Clarke CHD850B Instruction Manual

OPERATION & MAINTENANCE
INSTRUCTIONS
GC0416
850W HAMMER DRILL
MODEL NO: CHD850B
PART NO: 6479502

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INTRODUCTION
Thank you for purchasing this CLARKE Hammer Drill.
Before attempting to use this product, please read this manual thoroughly and
follow the instructions carefully. In doing so you will ensure the safety of yourself
and that of others around you, and you can look forward to your purchase
giving you long and satisfactory service.
Please keep these instructions in a safe place for future reference.
ENVIRONMENTAL PROTECTION
Recycle unwanted materials instead of disposing of them as waste.
All tools, accessories and packaging should be sorted, taken to a
recycling centre and disposed of in a manner which is compatible
with the environment.
Through purchase of this product, the customer is taking on the obligation to
deal with the WEEE in accordance with the WEEE regulations in relation to the
treatment, recycling & recovery and environmentally sound disposal of the
WEEE.
In effect, this means that this product must not be disposed of with general
household waste. It must be disposed of according to the laws governing
Waste Electrical and Electronic Equipment (WEEE) at a recognised disposal
facility.
SAFETY SYMBOLS
The above safety symbols appear on the product.
Read instruction
manual before use
Wear ear defenders
Wear dust mask Wear safety glasses

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SAFETY PRECAUTIONS
WORK AREA
1. Keep work area clean and well lit. Cluttered and dark areas invite
accidents.
2. Do not operate power tools in explosive atmospheres, such as in the
presence of flammable liquids, gases or dust. Power tools create sparks
which may ignite the dust or fumes.
3. Keep children and bystanders away while operating a power tool.
Distractions can cause you to lose control.
4. Avoid body contact with earthed or grounded surfaces such as pipes,
radiators, ranges or refrigerators. There is an increased risk of electric shock
if your body is earthed or grounded.
5. Do not expose power tools to rain or wet conditions. Water entering a
power tool will increase the risk of electric shock.
6. When operating a power tool outdoors, use an extension cable suitable for
outdoor use. Use of a cable suitable for outdoor use reduces the risk of
electric shock.
PERSONAL SAFETY
1. Stay alert, watch what you are doing and use common sense when
operating a power tool. Do not use a power tool while you are tired or
under the influence of drugs, alcohol or medication. A moment of
inattention while operating power tools may result in personal injury.
2. Use safety equipment. Always wear eye protection. Safety equipment such
as dust mask, non-skid safety shoes, or hearing protection used for
appropriate conditions will reduce personal injuries.
3. Avoid accidental starting. Ensure the switch is in the off position before
connecting to the power supply.
4. Do not overreach. Keep proper footing and balance at all times. This
enables better control of the power tool in unexpected situations.
5. Dress properly. Do not wear loose clothing or jewellery. Keep your hair,
clothing and gloves away from moving parts. Loose clothes, jewellery or
long hair can be caught in moving parts.
WARNING: READ ALL INSTRUCTIONS. FAILURE TO FOLLOW ALL
INSTRUCTIONS LISTED BELOW MAY RESULT IN ELECTRIC SHOCK, FIRE AND/
OR SERIOUS INJURY. THE TERM “POWER TOOL” IN ALL WARNINGS LISTED
BELOW REFERS TO YOUR 850W HAMMER DRILL.

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POWER TOOL USE AND CARE
1. Do not force the power tool. Use the correct power tool for your
application. The correct power tool will do the job better and safer at the
rate which it was designed.
2. Do not use the power tool if the switch does not turn it on and off. Any
power tool that cannot be controlled with the switch is dangerous and
must be repaired.
3. Disconnect the battery before making any adjustments, changing
accessories, or storing power tools. Such preventive safety measures
reduce the risk of starting the power tool accidentally.
4. Store idle tools out of the reach of children and do not allow persons
unfamiliar with the power tool or these instructions to operate the power
tool. Power tools are dangerous in the hands of untrained users.
5. Maintain power tools. Check for misalignment or binding of moving parts,
breakage of parts and any other condition that may affect the power tools
operation. If damaged, have the power tool repaired before use. Many
accidents are caused by poorly maintained power tools.
6. Keep cutting tools sharp and clean. Poorly maintained cutting tools with
sharp cutting edges are less likely to bind and are easier to control.
7. Use the power tool and accessories in accordance with these instructions
and in the manner intended for the particular type of power tool, taking
into account the working conditions and the work to be performed. Use of
the power tool for operations different from intended could result in a
hazardous situation.
HAMMER DRILL SAFETY INSTRUCTIONS
1. Only use the drill in the manner and for the functions described.
2. Using the correct bit. Use the appropriate drill bit for the material being
drilled. Different bits are available from your Clarke dealer.
3. Use of the mains cable. Keep the mains cable well away from the drill and
ensure an adequate electrical supply is close at hand so that the
operation is not restricted by the length of the cable.
4. Working on the bench. Allow sufficient clearance beneath the work to
ensure the drill bit does not come into contact with the floor, table etc.
5. Switching off. Never place the drill on a table or bench if it has not
completely stopped. The drill bit will continue to rotate for a short time after
the trigger has been released to stop the drill.
6. Drilling into walls. Do not drill into walls or cavities before checking for
hidden electrical wires or water pipes etc.

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7. Finishing drilling. Do not touch the drill bit immediately after use, allow time
for it to cool.
8. Use outdoor extension leads. If working outdoors, always use an approved
cable extension suitable for the power rating of this tool (see
specifications), the conductor size should also be at least the same size as
that on the machine, or larger. When using a cable reel, always unwind the
cable completely. We strongly recommend that this machine is
connected to the mains supply via a Residual Current Device (RCD).
9. Cooling agents. When drilling metals, always use a cooling agent i.e.
cutting/soluble oil.
SERVICE
1. Have your power tool serviced by a qualified repair person using only
identical replacement parts. This will ensure that the safety of the power
tool is maintained.
SPECIFICATIONS
Item Specification
Operating Modes Drill or Drill & Hammer Action/Reverse
Chuck Capacity 1.5 mm -13 mm
Rated No-load Speed 0 - 2800 rpm
Weight 2.17 kg
Impact Rate 4200 blows/min
Rated Drilling Capacity (mm) Wood, 32/ Steel, 12 / Masonary,16
Dimensions (L x W x H) 313 x 67 x 207 mm
Operating voltage & Frequency 230V~50Hz
Fuse rating 13 A
Motor Power 850W
Sound Pressure Level 91.34 dB LpA
Sound Power Level 102.34 dB LWA
Vibration Level using 6 mm drill bit
Vibration Level using 8 mm drill bit
Front 6.228 m/s2, Aux. 5.017 m/s2
Front 15.163 m/s2, Aux. 9.601 m/s2

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ELECTRICAL CONNECTIONS
This product battery charger is provided with a standard 13 amp, 230 volt
(50Hz), BS 1363 plug, for connection to a standard, domestic electrical supply.
Should the plug need changing at any time, ensure that a plug of identical
specification is used.
If the colours of the wires in the power cable of this product do not correspond
with the markings on the terminals of your plug, proceed as follows.
• The wire which is coloured Blue must be connected to the terminal
which is marked Nor coloured Black.
• The wire which is coloured Brown must be connected to the terminal
which is marked Lor coloured Red.
We strongly recommend that this machine is connected to the mains supply
via a Residual Current Device (RCD)
If in any doubt, consult a qualified electrician. DO NOT attempt any repairs
yourself.
This symbol indicates that this is a Class II product, and does not require
an earth connection.
WARNING! Read these electrical safety instructions thoroughly
before connecting the product to the mains supply.
WARNING! The wires in the power cable of this product are
coloured in accordance with the following code:
Blue = Neutral Brown = Live
Plug must be BS1363/A approved.
Always fit a 5 Amp fuse.
Ensure that the outer sheath of the cable is firmly held by the clamp
Neutral
(Blue)
Live
(Brown)

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OVERVIEW
The CLARKE CHD850B is a variable-speed hammer drill designed for DIY use. It
is equipped with a variable speed control and hammer operation. It also has
a lock-on button for continuous operation.
When unpacking, check for damage or shortages etc. Any found should be
reported to your CLARKE dealer where the drill was originally purchased. This
drill is supplied with the following components:
• 1 x Hammer Drill
• 1 x Chuck Key
• 1 x Depth Stop Rod
• 1 x Auxiliary (Side) Handle

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OPERATION
IMPORTANT: To avoid accidental starting, ensure the drill is switched OFF
before plugging in to the mains. To do this, briefly pull the switch, and
release to ensure the trigger lock is not set in the ‘lock’ position.
INSERTING A DRILL BIT
1. Open the chuck by rotating the
chuck sleeve anticlockwise until
the jaws are open sufficiently to
take the drill bit.
2. Place the drill bit in the jaws of the
chuck as far as it will go.
3. Insert the chuck key in one of the
three holes in the chuck and
tighten in a clockwise direction.
• Make sure that the head of the
chuck key is located on the cog barrel of the chuck when
tightening.
• To remove the bit, release the jaws by inserting the chuck key in one
of the holes and turning in an anticlockwise direction.
SWITCHING ON & CONTINUOUS OPERATION
1. Plug into a 13amp socket and squeeze the trigger to start the drill.
2. During use, press the trigger lock-on button and the drill will run
continuously. Squeeze the trigger again briefly to release the trigger lock &
stop the drill.
WARNING: REMOVE THE CHUCK KEY BEFORE OPERATING THE DRILL.

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HAMMER DRILL SELECTION
Slide the drill/hammer drill mode
selector switch to the ‘Hammer’
symbol on the drill body.
NORMAL DRILL SELECTION
Slide the drill/hammer drill mode
selector switch to the ‘Drill’ symbol
on the drill body.
NOTE: Both these operations should
only be performed when the drill is at
a complete stop.
FORWARD / REVERSE SELECTION
1. Set the forward/reverse selector
switch to the position marked ‘R’
for normal ‘Right Hand’ (forward)
rotation for drilling holes.
2. Set the forward/reverse selector
switch to the position marked ‘L’
for ‘Left Hand’ (reverse) rotation
to reverse the drill out of the
workpiece.
NOTE: This operation should only be
performed when the drill is at a complete stop.
SPEED SELECTION
1. Turn the variable speed control in
the centre of the trigger until the
drill runs at your chosen speed.
2. The drill can be locked runnning
by pressing the lock-on button
after the trigger is squeezed.
3. To stop the drill, just squeeze the
trigger again.

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AUXILIARY HANDLE
1. Fit the handle by loosening it off
prior to sliding it over the chuck
and onto the body of the drill.
2. Rotate the handle to the desired
position and secure in position by
twisting the handle grip clockwise.
DEPTH STOP
1. The depth stop is fitted within the
auxiliary handle and can only be
used if the handle is installed.
2. Loosen the handle and insert the depth stop rod through the holder in the
handle assembly.
3. Slide the rod in and out to the required position. Lock in place by turning
the handle clockwise.
GENERAL DRILLING TECHNIQUE
• After drilling material to the full depth, maintain chuck rotation to
ease drill withdrawal.
• Always drill directly in line with the bit. Do not use sideways
movement as this may damage the drill or cause the bit to break.
• If the drill is not cutting the metal then sharpen the drill bits, ensuring
the various cutting angles are correct.
• Always use sharp, good quality drill bits. The performance of your drill
is dependant on the quality of the bits used.
• Reduce the pressure on the drill bit when it is about to break through.
This will prevent the drill from jamming.
• If drilling a large hole, first drill a pilot hole using a smaller drill bit.
• Always apply pressure to your drill bit in a straight line and, where
possible, at right angles to the workpiece.
• When drilling holes or driving screws into walls, floors etc., always
make sure that there are no live electrical wires in the path of the bit.
• When drilling in metal, the materials being drilled can become hot.
To reduce overheating use a suitable cooling lubricant. No cooling
lubricant is necessary when drilling cast iron or brass as they should
be drilled dry.
• When drilling metal, the harder the metal the slower the drill speed.
Similarly, the bigger the drill bit the slower the speed.

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• To prevent the drill bit from slipping when starting to drill a hole in
metal, use a centre punch to make an indentation at the start point.
• Always start drilling at the slowest speed to prevent the drill from
slipping out of the pop mark or indent.
• Select the speed according to the drill bit being used whilst
maintaining a MODERATE pressure ONLY. NEVER force the drill bit into
the work. This will overheat the tip and cause it to dull very quickly.
• When drilling in wood, clamp a piece of scrap wood to the
underside of the material to avoid splintering.
• Always drill directly in line with the bit. Do not use sideways
movement as this may damage the drill or cause the bit to break.
• Large holes should be drilled with wood augers, flat wood bits or
hole saws.
MAINTENANCE
Before commencing any maintenance procedures, always ensure the drill is
isolated from the electrical supply by switching off and removing the plug
from the socket.
BEFORE USE
1. Inspect the power cable to ensure it is sound and free from cracks, bare
wires etc.
CLEANING
1. Ensure all air ventilation slots are clear of blockages, (use compressed air to
clean the machine if possible).
2. After use, clean all dust and swarf from the drill.
3. Clean the exterior of the drill with a soft cleaning cloth. Never use any
chemicals/ solvents or harsh abrasives to clean the drill.
GENERAL MAINTENANCE
• All bearings etc, in this tool are lubricated with a sufficient amount of
high grade lubricant for the tools lifetime under normal operating
conditions, therefore no further lubrication is necessary.
• Refer to your CLARKE dealer if internal maintenance is required.

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FAULTFINDING
Problem Possible Cause Remedy
Tool will not operate No power supply Check supply & rectify as
necessary
Switch is faulty Consult your Clarke
dealer
Fuse blown Check & replace if
necessary
Motor is faulty Consult your Clarke
dealer
Motor runs but drill bit
does not move.
Drill fastening not tight Secure drill bit
Drive gear broken Consult your Clarke
dealer
Heavy internal sparking Faulty motor Consult your Clarke
dealer
Warn brushes Consult your Clarke
dealer
Motor becomes hot Unduly heavy use Reduce the force applied
to the tool. Let the tool do
the work
Air vent have become
blocked
Clean out the air vents
using compressed air or
clean with a dry cloth
Low supply voltage Ensure supply voltage is
correct. If an extension
cable is used, ensure it is
the correct rating and is
fully unwound
Excessive vibration. Drill bit bent or not
mounted correctly
Check and rectify
Machine bearings worn Consult your Clarke
dealer

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COMPONENT PARTS LIST
When ordering spare parts please quote the reference WGCHD850B followed
by the number above.
An extensive selection of accessories including Drill Bit Sets, Socket & Bit Sets
and Drill Bit Sharpeners are available from your CLARKE dealer.
The following drill bit sets are suggested for use with your hammer drill.
CHT342 - 30 Piece Titanium Coated HSS Drill Set (Imperial Sizes)Part No: 1801342
CHT348 - 30 Piece Titanium Coated HSS Drill Set (Metric Sizes) Part No: 1801348
Titanium coated HSS bits last up to 6 times longer than standard bits which can
be sharpened using a Clarke Drill Sharpener such as the CBS43 or the CBS16.
CHT383 - 19 Piece (Metric) Cobalt Steel Drill Set Part No: 1801383
CHT384 - 25 Piece (Metric) Cobalt Steel Drill Set Part No: 1801384
Suitable for drilling carbon steel, super alloys, titanium and stainless steel.
No Description No Description
1 Chuck Retaining Screw 18 Carbon Brush Holder
2 Chuck Cable 19 Screw
3 Drive Spindle 20 Motor Bearing 607
4 Woodruff Key 21 Torsion Spring
5 Impact Spring 22 Inductor
6 Bearing 6001 23 Motor Stator
7 Carbon Brush Holder 24 Trigger Assembly
8Gear 25Capacitor
9 Circlip 26 X-head Screw
10 Drive Support Block 27 Cable Clamp
11 Impact Piece 28 Power Cable & Plug
12 Impact Selector 29 Cable Sleeve
13 Bearing 30 Casing (LH)
14 Motor Fan 31 Casing (RH)
15 Motor Rotor 32 Casing Screw
16 Carbon Brush 33 Auxiliary Handle
17 Brush Spring 34 Depth Stop Rod

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COMPONENT PARTS
GUARANTEE
This product is guaranteed against faulty manufacture for a period of 12
months from the date of purchase. Please keep your receipt which will be
required as proof of purchase.
This guarantee is invalid if the product is found to have been abused or
tampered with in any way, or not used for the purpose for which it was
intended.
Faulty goods should be returned to their place of purchase, no product can
be returned to us without prior permission. This guarantee does not effect your
statutory rights.

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DECLARATION OF CONFORMITY