Makita HR4511C, Instruction Manual

7

Indicator lamp (Fig. 9)

The green power-ON indicator lamp lights up when the 
tool is plugged. If the indicator lamp does not light up, the 
mains cord or the controller may be defective. The 
indicator lamp is lit but the tool does not start even if the 
tool is switched on, the carbon brushes may be worn out, 
or the controller, the motor or the ON/OFF switch may be 
defective. 
The red service indicator lamp lights up when the carbon 
brushes are nearly worn out to indicate that the tool needs 
servicing. After approx. 8 hours of use, the motor will 
automatically be shut off. 

ASSEMBLY 

CAUTION: 

• Always be sure that the tool is switched off and 

unplugged before carrying out any work on the tool. 

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. 

(Fig. 11)

Side grip (Fig. 12)

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. 

Installing or removing the bit (Fig. 13)

Clean the bit shank and apply bit grease before installing 
the bit. 
Insert the bit into the tool. Turn the bit and push it in until
it engages. 

(Fig. 14)

If the bit cannot be pushed in, remove the bit. Pull the 
chuck cover down a couple of times. Then insert the bit 
again. Turn the bit and push it in until it engages. 
After installing, always make sure that the bit is securely 
held in place by trying to pull it out. 
To remove the bit, pull the chuck cover down all the way 
and pull the bit out. 

(Fig. 15)

Bit angle (when chipping, scaling or 
demolishing) (Fig. 16 & 17)

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 

 symbol.

Turn the bit to the desired angle.
Depress the lock button and rotate the change lever so 
that the pointer points to the   symbol. Then make sure 
that the bit is securely held in place by turning it slightly. 

(Fig. 18 & 19)

Depth gauge (Fig. 20)

The depth gauge is convenient for drilling holes of uniform 
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. 

OPERATION 

Hammer drilling operation (Fig. 21)

Set the change lever to the   symbol. 
Position the bit at the desired location for the hole, then 
pull the switch 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 the bit partially from the hole. By 
repeating this several times, the hole will be cleaned out 
and normal drilling may be resumed. 

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. 

Blow-out bulb (optional accessory) 
(Fig. 22)

After drilling the hole, use the blow-out bulb to clean the 
dust out of the hole. 

Chipping/Scaling/Demolition (Fig. 23)

Set the change lever to the   symbol. 
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. 

MAINTENANCE 

CAUTION: 

• Always be sure that the tool is switched off and 

unplugged before attempting to perform inspection or 
maintenance. 

• Never use gasoline, benzine, thinner, alcohol or the 

like. Discoloration, deformation or cracks may result.

CAUTION: 

• This servicing should be performed by Makita 

Authorized Service Centers only.

This tool requires no hourly or daily lubrication because it 
has a grease-packed lubrication system. It should be 
lubricated every time the carbon brushes are replaced. 
Send the complete tool to Makita Authorized Service 
Center for this lubrication service. 
To maintain product SAFETY and RELIABILITY, repairs, 
any other maintenance or adjustment should be 
performed by Makita Authorized Service Centers, always 
using Makita replacement parts.