Makita HR4000C Instruction Manual page 8

Hammering only (Fig. 5 & 7)
For chipping, scaling or demolition operations,
depress the lock button and rotate the change lever
so that the pointer points to the g symbol. Use a bull
point, cold chisel, scaling chisel, etc.
CAUTION:
• Do not rotate the change lever when the tool is run-
ning under load. The tool will be damaged.
• To avoid rapid wear on the mode change mecha-
nism, be sure that the change lever is always posi-
tively located in one of the two action mode
positions.
Bit angle
(when chipping, scaling or demolishing)
Important:
Always be sure that the tool is switched off and
unplugged before changing the bit angle.
The bit can be secured at 12 different angles. To
change the bit angle, depress the lock button and
rotate the change lever so that the pointer points to
the O symbol. 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 g symbol. (Fig. 9)
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 hori-
zontal. 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
trigger to stop.
8
Speed change (Fig. 12)
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 num-
ber settings on the adjusting dial and the revolutions/
blows per minute.
Number on Revolutions
adjusting dial per minute
6
5
4
3
2
1
Hammer drilling operation (Fig. 13)
Set the change lever to the h symbol. Position the
bit 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 bal-
ance 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. 14)
Set the change lever to the g bol. Hold the tool
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.
Blows
per minute
450 2,500
430 2,350
370 2,050
310 1,700
250 1,400
230 1,250