Global Machinery Company MX1G100 - Manual (Page 10)

10
Chuck replacement
Always wear eye protection.
Chuck removal
The chucks of reversible drills are always fixed by a screw
with left-hand thread. The screw, which is located in the
centre of the chuck, must be removed before the chuck can
be removed.
1. Tighten the chuck around the shorter end of a hex key
(not supplied) of 1/4” or greater size. Using a wooden
mallet or similar object, strike the longer end in the
clockwise direction. This will loosen the screw inside the
chuck.
2. Open chuck jaws fully.
3. Insert a screwdriver into front of chuck between jaws to
engage screw head. Remove screw by turning clockwise.
4. Place a hex key in chuck and
tighten. Using a wooden mallet or
similar object, strike key sharply in
the counterclockwise direction. This
will loosen the chuck so that it can
be unscrewed by hand.
Chuck installation
1. Screw the chuck on by hand as far as it will go and insert
screw (LH thread).
2. Tighten the chuck around
the shorter end of a
1/4” or large hex key (not
supplied) strike the longer
end in the clockwise
direction with a wooden
mallet.
3. Remove the hex key and open the jaws fully. Tighten the
screw in the centre of the chuck firmly.
Hints for use
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.
• Use only correctly sharpened drill bits, which are suitable
for the material being drilled.
• To drill hard materials, firm pressure is required on the
power tool. However, excessive pressure does not
improve performance and places unnecessary pressure
on the tool and its bit.
• When screw driving always use a pilot hole and set the
speed dial to low. Press firmly on the screw head and pull
the trigger gradually increasing the speed. It is always
wiser to test the screw driving on a scrap piece of the
same material you are using.
• 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
a little more of the work. If the job is too hard for the drill
do not continue otherwise permanent damage to the
motor will occur.
• Wire brushing or sanding should be carried out on the
highest speed.
• Concrete drilling should be carried out on the highest
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.