Makita HM1304 Manual

Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Max. Output(W)
110 900
900
900
900
900
14.0 1,500
1,500
1,500
1,500
1,600
1,600
1,600
1,600
1,600
1,600
120 13.0
7.2
6.9
6.6
220
230
240
Models No.
Description
PRODUCT
Current (A)
HM1304B
HM1304B is the sister model of HM1304, and hex 28.6mm
(1-1/8") bit can be used with HM1304B.
And this new product conforms to requirements of
the new European noise regulation which will be effective
from 2006.
Demolition Hammer
TECHNICAL INFORMATION
CONCEPTION AND MAIN APPLICATIONS
Specification
Standard equipment
Optional accessories
< Note > The standard equipment for the tool shown may differ from country to country.
P 1 / 12
Dimensions : mm ( " )
Width ( W )
Height ( H )
Length ( L )
50 / 60
50 / 60
50 / 60
50 / 60
50 / 60
L
H
831 (32-3/4)
219 (8-5/8)
115 (4-1/2)
w
by double insulation
1,450
27.5
17.0 (37.5)
5.0 (16.4)
28.6 (1-1/8) hex
* Steel carrying case ............................ 1 pc.
* Bull point
* Cold chisel * Scaling chisel * Clay spade * Rammer
Blows per min, :(bpm=min -1)
Protection from electric shock
Net weight :Kg (lbs )
Cord length : m ( ft )
Single blow energy : J
Shank : mm (")

Repair P 2 / 12
< 1 > Lubrication
Apply the grease a mentioned in the below list to protect parts and product from unusual abrasion.
Tool guide
Gear housing
Striker
Impact
bolt
Piston
Connecting
rod
7
1
9
12 13
15
26 25
22
19
64
47
90
78
76
Parts The portion to be lubricated The grease to be applied
MAKITA grease R No.00
The amount
to be applied: g (oz.)
Item
No.
1 Tool holder Inside where contacts hammer bit. 0.5 (0.02)
MAKITA grease R No.00
7 O Ring 24 0.5 (0.02)
MAKITA grease R No.00
9 Idler Inside where contacts impact bolt.
Inside where piston and striker
reciprocate
0.5 (0.02)
MAKITA grease R No.0012 / 13 O Rings 61 0.5 (0.02)
MAKITA grease R No.0015 X Ring 30 0.5 (0.02)
MAKITA grease R No.0022 O Ring 44 0.5 (0.02)
MAKITA grease R No.0019 O Ring 47 0.5 (0.02)
MAKITA grease R No.0025 Cylinder liner 5.0 (0.18)
Outside where contacts connecting
rod's hole. MAKITA grease R No.00
MAKITA grease R No.00
47 Needle
bearing 1715
The side where helical gear 57 and
helical gear 34 are mounted.
The portion where marked with
black arrow.
MAKITA grease N No.176 Gear housing
cover
0.5 (0.02)
30.0 (1.06)
MAKITA grease N No.1
78 Helical gear 57 30.0 (1.06)
64 Crank housing 60.0 (2.12)
MAKITA grease N No.190 Helical gear 34 30.0 (1.06)
MAKITA grease R No.00
26 O Ring 44 1.0 (0.05)
Seal holder
Crank shaft

Repair P 3 / 12
< 2 > Disassembling motor section
(1) Remove holder cap plate by unscrewing pan had screw M5x16. Remove rubber ring 6, brush holder cap
and carbon brushes. See Fig. 2.
(2) Remove handle set from crank housing by unscrewing hex socket head bolts M6x50 and M6x40.
However, the handle set can not be separated completely from motor housing in this step,
because it is still connected with lead wires. See Fig. 3.
(3) Unscrew hex socket head bolt M6x50. See Fig. 4.
(4) Strike crank housing as illustrated in Fig. 5. Then, motor housing can be separated from crank housing See Fig. 5.
(5) Strike crank housing as illustrated in Fig. 6. Then, Armature and baffle plate can be separated from crank housing
See Fig. 6.
Pan head
screws M5x16
Holder cap plate
Rubber ring 6
Brush holder cap
Carbon brush Rear cover
Hex socket head
bolts M5x18
Hex socket head
bolts M6x50
Hex socket head
bolts M6x40
Hex socket head
bolts M6x50
Fig. 2 Fig. 3
Fig. 4 Fig. 5
Fig. 6
Lead wires
Plastic hammer
Crank
housing
Baffle plate

Repair P 4 / 12
< 3 > Assembling motor section
Hex socket head
bolts M6x50
Fig. 8
Fig. 7 Hex socket head
bolts M6x40
Hex socket head
bolts M6x50
Fig. 9
Lead wires
Handle set
Pan head
screws M5x16
Holder cap plate
Rubber ring 6
Brush holder cap
Carbon brush Rear cover
Hex socket head
bolts M5x18
Fig. 10
(1) Make sure that seal has been previously mounted to armature. Mount armature and then baffle plate to
crank housing. See Fig. 7.
(2) Make sure that flat washer 18 has been previously mounted in the bearing assembling hole of motor housing
(rear cover side). Mount motor housing to crank housing by pressing. Fasten it with hex socket head bolts
M6x50. See Fig. 8.
(3) Mount handle set. Fasten it with hex socket head bolts M6x50 and hex socket head bolts M6x40. See Fig. 9.
Be careful, not to pinch lead wires with handle set in this step.
Crank
housing Motor
housing
Armature
Baffle plate
(4) Mount rear cover and fasten it with hex socket head bolts M5x18. Mount carbon brushes and fasten it with
brush holder cap, rubber ring 6 and holder cap plate. See Fig. 10.
Flat washer 18
Seal

Repair P 5 / 12
< 4 > Removing barrel section from crank housing
(1) Take off hex socket head bolts M6x45 and insert slotted head screwdriver into the gap between gear housing cover
and gear housing. Lever up gear housing cover with the inserted screwdriver. Then, gear housing cover can be
separated from gear housing See Fig. 11.
(2) Remove crank cap from crank housing. Then, you can see hex socket head bolt M6x18 with which connecting rod
and crank shaft are connected. See Fig. 12.
(3) Take off hex socket head bolt M6x16, flat washer 6 and needle bearing 1715. Then, gear housing (including helical
gear 57, helical gear 34, crank shaft armature etc,) can be separated from crank housing. See Fig. 13.
(4) Take off hex socket head bolts M10x40. And then, separate barrel from crank housing. See Fig. 14.
Fig. 11
Fig. 12
Fig. 13
Fig. 14
Hex socket head
bolts M6x45
Crank cap
Hex socket
head bolt M6x18
Crank housing
Crank housing
Needle bearing 1715
Flat washer 6
Hex socket
head bolt M6x18
Hex socket
head bolts M10x40
Be careful, not to lose pins 6.

Repair P 6 / 12
Fig. 15
Fig. 16
Fig. 17
(1) Take off hex socket head bolts M8x30 and remove tool holder from barrel. And take off inner parts from barrel.
See Fig.15.
(2) Put 1R032 "Bearing setting plate" into barrel. And remove cylinder liner from barrel by pressing the 1R032 put into
barrel with arbor press. See Fig.16.
Hex socket
head bolts M8x30
Adhesive is applied
to hex socket head
bolts M8x30
Tool holder
Barrel
< 5 > Removing cylinder liner from barrel
(1) Put No.1R201"Jig for Retainer Ring" on retainer ring, and pass No.1R282"Round Bar for Atbor" through the screw
hole for hex socket head bolt M8x30. Press the round bar for arbor with arbor press, so retainer ring is pressed sown.
And pin 4 can be removed. See Fig. 17. Retainer rings and compression springs 4 can be removed.
< 6 > Disassembling tool retainer section
1R218
Adjuster sleeves
Cylinder liner
Urethane ring 48 (2 pcs.)
Urethane ring 48 (2 pcs.)
Rubber ring 52
Seal holder
Tool guide
Flat washer 48
1R032
Bearing setting plate
Pin 4
Rounfr bar
for arbor
Retainer ring
Retainer rings
1R201
Jig for Retainer
Ring
Compression
spring 4
Compression
spring 4

Repair P 7 / 12
(2) Take off spring pins 8-40 by striking with hammer as illustrated in Fig. 18. Then, tool retainer section can be
disassembled as illustrated in Fig. 18A.
(1) Mount tool retainer poles to tool holder. And mount tool retainer. Mount retainer shaft by passing through
tool retrainer and tool retainer poles. See Fig. 19.
(2) Mount spring pin 8-40 as illustrated in Fig. 20. Mount compression springs 4 and retainer rings to tool retainer pole
as illustrated in Fig. 21. Put the jig for retainer ring on retainer ring and pressing the jig with arbor press,
mount pin 4. See Fig. 22.
(3) Mount tool retainer section to barrel as illustrated in Fig. 23.
< 7 > Assembling tool retainer section
Fig. 18
Fig. 19
Fig. 20 Fig. 21 Fig. 22
Fig. 23
Spring pin
extractor
Spring pins 8-40
Tool retainer pole
Tool retainer
Tool holder
Tool retainer
shaft
Tool retainer
pole Fig. 18A
Tool retainer poles Tool retainer
Tool retainer shaft
The cut portion has to
be faced to the bow portion
side of tool retainer.
Bow portion of
tool retainer
Cut portion of tool retainer shaft
Front view of tool retainer section
Tool holder
Spring pin
extractor
Spring pins 8-40
Pin 4
Round bar
for arbor
Retainer ring
1R201
Jig for Retainer Ring
Retainer rings
Compression
spring 4
Compression
spring 4
Tool retainer poles
Hex socket
head bolts M8x30
<Note> The adhesive has been applied to
hex socket head bolt M8x30.
They have to be always replaced
with the fresh one.
Tool holder Barrel

Repair P 8 / 12
< 8 > Assembling barrel section to crank housing
(1) Mount cylinder liner into barrel with arbor press. See Fig.24. And mount the parts to barrel as illustrated in Fig. 25.
(2) Mount tool holder and insert piston with connecting rod into barrel as illustrated in Fig 26.
Urethane ring 48
Rubber ring 52
Seal holder
Tool guide
Idler
Flat washer 48
1R032
Bearing setting plate
Cylinder liner
Barrel
Tool holder Barrel
O ring 44
O ring 47
O ring 44
Make sure that O ring 44, and
O ring 47 (for holding pin 12) have
been previously mounted to piston.
Make sure that O ring 67 has
been previously mounted to
crank housing.
Piston
Connecting rod
Needle bearing 1715
Flat washer 6
Hex socket
head bolt M6x18
Make sure that these pins 6. have been
previously mounted to the illustrated
positions respectively.
Hex socket
head bolts M10x40
(4 pcs.)
O ring 67
(3) Mount barrel as illustrated in Fig. 27.
Jointing connecting rod with crank shaft which
functions also as a shaft of helical gear 57,
mount gear housing section to crank housing.
Mount needle bearing 1715 and flat washer 6,
and fasten them with hex socket head bolt M6x18
for securing the joint of connecting rod and crank shaft.
See Fig. 28.
Crank shaft
Helical gear 57
Crank housing
Connecting rod
Connecting rod
Fig. 24
Fig. 25
Fig. 26
Fig. 27
Fig. 28
Hex socket
head bolts M8x30
Tool holder

Repair P 9 /12
< 9 > Disassembling gear housing section
(1) Remove ball bearing 6302 from crank shaft with 1R044 "Small gear extractor". See Fig. 29.
(2) Holding bearing box mounted to gear housing, with 2 pcs. of round bars for arbor (approx. Ø30mm)
press the crank shaft and remove it from gear housing. See Fig. 30.
Be careful, not to lose woodruff key 4 in this step.
(3) Then, helical gear 57 and ring 25 can be separated from gear housing. See Fig.31.
Remove bearing box by unscrewing hex socket head bolts M6x22. Then, ball bearing 6205LLU can be separated
from gear housing. See Fig.32.
Crank shaft
Ball bearing
6302
1R044
Small gear extractor
Woodruff
Key 4
Crank shaft
Bearing box
Helical gear 57
Helical gear 57
Gear housing
Gear
housing
Gear
housing
2 x Round bar for arbor
with Ø30mm
Helical gear 57
Ring 25
Hex socket bolts
M6x22
Ball bearing
6205LLU
Bearing box
< 10 > Assembling gear housing section
(1) Mount ball bearing 6205LLU to bearing box. Fasten the bearing box with 4 pcs. of hex socket
head bolts M6x22. See Fig. 33.
(2) Mount crank shaft by pressing through ball bearing 6205LLU with arbor press. See Fig. 34.
(3) Mount ring 25 through crank shaft and insert woodruff key 4 into the groove of crank shaft. See Fig. 35.
Hex socket bolts
M6x22
Crank shaft
Crank shaft
Bearing box
Gear housing
Ring 25 Woodruff key 4
Ball bearing
6205LLU
Bearing box
< Note > It is recommended to put grease into the groove of crank shaft to prevent woodruff key 4 from falling off
crank shaft at the mounting of helical gear 57.
Fig. 29
Fig. 30
Fig. 31 Fig. 32
Fig. 33
Fig. 34 Fig. 35

Repair P 10 / 12
< 11 > O ring and X ring
(1) Apply the grease to O rings and X ring for securing the function of grease pack system. The dust which can damage
the O ring, X ring and cylinder, has to be taken off.
(2) When inserting impact bolt into seal holder, be careful, not to damage the rip of X ring 30. See Fig. 39.
X ring 30
Impact bolt
(4) Aligning the cut portion of helical gear 57 with the woodruff key 4, mount helical gear 57 to crank shaft
by pressing crank shaft with arbor press. See Fig. 36.
(5) Mount ball bearing 6302 to crank shaft by pressing crank shaft with arbor press. See Fig. 37.
(6) Assemble helical gear 34 to which ball bearings 6001 and 6201 have been previously mounted, to gear housing.
See Fig. 38.
Woodruff key 4
Groove of
helical gear 57
Helical gear 57
Ball bearing 6302
Ball bearing 6201
Helical gear 34
Ball bearing 6001
< 12 > Assembling idler
Mount idler facing its large hole side to impact bolt as illustrated in Fig. 40A instead of Fig. 40B.
Fig. 40A
Fig. 40B
Rubber
ring 52
Tool holder
side
Impact bolt
side
Idler Impact bolt
Rubber
ring 52
Tool holder
side Impact bolt
side
Idler Impact bolt
The wrong installing of idler interferes
with the blow action, which is the cause
of the breakage of machine itself.
Fig. 36 Fig. 37
Fig. 38
Fig. 39

Repair P 11 / 12
< 13 > Fastening torque for bolts and screws
When assembling, fasten the bolts and screws with the following fastening torque.
< 14 > it is recommended to replace the following parts with the fresh ones, when you replace the carbon brushes
normally worn out. See Fig. 42.
Fig. 41
Fig. 42
3
30
75
30
86
53
61
105
86
The parts in
crank housing
Bearing box
Crank shaft
Needle bearing
1715
49
44
3
30
49
53
61
86
75
44
105
Hex socket head bolt M8x30 6 pcs.
Hex socket head bolt M10x40 4 pcs.
Hex socket head bolt M6x22 4 pcs.
Hex socket head bolt M6x50 4 pcs.
Hex socket head bolt M6x45 4 pcs.
Hex socket head bolt M6x50 2 pcs.
Hex socket head bolt M6x40 2 pcs.
Hex socket head bolt M6x18 1 pc.
Crank cap 1 pc.
29 - 39 N.m (300 - 400kgf.cm)
49 - 59 N.m (500 - 600kgf.cm)
13 - 16 N.m (130 - 160kgf.cm)
13 - 16 N.m (130 - 160kgf.cm)
13 - 16 N.m (130 - 160kgf.cm)
10 - 15 N.m (100 - 150kgf.cm)
3.9 - 5.9 N.m (40 - 60kgf.cm)
3.9 - 5.9 N.m (40 - 60kgf.cm)
3.9 - 5.9 N.m (40 - 60kgf.cm)
715
19
26 22
22
7O Ring 24 for tool guide
O Ring 44 for piston
O Ring 44 for striker
O Ring 47 for piston
X Ring 30 for seal holder
Tool guide
15
Seal holder
19
Piston
26
Striker

Circuit diagram P 12 / 12
Black
White
Orange
Purple
Color index of lead wires
1 2 3
4 5
Field
Receptacle
Receptacle
Switch
Power supply cord
Noise
suppressor
Wiring diagram
Handle side
Rear cover side
Lead wire
(orange)
Lead wire
(purple)
Inside of motor housing
Handle section
Connect receptacles to brush holders
so that the lead wires of orange and
purple face to the rear cover side
as illustration.
Motor housing
Do not slack the
lead wires in this
portion. Put 2 lead wires in every lead holder.
Noise suppressor
or sponge, which are
not used in some countries.