Maintenance - GMC GCHD18 Original Instructions Manual

Torque control
Note: This cordless drill is equipped with a torque control clutch allowing the machine to be set to the correct
torque for the individual application.
• The clutch settings are indicated by the symbols on the Torque Selector (3)
• Rotate the Torque Selector to select the desired setting: the higher the number displayed on the torque
ring, the higher the torque produced by the tool
Gear selection
• Select gear 1 on the Gear Switch (5) for the higher torque. A lower speed gear is generally more suitable
for driving screws and fasteners
• Select gear 2 on the Gear Switch for the lower torque. A higher speed gear is for drilling and must not be
used for driving screws and fasteners
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Note: ALWAYS read the documentation provided with drill bits and accessories for the recommended or
maximum speed setting and use the most appropriate gear. See 'Specification' for the maximum no load
speed of each gear.
Switching on/off
WARNING: ALWAYS wear adequate personal protection equipment when setting up and operating this
machine.
1. To start the drill, squeeze the Trigger Switch (8)
2. The built-in Work Light (10) will illuminate when the Trigger Switch is squeezed
Note: If the Trigger Switch cannot be pressed down, check that the Forward/Reverse Switch (7) is not set to its
middle position, which locks the device (see 'Direction control').
3. The speed of the drill is controlled by the movement of the trigger: the further the Trigger Switch is
pressed down, the faster the drill will run
4. Release the Trigger Switch to stop the machine
Screwdriver use
Note: Always use a universal bit holder when working with screwdriver bits. Do not mount screwdriver bits
directly into the chuck.
1. Select gear 1 using the Gear Switch (5)
2. Rotate the Mode Selector (4) to Drive
3. Adjust the drill to the appropriate torque setting (see 'Torque control')
• When driving screws NEVER use the machine in drill mode
Note: If in doubt which torque setting best suits the application, start with a low setting and increase, should
more torque be required (e.g. if the screw is not being driven far enough into the workpiece).
Drilling masonry and concrete
1. Select the appropriate gear using the Gear Switch (5)
2. Rotate the Mode Selector (4) to the hammer drill position
• Hammer drill mode should be used for drilling into masonry and concrete
• Apply moderate pressure to the rear of the drill, in line with the drill bit
• Use masonry drill bits only. Ensure that the bit size is within the maximum capacity of the machine (see
'Specification')
• DO NOT apply too much pressure. If debris blocks the drill hole, run the drill slowly and remove the bit
from the hole. Repeat until hole is cleared
WARNING: The drill bit, especially the tip, will become very hot when drilling masonry and concrete. DO NOT
touch the bit and never allow it to come into contact with combustible materials.
WARNING: DO NOT inhale masonry dust. Wear adequate breathing protection. Dust from masonry, concrete
and similar substances is harmful and may be toxic.
Drilling wood
1. Select the appropriate gear using the Gear Switch (5)
2. Rotate the Mode Selector (4) to the drill position
• Ensure that drill bits are suitable for wood, and are within the maximum capacity of this machine (see
'Specification')
WARNING: DO NOT inhale wood dust. Wear adequate breathing protection. Some wood dusts may be
toxic.
Drilling metal
• Select the appropriate gear using the Gear Switch (5)
• Rotate the Mode Selector (4) to the drill position
• Ensure that drill bits are suitable for the grade of metal being drilled, and are within the maximum
capacity of the machine (see 'Specification')
• To ensure accuracy, mark the intended hole position using a hammer and centre punch
WARNING: The drill bit and the workpiece will become very hot when drilling metal. DO NOT touch the bit
and never allow it to come into contact with combustible materials when hot. Always use a suitable lubricant
or cutting fluid, and drill at appropriate speeds.
• ONLY apply moderate pressure to the drill bit, ensuring efficient cutting and prolonged drill bit life
• Use a countersink bit to remove sharp burrs from the hole, preventing cuts and other kinds of injury
WARNING: If the power tool gets excessively hot in use, stop using the tool immediately and allow to cool
before continuing work. The cooling period can be reduced by operating the drill at maximum speed with no
load. Always make sure the Motor Vents (6) are not blocked and do not allow dust to enter the body of the tool
through the Motor Vents; dust, especially metallic dust, may damage or destroy the tool.
Accessories
• A full range of accessories including various types of drill and screwdriver bits is available from your GMC
stockist. Spare parts can be obtained from toolsparesonline.com

Maintenance

WARNING: ALWAYS disconnect from the mains power supply, before carrying out any maintenance/
cleaning of the charger. Remove the battery before carrying out any maintenance/cleaning of the drill.
Note: Both the drill and the charger contain no user-serviceable parts. If the device does not perform as
outlined in this manual, return it to an authorised GMC service centre for repair.
General inspection
• Regularly check that all the fixing screws are tight
• Inspect the supply cord of the tool, prior to each use, for damage or wear. Repairs should be carried out by
an authorised GMC service centre. This advice also applies to extension cords used with this tool
Cleaning
• Keep your tool clean at all times. Dirt and dust will cause internal parts to wear quickly, and shorten the
machine's service life. Clean the body of your machine with a soft brush, or dry cloth. If available, use
clean, dry, compressed air to blow through the ventilation holes
• Clean the tool casing with a soft damp cloth using a mild detergent. Do not use alcohol, petrol or strong
cleaning agents
• Never use caustic agents to clean plastic parts
Lubrication
• Slightly lubricate all moving parts at regular intervals with a suitable spray lubricant
Storage
• Store this tool carefully in a secure, dry place out of the reach of children
Disposal
Always adhere to national regulations when disposing of power tools that are no longer functional and are
not viable for repair.
• Do not dispose of power tools, or other waste electrical and electronic equipment (WEEE), with household
waste
• Contact your local waste disposal authority for information on the correct way to dispose of power tools
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