Makita HM1242C User manual

Demolition Hammer
MODEL HMl242C
Variable Speed
INSTRUCTION MANUAL
DOUBLE
INSULATION
SPECIFICATIONS
Blows per minute I Overall length I Net weight
950 - 1,900 I 572 mm (22-3/4") I 9.3 kg (20.5Ibs)
~
Manufacturer reserves the right to change specifications without notice.
Note: Specifications may differ from country to country.
WARNING:
For your personalsafety, READ and UNDERSTAND before using.
SAVE THESE INSTRUCTIONS
FOR FUTURE REFERENCE.

GENERAL SAFETY RULES
(For All Tools)
WARNING! Read and understand all instructions. Failure
to follow all instructions listed below, may result in electric
shock, fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
READ ALL INSTRUCTIONS.
WORK AREA
1. Keepyour work areacleanandwell lit. Cluttered benchesand dark areasinvite
accidents.
2. Do notoperatepowertools in explosiveatmospheres, suchas in the presence
of flammable liquids, gases,
or dust. Power tools create sparks which may
ignite the dust or fumes.
3. Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to lose control.
ELECTRICAL SAFETY
4. DoubleInsulatedtools are equippedwithapolarizedplug(oneblade is wider
than the other.) This
plug will fit in a polarized outlet only one way. If the
plug does not
fit fully in the outlet, reverse the plug. If it still does not fit,
contact a qualified electrician to install a polarized outlet. Do not change
the plug
in any way. Double insulation El eliminates the need for the three
wire grounded power cord and grounded power supply system.
5. Avoidbody contact with groundedsurfaces such as pipes, radiators, ranges
and refrigerators. There is
an increased risk of electric shock if your body is
grounded.
6. Do notexpose powertools torain or wet conditions. Water enteringa power
tool will increase the risk of electric shock.
7. Do notabusethe cord. Never usethe cordtocarrythetools or pullthe plug
fromanoutlet. Keepcordaway fromheat, oil, sharpedges
or movingparts.
Replace damaged cords immediately. Damaged cords increase the risk of
electric shock.
8. Whenoperatingapowertooloutside, useanoutdoor extensioncordmarked
"W-A" or "W." These cords are rated for outdoor use and reduce the risk
of electric shock.
PERSONAL SAFETY
9. Stayalert, watchwhat youaredoing andusecommonsensewhenoperating
a power tool. Do not use tool while tired
or under the influence of drugs,
alcohol,
or medication. A moment of inattentionwhile operatingpowertools
may result
in serious personal injury.
IO. Dressproperly. Do notwear loose clothing or jewelry. Containlonghair. Keep
your hair, clothing, andglovesaway frommovingparts.Looseclothes,jewelry
or long hair can be caught
in moving parts.
2

11, Avoid accidental starting. Be sure switch is off before plugging in. Carrying
tools withyour finger on
the switchor plugging in tools that have the switch
on invites accidents.
12. Remove adjusting keys or wrenches before turning the tool on. A wrench
or
a key that is leftattachedto a rotatingpart of the tool may resultin personal
injury.
13. Donotoverreach. Keepproperfooting andbalanceatalltimes. Proper footing
and balance enables better control of the tool in unexpected situations.
14. Use safety equipment. Always wear eye protection. Dust mask, non-skid
safety shoes, hard hat, or hearing protection must be used for appropriate
conditions.
TOOL USE AND CARE
15. Use clamps or other practical way to secure and support the workpiece to
astable platform. Holdingthe work by hand or againstyour body is unstable
and may lead to
loss of control.
16. Do notforce tool. Usethe correct toolfor your application. The correct tool
will do the job better and safer
at the rate for which it is designed.
17. Do not use tool
if switch does not turn it on or off. Any tool that cannot
be controlled with
the switch is dangerous and must be repaired.
18. Disconnect
the plugfromthe power source beforemakingany adjustments,
changing accessories,
or storing the tool. Such preventivesafety measures
reduce the risk
of starting the tool accidentally.
19. Store idle tools out of reach of childrenand other untrained persons. Tools
are dangerous in the hands of untrained users.
20. Maintain tools with care. Keep cutting tools sharp and clean. Properly
maintainedtools, withsharpcutting edges are less likelyto bind and are easier
to control.
21. Check for misalignment or bindingof moving parts, breakageof parts, and
any other condition that may affect the tools operation.
If damaged, have
the tool serviced before using. Many accidents are caused by poorly main-
tained tools.
22. Use only accessoriesthat are recommended by the manufacturer for your
model. Accessoriesthat may be suitablefor one tool, may become hazardous
when used on another tool.
S ERVl CE
23. Tool service must be performedonly by qualified repair personnel. Service
or maintenance performed by unqualified personnelcould result in
a risk of
injury.
24. Whenservicing atool, use only identical replacement parts. Follow instruc-
tions in
the Maintenance section of this manual. Use of unauthorized parts
or failure tofollow MaintenanceInstructionsmay create
a riskof electricshock
or injury.
3

Specific Safety Rules
1. Hold tools by insulated gripping surfaces when performing an operation
where the cuttingtool may contact hidden wiring or itsowncord. Contact
with a"live" wire will makeexposedmetalparts of thetool "live" andshock
the operator.
2. Wear ear protectors when using the tool for extended periods. Prolonged
exposure to high intensity noise can cause hearing loss.
3. Wear a hardhat (safety helmet), safety glassesandlor face shield. It isalso
highly recommendedthat youwear a dust mask andthickly paddedgloves.
4. Be sure the bit is secured in place before operation.
5. Undernormaloperation, thetoolisdesignedtoproducevibration. Thescrews
can come loose easily, causing a breakdown or accident. Check tightness
of screws carefully before operation.
6. In cold weather or when the tool has not been usedfor a longtime, letthe
tool warm upfor a while by operating
it under no load. This will loosen up
the lubrication. Without proper warm-up, hammering operation isdifficult.
Be sure no one
is below when using the tool in high locations.
7. Always be sure you have a firm footing.
8. Hold the tool firmly with both hands.
9. Keep hands away from moving parts.
10. Do not leave the tool running. Operate the tool only when hand-held.
11. Do not pointthe tool at any one inthe area when operating. The bit could
12. Do not touch the bit or parts close tothe bit immediately after operation;
fly out and injure someone seriously.
they may be extremely hot and could burn your skin.
SAVE THESE INSTRUCTIONS.
4

SYMBOLS
The followings show the symbols usedfor tool.
v ................................. volts
A ................................. amperes
HZ ................................. herts
% ................................. alternatingcurrent
................................. Class II Construction
.../ min
................................ revolutionsor reciprocationper minute
@ ................................. number of blow
5

FUNCTIONALDESCRIPTION
Bit angle
The bit can be secured at 12 different angles. To change the bit angle, slide the change
ringforward, thenturn the changeringto changethe bit angle. At the desired angle, slide
thechange ringback totheoriginalposition. The bitwill be securedinplace.
NOTE:
The changeringcannot turnwhenthe bit is notinstalledon the tool.
Changering
I
I
Side handle(auxiliaryhandle)
The side handlecan be swung 360' on the
vertical and secured at any desired posi-
tion. Italso secures at eight different posi-
tions back and forth on the horizontal.Just
loosen the clamp nut
to swing the side
handle to
a desired position. Then tighten
theclamp nutsecurely.
The side handlealso can be mountedinthe
rear groove. Loosen the clamp nut and
widen the side handle base. Slide the side
handle back to the rear groove and secure
it with theclamp nut.
I Side handle
Loosen -Tighten
<
Side handlebase
6

Switchaction
CAUTION:
Beforeplugginginthe tool, always check to see thatthe tool isswitchedoff.
To start the tool, push the switch lever on
the left side of the tool. To stop the tool,
push the switch lever on the right side of
the tool.
Speedchange
The blowsper minutecan be adjusted between 950 and 1,900 BPMjust by turning the
adjustingdial.
This can bedone evenwhilethetoolisrunning.The dial ismarked 1 (lowest
speed)to
6 (fullspeed). Referto the table below for the relationshipbetweenthe number
settingson theadjustingdial and theblowsper minute.
Number Blows
onadiustingdial I per minute
6 I 1.900
5 I 1.800
4 I 1.550
1,300
1,050
I
Indicator lamp
The green power-ONindicator lamp lights up when the tool is switched ON. If the indi-
cator-lampis
lit but the.tooldoes not start,
the carbon brushes may be worn out,
or
the electric circuit or the motor may be
defective. If the indicator lamp does not
light up and the tool does not start, the
ON/OFF switch
or the mains cord may be
defective.
The red service indicator lamp lights up
when the carbon brushes are nearly worn
out to indicatethat the tool needsservicing.
After approx.
8 hours of use, the motorwill
automaticallybe shut
off.
Power-ON
indicator
lamp
(green)
Service
indicator
lamp
(red)
7

ASSEMBLY
Installingor removingbit
CAUTION:
Always be sure that the tool is switchedoff and unpluggedbeforeinstallingor removing
the bit.
This tool accepts
314" Hexagonal and
21/32" round shank bits. Clean the bit
shank and apply the bit grease providedto
it before installingthebit.
{,
Bit shank Bit Grease
Pullthetoolholdercover down all theway.
With the cut in the bit shank alignedwith the notch in the tool holder cap, insertthe bit
intothe tool holder.
Releasethe tool holder cover. It will returnautomaticallyto its original positionto secure
the bit.
After installing,always make sure that the bit is securely held in place by trying to pull it
out.
To removethe bit, pullthe toolholdercover down
all the way andpullthe bitout.
8

OPERATION
Chipping/Scaling/Demolition
Holdthe tool firmly with both hands. Turn
the toolon andapply slight pressureon the
tool
so that thetoolwill not bouncearound,
uncontrolled.Pressingvery hardonthe tool
will notincreasethe efficiency.
9

MAINTENANCE
CAUTl ON :
Always be sure that the tool is switchedoff and unpluggedbeforeattemptingto perform
inspection
or maintenance.
Replacingcarbonbrushes
Whenthe resininsulatingtip insidethe car-
bon brush
is exposedto contact the com-
mutator,
it will automatically shut off the
motor.
When this occurs, both carbon brushes
should be replaced. Keep the carbon
brushes clean and free to slip in the
holders. Both carbon brushes should be
replaced
at the same time. Use only iden-
ticalcarbonbrushes.
Removethe screws which secure the rear
cover.
Pry up the rear cover with a screw-
driver and remove
it.
Use a screwdriver to remove the brush
holder caps. Take out the worn carbon
brushes, insert the new ones and secure
thebrush holdercaps.
Insulating lip
Commutator
screws
I
10

Lubrication
This tool requiresno hourly or daily lubrica-
tion because
it has a grease-packedlubrica-
tion system. It should be relubricated after
every
6 months of operation. Send the
complete tool to Makita Authorized or
Factory Service Center for this lubrication
service. However, if circumstances require
that
you should lubricateit by yourself, pro-
ceed
as follows.
Run the tool for several minutesto warm it
up. Switchoff and unplugthetool.
Loosen the six screws and remove the
handle.
Remove the crank cap using
a socket
wrench. Restthe tool on the table with the
bitendpointingupwards.Thiswill allowthe
old grease to collect insidethe crank hous-
ing.
Wipe out the old grease inside and replace
with
a fresh grease (30 9).Useonly Makita
genuine hammer grease (optional acces-
sory). Filling with more than the specified
amount of grease (approx.
30 g) can cause
faulty hammering action
or tool failure. Fill
only with the specified amount of grease.
Reinstallthe crank cap andtightenwith the
socket wrench.
CAUTION:
Screws
*
Socket wrench
I Hammerarease
Be careful notto damage the terminal or leadwires especially when wiping out the old
Do nottightenthe crank cap excessively. It is made of resinand is subjecttobreakage.
greaseof installingthe handle.
To maintain product SAFETY and RELIABILITY, repairs, any other maintenance
or adjust-
mentshouldbeperformedby MakitaAuthorizedor FactoryService Centers, always using
Makita replacementparts.
11

CAUTION:
These accessories or attachments are recommendedfor use with your Makita
tool specified in this
manual. The use
of any other accessoriesor attachments might present a risk of injury to persons.
The accessories or attachmentsshould
be usedonly inthe proper and intendedmanner.
*Bullpoint (Fordemolishing)
*Cold chid (Forgouging)
300 mm (11-7/8") Part No. 798146-1
450
mm (17-3/8") Part No. 798147-9 Part No. 7981398
- Part No. 79814G3
26
mm (1 '7 x 300 mm (11-7/8")
26
mm (1 ") x 450 mm (17-3/4")
Scalingchid
50 mm (2") x 300 mm (11-7/8")
Part No. 798141-1
-
*Groovingchisel
22 mm (7/8") x 300 mm (11-71 8")
26 mm (1 ") x 300 mm (11-7/8")
PartNo. 798142-9
Part No. 798143-7
*Bushingtool (For surfacingconcrete)
67
mm (2-5/8") x 300 mm (11-7/8")
PartNo. 798144-5
*Bit grease 100g; 3.5 oz.
Part No. 181573-3
Es3
safety goggle
Part No. 191686-2
Clay spade
105 mm (4-118") x 400 mm (153/4")
Part No. 798148-7
Rammer (Fortamping, ramming, etc.)
140
mm (51/2") Part No. 7981495
Hammergrease (309)
Part No 18149G7
Plastic carryingcase
12

Dec.-08-'99 US
DEMOLITION HAMMER
Model HM1242C
Note: The switch and other part configurations
may differ from country to country.
13

MODEL HM1242C
'i;M A$& DESCRIPTION ITEM NO.
NO. USED
MACHINE
1
2
3
4
6
8
10
11
12
13
14
15
18
17
18
19
20
21
22
23
24
26
28
27
28
29
30
31
32
33
34
36
36
37
39
40
41
42
43
44
46
48
47
48
38
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
4
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
-
Tool Holder cap
Ring Spring
29
Pi" 6
Roller Guide
Tool Holder Cover
Cup Washer 46
ComprassionSpring 66
Steel Ball Guide
Ring Spring
34
Flat Washer 37
Chanps Ring
Ring Spring
46
Housing Cover
Hex. Bolt M8x150
Side Handle
Wing Nu1
M8
Spring Pin 5-24
Side Handle Cam
Side Handle Bass 82A
Side Handle Bass 828
Si& Handle Cam
0 Ring 58
8Wd
Stwl 0aIi 6.6
Hex. Socket Head Bolt Max30
0 Ring 07
0 Ring 38
Urethane Ring 43
Tool Holder
Roller 12
Fluoride Ring 28
0 Ring 23
Impact Boll
Impact
Bolt Guide
Rubber Ring 26
Collared Sleeve 24
Guide Ring
Flat Washer 49
Cylinder Liner 44
Slide Sleeve 49
Ring 49
0 Ring 38
CompressionSpring 60
Crank Cap
0 Ring 90
MACHINE
49
60
61
62
63
64
56
66
67
68
69
60
61
82
63
84
86
86
67
68
69
70
71
72
73
74
76
76
77
78
79
80
81
82
83
84
86
86
87
88
89
90
91
92
_.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
4
2
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
2
2
4
1
1
2
1
2
1
1
1
-
Dec.-08--'99 US
DESCRIPTION
Striker
0 Ring 34
0 Ring 34
0 Ring 36
Sleeve 9
PIStO"
Rod
Crank Shaft
bll Bearing 6304LLU
Naadls Bearing 1212
Crank Housing
Controliar cover
Handle
Hex. Socket Head Boll M8x40
Hax. Smbt Head Bolt Max30
Hex. Socket Head Bolt M8x30
Acrylic Pin 6
Switch Laver
8all baring 8202DDW
Oil sea1 17
ARMATUREASSEMBLY
IWith
Item 71, 72 k 921
Insulation Washer
bll baring 8000DDW
Baffle Plate
Tapping
Screw 6x66
FIELD ASSEMBLY
Motor Housing Complete
Name
Plate
Rubber Pm 4
Makita Mark
Switch
controiisr
A.C. Carbon Brush
BrushHolder Cap
Hex. Socket Head Bolt M6x40
Fix Rod
StrdPRaliaf
Rear Cover
Tapping
Screw 4x18
Cord Guard 10
Card
Fan
80
stopper
TWAW screw dXia
Note:
The swilch and other parl specifications may differ from country 10 counlry
14

MAKITA LIMITED ONE YEAR WARRANTY
Warranty Policy
Every Makita tool is thorou ly inspected and tested before leaving the factory. It is warranted to
be free of defects from workanshipand materials for the peripd of ONE YEAR from the date of
original purchase. Should any trouble develop during this one-year period, return the COMPLETE
tool, freight prepaid, to one
of Makita’s Factory or Authorized Service Centers. If inspection shows
the trouble is caused by defective workmanship or material, Makita
will repair (or at our option,
replace)without charge.
ThisWarrantydoes not apply where:
repairshave been made or attempted by others:
repairsare required because of normal wear and tear:
Thetool has been abused, misused or improperly maintained ;
alterations have been made tothe tool.
IN NO EVENT SHALL MAKITA BE LIABLE FOR ANY INDIRECT, INCIDENTAL
OR CON-
SEQUENTIAL DAMAGES FROM THE SALE OR USE OFTHE PRODUCT. THIS DISCLAIMER
APPLIESBOTH DURING AND AFTER THE TERM OF
THIS WARRANTY.
MAKITA DISCLAIMS LIABILITY FOR ANY IMPLIED WARRANTIES, INCLUDING IMPLIED
WARRANTIES OF “MERCHANTABILITY” AND “FITNESS FOR A SPECIFIC PURPOSE.”
AFTER THEONE-YEARTERM OF
THIS WARRANTY.
This Warranty gives you specificlegal rights, and you may also have other ri&ts which vary from
state to state. Some states do not allow the exclusionor limitation
of incidental or consequential
damages, so the above limitation or exclusion may not apply to you. Some states do not allow
limitation on
how long an implied warranty lasts, so the above limitation may not apply to you.
Makita Corporation
3-11 -8, Sumiyoshi-cho,
Anjo, Aichi 446-8502 Japan
884290- 063 PRINTED IN JAPAN
1999 - 12 - N