MAKITA HR2455 (01) PDF Document

Keep your work area clean and well lit. Cluttered benches and dark areas invite accidents.

Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Power tools create sparks which may ignite the dust or fumes.

Keep bystanders, children, and visitors away while operating a power tool. Distractions can cause you to lose control.

Make sure your extension cord is in good condition. When using an extension cord, be sure to use one heavy enough to carry the current your product will draw. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. The following table shows the correct size to use depending on cord length and nameplate ampere rating. If in doubt, use the next heavier gage. The smaller the gage number, the heavier the cord.

V: volts

A: amperes

Hz: hertz

Symbol indicating alternating current

n0: no load speed

Symbol indicating Class II Construction

…/min: revolutions or reciprocation per minute

Symbol indicating number of blow

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 switch trigger. Tool speed is increased by increasing pressure on the switch trigger.

Release the switch trigger to stop.

For continuous operation, pull the switch trigger and then push in the lock button. To stop the tool from the locked position, pull the switch trigger fully, then release it.

This tool has a reversing switch to change the direction of rotation. Move the reversing switch lever to the position (A side) for clockwise rotation or to the position (B side) for counterclockwise rotation.

Always check the direction of rotation before operation.

Use the reversing switch only after the tool comes to a complete stop. Changing the direction of rotation before the tool stops may damage the tool.

When you operate the tool in counterclockwise rotation, the switch trigger is pulled only halfway and the tool runs at half speed. For counterclockwise rotation, you cannot push in the lock button.

Rotation with hammering: For drilling in concrete, masonry, etc., depress the lock button and rotate the action mode changing knob to the hammer/drill bit symbol. Use a tungsten-carbide tipped bit.

Hammering only: For chipping, scaling or demolition operations, depress the lock button and rotate the action mode changing knob to the hammer symbol. Use a bull point, cold chisel, scaling chisel, etc.

Rotation only: For drilling in wood, metal or plastic materials, depress the lock button and rotate the action mode changing knob to the drill bit symbol. Use a twist drill bit or wood bit.

Caution: Do not rotate the action mode changing knob 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 action mode changing knob is always positively located in one of the three action mode positions.

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.

As soon as the torque limiter actuates, switch off the tool immediately. This will help prevent premature wear of the tool.

Hole saws cannot be used with this tool. They tend to pinch or catch easily in the hole. This will cause the torque limiter to actuate too frequently.

Always use the side grip to ensure operating safety. Install the side grip so that the teeth on the grip fit in between the protrusions on the tool barrel. Then tighten the grip by turning clockwise at the desired position. It may be swung 360 degrees so as to be secured at any position.

Bit Grease: Coat the bit shank head beforehand with a small amount of bit grease (about 0.5 – 1 g). This chuck lubrication assures smooth action and longer service life.

Installation: 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. After installing, always make sure that the bit is securely held in place by trying to pull it out.

Removal: To remove the bit, pull the chuck cover down all the way and pull the bit out.

The bit can be secured at the desired angle. To change the bit angle, depress the lock button and rotate the action mode changing knob to the “O” symbol. Turn the bit to the desired angle.

Depress the lock button and rotate the action mode changing knob to the hammer symbol. Then make sure that the bit is securely held in place by turning it slightly.

The depth gauge is convenient for drilling holes of uniform depth. Loosen the side grip and insert the depth gauge into the hole in the side grip. Adjust the depth gauge to the desired depth and tighten the side grip.

Note: The depth gauge cannot be used at the position where the depth gauge strikes against the gear housing.

Use the dust cup to prevent dust from falling over the tool and on yourself when performing overhead drilling operations. Attach the dust cup to the bit.

The size of bits which the dust cup can be attached to is as follows:

Dust cup 5: Bit diameter 6 mm (1/4”) – 14.5 mm (9/16”)

Dust cup 9: Bit diameter 12 mm (15/32”) – 16 mm (5/8”)

Set the action mode changing knob to the hammer/drill bit 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.

Use the blow-out bulb to clean out the hole.

CAUTION: There is tremendous and sudden twisting force exerted on the tool/bit at the time of hole break-through, when the hole becomes clogged with chips and particles, or when striking reinforcing rods embedded in the concrete. Always use the side grip (auxiliary handle) and firmly hold the tool by both side grip and switch handle during operations. Failure to do so may result in the loss of control of the tool and potentially severe injury.

Set the action mode changing knob to the hammer 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.

Use the optional drill chuck assembly. When installing it, refer to “Installing or removing drill bit”.

Set the action mode changing knob to the drill bit symbol. You can drill up to 13 mm (1/2”) diameter in metal and up to 32 mm (1-1/4”) diameter in wood.

CAUTION:

Never use “rotation with hammering” when the drill chuck assembly is installed on the tool. The drill chuck assembly may be damaged. Also, the drill chuck will come off when reversing the tool.

Pressing excessively on the tool will not speed up the drilling. In fact, this excessive pressure will only serve to damage the tip of your bit, decrease the tool performance and shorten the service life of the tool.

There is tremendous twisting force exerted on the tool/bit at the time of hole breakthrough. Hold the tool firmly and exert care when the bit begins to break through the workpiece.

A stuck bit can be removed simply by setting the reversing switch to reverse rotation in order to back out. However, the tool may back out abruptly if you do not hold it firmly.

Always secure small workpieces in a vise or similar hold-down device.

When performing diamond core drilling operations, always set the change lever to the position to use “rotation only” action. If performing diamond core drilling operations using “rotation with hammering” action, the diamond core bit may be damaged.

Always be sure that the tool is switched off and unplugged before attempting to perform inspection or maintenance.

To maintain product SAFETY and RELIABILITY, repairs, carbon brush inspection and replacement, any other maintenance or adjustment should be performed by Makita Authorized or Factory Service Centers, always using Makita replacement parts.