Master-force 241-0461, Operator'S Manual

Page 10

OPERATION

ELECTRIC BRAKE

To stop the drill/driver, release the trigger 
switch and allow the chuck to come to a 
complete stop. The electric brake quickly 
stops the chuck from rotating. This feature 
engages automatically when you release the 
trigger switch.

TWO-SPEED  

GEARBOX (FIG. 4)

LO

HI

FIG. 4

The drill/driver has a two-speed gearbox for 
drilling or driving at low or high speeds. A 
slide switch is located on the top of the drill/ 
driver to select either low or high speed. The 
required speed is adjusted depending on 
the material and the working conditions. 
Use low speed for high power and torque 
applications and high speed for fast drilling 
or driving applications.
When using drill/driver in the low speed 
range, the speed will decrease and the drill/
driver will have more power and torque. 
Use low speed for starting holes without 
a center punch, drilling metals or plastic, 
drilling ceramics, or in applications requiring 
a higher torque.
High speed is better for drilling wood and 
wood composites.

NOTICE: Avoid running the drill/driver at 
high speed for extended periods of time. 
Running at high speed under constant us-
age may cause the drill/driver to become 
overheated. 

 CAUTION:

 Never adjust the speed 

while the tool is running. Failure to obey 
this caution could result in serious damage 
to the drill/driver.

NOTICE: Make sure that the two-speed 
gearbox switch is fully adjusted at the front 
or the back position.

KEYLESS CHUCK (FIG. 5)

FIG. 5

The drill/driver has a keyless chuck to 
tighten or release bits in the chuck jaws. The 
arrows on the chuck indicate the direction in 
which to rotate the chuck in order to GRIP 
(tighten) or OPEN (release) the chuck jaws 
on the bit.

 WARNING:

 Do not hold the chuck 

with one hand and use the power of the 
drill/driver to tighten the chuck jaws on 
the drill bit. The chuck could slip in your 
hand, or your hand could slip and come 
in contact with the rotating bit. This could 
cause an accident resulting in serious 
personal injury.

GRIP (tighten)

OPEN 
(release)

Keyless chuck

Chuck jaws