Maintenance And Inspection - Hitachi GP 3V Instruction Manual

MAINTENANCE AND INSPECTION

WARNING
● Be sure to switch power OFF and disconnect the
plug during maintenance and inspection.
● Using cracked, deformed or damaged wheels
can lead to wheel breakage and resulting serious
injury.
1. Inspecting the wheel
Ensure that the wheel is free of cracks and surface
defects.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that
they are properly tightened. Should any of the screws
be loose, retighten them immediately.
WARNING
Using this hand grinder with loosened screws is
extremely dangerous.
3. Inspecting the carbon brushes (Fig. 7)
The motor employs carbon brushes which are
consumable parts. Replace the carbon brush with a
new one when it becomes worn to its wear limit. Always
keep carbon brushes clean and ensure that they slide
freely within the brush holders.
Wear limit
0.67" (17 mm)
CAUTION
Using this hand grinder with a carbon brush which
is worn in excess of the wear limit will damage the
motor.
NOTE
Use HITACHI carbon brush No. 88 indicated in Fig. 7.
4. Replacing carbon brushes (Fig. 8):
<Disassembly>
(1) Loosen the D4 tapping screw retaining the tail cover
and remove the tail cover.
(2) Use the auxiliary hexagonal wrench or small screwdriver
to pull up the edge of the spring that is holding down the
carbon brush. Remove the edge of the spring toward
the outside of the brush holder.
No. of carbon brush
88
0.24" (6 mm)
Fig. 7
(3) Remove the end of the pig-tail on the carbon brush from
the terminal section of brush holder and then remove
the carbon brush from the brush holder.
<Assembly>
(1) Insert the end of the pig-tail of the carbon brush in the
terminal section of brush holder.
(2) Insert the carbon brush in the brush holder.
(3) Use the auxiliary hexagonal wrench or small screwdriver
to return the edge of the spring to the head of the carbon
brush.
NOTE
Make sure the end of the spring is not holding the pig-
tail.
(4) Mount the tail cover and tighten the D4 tapping screw.
Spring
Carbon Brush
Brush Holder
5. Service and repairs
All quality power tools will eventually require servicing or
replacement of parts because of wear from normal use.
To assure that only authorized replacement parts will
be used, all service and repairs must be performed by
a HITACHI AUTHORIZED SERVICE CENTER, ONLY.
6. Service parts list
CAUTION
Repair, modifi cation and inspection of Hitachi
Power Tools must be carried out by a Hitachi
Authorized Service Center.
This Parts List will be helpful if presented with
the tool to the Hitachi Authorized Service Center
when requesting repair or other maintenance. In
the operation and maintenance of power tools,
the safety regulations and standards prescribed
in each country must be observed.
MODIFICATIONS:
Hitachi Power Tools are constantly being improved
and modifi ed to incorporate the latest technological
advancements.
Accordingly, some parts may be changed without prior
notice.
English
Fig. 8
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