Makita HM1242C Handbuch

Continuous Rating (W)

Voltage (V) Cycle (Hz) Input Output Max. Output(W)

100

115

220

230

240

Models No.

Description

PRODUCT

Current (A)

TECHNICAL INFORMATION

CONCEPTION AND MAIN APPLICATIONS

Specification

Standard equipment

Optional accessories

< Note > The standard equipment for the tool shown may be differ from country to country.

P 1/ 12

HM1242C

Demolition Hammer

112mm(4-3/8")

258mm(10-1/8")

572mm(22-1/2")

HM1242C is the 10 Kg class hammer for BOSCH shank type

hammer bits (3/4" Hex 21/32 Round shank)

This model is taking over the existing HM1202C's benefits

in incredibly low noise, compact body and the strongest

demolishing power in this class.

120 13

7.3

7.0

6.7

50 / 60

1,450

500

550

1,600

1,800

Bit-type

950-1,900 (bpm)

Blows per minute

Net Weight 9.3kg (20.5 lbs)

Cord Length 5m (16.4 ft)

Size of shank

BOSCH shank type

hammer bits

(3/4" Hex 21/32 Round shank)

Grease for bit ........... 1 pc.

Bull point 19-300

Bull point 19-450

Cold chisel 26-300

Cold chisel 26-450

Scaling chisel 50-300

Grooving chisel 22-300

Grooving chisel 26-300

Clay spade 105-400

Rammer 140

Bushing tool 67-300

<1> Removing armature

(1) Take off the rear cover from the motor housing

by loosening 2 pcs.of tapping screw M4x18.

And then take off the carbon brushes after

taking off the brush holder cap.

(2) Take off the handle and controler cover

by loosening 2 pcs.of hex socket hd.bolt M6x40

and 4 pcs.of hex socket hd.bolt M6x30.

(3) Dismount the motor housing by loosening

4 pcs.of hex socket hd.bolt M6x40.

(4) Support the machine with the repairing jig No.1R023,

1R218 and 1R022.

Put a round stick (repairing jig No.1R234 or 1R235)

on the armature

The armature can be removed from the

motor housing by pushing the above round stick

with arbor press.

Screwdriver

Brush Holder Cap

Tapping screw M4x18

Hex socket hd.bolt M6x40

Hex socket hd.bolt M6x30

Controler cover

Hex socket hd.bolt M6x40

Motor housing

Base of arbor press Armature

1R022

1R023

1R218

1R234 or

1R235

Arbor press

P 2/ 12

Repair

Fig.1

Fig.2

Fig.3

Fig.4

(5) Removing ball bearing 6304LLU from crank shaft.

Insert the repairing jig 1R234, 1R240 and 1R241 into the arbor on the crank shaft as per

the following illustration. And then, press with arbor press. So, Ball bearing 6304LLU can be removed.

Arbor press

Crank shaft

Base of arbor press

Ball bearing 6304LLU

1R234 1R240

1R241

1R032 - 1R037

1R034

(Mounting)

Make sure that the gears engage each other, before pressing the armature

with arbor press into crank housing.

<2> Repairing on chuck section

Repairing on chuck section has to be made

with installing controller cover, because it is difficult

to keep the machine standing without it.

(Dismounting)

(1) Pull tool holder cover down in the direction

of the motor housing.

Dismount tool holder cap.

Arbor press

Tool holder cap

Tool holder cover

P 3/ 12

Repair

Fig.5

Fig.6

Fig.7

Repair P 4/ 12

(2) Pulling tool holder cover down

in the direction of the motor housing,

slide the cut of ring spring 29 in the

direction of the cut of tool holder cover.

And expand the cut of ring spring 29 with,

repairing tool No.1R212, lifting it with

driver as illustrated in Fig.8.

(3) Tool holder, roller guide and pin 6 can be

removed as a set, with removing

ring spring 29.

Roller guide can be removed from tool

holder cover, with taking off pin 6.

Fig.9

Fig.8

No.1R212 Cut of tool

holder cover

Ring spring 29

Tool holder cover

Pin 6

Roller guide

Tool holder cover

<3> Repairing of piston and striker

Take off only handle, not remove controller cover.

(Dismounting)

(1) Take off change ring after removing

chuck section.

And then, take off ring spring 46

with pawl for retaining ring .

Dismount housing cover.

Ring spring 46

Housing cover

No.1R212

Pawl for retaining ring

Fig.10

(2) Loosen 4 pcs. of hex socket head bolt M8x30.

Then barrel can be removed together with

tool holder. Hex socket head bolt M8x30

(4 pcs.)

Barrel

Fig.11

Repair P 5/ 12

(3) Hold cylinder liner 44 with hand and

strike crank housing with plastic or

wooden hammer.

Then the cylinder liner 44 can be

removed from the machine.

Cylinder liner 44

Crank housing

Fig.12

(Assembling)

(1) Assemble slide sleeve 49, ring 49 and

compression spring 50 to cylinder liner 44.

And then, put the cylinder liner 44 on piston.

Mount the cylinder liner to the crank housing

by pressing it with hand.

Insert striker into the cylinder liner from

the bit-installing side.

Compression spring 50

Striker

Ring 49

Slider sleeve 49

Cylinder liner 44

Crank housing

Piston

Fig.13

(2) Adjust the convex of tool holder cap

to the concave of tool holder cover.

Make sure that tool holder cap does

not turn after assembling. Tool holder cap

Tool holder cover

Tool holder

Adjust the convex of tool holder cap

to the concave of tool holder cover.

Fig.14

<4> Repairing of tool holder

Take off only handle, not remove controller cover.

(Dismounting)

Take off flat washer 37 after removing

ring spring 34.

Remove tool holder from barrel by pressing .

Tool holder

Ring spring 34

Barrel

Flat washer 37

Repair P 6/ 12

(Assembling)

(1) Assemble tool holder to barrel after

inserting impact bolt as illustrated in Fig.16.

( Note )

Make sure, that urethane ring 43 and O ring 38

are assembled to tool holder in advance.

( Note )

The mark, " UP " has to be faced to the bit

installing side as illustrated in Fig.17A.

Barrel O ring 38

Urethane ring 43

Impact bolt

Tool holder

Barrel

Tool holder

Ring spring 34

Flat washer 37

Fig.16

Fig.17

(2) Assemble flat washer 37 to tool holder

after assembling tool holder to barrel.

And then, fix flat washer 37 with

ring spring 34.

Bit installing side UP

Fig.17A

< 5> Assembling fluoride ring

(Assembling)

(1) Fluoride ring 28, just after assembled, can not be fit

precisely along the groove on the impact bolt.

The edge come out from the groove.

(2) Insert the impact bolt on which the fluoride

ring 28 is attached, into repairing jig No.1R-214.

At this time the impact bolt has to be inserted

from the hole for [HR5001C]

And then, keep the impact bolt in the repairing jig

approx. 10 sec for correction of fluoride ring 28.

(3) Pay attention, not to damage fluoride ring 28, when

the impact bolt is inserted into tool holder.

Fluoride ring 28 of which edge has come out

from the groove.

O ring 23 O ring 23

Fluoride ring 28 corrected

with repairing jig No.1R-214

HR4000C

HR5001C

Repairing jig No.1R-214

(Taper sleeve)

Hole for

[HR5001C]

Fig.18

Repair P 7/ 12

< 6> Mounting of barrel

Take off only handle, not remove controller cover.

(1) Set the of the guide ring on the of flat washer 49.

Mount the above guide ring and flat washer 49 on the 3 prongs

of slide sleeve 49.

(2) Set collared ring 24 ,rubber ring 25 and impact bolt guide

on the 3 prongs of slide sleeve 49.

(3) Set barrel (with tool holder) on the cylinder liner 44 gently paying attention

to keep collared ring 24, rubber ring 25 and impact bolt guide on the slide sleeve's edge.

Assemble compression spring 50 to crank housing by pressing it.

< Remarks>

Pay attention to the position of flat part on barrel as per the following illustration.

Tool holder

Barrel

Impact bold guide

Rubber ring 25 Guide ring

Flat washer 49

Slide sleeve 49

Compression spring 50

Crank housing

Cylinder liner 44

Flat part on barrel

has to face in the direction

of top and bottom.

Collared ring 24

< 7> Mounting of controller cover

Set switch trigger in of switch lever.

Fig.19

Fig.20

Repair P 8/ 12

< 8> Grease

Change of grease

Change grease to fresh one when carbon brush is changed.

(1) Idle the machine for several minutes in order to warm up.

(2) Take off the handle and controller cover

by loosening 2 pcs.of hex socket hd.bolt M6x40

and 4 pcs.of hex socket hd.bolt M6x30.

And then, crank housing appears.

Hex socket hd.bolt M6x40

Hex socket hd.bolt M6x30

Handle

Crank Housing

Crank Cap

Controller cover

< Remarks >

The fresh grease to be applied has to

be limited to 30 g.

Over application can be cause of trouble.

(3) Take off crank cap.

(4) Gather the grease softened by warming up, into

the crank housing by facing the tool holder cap side

to upward.

(5) Wipe up the grease

in the crank housing

with cloth. And then, apply fresh MAKITA grease

No.00 by 30g.

Fig.21

Fig.22

Repair P 9/ 12

* The parts to be greased with MAKITA grease No.OO.

Put grease on the following parts in order to protect parts and machine from unusual abrasion

and overheating.

O ring23

Fluoride ring 28 Impact bolt Striker O ring34

O ring34 Piston Holes of Piston

Cylinder liner 44: Surface marked with

Slide sleeve 49 Ring 49

Cylinder

liner 44

Impact bolt guide Collard sleeve

Rubber ring 25

Barrel : Inner part marked with and .

Gear part of Crank shaft

Tool holder and its holes

for roller 23 and steel ball 5.6.

* The parts to be greased with MAKITA grease No.2.

Put grease on the following parts in order to protect parts and machine from unusual abrasion

and overheating.

Repair P 10/ 12

< 9 > Maintenance

It is recommended to change carbon brush every 140 hours operation. When changing carbon brush,

we recommend you to change the following parts together.

* Grease in crank housing.

Apply fresh grease approx. by 30g. ( See P 10 / 14. )

30 Urethane ring 43

O ring 34

Roller 12 O ring 23

Fluoride ring 28

* Urethane ring 43 and roller 12 to be assembled to (32) tool holder

* Fluoride ring 28 and O ring 23 to be assembled to (36) impact bolt

* Rubber ring 25 to be assembled to cylinder liner 44 unit ( 42: cylinder liner 44 and 43:slide sleeve)

* O ring 34 to be assembled to (49) striker

Rubber ring 25

39 40

* O ring 34 to be assembled to (54) piston

* O ring 36 to be assembled to (54) piston

O ring 34

O ring 36

Fig.23

Fig.24

Fig.25

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