Operation - Hilti SF 144-A Operating Instructions Manual

7 Operation

en
CAUTION
The tool may get hot during use. Wear protective gloves.
CAUTION
The power tool may suddenly swing to the side (rotate
about its own axis) when drilling, hammer drilling or
screwdriving. Always use the power tool with the side
handle fitted and hold it securely with both hands.
CAUTION
To avoid injuries caused by the insert tool, wear
protective gloves when changing insert tools.
7.1 Setting forward or reverse rotation 3
NOTE
The forward / reverse switch is used to select the direction
of rotation of the drive spindle. An interlock prevents
switching while the motor is running. The control switch
is locked when the forward / reverse switch is in the
middle position. Push the forward / reverse switch to
the right (power tool held in working direction) to select
forward rotation. Push the forward / reverse switch to
the left (power tool held in working direction) to select
reverse rotation.
7.2 Adjusting the side handle 4
1. Release the side handle clamping band by turning
the handle counterclockwise.
2. Pivot the side handle into the desired position.
3. Tighten the side handle by turning the grip clock-
wise.
4. Check that it holds securely.
7.3 Speed selection
7.3.1 Speed selection using the 2-speed gear
switch (SF 144-A) 5
NOTE
The mechanical 2-speed gear switch can be used to
select the speed range required. Speed with fully-charged
battery. 1st gear: 0‑380 r.p.m. or 2nd gear: 0‑1440 r.p.m.
7.3.2 Speed selection using the 3-speed gear
switch (SFH 144-A) 6
NOTE
The mechanical 3-speed gear switch can be used to
select the speed range required. Speed with fully-charged
battery. 1st gear: 0‑350 r.p.m., 2nd gear: 0‑1360 r.p.m.
or 3rd gear: 0‑1900 r.p.m.
8
7.4 Switching on / off
CAUTION
To avoid damage to the power tool, the switch must
be released (switched off) if the motor is stalled for
more than 2-3 seconds. After stalling, the power tool
must be allowed to run for 2 minutes under no load.
The speed of the power tool can be controlled smoothly
(increased from zero to maximum) by pressing the control
switch gradually.
7.5 Drilling
CAUTION
Use clamps or a vice to secure the workpiece. The
workpiece is thus held more securely than by hand
and both hands remain free to operate the power tool.
7.5.1 Fitting the drill bit
1. Set the forward / reverse switch to the middle posi-
tion or remove the battery from the power tool.
2. Check that the connection end of the drill bit is
clean. Clean the connection end if necessary.
3. Insert the drill bit in the chuck and then turn the
chuck sleeve until tight.
4. Check that the drill bit is held securely (check by
pulling).
7.5.2 Drilling
1. Move the forward / reverse switch to the "Forward"
position.
2. Turn the torque and operating mode setting ring to
the drilling symbol.
7.5.3 Removing the drill bit
1. Set the forward / reverse switch to the middle posi-
tion or remove the battery from the power tool.
2. Open the quick-release chuck.
3. Pull the insert tool out of the chuck.
7.6 Hammer drilling (SFH 144-A)
7.6.1 Fitting the drill bit
1. Set the forward / reverse switch to the middle posi-
tion or remove the battery from the power tool.
2. Check that the connection end of the drill bit is
clean. Clean the connection end if necessary.
3. Insert the drill bit in the chuck and then turn the
chuck sleeve until tight.
4. Check that the drill bit is held securely (check by
pulling).