fig. 45 Fig. 46 Fig. 47 Fig. 48 Washer 31 Ring spring 29 Round bars for arbor Retaining ring plier No. 1R306 Ring spring extractor Tool holder guide section Tool holder guide section Swash bearing section Swash bearing section Piston cylinder Inner housing Flat washer 28 Washer 31 Ring spring 29 Retaining ring plier Washer 31 Spur gear 51 Tool holder guide Compression spring 32 Inner housing

< 12 > Disassembling impact bolt ( 1 ) Referring to "< 10 > Disassembling tool holder guide section" in page 11, remove ring spring 29, washer 31, compression spring 32 and spur gear 51 from tool holder guide. See Fig. 44, 45, 46, 47 and Fig. 48. ( 2 ) Push the cut portion of ring spring 28 to the out side of the hole as illustrated in Fig. 49 and Fig. 49A. Tool holder or Chuck holder side Tool holder or Chuck holder side Inner housing side Ring spring 28 showing its cut portion Ring spring Push the cut portion to the out side of the hole. Push out ring spring 28 from the inner groove. O ring case O ring case Inner housing side Inner housing side 3. Hold tool holder with "No.1R038 Armature holder" and vise. Insert screwdriver between ring spring 28 and O ring case. and push out ring spring 28 from the inner groove as illustrated in Fig. 50. Inner housing side Cap 35 side O ring case Inner groove of tool holder Ring spring 28 off from inner groove Vise No.1R038 Armature holder Fig. 49 Fig. 49A Tool holder or Chuck holder side Fig. 50 Impact bolt X ring Sleeve 9 Ring 10 O ring case Ring spring 28

4. Insert "No.1R236 Round bar for arbor" and push the inner parts of tool holder guide as deep as possible toward the inner housing side. See Fig. 51 5. Pick up ring spring 28 with plier and take off it from tool holder guide as illustrated in Fig. 52. 6. The following parts can be removed from tool holder guide as illustrated in Fig. 53. * O ring case with O ring 9 * O ring 15 * Ring 10 * Impact bolt * Sleeve 9 * X ring 9 Fig. 51 Fig. 52 Fig. 53 Ring spring 28 X ring 9 Sleeve 9 Impact bolt Ring 10 O ring case with O ring 9 Tool holder guide O ring 15 Fig. 52 < 13 > Assembling impact bolt 1. Apply grease to the following parts referring to "< 2 > Lubrication to the machine parts" in page 3 * Tool holder guide * X ring 9 * O ring 15 2. Insert X ring 9, sleeve 9, impact bolt, ring 10, O ring 15 and O ring case with O ring 9 into tool holder. 3. Assemble ring spring 28 to the inner groove of tool holder by pushing it with screwdriver. Ring spring 28 has to be mounted as illustrated in Fig. 53. O ring case O ring 9 Ring spring 28 Ring 10 Impact bolt < Note > Do not install the used ring spring 28. Always mount the fresh one. * O ring 9 to be mounted to the O ring box Sleeve 9 X ring 9 O ring 15

< 14 > Disassembling swash bearing (1) Referring to at page 6, disassemble the product in the order of Fig.40, Fig.41, Fig.42, Fig.44 and Fig. 45 in page 10 and 11. And separate inner housing together with tool holder section and swash bearing section from gear housing as illustrated in Fig. 54. Ball baring 606ZZ can remain in gear housing in this stage. If so, refer to Fig. 59 at page 15. (2) Separate tool holder section from inner housing as illustrated in Fig. 55. Inner housing Plastic hammer Tool holder section Inner housing Inner housing Tool holder section Flat washer 28 Piston cylinder Swash bearing section Swash bearing section Fat washer 5 Compression spring 6 Stop ring E-4 Pin of inner housing Piston cylinder (3) Remove stop ring E-4, flat washer 5 and compression spring 6 with which change plate is fixed, from the pin of inner housing as illustrated in Fig. 56. (4) Swash bearing section is held in inner housing with bearing retainer which is fastened with 2 pcs. of hex socket head bolts M4x12. Take off these hex socket head bolts M4x12 for disassembling swash bearing section. See Fig. 57. (5) Bring piston cylinder to the dead point. And , twist the the swash bearing section, while pulling off them from inner housing. Then swash bearing section and change plate can be removed from piston cylinder. See Fig. 58. Hex socket head bolts M4x12 *Ball bearing 606ZZ Piston cylinder Change plate Change plate Fig. 54 Fig. 55 Fig. 56 Fig. 57 Fig. 58

(6) Reassemble swash bearing section temporarily to gear housing, and hold gear housing as illustrated in Fig. 59. So, swash bearing section tilts in the direction of arrow. Keeping the illustrated position, remove swash bearing section by striking the edge of gear housing with plastic hammer. So, ball bearing 606ZZ can be removed together with swash bearing section. (7) Swash bearing section can not be disassembled in one action by pressing cam shaft with arbor press, because retaining ring S-7 is mounted between ball bearing 606ZZ and compression spring 7. Take the following steps for disassembling swash bearing section. 1. Remove ring 8 by pressing cam shaft with arbor press as illustrated in Fig. 60. 2. Remove ball bearing 608ZZ with bearing extractor as illustrated in Fig. 61. Then flat washer 8 and bearing retainer can be removed from cam shaft. 3. Remove helical gear 26 by pressing cam shaft with arbor press as illustrated in Fig. 62. 1R022 Bearing extractor plate 1R023 Bearing extractor ring Ring 8 Ring 8 1R236 Round bar for arbor 1R236 Round bar for arbor Ball bearing 608ZZ Flat washer 8 Bearing retainer Helical gear 26 Helical gear 26 Swash bearing 10 Clutch cam Ball bearing 606ZZ Retaining ring S-7 Compression spring 7 Spur gear 10 Cam shaft 4. Remove swash bearing 10 and clutch cam as illustrated in Fig. 63. And remove ball bearing 606ZZ with bearing extractor as illustrated in Fig. 63. 5. Disassemble retaining ring S-7 with retaining ring plier as illustrated in Fig. 64. 6. Separated compression spring 7 and spur gear 10 from cam shaft as illustrated in Fig. 65. Fig. 59 Fig. 60 Fig. 61 Fig. 62 Fig. 63 Fig. 64 Fig. 65

< 15 > Assembling swash bearing section < 16 > Assembling swash bearing section to piston cylinder (1) Apply grease to the parts of swash bearing section referring to "< 2 > Lubrication to the machine parts" in page 3. (2) Assemble swash bearing 10 by pressing cam shaft with arbor press as illustrated in Fig. 66. (3) Assemble helical gear 26 by pressing cam shaft with arbor press as illustrated in Fig. 67. (4) Assemble flat washer 8, bearing retainer and ball bearing 608ZZ by pressing cam shaft with arbor press as illustrated in Fig. 68. (5) Assemble ring 8 by pressing cam shaft with arbor press as illustrated in Fig. 69. Swash bearing 10 Helical gear 26 Cam shaft Flat washer 8 Ball bearing 608ZZ Bearing retainer Ring 8 (1) Apply MAKITA grease to piston cylinder and swash bearing 10 referring to "< 2 > Lubrication to the machine parts" in page 3. (2) Mount 2 pcs. of flat washer 12 and piston joint to piston cylinder as illustrated in Fig. 70. (3) Insert the above piston cylinder into inner housing as illustrated in Fig. 71. (4) Bringing piston cylinder to the dead point for swash bearing 10, mount swash bearing 10 to piston cylinder by inserting its pole into the hole of piston joint as illustrated in Fig. 72. (5) Fasten bearing retainer which has been assembled to swash bearing section, with adhesive hex socket head bolt M4x12, onto inner housing as illustrated in Fig. 73. Flat washer 12 Flat washer 12 Piston joint Piston cylinder Piston cylinder Inner housing 2 pcs. of Hex socket head bolts M4x12 for tightening bearing retainer. Do not fasten with the used hex socket head bolt M4x12. Always use the fresh adhesive hex socket head bolt M4x12 Fig. 66 Fig. 67 Fig. 68 Fig. 69 Fig. 70 Fig. 71 Fig. 72 Fig. 73 No.1R034 Bearing setting plate

Clutch cam Clutch cam Change plate Cam shaft Change plate Spur gear 10 Clutch cam Change plate Compression spring 7 Compression spring 6 Spur gear 10 Retaining ring S-7 (6) Set change plate in the groove of clutch cam, and assemble the clutch cam with change plate to cam shaft as illustrated in Fig. 74. (7) Assemble spur gear 10 to cam shaft as illustrated in Fig. 75. (8) Assemble compression spring 7 to cam shaft, and secure the parts on cam shaft with retaining ring S-7 as illustrated in Fig. 76. (9) Assemble compression spring 6 and flat washer 5 to the pin of inner housing. And secure them with stop ring E-5 as illustrated in Fig. 77. (10) Apply 55g of MAKITA grease RA No.1 in gear housing. Flat washer 5 Stop ring E-5 < 17 > Removing needle bearing complete Strike the work table with gear housing. Then needle bearing complete can be separated from gear housing as illustrated in Fig. 78. Needle bearing complete Fig. 74 Fig. 75 Fig. 76 Fig. 77 Fig. 78

< 18 > Assembling needle bearing complete 1. Apply MAKITA grease RA No.1 to the inside of needle baring complete. 2. Putting needle bearing complete on No.1R165 "Ring spring setting tool B" press gear housing onto the needle bearing complete with arbor press as illustrated in Fig. 79. < 19 > Replacing electrical parts in handle Disassemble handle cover by unscrewing 3 pcs. of tapping screws 4x25, and disassemble strain relief by unscrewing 2 pcs. of tapping screws 4x18 as illustrated in Fig.80. Then, switch, noise suppressor, power supply cord, etc. can be replaced. No.1R165 Ring spring setting tool B Needle bearing complete Gear housing < Note in assembling > Pay attention to the assembling position of needle bearing complete. The fat portion of needle bearing complete has to be faced to the belly side of gear housing. Belly side Needle bearing complete. Flat portion of needle bearing complete Belly side Back side Tapping s crew 4 x 25 : 3 pcs. Handle cover Brush holder Brush holder Switch Noise suppressor Power supply cord Cord guard Strain relief Tapping screw 4x18 : 2 pcs. < 18 > Maintenance It is recommended to change the following parts, when replacing carbon brushes. See Fig. 81. Steel ball 7.0 O ring 12 O ring 15 O ring 16 O ring 9 Fig. 79 Fig. 80 Fig. 81

Color index of lead wires Black White Red Blue Clear 1 2 3 4 1 2 C1 C2 M1 M2 Switch Field Noise suppressor Power supply cord Brush holder Brush holder Connected to field ore For some countries, noise suppressor of two lead wire type is used, or noise suppressor is not used. LED job light Blue or red Light circiut HR2450FT

Fix field lead wire (black) with lead holder as per the illustration. Fix field lead wire (black) with lead holder as per the illustration. Fix noise suppressor's lead wire (clear) with lead holder as per the illustration. Fix brush holder's lead wire (red) and field lead wire (white) with lead holder as per the illustration. * Do not slack brush holder's lead wire (red) between brush holder and lead holder. Fix brush holder's lead wire (blue) and field lead wire (black) with lead holder as per the illustration. * Pass brush holder's lead wire (blue) under the field lead wire (black). * Do not slack brush holder's lead wire (blue) between brush holder and lead holder. Fix field brush holder's lead wire (blue) and field lead wire (black) with lead holder as per the illustration. Fix lead wires which are passed through this area, with any of these lead holders. Noise suppressor Noise suppressor is not used in some countries Fix the following lead wires with this lead holder. * Brush holder's lead wire (red) * 2 field's lead wires (black) * Noise suppressor's lead wire (clear) Bottom view of handle portion Lead wires of power supply cord, and grounding lead wire (clear) LED lead wires (blue or red) Noise suppressor LED circuit Pass LED lead wires, lead wires of power supply cord and grounding lead wire as illustrated above. LED circuit Fix lead wire (white) of LED job-light with lead holder as illustrated. LED job-light LED job-light HR2450FT

Color index of lead wires Black White Red Blue Clear 1 2 3 4 1 2 C1 C2 M1 M2 Switch Field Noise suppressor Power supply cord Brush holder Brush holder Connected to field ore For some countries, noise suppressor of two lead wire type is used, or noise suppressor is not used. HR2450T

Fix field lead wire (black) with lead holder as per the illustration. Fix field lead wire (black) with lead holder as per the illustration. Fix noise suppressor's lead wire (clear) with lead holder as per the illustration. Fix brush holder's lead wire (red) and field lead wire (white) with lead holder as per the illustration. * Do not slack brush holder's lead wire (red) between brush holder and lead holder. * Put the brush holder lead wire (red) under the field lead wire (white). Fix brush holder's lead wire (blue) and field lead wire (black) with lead holder as per the illustration. * Pass brush holder's lead wire (blue) under the field lead wire (black). * Do not slack brush holder's lead wire (blue) between brush holder and lead holder. Fix field brush holder's lead wire (blue) and field lead wire (black) with lead holder as per the illustration. Fix lead wires which are passed through this area, with any of these lead holders. Noise suppressor Noise suppressor is not used in some countries Fix the following lead wires with this lead holder. * Brush holder's lead wire (red) * 2 field's lead wires (black) * Noise suppressor's lead wire (clear) HR2450T