Fitting The Keyed Chuck - GMC CRHD950 Manuel D'instructions

3. Pneumatic hammer action
For highly efficient drilling into
brick and masonry (Fig. M).
Note. When drilling into
masonry, the drilling rate is fast
and burnout of the tip will occur if
the drill bit is not constantly
cleared (Fig. N).
GB
IMPORTANT. Use SDS-Plus drill
bits only.
4. Rotation only (non
pneumatic hammer
action drilling)
For general drilling into
metal and wood (Fig. O).
Note. In this mode the
13mm keyed chuck adaptor
should be used.
• Use only correctly sharpened
drill bits, which are suitable for
the material being drilled.
• Rotary hammer drills work
more effectively if excessive
force is not used, allowing the
hammer action to function to
maximum efficiency.
• As this machine is not designed for high torque
screwdriving applications, it is not recommended for this
purpose.
• Larger diameter holes in hard wood, steel and concrete
have to be drilled at slower speeds. However, the motor
must not be struggling with the operation. If the motor is
struggling DO NOT continue working, pull the drill clear of
the workpiece and run it on fast speed for a minute or so,
allowing the motor time to cool down before you attempt
more of the work. If the job is too hard for the drill, do not
continue, otherwise permanent damage to the motor will
occur.
• Concrete drilling should be carried out on the highest
M
speed. DO NOT overload motor when drilling concrete.
DO NOT use too much pressure as the hammer action
relies on the drill bit being able to move back and forward
in the hole being drilled. Always clear the flutes of the drill
bit by removing it from the hole regularly.

Fitting the keyed chuck

The Keyed Chuck (7) supplied as an accessory can be
fitted to the SDS-Plus chuck with the use of the SDS-Plus
Chuck Adaptor (5).
N
1. The keyed chuck allows bits with a straight shank to be
used with the tool.
2. Grip and pull back the Locking Sleeve (10) and insert the
SDS-Plus Chuck Adaptor (5) (Fig. P).
O
3. It may be necessary to turn the SDS-Plus chuck adaptor
in order for it to locate properly (Fig. Q).
4. Release the Locking Sleeve (10) to lock the adaptor in
place (Fig. R).
10
P
R
Q
S