Makita HR4500C Instruction Manual

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Contents

7FUNCTIONAL DESCRIPTIONCAUTION:• Always be sure that the tool is switched off andunplugged before adjusting or checking function on thetool.Switch action (Fig. 1)CAUTION:• Before plugging in the tool, always check to see thatthe switch trigger actuates properly and returns to the“OFF” position when released.To start the tool, simply pull the switch trigger. Releasethe switch trigger to stop.Speed change (Fig. 2)The revolutions and blows per minute can be adjustedjust 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 thenumber settings on the adjusting dial and the revolutions/blows per minute.Selecting the action modeRotation with hammering (Fig. 3)For drilling in concrete, masonry, etc., depress the lockbutton and rotate the change lever so that the pointerpoints to the symbol. Use a tungsten-carbide tippedbit.Hammering only (Fig. 4)For chipping, scaling or demolition operations, depressthe lock button and rotate the change lever so that thepointer points to the symbol. Use a bull point, coldchisel, scaling chisel, etc.CAUTION:• Do not rotate the change lever when the tool is runningunder load. The tool will be damaged.• To avoid rapid wear on the mode change mechanism,be sure that the change lever is always positivelylocated in one of the two or three action mode posi-tions.Torque limiterThe torque limiter will actuate when a certain torque levelis reached. The motor will disengage from the outputshaft. When this happens, the bit will stop turning.CAUTION:• As soon as the torque limiter actuates, switch off thetool immediately. This will help prevent premature wearof the tool.Indicator lamp (Fig. 5)The green power-ON indicator lamp lights up when thetool is switched ON. If the indicator lamp is lit but the tooldoes not start, the carbon brushes may be worn out, orthe electric circuit or the motor may be defective. If theindicator lamp does not light up and the tool does notstart, the ON/OFF switch or the mains cord may bedefective.The red service indicator lamp lights up when the carbonbrushes are nearly worn out to indicate that the toolneeds servicing. After approx. 8 hours of use, the motorwill automatically be shut off.ASSEMBLYCAUTION:• Always be sure that the tool is switched off andunplugged before carrying out any work on the tool.Side handle (Fig. 6 & 7)CAUTION:• Use the side handle only when chipping, scaling ordemolishing. Do not use it when drilling in concrete,masonry, etc. The tool cannot be held properly with thisside handle when drilling.The side handle can be swung 360° on the vertical andsecured at any desired position. It also secures at eightdifferent positions back and forth on the horizontal. Justloosen the clamp nut to swing the side handle to adesired position. Then tighten the clamp nut securely.Side grip (Fig. 8)CAUTION:• Always use the side grip to ensure operating safetywhen drilling in concrete, masonry, etc.The side grip swings around to either side, allowing easyhandling of the tool in any position. Loosen the side gripby turning it counterclockwise, swing it to the desiredposition and then tighten it by turning clockwise.Installing or removing the bitClean the bit shank and apply bit grease before installingthe bit. (Fig. 9)Insert the bit into the tool. Turn the bit and push it in untilit engages.If the bit cannot be pushed in, remove the bit. Pull thechuck cover down a couple of times. Then insert the bitagain. Turn the bit and push it in until it engages.(Fig. 10)After installing, always make sure that the bit is securelyheld in place by trying to pull it out.To remove the bit, pull the chuck cover down all the wayand pull the bit out. (Fig. 11)Bit angle (when chipping, scaling or demolishing)The bit can be secured at 16 different angles. To changethe bit angle, depress the lock button and rotate thechange lever so that the pointer points to the “O” symbol.Turn the bit to the desired angle. (Fig. 12)Depress the lock button and rotate the change lever sothat the pointer points to the symbol. Then make surethat the bit is securely held in place by turning it slightly.(Fig. 13)Number onadjusting dialRevolutions perminuteBlows perminute6 240 2,5505 230 2,4504 200 2,1003 160 1,7002 130 1,3001 120 1,250