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ABOUT USB DEVICE
○ Charging a USB device from an electrical outlet.
(Fig. 42-a)
○ Charging a USB device and battery from an electrical
outlet. (Fig. 42-b)
○ How to recharge USB device. (Fig. 43)
○ When charging of USB device is completed. (Fig. 44)
MAINTENANCE AND INSPECTION
CAUTION
Pull out battery before doing any inspection or
maintenance.
1. Checking the condition of the nylon head
The nylon head should be checked regularly. If worn or
broken nylon head can slip or decrease the effi ciency of
the motor and burn it out.
Replace worn nylon head with new ones.
CAUTION
If you use a nylon head of which point is worn or broken,
it will be dangerous. So replace it with a new one.
2. Check the Screws
Loose screws are dangerous. Regularly inspect them
and make sure they are tight.
CAUTION
Using this power tool with loosened screws is extremely
dangerous.
3. Inspecting the carbon brushes (Fig. 38)
The motor employs carbon brushes which are
consumable parts. Since and excessively worn carbon
brush can result in motor trouble, replace the carbon
brush with new ones when it becomes worn to or near
the "wear limit". In addition, always keep carbon brushes
clean and ensure that they slide freely within the brush
holders.
NOTE
When replacing the carbon brush with a new one, be
sure to use the Hitachi Carbon Brush Code No. 999015.
4. Replacing carbon brushes
Take out the carbon brush by fi rst removing the brush
cap and then hooking the protrusion of the carbon
brush with a slotted head screw driver, etc., as shown in
Fig. 39.
When installing the carbon brush, choose the direction
so that the nail of the carbon brush (see Fig. 40) agrees
with the contact portion of brush tube. Then push it in
with a fi nger as illustrated in Fig. 41. Lastly, install the
brush cap.
CAUTION
○ Be absolutely sure to insert the nail of the carbon brush
into the contact portion of brush tube. (You can insert
whichever one of the two nails provided.)
○ Caution must be exercised since any error in this
operation can result in the deformed nail of the carbon
brush and may cause motor trouble at an early stage.
5. Inspection of terminals (tool and battery)
Check to make sure that swarf and dust have not
collected on the terminals.
On occasion check prior, during and after operation.
CAUTION
Remove any swarf or dust which may have collected on
the terminals.
Failure to do so may result in malfunction.
6. Cleaning of the outside
When the grass trimmer is stained, wipe with a soft dry
cloth or a cloth moistened with soapy water. Do not use
chloric solvents, gasoline or paint thinner, as they melt
plastics.
7. Storage
Store grass trimmer in a place in which the temperature
is less than 40°C and out of reach of children.
NOTE
Storing Lithium-ion Batteries
Make sure the lithium-ion batteries have been fully
charged before storing them.
Prolonged storage (3 months or more) of batteries with
a low charge may result in performance deterioration,
signifi cantly reducing battery usage time or rendering
the batteries incapable of holding a charge.
However, signifi cantly reduced battery usage time may
be recovered by repeatedly charging and using the
batteries two to fi ve times.
If the battery usage time is extremely short despite
repeated charging and use, consider the batteries dead
and purchase new batteries.
CAUTION
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
SELECTING ACCESSORIES
The accessories of this machine are listed on page 21.
Important notice on the batteries for the Hitachi
cordless power tools
Please always use one of our designated genuine
batteries. We cannot guarantee the safety and
performance of our cordless power tool when used with
batteries other than these designated by us, or when
the battery is disassembled and modifi ed (such as
disassembly and replacement of cells or other internal
parts).
NOTE
Due to HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
17
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