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Makita EM4351UH manual

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Table of contents for the manual

  • Page 1

    PRODUCT P 1/ 2 2 Straight unleaded gasoline Yes 43.0 (2.6) Models No. Description C ONCEPT AND MAIN APPLICATIONS S pecification S tandard equipment O ptional accessories EM4350UH, EM4350LH EM4351UH Petrol Brushcutter Primer pump Engine Displacement: cm³ (cu.in.) Fuel 4-stroke Specifications EM4350LH Model Type Loop handle Handle style Engine oil C[...]

  • Page 2

    CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”. [4] DISASSEMBL Y/ASSEMBL Y [4]-1. W arning Follow the instructions described below in advance before repairing: • Wear gloves. • Remove the cutting tool from the unit, and if it is a saw blade, attach the blade cover to the blade. • When the [...]

  • Page 3

    [4] DISASSEMBL Y/ASSEMBL Y [4]-2. Engine and Shaft R epair P 3 / 2 2 (1) Press down the tab of Cleaner plate assembly gently and separate Cleaner cover assembly from Cleaner plate assembly by loosening M5x20 Hex socket head bolt. ( Fig. 1 ) (2) Loosen 5x16 Tapping screw and loosen Clamp that holds Bullet terminals near Cleaner plate assembly. ( Fig[...]

  • Page 4

    [4] DISASSEMBL Y/ASSEMBL Y [4]-2. Engine and Shaft (cont.) R epair P 4 / 2 2 Assemble by reversing the disassembly procedure. (1) Put Cable bracket between Flat washer 6 and middle Nut, and tighten them by turning lower nut, upper nut and the middle nut. ( Fig. 7 ) (2) Put Stopper on Inner cable end into Swivel, then adjust the above nuts so that 3[...]

  • Page 5

    [4] DISASSEMBL Y/ASSEMBL Y [4]-3. Shaft pipe complete (cont.) R epair P 5 / 2 2 For 4351UH: (5A) Loosen M5x18 Hex socket head bolt and remove Shaft pipe complete from Pipe housing. ( Fig. 11 ) (6A) Pull out Shaft from Shaft pipe complete. For 4350UH: (5B) Remove two M6x25 Hex socket head bolts and Pipe clamp, then separate Bike handle section from [...]

  • Page 6

    [4] DISASSEMBL Y/ASSEMBL Y [4]-3. Shaft pipe complete (cont.) R epair P 6 / 2 2 For 4351UH: (1A) Insert Buffer rubber into Pipe housing so as to align the two grooves with the two ribs ( Fig. 16 ) Set the four Buffer rubbers in place of Pipe housing. ( Fig. 17 ) (2A) Insert two projections of Clutch case into Buffer rubbers. Insert two projections [...]

  • Page 7

    [4] DISASSEMBL Y/ASSEMBL Y [4]-4. Gear case assembly R epair P 7 / 2 2 (1) According to the clause of [4]-3 , Remove Gear case assembly. (Refer to Figs. 8, 9 and 10 ) (2) Remove M8x10 + Hex bolt from the grease inlet of Gear case assembly. ( Fig. 19 ) (3) Remove Retaining ring R-26 with 1R006. ( Fig. 20 ) (4) Remove an assembled part of Spiral beve[...]

  • Page 8

    [4] DISASSEMBL Y/ASSEMBL Y [4]-4. Gear case assembly (cont.) R epair P 8 / 2 2 Assemble by reversing the disassembly procedure. Note: • Make sure that O ring 32 is put into the inner groove of Gear case assembly in advance. • When mounting Cutter shaft complete into Gear case assembly, press-fit them together using arbor press and 1R028 as show[...]

  • Page 9

    [4] DISASSEMBL Y/ASSEMBL Y [4]-6. Clutch drum R epair P 9 / 2 2 For 4351UH : Refer to Parts breakdown in Fig. 35 . (1A) Remove four M6x20 Hex socket head bolts, then separate Clutch case from Engine. ( Fig. 33 ) (2A) Remove Retaining ring (INT) R-42 in Clutch case with 1R006. ( Fig. 33 ) (3A) Put 1R247 on Clutch drum in Clutch case, press down Clut[...]

  • Page 10

    [4] DISASSEMBL Y/ASSEMBL Y [4]-6. Clutch drum (cont.) R epair P 1 0 / 2 2 For 4351UH : (1) Press-fit Ball bearing 6004LLU to Clutch drum with 1R031 in Fig. 40 . Note : Put Retaining ring (INT) R-42 between Ball bearing 6004LLU and Clutch drum in advance. (2) Set Retaining ring (EXT) WR-20 in the groove on Clutch drum. (3) Put Clutch case on the tab[...]

  • Page 11

    [4] DISASSEMBL Y/ASSEMBL Y [4]-7. Ignition system R epair P 1 1 / 2 2 (1) Remove Plug cap from Spark plug, then check the continuity between Plug cap spring and the ground (earth) terminal of Ignition coil with a circuit tester. If there is normal continuity, the resistance value will be 2.0 kΩ± 0.5 kΩ. ( Fig. 44 ) (2) If there is no or intermit[...]

  • Page 12

    [4] DISASSEMBL Y/ASSEMBL Y [4]-7. Ignition system (cont.) R epair P 1 2 / 2 2 (1) Before removing Ignition coil, separate Cylinder cover from Engine, and pull out Primary wire from Ignition coil in advance. ( Fig. 47 ) (2) Remove two M4x20 Hex socket head bolts and Ignition coil from Engine. ( Fig. 47 ) Note : Be careful to the torque to loosen the[...]

  • Page 13

    [4] DISASSEMBL Y/ASSEMBL Y [4]-9. Recoil starter R epair P 1 3 / 2 2 (1) Remove Starter cover assembly by loosening four M5x20 Hex socket head bolts. ( Fig. 52 ) (2) Pull Starter rope out of Starter cover assembly approximately one winding long. Then hook Starter rope on the U-shaped notch of Reel, and then turn Reel clockwise until Spiral spring i[...]

  • Page 14

    [4] DISASSEMBL Y/ASSEMBL Y [4]-10. Carburetor section R epair P 1 4 / 2 2 (1) Press down the tab of Cleaner plate assembly gently and separate Air cleaner cover from Cleaner plate assembly by loosening M5x20 Hex socket button head screw. ( Fig. 1 of [4]-2. ) (2) Remove Air cleaner element. ( Fig. 58 ) (3) Remove two M5x60 Hex socket head bolts that[...]

  • Page 15

    [4] DISASSEMBL Y/ASSEMBL Y [4]-10. Carburetor section (cont.) R epair P 15 / 2 2 Fig. 67 Fig. 69 Fig. 68 Tube 3-250 (black)* between Carburetor and Fuel tank *The component of Tube complete Tube 3-120 (blue) between Primer pump and Carburetor Tube 3-35 between Carburetor and Insulator complete ASSEMBLING CARBURETOR Assemble by reversing the disasse[...]

  • Page 16

    R epair P 16 / 2 2 Fig. 71 Fig. 72 Fig. 73 Fig. 70 [4] DISASSEMBLY/ ASSEMBLY [4]-11. Stop switch section CHECKING STOP SWITCH FUEL TUBE ROUTING Check the continuity between the bullet terminals on the two lead wires extending from Control lever with a circuit tester. ( Fig. 70 ) If Stop switch functions properly, there will be no continuity with th[...]

  • Page 17

    [4] DISASSEMBLY/ASSEMBLY [4]-13. Engine block R epair P 17 / 2 2 (1) It is highly recommended to drain the oil system of Engine block before starting disassembling because the oil remaining there will drip out to delay your operation. (2) From the engine section, remove the following parts): Ignition coil, Flywheel complete, Rocker cover inner, Roc[...]

  • Page 18

    [4] DISASSEMBL Y/ASSEMBL Y [4]-13. Engine block (cont.) R epair P 18 / 2 2 ASSEMBLING (1) Connect Piston with Crank shaft complete by inserting Piston pin into place; there is no front/back to Piston. Note: Be sure to apply a little amount of Makita grease N No.2 to Needle roller bearing. (2) Secure Piston pin by mounting Clip onto each end of Pist[...]

  • Page 19

    [4] DISASSEMBL Y/ASSEMBL Y [4]-13. Engine block (cont.) R epair P 19 / 2 2 (8) Adjust Valve clearance as follows: 1. Align the marks on the following parts: • Ignition coil and Flywheel complete ( Fig. 81 ) • Cam gear assembly and Cylinder block ( Fig. 82 ) 2. Set two Cam lifters and two Rods 2.5 in place, then assemble two Rocker arm assemblie[...]

  • Page 20

    [4] DISASSEMBL Y/ASSEMBL Y [4]-13. Engine block (cont.) R epair P 2 0 / 2 2 Assemble by reversing the disassembly procedure. (1) Remove two Rocker arm assemblies and Pin 5 from Cylinder block assembly. ( Fig. 89 ) (2) Push a rag into Cylinder block assembly from the bottom side so as not to fall off Intake valve and Exhaust valve. The rag works as [...]

  • Page 21

    R epair P 2 1 / 2 2 [4] DISASSEMBL Y/ASSEMBL Y [4]-14. V alve section (cont.) ASSEMBLING (1) Apply 0.05cc of 4-cycle engine oil to Exhaust valve and Intake valve as drawn in Fig. 92 , then insert them into the holes in Cylinder block assembly. ( Fig. 93 ) (2) Push a rag into Cylinder block assembly so as not to fall off Intake valve and Exhaust val[...]

  • Page 22

    [4] DISASSEMBL Y/ASSEMBL Y [4]-15. T ightening torque specifications R epair P 2 2 / 2 2 Application (for fastening A and B) A B Fastener Tightening torque (N.m) Crank case Retainer plate M5x18 Hex socket head bolt 6.0 Cylinder block Crank case M6x25 Hex socket head bolt (8 pcs.) 11.0 Crank case Oil case M5x18 Hex socket head bolt (4 pcs.) 6.0 Flyw[...]