Hitachi CH 78EC3 (ST) manual Fuel filter Fig, Cleaning the cylinder fins Fig, Cleaning the muffler Fig

NOTE

Lubrication should be applied at 20 hour intervals and more frequently with heavy use.

Fuel filter (Fig. 15)

Remove the fuel filter from the fuel tank and thoroughly wash it in solvent. After that, push the filter into the tank completely.

Fig. 15

NOTE

If the filter is hard due to dust and dirt, replace it.

Cleaning the cylinder fins (Fig. 16)

When leaves get caught between cylinder fins (8), the engine may overheat, resulting in lower output. To avoid this, always keep cylinder fins and fan case clean.

Every 100 operating hours, or once a year (more often if conditions require), clean fins and external surfaces of engine of dust, dirt and oil deposits which can contribute to improper cooling.

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Fig. 16

Cleaning the muffler (Fig. 17)

Remove the muffler and spark arrestor (if so equipped), and clean out any excess carbon from the exhaust port or muffler inlet every 100 hours of operation.

Fig. 17

For long-term storage

Drain all fuel from the fuel tank. Start and let engine run until it stops. Repair any damage which has resulted from use. Clean the unit with a clean rag, or high pressure air hose. Put a few drops of two-cycle engine oil into the cylinder through the spark plug hole, and spin the engine over several times to distribute oil. Cover the unit and store it in a dry area.

Maintenance schedule

Below you will find some general maintenance instructions. For further information please contact your Hitachi dealer.

Daily maintenance

○ Clean the exterior of the hedge trimmer.

○ Check the blade guard for damage or cracks. Change the guard in case of impacts or cracks.

○ Check that the blade is sharp, and without cracks. ○ Check that the blade nut is sufficiently tightened.

○ Make sure that the blade transport guard is undamaged and that it can be securely fitted.

○ Check that nuts and screws are sufficiently tightened.

Weekly maintenance

○ Check the starter, especially cord and return spring. ○ Clean the exterior of the spark plug.

○ Remove it and check the electrode gap. Adjust it to 0.6 mm, or change the spark plug.

○ Clean the cooling fins on the cylinder and check that the air intake at the starter is not clogged.

○ Check gear case is filled with grease. ○ Clean the air filter.

Monthly maintenance

○ Rinse the fuel tank with gasoline.

○ Clean the exterior of the carburetor and the space around it. ○ Clean the fan and the space around it.

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000Book_CH50EA3_ENG.indb 9 2009/12/21 17:35:38