Makita Maktec MT921 Manual

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 vary by country.

MT921

Finishing Sander

Dimensions: mm (")

Width (W)

Height (H)

Length (L) 214 (8-3/8)

92 (3-5/8)

147 (5-3/4)

Continuous Rating (W)

Voltage (V) Cycle (Hz) Input Output

Max. Output (W)

110

220

240

1.7

0.9

0.8

50/60

180

45120 1.6 50/60 --- 60

45230 0.9 50/60 180 60

Current (A)

Pad size: mm (") 93 x 185 (3-5/8 x 7-1/4)

Double insulation

Net weight: kg (lbs)

Power supply cord: m (ft)

Abrasive paper size: mm (") 93 x 228 (3-5/8 x 9)

Yes

2.0 (6.6)

1.3 (2.9)

Orbits per minute: min.-1= opm 12,000

Strokes per minute: min.-1= spm 24,000

Abrasive paper 93-120 ....................... 1 pc

Abrasive paper 93-60

Abrasive paper 93-80

Abrasive paper 93-100

Abrasive paper 93-120

Abrasive paper 93-150

TECHNICAL INFORMATION

Model MT921 has been developed on the design concept;

"easy-to-control" is the key factor to a finishing sander with

strong marketability.

The main benefits are:

Ergonomic grip contoured for easy handling

both in single- and double-handed operation

Industrial performance and durability at less expense

Paper fastening

system

Hook & loop

Clamp

P 2/ 5

CAUTION: Unplug the machine for safety before repair/ maintenance in accordance with

the instruction manual!

Repair

[2] Disassembly/ Assembly

[2]-1. Armature

[1] NECESSARY REPAIRING TOOLS

DescriptionCode No.

DISASSEMBLING

1) Remove M4x14 Pan head screw (4pcs.) and Top cover. (Fig. 1)

2) Remove Brush holders together with Carbon brushes.

3) M4x10 Pan head screw (4pcs.) and Pad complete. (Fig. 2)

4) Remove Cap 33 in the center of Base. (Fig. 3)

5) Insert slotted screwdriver between Base and Motor housing, and while

holding Fan 68 as illustrated in Fig. 4, separate Base section from

the machine by removing M4x10 countersunk head screw and Flat

washer 6 that secure Fan 68. (Fig. 5)

6) Remove Fan 68 from Armature. (Fig. 6)

7) Remove 4x18 Tapping screw (4pcs.) for securing Bearing box to

Motor housing. (Fig. 7)

8) Remove Armature together with Bearing box from Motor housing by

striking Motor housing with plastic hammer as illustrated in Fig. 8.

1R027 Bearing setting pipe 18-10.2 Removing Armature

Removing Ball bearing

1R269 Bearing extractor

Use for

Fig. 1

Fig. 4

Fig. 2

Fig. 5

Fig. 8

Fig. 6 Fig. 7

Fig. 3

M4x14 Pan head

screw (4pcs.)

Top cover

M4x10 Pan

head screw (4pcs.)

Pad complete

Cap 33 slotted screwdriver

4x18 Tapping screw (4pcs.)

Bearing

box

Fan 68

slotted

screwdriver

Fan 68

M4x10 countersunk

head screw Base section

plastic hammer

Armature

Bearing box

Flat washer 6

Motor housing

P 3/ 5

Repair

[2] Disassembly/ Assembly

[2]-1. Armature (cont.)

DISASSEMBLING

9) Remove Armature from Bearing box by striking the armature shaft end.

When it is difficult to remove Armature in the above manner, put

Bearing box on U-shape base of arbor press, then press down

Ball bearing 6200LLB of Armature using 1R027 and arbor press.

(Fig. 9)

10) Remove Ball bearing 606ZZ from the commutator-end of Armature shaft

using 1R269 and waterpump pliers. (Fig. 10)

Note: Be sure to firmly hold the jaws of 1R269 with waterpump pliers

because the space between Insulation washer and Ball bearing

606ZZ is so tight that Ball bearing 606ZZ cannot be securely

held with the jaws of 1R269.

11) Remove Ball bearing 6200LLB from the drive-end of Armature shaft

using 1R269. (Fig. 11)

Note: Before attaching 1R269 to Ball bearing 6200LLB, be sure to

fasten M4x10 +Countersunk head screw to the drivee-end of

Armature shaft in order not to damage to the threads inside

Armature shaft.

Fig. 9

Fig. 10 Fig. 11

M4x10 +Countersunk

head screw

1R027

Ball bearing

6200LLB of

Armature

1R269 waterpump pliers

Ball bearing 606ZZ

Ball bearing

6200LLB

Flat washer 10

Take the disassembling step in reverse.

Note: Be sure to set Flat washer 10 in place before pressfitting Ball bearing 6200LLB to Armature shaft. (Fig. 11)

Insulation washer

Bearing box

U shape base

of arbor press

P 4/ 5

Circuit diagram

Fig. D-1

Power supply cord

Brown color is used

for some countries.

Switch

Brush holder A

Terminal block

(if used)

Viewed from Top cover

Field

Noise suppressor

(if used)

Blue color is used

for some countries.

Power supply cord

Brush holder B

Brush

holder B

Brush

holder A

Color index of lead wires' sheath

Black

White

Orange

Purple

P 5/ 5

Wiring diagram

Fig. D-2

Power supply cord

small notch

Lead wires

Set Terminal block (if used)

into place between four ribs.

Switch

Brush holder BBrush holder A

Insulated terminal

Area BArea A

Fix Field lead wires with Lead

wire holders to prevent slacks

near Armature.

Fix Field lead wires

with Lead wire holders

to prevent slacks near

Armature.

Connect Insulated terminals A and B

with Brush holders A and B.

And set each Brush holders carefully in

place so as not to put on Areas A and B

illustrated left.

(Bending the insulated terminals is

allowed.)

Field lead wireField lead wire

Noise suppressor

(if used)

Set Noise suppressor in place so that

the lead wires face the inserted direction

and the lead wires pass through the small notch.

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