Makita HR4500C Manuel D'instructions page 7

Hammering only (Fig. 5 & 7)
For chipping, scaling or demolition operations, depress
the lock button and rotate the change lever so that the
g
pointer points to the
chisel, scaling chisel, etc.
CAUTION:
• Do not rotate the change lever when the tool is running
under load. The tool will be damaged.
• To avoid rapid wear on the mode change mechanism,
be sure that the change lever is always positively
located in one of the two action mode positions.
Bit angle
(when chipping, scaling or demolishing)
CAUTION:
Always be sure that the tool is switched off and
unplugged before changing the bit angle.
The bit can be secured at 16 different angles. To change
the bit angle, depress the lock button and rotate the
change lever so that the pointer points to the
Turn the bit to the desired angle. (Fig. 8)
Depress the lock button and rotate the change lever so
that the pointer points to the
Then make sure that the bit is securely held in place by
turning it slightly.
Side handle (Fig. 10)
CAUTION:
Use the side handle only when chipping, scaling or
demolishing. Do not use it when drilling in concrete,
masonry, etc. The tool cannot be held properly with this
side handle when drilling.
The side handle can be swung 360° on the vertical and
secured at any desired position. It also secures at eight
different positions back and forth on the horizontal. Just
loosen the clamp nut to swing the side handle to a
desired position. Then tighten the clamp nut securely.
Side grip (Fig. 11)
CAUTION:
Always use the side grip to ensure operating safety when
drilling in concrete, masonry, etc.
The side grip swings around to either side, allowing easy
handling of the tool in any position. Loosen the side grip
by turning it counterclockwise, swing it to the desired
position and then tighten it by turning clockwise.
Switch action (Fig. 12)
CAUTION:
Before plugging in the tool, always check to see that the
switch trigger actuates properly and returns to the "OFF"
position when released.
To start the tool, simply pull the trigger. Release the trig-
ger to stop.
symbol. Use a bull point, cold
O
symbol.
g
symbol. (Fig. 9)
Speed change (Fig. 13)
The revolutions and blows per minute can be adjusted
just by turning the adjusting dial. The dial is marked 1
(lowest speed) to 6 (full speed). Refer to the table below
for the relationship between the number settings on the
adjusting dial and the revolutions/blows per minute.
Number on Revolutions per
adjusting dial
6
5
4
3
2
1
Hammer drilling operation (Fig. 14)
Set the change lever to the
at the location for the hole, then pull the trigger. Do not
force the tool. Light pressure gives best results. Keep the
tool in position and prevent it from slipping away from the
hole.
Do not apply more pressure when the hole becomes
clogged with chips or particles. Instead, run the tool at an
idle, then remove from the hole. By repeating this several
times, the hole will be cleaned out.
CAUTION:
When the bit begins to break through concrete or if the
bit strikes reinforcing rods embedded in concrete, the tool
may react dangerously. Maintain good balance and safe
footing while holding the tool firmly with both hands to
prevent dangerous reaction.
Torque limiter
The torque limiter will actuate when a certain torque level
is reached. The motor will disengage from the output
shaft. When this happens, the bit will stop turning.
CAUTION:
As soon as the torque limiter actuates, switch off the tool
immediately. This will help prevent premature wear of the
tool.
Chipping/Scaling/Demolition (Fig. 15)
Set the change lever to the
firmly with both hands. Turn the tool on and apply slight
pressure on the tool so that the tool will not bounce
around, uncontrolled. Pressing very hard on the tool will
not increase the efficiency.
Depth gauge (Fig. 16)
The depth gauge is convenient for drilling holes of uni-
form depth. Loosen the clamp screw and adjust the
depth gauge to the desired depth. After adjusting, tighten
the clamp screw firmly.
NOTE:
The depth gauge cannot be used at the position where
the depth gauge strikes against the gear housing/motor
housing.
Blows per
minute minute
240 2,550
230 2,450
200 2,100
160 1,700
130 1,300
120 1,250
h
symbol. Position the bit
g
symbol. Hold the tool
7