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Makita EK7651H manual

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Table of contents for the manual

  • Page 1

    PRODUCT C ONCEPT AND MAIN APPLICA TIONS S pecification P 1/ 19 Models No. EK7650H, EK7651H Description Power Cutters 305mm (12"), 355mm (14") Models EK7650H and EK7651H are the world’ s first 4-stroke power cutters. Their main features are: • Low fuel consumption, low noise and clean exhaust emission achieved by 4-stroke engine • Ea[...]

  • Page 2

    [1] NECESSARY REPAIRING TOOLS Description Code No. Use for Retaining ring pliers ST-2N for External ring 1R003 press-fitting Ball bearing 6203LLU into Cutting device Bearing setting pipe 25-17.2 1R030 assembling Clutch complete to Crankshaft Torque wrench shaft 20-90N·m 1R223 CAUTION: Repair the machine in accordance with “Instruction manual” [...]

  • Page 3

    Description Item No. Use for Amount a little a little a little Lubricant 4-cycle Engine oil (API grade SM class) 4-cycle Engine oil (API grade SM class) Makita grease N No. 2 [3] LUBRICANT/ ADHESIVE APPLICATION Retainer (2 pcs.) Contact surface with the holes of Rocker arm assembly Contact surface with the inner periphery of Valve guide Contact sur[...]

  • Page 4

    Hood section V belt 5-800 Cutting device [4] DISASSEMBLY/ASSEMBLY [4]-1. V-belt 5-800, Cutting device R epair P 4 / 19 (1) Loosen two M8 Hex nuts slightly with Wrench 13-16 of a standard accessory. ( Fig. 2 ) (2) Release the tension on V-belt 5-800 by turning M6 Tensioning screw counterclockwise with Screwdriver. The position of M6 square nut shows[...]

  • Page 5

    [4] DISASSEMBLY/ASSEMBLY [4]-1. V-belt 5-800, Cutting device (cont.) R epair P 5 / 19 Assemble their parts by reversing the disassembly procedure. (1) Assemble one of Ball bearing 6203LLU to Cutting holder, then snap Retaining ring R-40 into the groove of Cutting device to secure the bearing. (2) Insert Spindle into the other Ball bearing 6203LLU, [...]

  • Page 6

    [4] DISASSEMBLY/ASSEMBLY [4]-2. Starter assembly R epair P 6 / 19 (1) Loosen three M5x19 - Hexalobular socket head bolts, then remove Starter assembly. ( Fig. 10 ) (2) When Starter rope is not broken; 1. Make a slack of Starter rope then hook it on U-shaped notch of Reel. ( Fig. 11 ) 2. Be sure to loosen the spiral spring force by turn Reel clockwi[...]

  • Page 7

    [4] DISASSEMBLY/ASSEMBLY [4]-3. Clutch, Ratchet R epair P 7 / 19 (1) Remove Cutting device. Refer to the clause of [4]-1 . (2) Loosen three M5x12 Hexalobular socket head bolts, then remove Clutch cover together with Starter assembly. ( Fig. 16 ) (3) Loosen three M5x16 Hexalobular socket head bolts with 1R290 and Cordless impact driver, and remove R[...]

  • Page 8

    [4] DISASSEMBLY/ASSEMBLY [4]-4. Flywheel, Ignition coil R epair P 8 / 19 (1) Loosen four M5x30 - Hexalobular socket head bolts, then remove Fan cover. ( Fig. 22 ) (2) Remove M10 Flange nut from Crankshaft by turning counterclockwise by using Cordless impact driver with 14mm flats width Socket bit. ( Fig. 23 ) (3) Mount 1R364 on Flywheel complete, t[...]

  • Page 9

    [4] DISASSEMBLY/ASSEMBLY [4]-4. Flywheel, Ignition coil (cont.) R epair P 9 / 19 DISASSEMBLING IGNITION COIL Fig. 27 Fig. 28 Fig. 29 Fig. 30 Fig. 31 (1) Loosen M6x15 Thumb screw, then remove Top cover. ( Fig. 27 ) (2) Loosen four M5x40 Hexalobular socket head bolts, then remove Filter cover complete ( Fig. 28 ) and Air filter. ( Fig. 29 ) (3) Loose[...]

  • Page 10

    P 1 0 / 19 [4] DISASSEMBLY/ASSEMBLY [4]-5. Carburetor R epair Fig. 32 Fig. 33 Fig. 34 Fig. 35 Fig. 37 Fig. 36 5.5x20 Hexalobular tapping screw (1) After completion of the steps (1) and (2) on [4]-4 , remove Grip cover by loosening 5.5x20 Hexalobular tapping screw. ( Fig. 32 ) (2) Loosen two M5x45 Hexalobular socket head bolts, then remove Carbureto[...]

  • Page 11

    [4] DISASSEMBLY/ASSEMBLY [4]-5. Carburetor (cont.) R epair P 1 1 / 19 ADJUSTMENT OF CARBURETOR AFTER REPLACEMENT ASSEMBLING Fig. 38 Fig. 39 Fig. 40 Pull throttle lever fully after a while engine running at idle position. When there is a problem with the engine quick acceleration, adjust H needle ( Fig. 38 ) as follows: (1) Warm up the engine by pul[...]

  • Page 12

    [4] DISASSEMBLY/ASSEMBLY [4]-6. Throttle lever R epair P 1 2 / 19 DISASSEMBLING DISASSEMBLING Fig. 42 Fig. 43 Fig. 44 (1) Remove Pin 5 from the grooves on Tank complete by levering it up with a slotted screwdriver. ( Fig. 42 ) (2) Expand the hinge portion for Throttle lever on Tank complete with 1R003. ( Fig. 43 ) Throttle lever section can be remo[...]

  • Page 13

    [4] DISASSEMBLY/ASSEMBLY [4]-7. Engine block (cont.) R epair P 1 3 / 19 DISASSEMBLING Fig. 46 Fig. 47 (6) Remove four M6x30 Hexalobular socket head bolts that fasten Front handle, Tank complete and Engine. ( Fig. 46 ) Engine block can be removed. ( Fig. 47 ) [Viewed from Blade installation side] [Viewed from Starter assembly installation side] Engi[...]

  • Page 14

    [4] DISASSEMBLY/ASSEMBLY [4]-8. Engine R epair P 1 4 / 19 DISASSEMBLING Fig. 48 Fig. 49 (1) Remove Clutch complete and Clutch drum. Refer to [4]-3 . (2) Remove Flywheel. Refer to [4]-4 . If necessary, remove Ignition coil. (3) Loosen five M6x25 Hexalobular socket head bolts, then remove Cutting arm from Cylinder block complete. ( Fig. 48 ) (4) Remo[...]

  • Page 15

    [4] DISASSEMBLY/ASSEMBLY [4]-8. Engine (cont.) R epair P 1 5 / 19 DISASSEMBLING Fig. 54 Note : Cam gear assembly functions as automatic decompression valve system. Valve is slightly open to release the compressed air in Engine at the starting time, before moving fly weight by centrifugal effects. It means the insufficient setting of Cam gear assemb[...]

  • Page 16

    [4] DISASSEMBLY/ASSEMBLY [4]-8. Engine (cont.) R epair P 1 6 / 19 DISASSEMBLING Fig. 58 M6x30 Hexalobular socket head bolt (8 pcs.) Cylinder block Slotted screwdriver Cylinder block Top ring Second ring Oil ring Piston Piston pin Ring spring 12 Crankshaft complete* Flat washer 41 Oil seal L *The components cannot be supplied individually. Ring spri[...]

  • Page 17

    [4] DISASSEMBLY/ASSEMBLY [4]-8. Engine (cont.) R epair P 1 7 / 19 Note: Be sure to apply Makita grease N No.2/ 4-cycle engine oil in accordance with [3] LUBRICANT APPLICATION . (1) Connect Piston with Crankshaft complete by inserting Piston pin into place; there is no front/back to Piston. (2) Secure Piston pin by mounting Ring spring 12 onto each [...]

  • Page 18

    [4] DISASSEMBLY/ASSEMBLY [4]-8. Engine (cont.) R epair P 18 / 19 DISASSEMBLING Fig. 68 (8) Assemble Cam gear section by reversing the disassembly procedure. (Refer to Fig. 53 and 52 .) (9) Move Piston to the upper dead point in Cylinder block by turning Crankshaft slowly and carefully by hand. (10) Adjust the gap between Rocker arms and Exhaust val[...]

  • Page 19

    [5] Tightening torque specifications R epair P 19 / 19 [4] DISASSEMBLY/ASSEMBLY [4]-9. Ignition system (cont.) CHECKING SPARK PLUG (1) Remove Plug cap from Spark plug, then Spark plug from Cylinder head complete with the supplied socket wrench. Note: If the electrodes of Spark plug are wet, wipe them with a rag then dry them with an air blower. (2)[...]