Makita MT80A Manual

PRODUCT
CONCEPT AND MAIN APPLICATIONS
P 1/ 12
Specification
Standard equipment
Optional accessories
Note: The standard equipment for the tool shown above may vary by country.
Model No.
Description
MT80A, MT80B
Hammer Drills 10mm (3/8"), 16mm (5/8")
Models MT80A/ MT80B have been developed as maktec brand
hammer drills 10mm (3/8")/ 16mm (5/8"), mainly for the emerging
countries.
New maktec design is employed to eliminate white printing and
polygonal line from maktec logo/ elastomer from handle for the cost
effectiveness.
Depth gauge
230
240
50/60
50/60
2.3
2.2
500
500
250
250
350
220 50/602.4 500 250 350
350
Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Max. Output (W)Current (A)
Dimensions: mm ( " )
Width (W)
Height (H)
Length (L) 262 (10-3/8)
MT80B
254 (10)
MT80A
196 (7-3/4)
70 (2-3/4)
Chuck capacity: mm (")
Chuck type
Reverse switch
Impacts per min.: min.ˉ¹= ipm
Capacities: mm (") Steel
Concrete
Wood
Protection against electric shock
Power supply cord: m (ft)
Weight according to
EPTA-Procedure 01/2003*: kg (lbs)
0 - 2,900
Model No. MT80B
0 - 43,500
Keyed
1.5 - 13 (1/16 - 1/2)
16 (5/8)
13 (1/2)
20 (13/16)
Yes
Double insulation
1.7 (3.7)
2.0 (6.6)
Variable speed control by trigger Yes
0 - 2,900
MT80A
0 - 43,500
Keyed
1.5 - 10 (1/16 - 3/8)
10 (3/8)
10 (3/8)
20 (13/16)
Yes
Double insulation
1.6 (3.4)
2.0 (6.6)
Yes
*with Side grip
Chuck key S10 (MT80A) ........................................ 1
Chuck key S13 (MT80B) ........................................ 1
Key holder 10 .......................................................... 1 (for some countries only)
Side grip .................................................................. 1
Plastic carrying case (MT80B) ............................... 1 (for “K model” only)
No load speed: min.ˉ¹=rpm
Specification
TECHNICAL INFORMATION
W
L
H

P 2/ 12
Repair
[1] NECESSARY REPAIRING TOOLS
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
Code No. Description Use for
1R004 Retaining ring pliers ST-2
Ratchet head 12.7 (for 1R223)
1/4” Hex. shank bit for M8
removing / mounting Ring spring 13
1R029
1R031
1R139
1R165
1R223
1R224
1R231
1R258
1R278
1R298
Bearing setting pipe 23-15.2 assembling Helical gear 39 to Spindle
Bearing setting pipe 28-20.2 assembling Cam complete to Cam holder
fixing Spindle when removing / mounting Drill chuck
holding Helical gear 39 when separating Spindle from Helical gear 39
holding Cam holder when disassembling/ assembling Cam complete
removing / assembling
Drill chucks
for both 10 mm and 13 mm Drill chucks
for 13 mm Drill chuck
for 10 mm Drill chuck
[2] LUBRICATION
Apply Makita grease N. No.2 to the following portions designated with the black triangle to protect parts and product
from unusual abrasion.
Fig. 1
Item No. Description
Spindle a little
a little
3.0g
1.7g
a little
a little
a: Drum portion for smooth hammering in the inner ring
of Ball bearing 6002LLB
b: Spindle end where 10 Steel ball 5 contacts
Steel ball 5
Change lever accepting hole for 10 Steel ball 5
Helical gear 39 c: Teeth portion for smooth engaging with Armature’s gear
d: Cam portion for smooth engaging with Cam on Cam holder complete
Whole portion
AmountPortion to lubricate
5
bc
d
a
5
9
9
10
10
Ball bearing 6002LLB
Compression spring 16
Ring spring 13
Armature
Cam holder
complete
12
12
Drill chuck extractor
Ring spring setting tool B
Torque wrench shaft 20-90N·m
Round bar for arbor 4-50
Hex bar 10 with square socket
V block
disassembling Cam complete from Cam holder

P 3/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1A. 13mm Drill Chuck of model MT80B
DISASSEMBLING
Remove 13mm Drill chuck as drawn in Fig. 2A.
Remove 10mm Drill chuck as drawn in Fig. 2B.
1. Fix 1R139 firmly with vise. Then attach 1R298 to
13mm Drill chuck, and then fix the machine to 1R139
by fitting the flat portion of Spindle to the groove of 1R139.
2. Attach 1R224 to 1R223 and set them to 1R298.
3. Turn 1R223 counter clockwise to remove
13mm Drill chuck from the machine.
1R139
1R298
1R224
1R223
Fig. 2A
Fig. 2B
[3] -1B. 10mm Drill Chuck of model MT80A
1R139
1R224
1R231
Bit adapter
1R223
1. Fix 1R139 firmly with vise. Then attach 1R231 and Bit adapter
to 10mm Drill chuck, and then fix the machine to 1R139
by fitting the flat portion of Spindle to the groove of 1R139.
2. Attach 1R224 to 1R223 and set them Bit adapter.
3. Turn 1R223 counter clockwise
to remove 10mm Drill chuck
from the machine.

P 4/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1A. 13mm Drill Chuck of model MT80B (cont.)
-1B. 10mm Drill Chuck of model MT80A (cont.)
ASSEMBLING
[3] -2. Helical Gear 39, Ball Bearing 6002LLB
DISASSEMBLING
Assemble by reversing the disassembly procedure. Refer to Fig. 2A or Fig. 2B.
Note: Set the fastening torque of 1R223 to 24.5N·m ~ 29.4 N·m (250 Kg f·cm ~ 300 Kg f·cm) and turn 1R223 clockwise.
(1) Remove Drill chuck as drawn in Fig. 2A or Fig. 2B.
(2) Remove Spindle section from the machine as illustrated in Fig. 3.
Fig. 3
3. Shift Change lever to Hammer
drill mode
1. Shift Change lever to Drill mode. 2. Remove Housing (R) by loosening seven 4x18 Tapping screws.
4. Hold Spindle and Change lever by hand, then Lift up Spindle
and Change lever while turning them counter clockwise
viewing them from Drill chuck side.
5. Pull off the Spindle section (Spindle, Ball bearing 6002LLB,
Compression spring 16) from Cam holder complete.
Change lever
Cam holder complete
Housing (R)
4x18 Tapping screw
(7 pcs.)
Change lever
Spindle Change
lever
Spindle section

P 5/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Helical Gear 39, Ball Bearing 6002LLB (cont.)
DISASSEMBLING
(3) Disassemble the removed Spindle section as drawn in Fig. 4.
ASSEMBLING
(1) Assemble Compression spring 16 and Ball bearing 6002LLB to Spindle. And secure them with Ring spring 13.
(Refer to the lower two illustrations in Fig. 4.)
Note: Apply a little amount of Makita grease N. No.2 to Drum portion of Spindle and in the inner ring the bearing.
(Refer to [2] LUBRICATION.)
(2) Assemble Helical gear 39 to Spindle as drawn in Fig. 5.
Fig. 4
3. Ball bearing 6002LLB and Compression spring 16 are secured to Spindle with Ring spring 13.
Remove Ring spring 13 with 1R004. Now, Ball bearing 6002LLB and Compression spring 16
are removed from Spindle.
1. Put the removed Spindle section onto
1R165 to support Helical gear 39.
2. Remove Helical gear 39 by pressing the Spindle end
with Arbor press.
Spindle
1R029
1R165 1R165
Helical gear 39
Spindle Helical gear 39
Spindle end
Ring spring 13 1R004
Ball bearing 6002LLB
Ball bearing
6002LLB
Cam portion
1. Set the Spindle section to 1R139. 2. Apply 1R029 to Helical gear 39, and press 1R029 with Arbor press
to assemble the gear to the Spindle section.
Note: Face the cam portion of Helical gear 39 to the opposite side
to Ball bearing 6002LLB
Compression spring 16
Fig. 5

P 6/ 12
Repair
[3] -3. Cam Complete, Change Lever
ASSEMBLING
DISASSEMBLING
(3) Mount the assembled Spindle section to the machine as drawn in Fig. 6.
Fig. 6
Fig. 7
1. Assemble the Spindle section to Cam holder complete. 2. Shift Change lever to Hammer drill mode.
Change lever
3. Hold Spindle and Change lever by hand, and put them
to housing (L) while turning them clockwise viewing
from Drill chuck side.
4. Shift Change lever to Drill mode.
And assemble Housing (R).
Cam holder complete
Spindle Change
lever
Spindle section
Housing (L)
(1) Shift Change lever to Drill mode, and separate Housing (R) from Housing (L) by unscrewing seven 4x18 Tapping
screws. (See the upper two illustrations in Fig. 3.)
(2) Shift Change lever back to Hammer drill mode, and remove the Spindle section from Cam holder complete.
(See the lower illustrations in Fig. 3.)
(3) Disassemble Cam holder complete as drawn in Fig. 7.
Cam holder
complete
Cam holder
complete
Change lever
Steel ball 5
1. Remove Cam holder complete together with
Change lever from Armature.
2. Separate Change lever, Steel ball 5 and Plate 19
from Cam holder complete.
Plate 19
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Helical Gear 39, Ball Bearing 6002LLB (cont.)

P 7/ 12
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. Cam Complete, Change Lever (cont.)
ASSEMBLING
(1) Cam complete can be assembled to Cam holder complete as drawn in Fig. 9.
DISASSEMBLING
(4) Disassemble Cam complete from Cam holder as drawn in Fig. 8.
Fig. 8
Fig. 9
Cam complete
Cam holder
Notch
1R031
Small square mark
1R278
1R258 1R258
Put Cam holder complete onto 1R258, and set 2 pcs. of 1R278 to the holes of Cam holder complete.
And then press 2 pcs. of 1R278 with Arbor press to disassemble Cam complete from Cam holder.
Cam complete
Cam holder
1. Set Cam complete to Cam holder while
aligning the notch of Cam complete
to the small square mark on Cam holder.
2. Put Cam holder with Cam complete onto 2 pcs. of 1R258.
And apply 1R031 to Cam complete, and then press 1R031
with Arbor press.
Cam complete
Cam holder
complete
1R258 1R258

P 8/ 12
Repair
(2) Assemble Change lever to Cam holder complete as drawn in Fig. 10.
(3) Assemble Cam holder compete to Armature by reversing the Disassembly procedure.
(Refer to the left illustration in Fig. 7.)
ASSEMBLING
Fig. 10
Groove for
fitting Plate 19 Plate 19
1. Assemble Plate 19 to Cam holder complete by fitting it
to the groove in Cam holder complete.
Steel ball 5
2. Apply a little amount of Makita grease
N No.2 to Change lever at the portion
designated with black triangle.
And mount Steel ball 5 to Change lever.
Projection Projection
Groove
Change lever
Cam side of
Cam holder complete
Change lever
3. Assemble Change lever to Cam holder complete as drawn below.
Note: Fit Projection of the lever to the groove of Cam holder complete
when assembling them.
[3] DISASSEMBLY/ASSEMBLY
[3] -3. Cam Complete, Change Lever (cont.)

Circuit diagram
P 9/ 12
White
Note:
Brush holder A: Change lever side
Brush holder B: Switch side
Color index of lead wires' sheath
Black
Red
Orange
Purple
Areas where suppression of radio interference is required
Fig. D-1
Brush holder A
Top
Top view
Left
Left side
view
Brush holder B
Choke coil
(purple)
Choke coil
(orange)
Field
Power supply cord
Switch Switch
Noise
suppressor
Blue lead wire is used
for some countries.
Brown lead wire is used
for some countries.

Switch
Wiring diagram
P 10/ 12
Wiring in Housing set (L)
Areas where suppression of radio interference is required
Setting of Brush holders
Fig. D-2
Brush holder
Rib A
Rib B
Housing (L)
Put Brush holders as drawn below so that the Lead wires
can be connected to them approaching from rear side.
Switch
Change lever side
Window of
Brush holder
Brush holder
Brush holder
While facing the window of Brush holder
to Housing (L) side, put it in the position
of Change lever side.
While facing the window of Brush holder
to Housing (R) side, put it in the position
of Switch side.
Power supply cord
Noise suppressor
Put Choke coil (purple) in the position
shown below.
Put Choke coil (orange)
in the position
shown in the right.
Fix Field lead wires (black)
with this Lead wire holder.
Put Field lead wires and
Power supply cord (brown
or black) between Rib A
and Rib B.
Put Noise suppressor
in the position
shown in the right.
Put Field lead wires (black, white)
under Brush holder.

P 11/ 12
Circuit diagram
White
Note:
Brush holder A: Change lever side
Brush holder B: Switch side
Color index of lead wires' sheath
Black
Red
Orange
Purple
Areas where suppression of radio interference is not required
Fig. D-1A
Brush holder A
Top
Top view
Left
Left side
view
Brush holder B
Field
Power supply cord
Switch Switch
Blue lead wire is used
for some countries.
Brown lead wire is used
for some countries.

Wiring diagram
P 12/ 12
Wiring in Housing set (L)
Areas where suppression of radio interference is not required
Setting of Brush holders
Fig. D-2A
Brush holder
Rib A
Rib B
Housing (L)
Put Brush holders as drawn below so that the Lead wires
can be connected to them approaching from rear side.
Switch
Change lever side
Window of
Brush holder
Brush holder
Brush holder
While facing the window of Brush holder
to Housing (L) side, put it in the position
of Change lever side.
While facing the window of Brush holder
to Housing (R) side, put it in the position
of Switch side.
Power supply cord
Fix Field lead wires (black)
with this Lead wire holder.
Put Field lead wires and
Power supply cord (brown
or black) between Rib A
and Rib B.
Put Field lead wires (black, white)
under Brush holder.