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4. Gear case lubrication
○ Maintenance interval
The gear case should be checked for lubrication after
each 50 hours of use.
○ Lubrication
Remove the cutting head. Clean any dirt and debris
from the area between the gear case. Remove the M6
bolt from the side of the gear case. While rotating the
attaching shaft, inject lithium-base bearing lube (P/N
682975) through the hole until the gear case is full.
Reinstall M6 bolt.
5. Inspecting the carbon brushes (Fig. 27)
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.
999054.
6. 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. 28.
When installing the carbon brush, choose the direction
so that the nail of the carbon brush (see Fig. 29) agrees
with the contact portion outside the brush tube. Then
push it in with a fi nger as illustrated in Fig. 30. Lastly,
install the brush cap.
CAUTION
○ Be absolutely sure to insert the nail of the carbon brush
into the contact portion outside the 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.
7. 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.
8. Storage
Store grass trimmer in a place in which the temperature
is less than 40°C and out of reach of children.
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