User manual MAKITA EH760 SERVICE MANUAL

[. . . ] Starting procedure 2 Checkup and adjustment of carburetor STARTING TEST Checkup and adjustment (Refer to IX. TROUBLESHOOTING) NOTE: The numbers are the same as those in this manual. 5 b. Cautions 1) Preparations (1) Workbench (2) Disassembly and reassembly kits and gauges (3) Washing bowl (4) Rinse oil (light oil, gasoline, etc. ) (5) Oil (mobile oil), grease (6) Adhesive, sealant (7) File, sandpaper (8) Shop cloth 2) Cautions in Disassembly (1) Use standard tools correctly. (2) Handle disassembled parts with care and be sure to clean them. In particular, remove dust or dirt adhering to the mounting surfaces of packings. [. . . ] Flywheel Install the socket head bolt onto the crankshaft and tighten them securely. During assembly, be sure first that you have the crankshaft key slot properly aligned with before installing. Crankcase When assembling the crankcase, cut off the crankcase gasket sticking out from the cylinder installing surface. Cylinder When assembling the cylinder, coat both the cylinder inner surface and the piston itself with 2-cycle engine oil. 17 9. Piston When equipping the piston in the crankshaft ass'y, the triangular mark ( A ) on the top of the position should be on the crankshaft key slot side. 10. Piston ring When installing the piston ring on the position, align the knock pin on the piston with the split on the piston ring. Unless they are lined up the cylinder cannot be assembled. 18 d. Disassembly & Assembly of Carburetor 1) Function of Parts 19 (1) Throttle Valve (2) Tamper Resistant Plug: (3) Low-Speed Needle: (4) Inlet Screen: (5) Needle Valve: (6) Fuel Inlet: (7) Metering Lever Spring: Controls engine output. Works together with metering diaphragm to ensure constant pressure in metering chamber. Works up or down depending on difference of pressure inside engine and atmospheric pressure so as to open or close the needle valve through the metering lever and metering spring. Allows excess fuel to return to the tank during primer pump operation. Takes the negative or positive pressure building up in the crankcase under piston operation and makes the fuel pump diaphragm work accordingly. Prevents air in the nozzle from entering the metering chamber when the primer pump is being worked. Daily Checkup and Adjustment 1. Aspect Confirm that there is no damage or wear. 2. Bolts, nuts, damper pin Check bolts and nuts for damage, wear or tightening. Confirm that the safety cover is mounted in contact with gearcase. 4. Cleaning of dirt, dust or saw dust 1) Crankcase If there is any dust or dirt adhering to cooling air inlet, fan cover-cylinder fins, etc. 2) Cylinder If there is any dust or dirt adhering to cylinder fin, detach cylinder cover and remove it. 7. Throttle lever Confirm that throttle lever can be operated smoothly. Muffler, Muffler cover Check muffler and muffler cover for damage or loosening. Operating and rotating parts Check operating parts for abnormality and rotating parts for abnormal noise. 25 b. Air cleaner Remove cover of air cleaner and cleaner filter inside with gasoline. [. . . ] Replace -Overheated engine - Air ventilation hamperedbecause of cylinder clogged with dust . Clean (Inlet of cooling air, fan cover, fan, cylinder fin) Overhaul, clean Overhaul, clean - Carbon adhering to combustion chamber . Lessen load Defective -ignition function Damaged or fouled spark plug or inadequatespark gap . Replace, clean, adjust Irregular adjustmentof low-speed fuel adjusting screws . [. . . ]