MAKITA EH7500W (01) PDF MANUAL

MAKITA EH7500W (01) PDF SUMMARY:

What should I do if the edges of the blade are rounded and do not cut well anymore?

Grind off only the shaded portions in the figure. Do not grind the contact surfaces (sliding surfaces) of the top and bottom edges.

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What should I do before grinding the blade?

Be sure to secure the blade firmly and switch off the engine and remove the spark plug cap. Wear gloves and protective glasses.

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What should I keep in mind while grinding the blade?

Do not remove too much material. It will lose the hardened layer and cause the blades to get dull very quickly in use.

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How do I adjust the blade clearance?

The upper/lower blades wear. If you cannot get a clean cut though the blades are sharp enough, adjust the clearance as follows:

1. Remove the blunt extension by loosening the screws.
2. Loosen the nut (1) with a box or open-ended wrench.
3. Tighten the truss bolt (2) with a hex wrench lightly till it stops and screw it back a quarter turn.
4. Tighten the nut (1), holding the truss bolt (2).
5. Apply light oil on the friction surface of the blades.
6. Start the engine, operate the throttle on and off for a minute.
7. Measure the time necessary for the blades to stop after releasing the throttle. If it is two seconds or longer, stop the engine and repeat the step 2 to 7.
8. Stop the engine and touch the blade surface. If they are not too hot to touch, you have made a proper adjustment. If they are too hot to touch, turn the truss bolt (2) back a little and repeat the step 6 to 8.
9. Attach the blunt extension by tightening the screws.

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What should I do before making adjustments to the blade?

Stop the engine and wait for the blades to stop. The blades have a slot around screw (2). In case you find dust in the end of any of the slots, clean it.

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How do I check and adjust the idling speed?

The cutting blades should not run when the engine is at idle. Idle speed should be set to 3,000 min-1 (rpm). If necessary, adjust the idle screw (the cutting blades must not run when the engine is on idle).

• The cutting blades run while idling – turn the idle screw counterclockwise to decrease the idle speed.
• The engine stops while idling – turn the idle screw clockwise to increase the idle speed. If the cutting blades still continue to run at idle after the adjustment, consult your nearest authorized service agent.
• The clutch should engage at 3,750 min-1 (rpm) or higher revolution.
• Check the functioning of the I-O switch, the lock-off lever and the throttle lever.

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How do I clean the air cleaner?

Check and clean the air cleaner daily or every 10 operating hours:

1. Turn the choke lever to the close side fully, and keep the carburetor free from dust or dirt.

2. Loosen the fixing bolt.

3. Pull the rear side of the air cleaner cover and move it forward to detach.

4. If oil adheres to the element (sponge), squeeze it firmly.

5. For heavy contamination:

   1. Remove the element (sponge), immerse it in warm water or in water-diluted neutral detergent, and dry it completely.
   2. Clean the element (felt) with gasoline and dry it completely.

6. Before attaching the elements, be sure to dry it completely. Insufficient drying of the elements may lead to difficult startup.

7. Wipe out oil adhering around the air cleaner with waste cloth.

8. Immediately after cleaning is finished, attach the cleaner cover and tighten it with fixing bolts. (In remounting, first place the upper claw.)

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What are the points to consider when handling the air cleaner elements?

• Clean the elements several times a day, if excessive dust adheres to it.
• If operation continues with the elements remaining not cleared of oil, oil in the air cleaner may fall outside, resulting in oil contamination.

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What daily checkup and maintenance should I perform?

To ensure a long service life and to avoid any damage to the equipment, the following servicing operations should be performed at regular intervals:

• Before use;
  • Check the machine for loose screws or missing parts. Pay particular attention to the tightness of the cutter blade screws.
  • Check for clogging of the cooling air passage and the cylinder fins. Clean them if necessary.
  • Clean and check the fuel tank for fuel leakage or foreign object in the tank.
• After use;
  • Clean the hedge trimmer externally and inspect for damage.
  • Clean the air filter. When working under extremely dusty conditions, clean the filter several times a day.

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How do I check the spark plug?

Check and clean the spark plug daily or every 8 operating hours:

• Only use the supplied universal wrench to remove or install the spark plug.
• The gap between the two electrodes of the spark plug should be 0.7 to 0.8 mm. If the gap is too wide or too narrow, adjust it. If the spark plug is clogged with carbon or fouled, clean it thoroughly or replace it. Use an exact replacement.

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How do I supply grease and lubricant?

Supply grease through the grease nipple every 50 operating hours. (Shell Alvania No. 3 or equivalent)

Be sure to observe the specified time and amount of grease supply. Otherwise an insufficient grease supply will cause a machine trouble.

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How do I clean the fuel filter?

Check and clean the fuel filter monthly or every 50 operating hours:

• The felt filter (1) of the suction head is used to filter the fuel required by the carburetor.
• Visually check the felt filter regularly.
• To check the felt filter, open the tank cap, use a wire hook and pull out the suction head through the tank opening. Replace the felt filter if it has hardened, been contaminated or be clogged.

Replace the felt filter at least quarterly to ensure an enough fuel supply to the carburetor. Otherwise an insufficient fuel supply will cause the engine start failure and limited maximum speed.

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How often should I replace the fuel pipe, and what can happen if I don’t?

Replace the fuel pipe every 200 operating hours or every year regardless of operating frequency. Otherwise fuel leakage may lead to fire. If you find any leakage during inspection, replace the oil pipe immediately.

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When should I replace the tank cap?

• If there is any flaw or damage on the tank cap, replace it.
• The tank cap wears out in course of time. Replace it every two or three years.

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How do I store the hedge trimmer for a long time?

When keeping the machine in storage for a long time, drain fuel from the fuel tank and carburetor, as follows:

• Drain all fuel from the fuel tank.
• Remove the spark plug and add a few drops of oil into the spark plug hole. Then, pull the starter gently to confirm that oil film covers inside of the engine and tighten the spark plug.
• Clear dirt or dust from the cutter blade and outside of the engine, wipe them with a oil-immersed cloth and keep the machine at a place as dry as possible.

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What maintenance should I perform after each refueling?

Check the function of the throttle lever and I-O switch.

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What maintenance should I perform before each use?

• Visually check the engine assembly, screws and nuts for damage and tightness.
• Check the general condition and security of the air filter.
• Clean the cooling air duct.
• Check the cutting tool for damage and sharpness.
• Inspect the idling speed (cutting tool must not move).
• Check and clean the fuel tank.

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What maintenance should I perform every 50 hours?

Supply grease to the gear case.

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What maintenance should I perform weekly?

Check the spark plug and replace if necessary.

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What maintenance should I perform yearly?

Replace the fuel pipe.

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What maintenance should I perform biyearly?

Replace the tank cap.

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What should I do with the fuel tank, carburetor, and suction head before long term storage?

• Empty and clean the fuel tank.
• Operate the carburetor until the engine runs out of fuel.
• Replace the suction head.

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What could be the cause if the engine is not starting or is having difficulties?

• Ignition system:
  • Ignition spark is present: Faulty fuel supply or compression system, mechanical defect
  • No ignition spark: I-O switch operated, wiring fault or short circuit, spark plug or connector defective, ignition module faulty
• Fuel supply:
  • Fuel tank filled: Incorrect choke position, carburetor defective, suction head (gas line filter) dirty, fuel supply line bent or interrupted
• Compression:
  • Inside of engine: Cylinder bottom gasket defective, crankshaft seals damaged, cylinder or piston rings defective
  • Outside of engine: Improper sealing of spark plug
• Mechanical fault:
  • Starter not engaging: Broken starter spring, broken parts inside of the engine

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What could be the cause if there are warm start problems?

• Tank filled
• Ignition spark existing
• Carburetor contaminated, have it cleaned

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What could be the cause if the engine starts but dies immediately?

• Fuel supply:
  • Tank filled: Incorrect idling adjustment, suction head or carburetor contaminated
  • Fuel tank vent defective, fuel supply line interrupted, cable or I-O switch faulty

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What could be the cause if there is insufficient performance?

Several systems may simultaneously be affected.

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What could be the cause if the engine is idling?

Air filter contaminated, carburetor contaminated, muffler clogged, exhaust duct in the cylinder clogged.