Makita 4191D Instruction Manual page 7

CAUTION:
• The battery charger is for charging Makita battery cartridge. Never use it for other purposes or for other manufac-
turer's batteries.
• When you charge a new battery cartridge or a battery cartridge which has not been used for a long period of time, it
may not accept a full charge. This is a normal condition and does not indicate a problem. You can recharge the bat-
tery cartridge fully after discharging it completely and recharging a couple of times.
• If you charge a battery cartridge from a just-operated tool or a battery cartridge which has been left in a location
exposed to direct sunlight or heat for a long time, the charging light may flash in red color. If this occurs, wait for a
while. Charging will begin after the battery cartridge cools. The battery cartridge will cool faster if you remove the
battery cartridge from the fast charger.
• If the charging light flashes alternately in green and red color, a problem exist and charging is not possible. The ter-
minals on the charger or battery cartridge are clogged with dust or the battery cartridge is worn out or damaged.
Trickle charge (Maintenance charge)
If you leave the battery cartridge in the charger to prevent spontaneous discharging after full charge, the charger will
switch into its "trickle charge (maintenance charge)" mode and keep the battery cartridge fresh and fully charged.
Tips for maintaining maximum battery life
1. Charge the battery cartridge before completely discharged. Always stop tool operation and charge the battery
cartridge when you notice less tool power.
2. Never recharge a fully charged battery cartridge. Overcharging shortens the battery service life.
3. Charge the battery cartridge with room temperature at 10°C – 40°C (50°F – 104°F).
Let a hot battery cartridge cool down before charging it.
4. Charge the Nickel Metal Hydride battery cartridge when you do not use it for more than six months.
Installing or removing diamond wheel
(Fig. 6 & 7)
Important:
Always be sure that the tool is switched off and the bat-
tery cartridge is removed before installing or removing
the wheel.
To install the wheel, first loosen the bolt with the hex
wrench and remove the bolt and outer flange. Then
mount the wheel, outer flange and bolt. The wheel
should be mounted with the Makita name facing outside.
Press the shaft lock so that the wheel cannot revolve.
Use the hex wrench to tighten the bolt securely.
To remove the wheel, follow the installation procedure in
reverse.
CAUTION:
• When installing the wheel, be sure to tighten the bolt
securely.
• Use only the Makita hex wrench to install or remove the
wheel.
Installing water supply
Attach the tank holder on the tank. The tank holder
should be attached around the portion shown with the
dotted line. Tighten the screw (A) to the extent that the
tank can still turn within the tank holder. (Fig. 8)
Attach the tank holder onto the motor housing. Tighten
the screw (B) securely. (Fig. 9)
Connect the cap on the end of the polyvinyl tube to the
mouth of the tank. Turn the tank clockwise when making
the connection. Then tighten the screw (A) securely to
secure the tank. (Fig. 10)
CAUTION:
If you find the polyvinyl tube is bent like a "V" or has been
strained excessively after installing the water supply,
loosen the screw (B) and adjust the position of the tank to
alleviate the bent, pinched or strained condition.
Hex wrench storage (Fig. 11)
When not in use, the hex wrench can be conveniently
stored.
Adjusting the depth of cut (Fig. 12 & 13)
Loosen the clamp screw on the depth guide and move
the base up and down. You can read the depth of cut by
aligning the top of the notch in the depth guide with the
graduations on its right side. (Note: This can be done for
0° bevel cutting only.) At the desired depth of cut, secure
the base by tightening the clamp screw.
CAUTION:
• Use a shallow depth of cut when cutting thin workpiece
for cleaner, safer cuts.
• After adjusting the depth of cut, always tighten the
clamp screw securely.
Bevel cutting (Fig. 14)
Loosen the clamp screw on the bevel scale plate on the
front of the base. Set for the desired angle (0° – 45°) by
tilting accordingly, then tighten the clamp screw securely.
CAUTION:
After adjusting the depth of cut and bevel cutting angle,
be sure to tighten the clamp screw.
Sighting (Fig. 15)
The front of the base is notched to provide two guide
edges. For straight cuts, align the edge with 0° engraved
on it with your cutting line on the workpiece. For 45° bevel
cuts, align the edge with 45° engraved on it with your cut-
ting line.
Switch action (Fig. 16)
CAUTION:
Before inserting the battery cartridge into the tool, always
check to see that the switch trigger actuates properly and
returns to the "OFF" position when released.
To prevent the trigger from being accidentally pulled, a
lock-off lever is provided. To start the tool, slide the lock-
off lever in the direction of the arrow and pull the trigger.
Release the trigger to stop.
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