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These factors cause deposits on the spark plug
electrodes, which may result in malfunction and
starting diffi culties. If the engine is low on power,
diffi cult to start or runs poorly at idling speed, always
check the spark plug fi rst. If the spark plug is dirty,
clean it and check the electrode gap. Re-adjust
if necessary. The correct gap is 0.024˝ (0.6 mm).
The spark plug should be replaced after about 100
operation hours or earlier if the electrodes are badly
eroded.
0.024˝
(0.6 mm)
NOTE
In some areas, local law requires using a resistor
spark plug to suppress ignition signals. If this
machine was originally equipped with resistor
spark plug, use same type of spark plug for
replacement.
Maintenance schedule
Below you will fi nd some general maintenance
instructions. For further information please contact
your Hitachi dealer.
Daily maintenance
○ Clean the exterior of the unit.
○ Check the dust cover for damage or cracks.
Change the cover in case of impacts or cracks.
○ Check that nuts and screws are suffi ciently
tightened.
Weekly maintenance
○ Check the starter, especially the cord.
○ Clean the exterior of the spark plug.
○ Remove the spark plug and check the electrode
gap. Adjust it to 0.024˝ (0.6 mm), or change the
spark plug.
○ Clean the air fi lter.
Monthly maintenance
○ Rinse the fuel tank with gasoline, and clean fuel
fi lter.
○ Clean the exterior of the carburetor and the space
around it.
10
Fig. 13
Quarterly maintenance
○ Clean the cooling fi ns on the cylinder.
○ Clean the fan and the space around it.
○ Clean the muffl er of carbon.
CAUTION
Cleaning of cylinder fi ns, fan and muffl er
shall be done by a Hitachi Authorized Service
Center.
NOTE
When ordering the parts to your nearest dealer,
please use the item No. showing on the parts
breakdown section in this instruction.
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