Makita Maktec MT925 Manual

Model No. MT925, MT925G
Description Finishing Sander
H
W
Dimensions: mm (")
Height (H)
Length (L) 110 (4-5/16)
112 (4-3/8)
133 (5-1/4)
Continuous Rating (W)
Cycle (Hz) Input Output
25
Max. Output (W)
110
220
240
1.7
0.9
0.8
50/60
50/60
50/60
180
180
180
50
50
25120 1.6 50/60 --- 50
50
Current (A)
25
230 0.9 50/60 180 5025
25
L
PRODUCT
P 1/ 7
Model MT925 has been developed as the cosmetic change
model of maktec finishing sander MT920, featuring:
•Slim grip for easy horizontal and overhead applications
•Industrial performance and durability at less expense
Model MT925G is Green housing model exclusively developed
for Korean market.
Width (W)
Voltage (V)
112 x 102 (4-3/8 x 4)
0.89 (2.0)
Pad size: mm (")
114 x 140 (4-1/2 x 5-1/2)
Abrasive paper size: mm (")
ø1.5 (1/16)
Protection from electric shock Double insulation
Power supply cord: m (ft)
MT925/ MT925G
Orbits per minute: opm= min.ˉ¹
Sanding strokes: spm= min.ˉ¹
Specification Model
Orbit diameter: mm (")
2.0 (6.6)
14,000
28,000
Specification
Standard equipment
Note: The standard equipment for the tool shown above may vary by country.
Abrasive paper 114-60 ....................... 2
Abrasive paper 114-100 ..................... 2
Abrasive paper 114-150 ..................... 2
Weight according to EPTA-Procedure 01/2003: kg (lbs)
CONCEPT AND MAIN APPLICATIONS
TECHNICAL INFORMATION
Optional accessories
TBA

P 2/7
Repair
Lubrication is not required for this product because no gear is used for transmission.
(1) Remove Carbon brushes and Brush holders from Motor housing as drawn in Fig. 1.
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Armature
[1] NECESSARY REPAIRING TOOLS
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
Code No. Description Use for
1R027 Bearing setting pipe 18-10.2 removing Armature
1R269 Bearing extractor removing Ball bearings 629DDW, 606ZZ
[2] LUBRICATION
DISASSEMBLING
3. Insert a small slotted screwdriver between
Armature’s commutator and Carbon brush
carefully, and hold the terminal of Brush
holder with Long nose pliers.
4. Then, lift up Brush holder vertically together with
Carbon brush while pressing Carbon brush with
the screwdriver.
Remove the other Brush holder and Carbon brush
in the same manner.
Note: Do not bend terminals of Brush holders.
Do not scratch the commutator of Armature.
Carbon brushes
Brush holder
Brush holder
Fig. 1
Terminal of
Brush holder
Carbon brush
Small slotted
Screwdriver
Small slotted
Screwdriver
Long nose
pliers
Long nose
pliers
1. Remove Top cover by
unscrewing three 4x18
Tapping screws.
2. Disconnect Field lead wires
by pulling off Receptacles
from the terminals of Brush
holders.

P 3/7
Repair
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Armature (cont.)
DISASSEMBLING
Cap 28
1. Remove Pad complete
by unscrewing four
M4x10 +Pan head screws.
2. Remove Cap 28 by levering
up with slotted screwdriver.
3. While holding Fan 65 by inserting slotted
screwdriver from the gap between Motor
housing and Base, remove M4x10
+Countersunk head screw.
Slotted
screwdriver
Motor
housing
Pad complete Base
M4x10 +Countersunk
head screw
Base
Flat washer 6
4. After removing Flat washer 6,
Base is removed together with
Ball bearing 6001ZZ.
5. Remove Sponge sleeves and Foots
with O rings 4 from Bearing box.
6. Remove Fan 65 from Armature
shaft.
Ball bearing
6001ZZ
Bearing box
(2) Disassemble the parts in bottom section and remove Armature from Motor housing as drawn in Fig. 2.
7. Remove four 4x18 Tapping screws that
fasten Bearing box to Motor housing.
Fig. 2
4x18 Tapping
screws
O ring 4 (8 pcs.)
Foot
(4 pcs.)
Sponge
sleeve
(4 pcs.)
Fan 65
Caution:
Sponge sleeves, Foots and O rings may be left to Base.
Be careful not to lose them when Base is turned upside down.
8. Disassemble Armature assembly and Bearing box from
Motor housing by tapping the skirt portion of Motor
housing with plastic hammer.

P 4/7
Repair
DISASSEMBLING
Fig. 3
Fig. 3-A
2. Press Ball bearing 629DDW with 1R027.
Armature ass’y is now removed from
Bearing box.
1. Hold Bearing box at the U-formed portion
on the turn table of Arbor press.
And then put 1R027 onto Ball bearing 629DDW
of Armature ass’y.
1R027
Ball bearing
629DDW
Ball bearing
629DDW
Washer 9
Ball bearing
606ZZ
Insulation
washer
3. Remove Ball bearings from Armature shaft using 1R269 and Water pump pliers.
Note: There are little space between Ball bearing 606ZZ and Insulation washer (Fig. 3-A)/ Ball bearing
629DDW and Washer 9 (Fig. 3-B).
Therefore, hold the jaws of 1R269 with Water pump pliers to retain Ball bearing securely.
Temporarily tighten M4x18 Pan head screw to Armature shaft to protect the female thread when
removing Ball bearing 629DDW (Fig. 3-B).
1R269
Water pump pliers
M4x18 Pan
head screw
(3) Separate Armature assembly from Bearing box and remove Ball bearings from Armature shaft as drawn in Fig. 3.
Fig. 3-B
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Armature (cont.)

P 5/ 7
Repair
ASSEMBLING
Fig. 4 Fig. 5
O ring 4
Foot
O ring 4
Sponge
sleeve
Fan 65 side
Assemble by reversing disassembly procedure. (Refer to Figs. 3 and 2)
Washer 9
Armature
Convex portion
When fixing Washer 9 to Armature shaft,
face the convex portion to Fan 65 side.
Put O rings 4 and Sponge sleeve to Foot.
And then, mount them to Bearing box.
Ball bearing
629DDW
Bearing box
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Armature (cont.)
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Lever (for Clamping Abrasive Paper)
DISASSEMBLING
Fig. 6
Lever (=paper clamp) can be replaced without removing Base from the machine as drawn in Fig. 6.
1. Loosen this M4x12
Tapping screw a little bit.
Groove
Notch
2. Release this portion of Lever
from the notch on Base.
3. Remove this portion of Lever
from the groove on Base.
4. Remove the end of Lever out of the hole, then move
Lever along the space between Base and Motor housing.

Circuit diagram
P 6/ 7
Color index of lead wires' sheath
Black
White
Noise
suppressor
Power supply cord
Field
Brush
holder
Brush
holder
Switch
Terminal
block
Fig. D-1
Fig. D-2
Brush holder’s
terminal
Cord clamp
Switch
Wire connecting portion
Wire connecting portion
Receptacle for connecting left Brush holder:
Face the wire connecting portion
to switch side.
Wiring diagram
Connecting Receptacles to Brush holder
Brown lead wire is used
for some countries.
Blue lead wire is used
for some countries.
Receptacle for connecting right Brush holder:
Face the wire connecting portion
to Cord clamp side.
Noise suppressor is not
used for some countries.

P 7/ 7
Wiring diagram
Fig. D-3
Fix Field lead wire (white) for Switch
with these Lead wire holders.
Wiring in Motor Housing Top
Fix Field lead wire (black)
for Brush holder with this
lead wire holder.
Fix Field lead wire (black)
for Brush holder with this
lead wire holder.
Noise suppressor is not
used for some countries.
Noise suppressor
Route Power supply cord
Lead wire (black) through
this groove and connect
the lead wire with Switch
terminal.
Put the slack portion of
Lead wires in this place.
Put the slack portion of
Lead wires in this place.
Fix Lead wires of Noise
suppressor in these Lead
wire holders if Noise
suppressor is used.