Maintenance And Inspection - Hitachi Koki VB 16Y Handling Instructions Manual

English
If you bend the rebar with a large angle while placing
your hand onto it, there is a fear of getting your hand
caught in by the fold-back reaction of the rebar. Never
place your hand onto the position where the rebar
may fold back.
Dial indication
Condition of rebar
In bending the rebar of 10mm, 12mm, and 16mm
diameters, a difference takes place in the bending
angle even in the same dial position depending upon
the difference of rebar's thickness. Slightly change a
position of the setting dial depending upon the rebar's
diameter even with the same bending angle as
illustrated in the top diagram on the left column.
(Fig. 11)
Size of rebar
ø10 mm
ø12 mm
ø16 mm
NOTE
Even at the same dial setting position, the bending
angle can sometimes differ if the diameter or hardness
of the rebar is different. Use the angle marks merely
as a rough guideline.
2. Ordinary bending.
(1) Set the unit in the position with the turntable up as
shown in Fig. 12.
(2) Make sure that the cover is closed.
(3) Set the setting dial at the desired angle.
(4) Place the rebar on the stopper of the center plate and
set it correctly as shown in Fig. 9.
(5) Pull the switch trigger and bent the rebar.
(6) Continue pulling the switch trigger untill the motor
makes reverse rotation and the bending roller starts
to return. (Once the bending roller starts to return, it
will automatically return all the way to the home
position even if the switch trigger is released.)
3. Bending by eye measurement.
By pulling the switching trigger little by little, you can
bend the rebar to your desired angle by eye
measurement in addition to the dial setting.
(1) Set the setting dial to a larger angle than you desire.
(2) Pull the switch trigger lightly and bend the rebar
slowly.
(3) When the rebar is bent to the desired angle, stop
pulling the switch. If the bar is still small of the desired
angle, pull the switch again.
(4) Remove the rebar after bending has been finished.
Then, pull the switch once more and return the
bending roller to the home position. (Continue pulling
the switch until the bending roller begins reverse
rotation.)
39
45°
45° 90°
Colors of indicated marks
White
Red
Yellow
1. Setting bending angles by setting dial.
The bar can be bent according to the angles indicated
on the setting dial, as shown in Fig.16.
90° 135°
135°
Fig. 16
4. Removing rebar during bending operation
When bending out at a low speed in "bending by eye
measurement", the rebar can sometimes get caught
in the bending roller due to its own flexure.
If this occurs, you can return the bending roller to the
home position by pulling the switch again after setting
the setting dial to the "return" position. This is the
same method used to remove the rebar when it gets
caught during cutting operation. (Fig. 13)
5. Using hole to fix unit in place.
A hole is provided at the center of the unit to fix and
stabilize it. This hole comes in quite handy when used
in the following manner. (Fig. 14)
For bending operation when the unit is fixed to a work
bench.
This hole will prove very convenient when the unit is
bolted to a suitable work bench. (Bolt size M10, less
than W3/8.)

MAINTENANCE AND INSPECTION

WARNING!
To prevent accidents, always be sure to turn the switch
OFF and unplug the power cord from the receptacle.
1. 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.
2. 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.
3. Inspecting the carbon brushes (Fig. 15)
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 which have the same carbon
brush No. shown in the figure when they become
worn to or near the "wear limit". In addition, always
keep carbon brushes clean and ensure that they slide
freely within the brush holders.
4. Replacing carbon brushes. (Fig. 14, Fig. 15)
Loosen the set screws and remove the tail cover.
Remove the brush caps and carbon brushes. After
replacing the carbon brushes, do not forget to tighten
the brush caps securely and to mount the tail cover
with set screws.
180°
180°