Makita Maktec MT925 Handbuch

Model No. MT925, MT925G

Description Finishing Sander

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

Max. Output (W)

110

220

240

1.7

0.9

0.8

50/60

180

25120 1.6 50/60 --- 50

Current (A)

230 0.9 50/60 180 5025

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

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

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.

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