Hints For Use; Gearbox Maintenance; Maintenance - 909 KHD1050K Instruction Manual

1050w rotary hammer drill
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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, apply enough firm pressure only to
safely control the powertool. Excessive pressure does not
improve performance and places unnecessary pressure
on the tool and its bit.
• When driving screws, always use a pilot hole and set the
speed dial to low.
• 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.
• 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.
WARNING.
This tool is not designed for high torque
applications such as screwdriving. Such use will damage
the motor.

Gearbox maintenance

1. Carry out the following procedure after each period of
approximately 6 hours of use.
2. Remove the gear case access
cover (3) located on top of the
drill.
3. Use wrench (13) to unscrew
the gearbox cover.
4. Use a spatula or similar
instrument to apply general
machinery grease into the
gearbox cavity until it is full.
5. Be careful not to scratch or otherwise damage the
mechanism.
6. Replace the cover (3).
CAUTION.
Do not over-tighten cover (3) or overfill the
gearbox with grease. If you run out of grease, or are not
sure how to change the grease, please take your product to
the nearest authorised service centre and have a qualified
person replace the grease.

Maintenance

WARNING.
Always ensure that the tool is switched off and
the plug is removed from the power point before making any
adjustments or maintenance procedures.
1. Keep the tool's air vents unclogged and clean at all times.
2. Regularly check to see if any dust or foreign matter has
entered the grills near the motor and around the trigger
switch. Use a soft brush to remove any accumulated
dust. Wear safety glasses to protect your eyes whilst
cleaning.
3. If the body of the drill needs cleaning, wipe it with a soft
damp cloth. A mild detergent can be used but nothing like
alcohol, petrol or other cleaning agent.
4. Never use caustic agents to clean plastic parts.
CAUTION.
Water must never come into contact with the
tool.
10

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