T
ECHNICAL INFORMATION
Models No.
HP1620, HP1620F, HP1621, HP1621F
Description
Hammer Drills 16mm (5/8")
PRODUCT
P 1 / 12
L
L
CONCEPT AND MAIN APPLICATIONS
The above products are up-grade version of the existing
models HP1500 and HP1501.
Their features are as follows.
Model No.
HP1620
F/R Change by
brush holder unit
LED Job Light
Keyless drill chuck
HP1620F
HP1621
W
HP1621F
HP1620
HP1620F
Cycle (Hz)
Current (A)
110
110 for Taiwan
120
220
230
240
6.2
5.4
5.7
3.1
3.0
2.9
Model No.
No load speed : (min -1= rpm)
Blows per min. : (min -1= bpm)
Keyless chuck
Chuck ability : mm ( " )
Concrete
Drilling
capacity : mm ( " ) Steel
Wood
F/R Change system
LED Job Light
Protection from electric shock
Cord length : m ( ft )
Net weight :Kg (lbs )
50 / 60
50 / 60
50 / 60
50 / 60
50 / 60
50 / 60
HP1620
No
No
Continuous Rating (W)
Input
Output
650
380
560
320
650
380
650
380
650
380
650
380
HP1620F
HP1621
0 - 2,800
0 - 44,800
No
Yes
1.5 - 13 (1/16 - 1/2)
16 (5/8)
13 (1/2)
30 (1-3/16)
Brush holder unit
Yes
No
Double insulation
2.0 (6.6)
1.7 (3.8)
HP1621F
Yes
Yes
Standard equipment
* Side handle .......................................
* Depth gauge ......................................
* Chuck key S-13.................................
* Plastic carrying case .........................
1 pc.
1pc.
1 pc. (only for HP1620 and HP1620F)
1 pc.
< Note > The standard equipment for the tool shown may differ from country to country.
Optional
HP1621
HP1621F
Dimensions : mm ( " )
Model No. HP1620(F)
HP1621(F)
Length ( L )
303 (11-7/8)
222 (8-3/4)
Height ( H )
Width ( W )
68 (2-11/16)
Specification
Voltage (V)
H
H
W
accessories
* T.C.T. Hammer drill bit ø16mm
* Metal drill bit ø13mm
* Drill bit for wood ø30mm
* Keyless drill chuck set
* Chuck key S-13 (only for HP1620 and HP1620F)
* Plastic carrying case
* Depth gauge
* Drill stand type 43
* Blow out bulb
* Drill chuck set
* Side handle set
Max. Output(W)
500
500
500
600
600
600
P 2 / 12
Repair
< 1 > Lubrication
Apply MAKITA grease N. No.1 to the following portions designated by black triangle to protect
parts and product from unusual abrasion.
Position
No.
9
13
17
Parts item
Spindle
Helical gear 45
Change lever
Amount : g
(oz)
Portion to be lubricated
The portion where ball bearing 6002LLB contacts,
when spindle reciprocates.
0.1 (0.01)
The portion where steel ball 5.0 contacts.
0.1 (0.01)
The teeth portion which engages armature gear.
The cam portion which contacts the those of cam
holder.
The whole portion with which steel ball 5.0 is
accepted.
6.0 (0.31)
17
Steel ball 5.0
13
9
Drill chuck
Ball bearing
6002DDW
Fig. 1
Cam holder
complete
Armature
1.7 (0.06)
0.1 (0.01)
P 3 / 12
Repair
< 2 > Removing drill chuck
Firmly hold No.1R139 "Drill chuck extractor" with vise. And lock spindle with the drill chuck extractor.
Holding No.1R298 "hex socket" with drill chuck, and turn the hex socket with No.1R223 "Torque wrench"
counter clockwise. So drill chuck can be disassembled from spindle. See Fig. 2.
(Removing keyless drill chuck with trouble)
If the drill bit sticks in keyless drill chuck, it can be difficult to turn the sleeve portion by hand for removing
the drill bit.
In this case, turn the hex nut with wrench 19 cluckwise vewing from bit side, while holding the sleeve portion
with pipe wrench firmly. So the drill bit can be removed from the keyless drill chuck.
See Fig. A.
Wrench 19
Retaining ring portion
Sleeve portion
Hex nut
Pipe wrench
Fig. A
< 3 > Mounting drill chuck
Firmly hold No.1R139 "Drill chuck extractor" with vise. And lock spindle with the drill chuck extractor.
Holding No.1R298 "hex socket" with drill chuck, and turn the hex socket with No.1R223 "Torque wrench"
clockwise. So drill chuck can be assembled to spindle. See Fig. 2.
<Note in assembling>
Pre-set the fastening torque of the torque wrench with 35.7 - 45.9 N.m (350 - 450kgf.cm), when assembling.
No.1R224 Ratchet head
No.1R298 Hex socket
No.1R223
Torque wrench
1R139 Drill chuck extractor
Fig. 2
P 4 / 12
Repair
< 4 > Disassembling housing R and L
( 1 ) Slide change lever to the drill mode. And pull off handle cover, while pushing a pin, inserted into
the pin hole of housing L. See Fig. 3.
( 2 ) Unscrew 7 pcs. of tapping screw 4x18. See Fig. 4. Now housing R can be separated from housing L.
Slide change lever
to the drill mode.
Tapping screw
4x18 ; 7 pcs.
Handle
cover
Insert a pin of which
diameter is smaller than 2.0mm,
into the pin hole of housing L,
and push it.
Fig. 3
Fig. 4
( 3 ) After removing housing R, take off carbon brushes as illustrated in Fig. 5.
Now the inner parts can be removed from housing.
Turn brush holder unit in a
direction of arrow.
Then, the carbon brush of
upper side can be removed.
For removing the carbon brush
of lower side, turn brush holder
unit in a direction of arrow.
Fig. 5
P 5 / 12
Repair
< 5 > Disassembling gear section (spindle, ball bearing 6002 LLB and helical gear 45)
( 1 ) Take off the inner parts from housing L, and remove gear section from cam holder complete as illustrated in Fig. 6.
( 2 ) Put the gear section on No.1R165 "Ring Spring Setting Tool" and press the spindle with arbor press. See Fig. 7.
Helical gear 45
of gear section
Housing L
Gear section
Fig. 6
Spindle
1R165 Ring spring
setting tool
Cam holder
complete
Fig. 7
Ball bearing
6002LLB
Compression
spring 15
( 3 ) Remove retaining ring S-15 from spindle. See Fig. 8.
( 4 ) Remove ball bearing 6002LLB with arbor press. See Fig. 9.
Be careful, not to lose compression spring 15 in this step.
No.1R291
Retaining ring
S and R pliers
Ball bearing
6002LLB
Retaining
ring S-15
Spindle
Ball bearing
6002LLB
Fig. 8
Compression
spring 15
Bearing setting plate
Fig. 9
Compression
spring 15
Spindle
< 6 > Assembling gear section
( 1 ) After mounting compression spring 15 to spindle, mount the spindle with compression spring 15, to
ball bearing 6002LLB by pressing with arbor press. See Fig. 10.
( 2 ) Mount retaining ring S-15 to the spindle for securing ball bearing 6002 LLB and compression spring 15.
See Fig. 11.
Spindle
Compression
spring 15
Retaining
ring S-15
Ball bearing
6002LLB
Fig. 10
Fig. 11
P 6 / 12
Repair
( 3 ) Mount the spindle to helical gear 45 as illustrated in Fig. 12R.
Ball bearing
6002LLB
Do not face the cam
portion to ball bearing
6002LLB side.
Otherwise, the cam of
helical gear 45 can not
engage with the cam
holder.
Ball bearing
6002LLB
Helical gear 45
1R165 Ring spring
setting tool
Fig. 12R
Fig. 12F
( 4 ) Mount the gear section to cam holder complete. And mount the inner parts to housing L as illustrated in Fig. 13.
( 5 ) Slide change lever to drill mode, and mount carbon brushes. See Fig. 14.
( 6 ) Secure housing R with 7 pcs. of tapping screw 4 x18. See Fig. 15.
( 7 ) Mount handle cover to the housing. See Fig. 16.
Cam holder
complete
Gear section
Slide to drill mode.
Turn brush holder unit in a
direction of arrow.
Then, the carbon brush of
upper side can be mounted.
Housing L
For mounting the carbon brush
of lower side, turn brush holder
unit in a direction of arrow.
Fig. 14
Fig. 13
Tapping screw
4x18 ; 7 pcs.
Handle
cover
Be careful, not to damage
hooks of handle cover, when
mounting it.
Fig. 15
Fig. 16
P 7 / 12
Repair
< 7 > Removing armature
( 1 ) After removing inner parts, separate gear section from cam holder complete. See Fig. 17.
( 2 ) Pull off change lever with steel ball 5.0 from cam holder complete. Remove plate 19. See Fig. 18.
( 3 ) Remove armature from cam holder complete as illustrated in Fig. 19.
( 4 ) Remove ball bearing 627DDW from cam holder complete as illustrated in Fig. 20.
Change lever
Steel ball 5.0
Cam holder
complete
Plate 19
Housing L
Cam holder
complete
Gear section
Fig. 17
Cam holder
complete
Armature
Fig. 18
Cam holder complete
1R045 Gear extractor
ø 8mm Round
bar for arbor
Fig. 19
Ball bearing
627DDW
Fig. 20
P 8 / 12
Repair
< 8 > Mounting armature
( 1 ) Hold cam holder complete as illustrated in Fig. 21.
< Note >
The cam portion has not to come on the supporter. Otherwise, it is impossible to hold
cam holder complete horizontally.
Cam holder complete
Cam portion
Something to hold
cam holder complete
Something to hold
cam older complete
Fig. 21
( 2 ) Mount armature assembly to cam holder complete by pressing with arbor press. See Fig. 22.
Fig. 22
( 3 ) Mount plate 19 to cam holder complete. After mounting steel ball 5.0 to change lever, push the change lever
into cam holder complete. See Fig. 23.
< Note >
Apply MAKITA grease N No.1 to
steel ball 5.0 before mounting it.
Steel ball 5.0
Plate 19
Cam holder complete with
armature
Cam holder complete
Fig. 23
P 9 / 12
Repair
( 4 ) Mount gear section to cam holder complete to which armature has been mounted. And mount them to housing L
together with field and brush older unit . See Fig. 24.
Cam holder
complete
Gear section
Fig. 24
( 5 ) Mount housing R in the order of Fig. 14, 15 and Fig. 16. See page 5.
< 9 > Removing field and brush holder unit
( 1 ) Disconnect 2 lead wires (black) from brush holder unit. And remove inner parts from housing L. See Fig. 25.
( 2 ) Remove armature, cam holder complete and gear section. See Fig. 26.
( 3 ) Pull off brush holder unit from field. See Fig. 26.
Brush holder
unit
Brush holder unit
Fig. 25
Field
Fig. 26
P 10 / 12
Repair
< 10 > Mounting field and brush holder unit
( 1 ) After connecting brush holder unit with field, mount them to housing L. And connect 2 lead wires
(black) of switch to brush holder unit as illustrated in See Fig. 27.
Fig. 27
Connect 2 lead
wires (black) of
switch to brush
holder unit.
Brush holder unit
Field
Brush holder
unit
Recess portion
Switch
Switch
Brush holder unit and field have to be so mounted
to housing L, that the recess portion of brush holder
unit has to be faced to switch.
( 2 ) Mount armature, cam holder complete and gear section by passing through field and brush holder unit. See Fig. 28.
Housing L
Fig. 28
( 3 ) Mount housing R in the order of Fig. 14, 15 and Fig. 16. See page 5.
Circuit
P 11 / 12
diagram
Model HP1620 and HP1621
without LED job light
Color index of lead wires' sheath
Black
White
Blue
Brown
Brush holder unit
M2
M1
Switch
1
a : Black lead wire can
be used for some country
instead of brown.
b : White lead wire can
be used for some country
instead of blue.
2
C1 C2
a
b
Noise
suppressor
Noise suppressor is not
used for some country.
Power supply cord
Wiring
diagram
Model HP1620 and HP1621
without LED job light
Brush holder unit
Do not put this field lead
wire on the rib.
Refer to Fig. 27
in page 10, when
mounting brush holder
unit.
Rib
Switch
Put noise suppressor
here, if it is used.
Circuit
P 12 / 12
diagram
Model HP1620F and HP1621F
with LED job light
Color index of lead wires' sheath
Black
White
Blue
Brown
Red
Brush holder unit
M2
M1
Switch
1
a : Black lead wire can
be used for some country
instead of brown.
b : White lead wire can
be used for some country
instead of blue.
2
C1 C2
Noise
suppressor
a
b
Light circuit
LED
Power supply cord
Wiring
diagram
Model HP1620F and HP1621F
with LED job light
Brush holder unit
Do not put this field lead
wire on the rib.
Refer to Fig. 27
in page 10, when
mounting brush holder
unit.
Rib
Switch
Circuit for LED
Put noise suppressor
here, if it is used.
LED