Maintenance And Inspection - Hitachi LDU 4 Handling Instructions Manual

English
MOUNTED WHEEL SELECTING METHOD
Mounted wheels attached to this hand grinder are
suitable for grinding press and die cast molds, and
other hard or mild steel parts. (Except stainless plate.)
Types of mounted wheel are varied according to
the materials to be ground. Select a mounted wheel
appropriate for the material to be ground.
● The following table is an outline of mounted wheel and
materials to be ground.
Materials to be ground
Mild steel, hard steel,
forged steel
Cast iron
Brass, bronze, aluminium
Ceramic
Synthetic resin
● Small-scaled mounted wheels with shaft are prepared
for grinding small surfaces. Since mounted wheel shaft
diameter in 3 mm, use the collet chuck for 3 mm shaft
sold separately by your Hitachi dealer as an optional
accessory.
HOW TO USE
1. Switching operation
(1) When throwing the switch lever to the right (ON side),
power is applied; when throwing it to the left (OFF side),
power is switched off .
(2) When fi rst throwing the switch after installing a new
mounted wheel, avoid personal proximity to the
mounted wheel revolving circumference to avoid
danger of a possible imperfection.
2. Precautions on operation
(1) Lightly press the mounted wheel to the material to
be ground
When grinding materials,
is necessary. Use a hand grinder with high-speed
revolution, minimizing the pressing force.
(2) Dressing the mounted wheel
● After attaching a mounted wheel, correct defl ection of
the mounted wheel center by using a dresser.
If the mounted wheel center is eccentric, not only
precise fi nishing cannot be achieved but also grinder
vibration increases, lowering grinder accuracy and
durability.
● A clogged or worn mounted wheel will soil the fi nishing
surface or lower grinding effi ciency. Occasionally dress
the mounted wheel by applying the dresser.

MAINTENANCE AND INSPECTION

1. Inspecting the mounted wheel
Ensure that the mounted 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. Failure to do so
could result in serious hazard.
6
Grain Grading
WA 60 – 80
C 36
C 36
WA 60 – 80
C 36
high-speed revolution
Bonding degree
P
M – O
J – K
M
K – M
3. Maintenance of the motor
The motor unit winding is the very "heart" of the power
tool.
Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
4. Inspecting the carbon brushes (Fig. 3)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brushes with new ones having the same carbon brush
No. shown in the fi gure 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.
5. Replacing carbon brushes
Disassemble the brush caps with a slotted-head
screwdriver. The carbon brushes can then be easily
removed.
6. Service parts list
CAUTION
Repair, modifi cation and inspection of Hitachi Power
Tools must be carried out by an 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.
NOTE
Due to HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
Structure Bonding agent
m V
m V
m V
m V
m V