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Air lter (Fig. 15)
The air lter must be cleaned from dust and dirt in order to avoid:
Carburetor malfunctions.
Starting problems.
Engine power reduction.
Unnecessary wear on the engine parts.
Abnormal fuel consumption.
Clean the air lter daily or more often if working in exceptionally
dusty areas.
Cleaning the air lter
Remove the air lter cover and the lter. Rinse it in warm soap suds.
Check that the lter is dry before reassembly. An air lter that has
been used for some time cannot be cleaned completely. Therefore,
it must regularly be replaced by a new one. A damaged lter must
always be replaced.
NOTE
Saturate the element in 2-cycle oil or the equivalent. Squeeze
the element to distribute the oil completely and to remove any
excess oil.
Spark plug (Fig. 16)
The spark plug condition is in uenced by:
An incorrect carburetor setting.
Wrong fuel mixture (too much oil in the gasoline).
A dirty air lter.
Hard running conditions (such as cold weather).
These factors cause deposits on the spark plug electrodes, which
may result in malfunction and starting di culties. If the engine
is low on power, di cult to start or runs poorly at idling speed,
always check the spark plug rst. If the spark plug is dirty, clean it
and check the electrode gap. Readjust if necessary. The correct
gap is 0.6 mm. The spark plug should be replaced after about 100
operation hours or earlier if the electrodes are badly eroded.
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 the same type of spark
plug for replacement.
Cutter blade (Fig. 17, 18)
The blades are installed to the cutter guide with the four or ve
bolts. Those bolts are tightened with a clearance so that the cutters
can move smoothly.
When
clearance is too small
The cutters do not move properly and the sliding surfaces may
seize.
When clearance is too large
The cutters are poor in sharpness.
To adjust the cutter clearance
1. Loosen the cutter xing nuts.
2. Fully tighten the cutter xing bolts and then loosen them approx.
1/2 turn.
3. With the bolts set at that position, tighten the cutter xing nuts.
Be sure to replace cutter guide xing bolts when they are loosened,
worn or damaged. Also be sure to replace damaged cutter blade.
NOTE
Properly lubricate the cutter sliding surfaces with machine oil.
Gear case (Fig. 19)
Apply a good quality lithium based grease through the grease tting
until a small amount comes out between the cutter blades and the
gear case.
NOTE
Lubrication should be applied at 50 hour intervals and more
frequently with heavy use.
Fuel lter (Fig. 20)
Remove the fuel lter from the fuel tank and thoroughly wash it in
solvent. After that, push the lter into the tank completely.
NOTE
If the lter is hard due to dust and dirt, replace it.
Cleaning the cylinder ns (Fig. 21)
When leaves get caught between cylinder ns (16), the engine
may overheat, resulting in lower output. To avoid this, always keep
cylinder ns and fan case clean.
Every 100 operating hours, or once a year (more often if conditions
require), clean ns and external surfaces of engine of dust, dirt and
oil deposits which can contribute to improper cooling.
Cleaning
the mu er (Fig. 22)
Remove the mu er and spark arrestor (if so equipped), and clean
out any excess carbon from the exhaust port or mu er inlet every
100 hours of operation.
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 nd 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 su ciently tightened.
Make sure that the blade transport guard is undamaged and
that it can be securely tted.
Check that nuts and screws are su ciently 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 ns on the cylinder and check that the air
intake at the starter is not clogged.
Check gear case is lled with grease.
Clean the air lter.
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.
000Book_CH50EA.indb 11000Book_CH50EA.indb 11 2009/06/24 9:46:312009/06/24 9:46:31
11

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