Functional Description - Makita MT904 Instruction Manual

Additional Safety Warnings:
17. When using depressed centre grinding wheels, be
sure to use only fiberglass-reinforced wheels.
18. NEVER USE Stone Cup type wheels with this
grinder. This grinder is not designed for these types
of wheels and the use of such a product may result in
serious personal injury.
19. Be careful not to damage the spindle, the flange
(especially the installing surface) or the lock nut.
Damage to these parts could result in wheel
breakage.
20. Make sure the wheel is not contacting the
workpiece before the switch is turned on.
21. Before using the tool on an actual workpiece, let it
run for a while. Watch for vibration or wobbling
that could indicate poor installation or a poorly
balanced wheel.
22. Use the specified surface of the wheel to perform
the grinding.
23. Do not leave the tool running. Operate the tool
only when hand-held.
24. Do not touch the workpiece immediately after
operation; it may be extremely hot and could burn
your skin.
25. Observe the instructions of the manufacturer for
correct mounting and use of wheels. Handle and
store wheels with care.
26. Do not use separate reducing bushings or
adaptors to adapt large hole abrasive wheels.
27. Use only flanges specified for this tool.
28. For tools intended to be fitted with threaded hole
wheel, ensure that the thread in the wheel is long
enough to accept the spindle length.
29. Check that the workpiece is properly supported.
30. Pay attention that the wheel continues to rotate
after the tool is switched off.
31. If working place is extremely hot and humid, or
badly polluted by conductive dust, use a short-
circuit breaker (30 mA) to assure operator safety.
32. Do not use the tool on any materials containing
asbestos.
SAVE THESE INSTRUCTIONS.
WARNING:
DO NOT let comfort or familiarity with product (gained
from repeated use) replace strict adherence to safety
rules for the subject product. MISUSE or failure to
follow the safety rules stated in this instruction
manual may cause serious personal injury.

FUNCTIONAL DESCRIPTION

CAUTION:
• Always be sure that the tool is switched off and
unplugged before adjusting or checking function on the
tool.
Shaft lock
CAUTION:
• Never actuate the shaft lock when the spindle is
moving. The tool may be damaged.
Press the shaft lock to prevent spindle rotation when
installing or removing accessories. (Fig. 1)
6
Switch action
CAUTION:
• Before plugging in the tool, always check to see that
the switch trigger actuates properly and returns to the
"OFF" position when released. (Fig. 2)
For tool without lock button
To start the tool, simply pull the switch trigger. Release
the switch trigger to stop.
For tool with lock button
CAUTION:
• Switch can be locked in "ON" position for ease of
operator comfort during extended use. Apply caution
when locking tool in "ON" position and maintain firm
grasp on tool.
To start the tool, simply pull 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, and 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)
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. (Fig. 3)
Installing or removing wheel guard (For
depressed center wheel/Multi disc)
CAUTION:
• When using a depressed center grinding wheel/Multi-
disc, the wheel guard must be fitted on the tool so that
the closed side of the guard always points toward the
operator.
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 to such an angle that it can
protect the operator according to work. Be sure to tighten
the screw securely. (Fig. 4)
To remove wheel guard, follow the installation procedure
in reverse.
Installing or removing depressed center
grinding wheel/Multi-disc (optional
accessory)
WARNING:
• Always use supplied guard when depressed center
grinding wheel/Multi-disc is on tool. Wheel can shatter
during use and guard helps to reduce chances of
personal injury.