Hitachi CR13V2 Handling Instructions Manual page 8

English
6. Dismounting the blade
(1) Turn on and off the switching trigger several times so
that the lever can jump out of the front cover completely.
Thereafter, turn off the switch and unplug the power
cord. (Fig. 1)
CAUTION
Be absolutely sure to keep the switch turned off and the
power cord unplugged to prevent any accident.
(2) After you have pushed the lever in the direction of the
arrow mark shown in Fig. 2, turn the blade so it faces
downward. The blade should fall out by itself. If the
blade doesn't fall out, pull it out by hand.
CAUTION
Never touch the saw blade immediately after use. The
metal is hot and can easily burn your skin.
WHEN THE BLADE IS BROKEN
Even when the saw blade is broken and remains inside
the small slit of the plunger, it should fall out if you push
the lever in the direction of the arrow mark, and face the
blade downward. If it doesn't fall out itself, take it out
using the procedures explained below.
(1) If a part of the broken saw blade is sticking out of the
small slit of the plunger, pull out the protruding part and
take the blade out.
(2) If the broken saw blade is hidden inside the small slit,
hook the broken blade using a tip of another saw blade
and take it out. (Fig. 7)
MAINTENANCE AND INSPECTION OF SAW BLADE
MOUNT
(1) After use, blow away sawdust, earth, sand, moisture,
etc., with air or brush them away with a brush, etc., to
ensure that the blade mount can function smoothly.
(2) As shown in Fig. 8, carry out lubrication around the
blade holder on a periodic basis by use of cutting fl uid,
etc.
NOTE
Continued use of the tool without cleaning and
lubricating the area where the saw blade is installed
can result in some slack movement of the lever
due to accumulated sawdust and chips. Under the
circumstances, pull a rubber cap provided on the lever
in the direction of an arrow mark as shown in Fig. 9 and
remove the rubber cap from the lever. Then, clean up
the inside of the blade holder with air and the like and
carry out suffi cient lubrication.
The rubber cap can be fi tted on if it is pressed fi rmly
onto the lever. At this time, make certain that there
exists no clearance between the blade holder and the
rubber cap, and furthermore ensure that the saw-blade-
installed area can function smoothly.
CAUTION
Do not use any saw blade with a worn-out blade hole.
Otherwise, the saw blade can come off , resulting in
personal injury. (Fig. 10)
7. Adjusting the base
(1) Lift the front cover up as illustrated in Fig. 11.
(2) If a base setting screw is loosened with an attached
hexagonal bar wrench, you can adjust a base installing
position. (Fig. 12, Fig. 13)
(3) After adjusting the base installing position, tighten the
base setting screw with the attached hexagonal bar
wrench completely.
8. Adjusting the blade reciprocating speed
This unit has a built-in electronic control circuit that
makes it possible to adjust the variable speed of the
saw blade by pulling a switching trigger. (Fig. 14)
8
If you pull the trigger further in, the speed of the blade
accelerates. Begin cutting at a low speed to ensure
the accuracy of your target cut position. Once you've
obtained a suffi cient cutting depth, increase the cutting
speed.
CAUTION
Although this unit employs a powerful motor, prolonged
use at a low speed will increase the load unduly and
may lead to overheating. Properly adjust the saw blade
to allow steady, smooth cutting operation, avoiding any
unreasonable use such as sudden stops during cutting
operation.
HOW TO USE
CAUTION
○ Avoid carrying it plugged to the outlet with your fi nger
on the switch. A sudden startup can result in an
unexpected injury.
○ Be careful not to let sawdust, earth, moisture, etc., enter
the inside of the machine through the plunger section
during operation. If sawdust and the like accumulate in
the plunger section, always clean it before use.
○ Do not remove the front cover (refer to Fig. 1).
Be sure to hold the body from the top of the front cover.
○ During use, press the base against the material while
cutting.
Vibration can damage the saw blade if the base is not
pressed fi rmly against the workpiece.
Furthermore, a tip of the saw blade can sometimes
contact the inner wall of the pipe, damaging the saw
blade.
○ Select a saw blade of the most appropriate length.
Ideally, the length protruding from the base of the saw
blade after subtracting the stroke quantity should be
larger than the material (see Fig. 15 and Fig. 17).
If you cut a large pipe, large block of wood, etc., that
exceeds the cutting capacity of a blade; there is a risk
that the blade may contact with the inner wall of the
pipe, wood, etc., resulting in damage. (Fig. 16, Fig. 18)
1. Cutting metallic materials
CAUTION
○ Press the base fi rmly against the workpiece.
○ Never apply any unreasonable force to the saw blade
when cutting. Doing so can easily break the blade.
(1) Fasten a workpiece fi rmly before operation. (Fig. 19)
(2) When cutting metallic materials, use proper machine
oil (turbine oil, etc.). When not using liquid machine oil,
apply grease over the workpiece.
CAUTION
The service life of the saw blade will be drastically
shortened if you don't use machine oil.
2. Cutting lumber
When cutting lumber, make sure that the workpiece is
fastened fi rmly before beginning. (Fig. 20)
CAUTION
○ Never apply any unreasonable force to the saw blade
when cutting. Also remember to press the base against
the lumber fi rmly.
3. Sawing curved lines
We recommend that you use the BI-METAL blade
mentioned in Table 2 for the saw blade since it is tough
and hardly breaks.
CAUTION
Delay the feed speed when cutting the material into
small circular arcs. An unreasonably fast feed may
break the blade.