Manual Makita MT903 (page 8 of 68) (English, German, Dutch, Danish, French, Italian, Portuguese, Spanish)

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FUNCTIONAL DESCRIPTION

CAUTION:

• Always be sure that the tool is switched off and

unplugged before adjusting or checking function on the

tool.

Shaft lock (Fig. 1)

CAUTION:

• Never actuate the shaft lock when the spindle is mov-

ing. The tool may be damaged.

Press the shaft lock to prevent spindle rotation when

installing or removing accessories.

Switch action (Fig. 2)

CAUTION:

• Before plugging in the tool, always check to see that

the switch trigger actuates properly and returns to the

“OFF” position when released.

For tool with the lock-on switch

To start the tool, simply pull the switch trigger (in the B

direction). Release the switch trigger to stop. For continu-

ous operation, pull the switch trigger (in the B direction)

and then push in the lock lever (in the A direction). To

stop the tool from the locked position, pull the switch trig-

ger fully (in the B direction), then release it.

For tool with the lock-off switch

To prevent the switch trigger from being accidentally

pulled, a lock lever is provided.

To start the tool, push in the lock lever (in the A direction)

and then pull the switch trigger (in the B direction).

Release the switch trigger to stop.

For tool with the lock on and lock-off switch

To prevent the switch trigger from accidentally pulled, a

lock lever is provided.

To start the tool, push in the lock lever (in the A direction)

and then pull the switch trigger (in the B direction).

Release the switch trigger to stop.

For continuous operation, push in the lock lever (in the A

direction), pull the switch trigger (in the B direction) and

then push the lock lever (in the A direction) further in.

To stop the tool from the locked position, pull the switch

trigger fully (in the B direction), then release it.

ASSEMBLY

CAUTION:

• Always be sure that the tool is switched off and

unplugged before carrying out any work on the tool.

Installing side grip (handle) (Fig. 3)

CAUTION:

• Always be sure that the side grip is installed securely

before operation.

Screw the side grip securely on the position of the tool as

shown in the figure.

Installing or removing wheel guard (For

depressed center wheel, multi disc, wire wheel

brush / abrasive cut-off wheel, diamond wheel)

WARNING:

• When using a depressed center grinding wheel/Multi-

disc, flex wheel or wire wheel brush, the wheel guard

must be fitted on the tool so that the closed side of the

guard always points toward the operator.

• When using an abrasive cut-off / diamond wheel, be

sure to use only the special wheel guard designed for

use with cut-off wheels.

Mount the wheel guard with the protrusion on the wheel

guard band aligned with the notch on the bearing box.

Then rotate the wheel guard around 180 degrees coun-

terclockwise. Be sure to tighten the screw securely. To

remove wheel guard, follow the installation procedure in

reverse. (Fig. 4)

Installing or removing depressed center grinding

wheel/Multi-disc (accessory)

Mount the inner flange onto the spindle. Fit the wheel/

disc on the inner flange and screw the lock nut onto the

spindle. (Fig. 5)

NOTE:

• When using a more than 7 mm thick depressed center

grinding wheel, overturn the lock nut and screw it onto

the spindle.

For Australia and New Zealand (Fig. 6)

Mount the inner flange onto the spindle. Fit the wheel/

disc on the inner flange and screw the lock nut with its

protrusion facing downward (facing toward the wheel).

To tighten the lock nut, press the shaft lock firmly so that

the spindle cannot revolve, then use the lock nut wrench

and securely tighten clockwise.

To remove the wheel, follow the installation procedure in

reverse. (Fig. 7)

OPERATION

WARNING:

• It should never be necessary to force the tool. The

weight of the tool applies adequate pressure. Forcing

and excessive pressure could cause dangerous wheel

breakage.

• ALWAYS replace wheel if tool is dropped while grind-

ing.

• NEVER bang or hit grinding disc or wheel onto work.

• Avoid bouncing and snagging the wheel, especially

when working corners, sharp edges etc. This can

cause loss of control and kickback.

• NEVER use tool with wood cutting blades and other

sawblades. Such blades when used on a grinder fre-

quently kick and cause loss of control leading to per-

sonal injury.

CAUTION:

• Never switch on the tool when it is in contact with the

workpiece, it may cause an injury to operator.

• Always wear safety goggles or a face shield during

operation.

• After operation, always switch off the tool and wait until

the wheel has come to a complete stop before putting

the tool down.

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Makita MT903 Manual

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