RIDGID R8411503 Operator's Manual page 11

OPERATION
TWO-SPEED GEAR TRAIN
See Figure 5.
The drill has a two-speed gear train designed for drilling or
driving at LO (1) or HI (2) speeds. A slide switch is located on
top of the drill to select either LO (1) or HI (2) speed. When
using drill in the LO (1) speed range, speed will decrease
and unit will have more power and torque. When using drill in
the HI (2) speed range, speed will increase and unit will have
less power and torque. Use LO (1) speed for high power
and torque applications and HI (2) speed for fast drilling or
driving applications.
NOTE: If you have difficulty changing from one gear range to
the other, turn the chuck by hand until the gears engage.
CAUTION:
Never change gears while the tool is running.
Failure to obey this caution could result in serious
damage to the drill.
ADJUSTABLE TORQUE CLUTCH
This product is equipped with an adjustable torque clutch
for driving different types of screws into different materials.
The proper setting depends on the type of material and the
size of screw you are using.
ADJUSTING TORQUE
See Figure 6.
There are twenty-four torque indicator settings located on
the front of the drill.
 Rotate the adjusting ring to the desired setting.
•  - 4 For driving small screws
• 5 - 8 For driving screws into soft material
• 9 -  For driving screws into soft and hard
materials
• 3 - 6 For driving screws into hard wood
• 7 - 3 For driving large screws
• For heavy drilling
SELECTING HAMMER MODE OR DRILLING
MODE
See Figure 7.
To adjust for type of drilling, turn the hammer mode ring
on top of the motor housing to hammer mode or drilling
mode.
NOTE: The hammer drill has not been designed for reverse
hammering.
Use carbide-tipped bits and select hammer mode when
drilling in hard materials such as brick, tile, concrete, etc.
Select normal drill mode when drilling with twist drills, hole
saws, etc., in soft materials.
NOTE: When drilling in hammer mode, it is advisable to use
LO (1) Speed. For best performance when in hammer mode,
select the drill icon ( ) on the torque adjustment ring.
GEAR TRAIN (HI-LO)
SPEED
TO DECREASE
TORQUE
TO INCREASE
TORQUE
HAMMER
MODE

TWO SPEED
SPEED
1
2
HI
ADJUSTING
RING
HAMMER MODE
DRILLING MODE
HAMMER MODE
RING
DRILLING
MODE
LO
Fig. 5
Fig. 6
Fig. 7