Makita Maktec MT920 Handbuch

Model No.

Description

PRODUCT

CONCEPT AND MAIN APPLICATIONS

P 1 /5

Specification

Standard equipment

Optional accessories

Note: The standard equipment for the tool shown above may differ by country.

MT920

Finishing Sander

Model MT920 has been developed as the first maktec palm sander, featuring:

Slim grip for easy horizontal and overhead applications

Industrial performance and durability at less expense

Dimensions: mm (")

Width (W)

Height (H)

Length (L) 110 (4-5/16)

112 (4-3/8)

133 (5-1/4)

Continuous Rating (W)

Voltage (V) Cycle (Hz) Input Output

Max. Output (W)

110

220

240

1.7

0.9

0.8

50/60

180

Current (A)

Pad size: mm (") 112 x 102 (4-3/8 x 4)

Double insulation

Net weight: kg (lbs)

Power supply cord: m (ft)

Abrasive paper size: mm (") 114 x 140 (4-1/2 x 5-1/2)

Yes

2.0 (6.6)

0.9 (2.0)

Orbits per minute: min.-1= opm 14,000

Strokes per minute: min.-1= spm 28,000

Abrasive paper 114-60 ....................... 2 pcs

Abrasive paper 114-100 ..................... 2 pcs

Abrasive paper 114-150 ..................... 2 pcs

Abrasive paper 114-60

Abrasive paper 114-80

Abrasive paper 114-100

Abrasive paper 114-150

TECHNICAL INFORMATION

P 2 /5

[2] LUBRICATION

[3] DISASSEMBLY/ASSEMBLY

[Armature]

Lubrication is not required for this product because no gear is used for transmission.

1) Remove Base and Fan 65 from Armature as illustrated in Figs. 1, 2, 3.

[1] NECESSARY REPAIRING TOOLS

CAUTION: Unplug the machine for safety before repair/ maintenance,

in accordance with the instruction manual!

1R027 Bearing setting pipe 18-10.2 Removing Armature from Bearing box

Removing Ball bearings from Armature1R269 Bearing extractor

Repair

Locking Fan 65 with a slotted screwdriver or the like,

remove M4x10 +Countersunk head screw and Flat washer 6.

Fan 65 and Base can now

be removed from Armature.

Remove Pad complete by unscrewing four

M4x10 +Pan head screws.

Remove Top cover by unscrewing three

M4x20 Pan head screws, then disconnect

Carbon brush from Armature commutator.

Flat washer 6

Fan 65

Fig. 1 Fig. 2

Fig. 3

Base

Ball bearing 6001ZZ

DISASSEMBLING

DescriptionCode No. Use for

Pan head screw

M4x20 (3 pcs)

+ Pan head screw

M4x10 (4 pcs)

Pad complete

Top cover

Carbon brush

(with Brush holder) +Countersunk head screw

M4x10

P 3 /5

[3] DISASSEMBLY/ASSEMBLY

[Armature] (cont.)

2) Remove four 4x18 Tapping screws. Disassemble Armature from Motor housing together with Bearing box by

tapping the end surface of Motor housing with plastic hammer as illustrated in Fig. 4.

3) Disassemble Armature from Bearing box using 1R027 and arbor press. (Fig. 5)

4) Remove Ball bearing 606ZZ from the commutator-end of Armature shaft using 1R269 and adjustable pliers, (Fig. 6)

Note: Be sure to firmly grasp the claws of 1R269 with adjustable pliers because the space between Insulation washer

and Ball bearing 606ZZ is so tight that Ball bearing 606ZZ cannot be securely grasped with the claws of 1R269.

5) Remove Ball bearing 629ZZ from the drive-end of Armature shaft using 1R269 and adjustable pliers in the same way

as described above in 4). (Fig. 7)

Important: Before attaching 1R269 to Ball bearing 629ZZ, be sure to fasten M4x10 +Countersunk head screw to

the drive-end of Armature shaft in order not to damage to the threads inside Armature shaft.

Repair

Bearing box

Armature

1R027

Fig. 5

Fig. 6 Fig. 7

Tapping screw

bind 4x18 (4 pcs) Bearing box Armature

Motor housing

Fig. 4

Ball bearing 629ZZ

Washer 9

Ball bearing 606ZZ

Insulation washer

DISASSEMBLING

1R269

adjustable pliers

+Countersunk head

screw M4x10

P 4 /5

[3] DISASSEMBLY/ASSEMBLY

[Armature]

Repair

Do the reverse of the disassembling steps.

Note: Washer 9 is not reversible when assembled to

the drive-end of Armature shaft.

Be sure to place its convex side on Fan 65 side

as illustrated in Fig. 8.

ASSEMBLING

Ball bearing 629ZZ

Washer 9

Fan 65

Convex side

Bearing box

drive-end of

Armature shaft

Fig. 8

Circuit diagram

Wiring diagram

P 5 /5

Terminal block

Noise suppressor*

Fig. 9

Fig. 10

Field

Switch

Power supply cord

Color index of lead wires' sheath

Black

White

*Noise suppressor is not used

for some countries.

Brown for some countries

Blue for some countries

opening 1

Noise suppressor (if used)

Terminal block

Power supply cord

Switch

Brush

holder

Strain relief

Lead wire holder 1

Lead wire holders 2, 3

groove

space 1

space 2

Route Lead wires as illustrated in Fig. 10.

1 4 Field lead wire (black):

Route through the opening 1/opening 2 of

Motor housing, then connect to Brush holder.

Note: Be sure to fix with Lead wire holder 1/

Lead wire holder 6.

2 Field lead wire (white):

Route through the opening 1 of Motor housing,

then connect to Switch.

Note: Be sure to fix with Lead wire holders 2, 3.

3 Lead wire of Noise suppressor (white):

Connect to Switch.

Note: Be sure to fix with Lead wire holders 4, 5.

5 Field lead wire (white):

Route through the opening 2 of Motor housing,

then connect to Terminal block.

6 Lead wire (white) of Noise suppressor:

Connect to Terminal block.

7 Lead wire (white or blue) of Power supply cord:

Connect to Terminal block.

8 Lead wire (black or brown) of Power supply cord:

Connect to Switch.

Note: Be sure to route through the groove of Motor housing.

Note: Put slack portions of Lead wires in spaces 1 and 2.

opening 2

Lead wire holders 4, 5

Lead wire holder 6

[Motor housing viewed from top]

Brush holder

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