Makita Maktec MT92A Manual

PRODUCT

CONCEPT AND MAIN APPLICATIONS

P 1/ 9

Specification

Standard equipment

Dimensions: mm (")

Width (W)

Height (H)

Length (L)

MT92B

250 (9-7/8)

439 (17-1/4)

MT92A

200 (7-7/8)

141 (5-9/16)

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

These maktec brand angle grinders MT92A and MT92B have been

designed for price competitive markets.

New maktec design is employed to eliminate white printing

and polygonal line from maktec logo/ elastomer from handle

for the cost effectiveness.

Optional accessories

Model No.

Description

MT92A, MT92B

Angle Grinders 180mm (7"), 230mm (9")

Lock nut wrench 35 ...................... 1

Grip 36 complete .......................... 1

240 50/609.6 2,200 1,700

220 50/6010.5 2,200 1,700 2,900

2,900

230 50/6010.0 2,200 1,700 2,900

Continuous Rating (W)

Voltage (V) Cycle (Hz) Input Output Max. Output (W)Current (A)

No load speed: min.ˉ¹= rpm

180 (7)

22.23 (7/8)

Weight according to

EPTA-Procedure 01/2003*: kg (lbs) 5.0 (11.0)

*with Wheel cover, Inner flange, Lock nut, and Side grip

Model No.

Diameter

Hole diameterWheel size: mm (")

MT92A

8,500

Protection against electric shock Double insulation

Specification

Power supply cord: m (ft) 2.0 (6.6)

230 (9)

22.23 (7/8)

6 (1/4)Max. thickness 6 (1/4)

5.3 (11.6)

MT92B

6,600

Double insulation

2.0 (6.6)

The above image

is Model MT92A.

TECHNICAL INFORMATION

P 2/ 9

Repair

[3] DISASSEMBLY/ASSEMBLY

[3] -1. Difference of Gears between MT92A and MT92B

[1] NECESSARY REPAIRING TOOLS

CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.

Code No. Description Use for

[2] LUBRICATION

Apply Makita grease N No.1 to the following portions designated with the black triangle to protect parts and product

from unusual abrasion.

Fig. 1

Item No. Description

Spiral bevel gear 53A for Model MT92A

Spiral bevel gear 53B for Model MT92B

Bearing box

Amount

approx. 60g

Portion to lubricate

Retaining ring R pliers RT-2E

1R004 Retaining ring pliers ST-2 disassembling/ assembling Ring spring 13

1R006

1R026

1R269

1R282

disassembling/ assembling Retaining ring R-32

Bearing setting pipe 16-8.2 removing Spiral bevel gear 53A or 53B

removing Ball bearingsBearing extractor

Round bar for Arbor 8-50

Gear housing Gear room for smooth engaging of Spiral bevel gears

Model No. Small spiral bevel gear

(Gear on Armature shaft)

Large spiral bevel gear

(Gear on Spindle)

Refer to the following gears. They are not interchangeable.

MT92A

MT92B

Number of teeth: 16

Spiral bevel gear 16

Spiral bevel gear 12 Spiral bevel gear 53B

Spiral bevel gear 53A

Number of teeth: 12

24.5 mm

19mm

Spiral bevel gear 16 for Model MT92A

Spiral bevel gear 12 for Model MT92B

grooved

not grooved

P 3/ 9

Repair

[3] DISASSEMBLY/ASSEMBLY

[3]-2. Small spiral bevel gear, Armature, Ball bearings 6201DDW and 629ZZ

DISASSEMBLING

1. Remove Brush holder caps and Carbon brushes from Motor housing,

then separate Gear housing together with Armature from Motor

housing by unscrewing four 5x35 Tapping screws.

(1) Separate Gear housing from Motor housing and remove Bearing box section from Gear housing. ( Fig. 2)

2. Remove Bearing box section

by unscrewing four 5x35

Hex socket head bolts.

Fig. 2

Brush holder cap Carbon brush

Brush holder cap

Armature

5x35 Tapping

screw (4 pcs)

Carbon brush

Gear housing

Motor housing

Bearing box

section

5x35 Tapping

screw (4 pcs.)

(2) Disassemble Armature and Small spiral bevel gear. (Fig. 3)

Wrench 13 for holding

M7 Hex nut M7 Hex nut

2. Pull off Armature while holding

Small spiral bevel gear.

Small spiral bevel gear

M7 Hex nut

Armature

Fig. 3

1. While holding M7 Hex nut with Wrench 13,

turn Armature counterclockwise by hand.

M7 Hex nut can be removed.

Note: If it is difficult to pull off Armature by hand, do the following steps.

1. Lubricate Small spiral bevel gear and Armature shaft with spray lubricant.

2. Wrap the gear with a cloth to protect the gear teeth.

3. By

using Water pump pliers, firmly grip the gear wrapped with a cloth, and then turn and pull Armature.

P 4/ 9

Repair

DISASSEMBLING

ASSEMBLING

(3) Disassemble Ball bearings 6201DDW and 629ZZ. (Fig. 4)

Note: The removed Armature and small Spiral bevel gear are employed as repairing tools when removing

Ball bearing 6201DDW from Gear housing.

(1) Armature can be also used as an assembling jig for Ball bearing 6201DDW to Gear housing. (Fig. 5)

Retaining

ring R-32

1. Remove Retaining ring

R-32 with 1R006.

2. Assemble Armature into Gear housing,

then set Small spiral bevel gear and

M7 Hex nut in place on Armature

shaft temporarily.

1R006

Ball bearing

6201DDW

Ball bearing 6201DDW

M7 Hex nut

Small spiral

bevel gear

3. Tap the end of Gear housing

with a plastic hammer.

Ball bearing 6201DDW can be

removed together with Armature.

4. Remove M7 Hex nut and Small spiral bevel gear again.

Ball bearing 6201DDW can be removed by hand.

M7 Hex nut

O rig 32

1R269

Ball bearing

6201DDW

Ball bearing 629ZZ

5. Remove Ball bearing 629ZZ with 1R269.

Small spiral bevel gear

Fig. 4

Fig. 5

2. Set Ball bearing 6201DDW to Armature temporarily and Assemble the bearing

into Gear housing by using with Armature as a jig, then pull off Armature from

the bearing. And then assemble Retaining ring R-32 with 1R006.

Ball bearing 6201DDW

1R006

Retaining

ring R-32

Ball bearing

6201DDW

1. Make sure that O ring 32

is set in Bearing box of

Gear housing in advance.

(2) Assemble Spiral bevel gear 16 or 12 and M7 Hex nut to Armature shaft by reversing the disassembly procedure.

(Fig. 3)

[3] DISASSEMBLY/ASSEMBLY

[3]-2. Small spiral bevel gear, Armature, Ball bearings 6201DDW and 629ZZ (cont.)

P 5/ 9

Repair

[3] DISASSEMBLY/ASSEMBLY

[3]-3. Large spiral bevel gear, Ball bearing 6202DDW and Ball bearing 607ZZ

DISASSEMBLING

(1) No need to separate Motor housing from Gear housing. Separate Bearing box section from Gear housing,

and remove Ball bearing 607ZZ and Ring spring 13 from Spindle. (Fig. 6)

1. Remove Bearing box section

by unscrewing four 5x35 Hex

socket head bolts.

2. Remove Ball bearing

607ZZ with 1R269.

Fig. 6

3. While opening Ring spring 13 with 1R004,

lift Ring spring 13 up from the opposite

side of 1R004 with Slotted screwdriver

and remove the spring from Spindle.

1R269

Ball bearing

607ZZ

Ring spring 13

Slotted screwdriver

1R004

Large spiral bevel gear

(2) Disassemble Spindle. (Fig. 7)

Fig. 7

1R026

4. Strike 1R026 carefully with Ram

until Spindle is slightly shifted

as drawn below.

5. Remove 1R026.

6. Set 1R282 onto Spindle,

and remove Spindle

by pressing down with

Arbor press.

Ram of

Arbor press

1. Put Bearing box onto Turn base of

Arbor press with its Large spiral

bevel gear side faced to Turn base.

2. Insert 1R026 over Spindle.

3. Set the ram of Arbor press to 20mm

higher position than the top of 1R026.

Bearing box

Turn base of Arbor press

Spindle 1R282

20mm

Large spiral

bevel gear

Note: Do not reuse Ball bearing 6203DDW when Bearing box section

is disassembled. It is inevitably damaged.

P 6/ 9

Repair

DISASSEMBLING

ASSEMBLING

(3) Disassemble Ball bearing 6202DDW. (Fig. 8)

1. Remove Bearing retainer

by unscrewing three M4x13

Pan head screws.

2. Put Bearing box onto Turn base of Arbor press with its Ball bearing

mounting side faced to Turn base.

Set Spindle on Ball bearing 6202DDW by using with Spindle as a jig,

then remove the bearing with Arbor press.

Note: Do not reuse Ball bearing 6202DDW when removing Spindle in

the step of Fig. 7. It is inevitably damaged.

Fig. 8

Bearing

retainer

Assemble Bearing box section as follows:

(1) Mount Ball bearing 6202DDW to Bearing box. And mount Bearing retainer. (Refer to Fig. 8)

(2) Mount Spindle by pressing it with Arbor press. (Refer to Fig. 7)

(3) Assemble large Spiral bevel gear and secure it with Ring spring 13. And mount Ball bearing 607ZZ to Spindle.

(Refer to Fig. 6)

M4x14

Pan head

screw (3pcs.)

[3] DISASSEMBLY/ASSEMBLY

[3]-3. Large spiral bevel gear, Ball bearing 6202DDW and Ball bearing 607ZZ (cont.)

Ball bearing 6202DDW

Spindle

P 7/ 9

Repair

[3] DISASSEMBLY/ASSEMBLY

[3]-4. Shaft Lock

DISASSEMBLING

(1) Remove Bearing box section from Gear housing complete. (Fig. 2)

(2) Disassemble Shaft lock mechanism as drawn in Figs. 9 and 10.

Set the machine on 1R350, then apply 1R268 to Shoulder pin 5

through the small Hole on Pin cap, and then tap 1R268 with

Plastic hammer.

Shoulder pin 5 comes out from Gear housing complete.

Release 1R268 from Pin cap carefully

so that Pin cap does not be slung by

Compression spring 12.

Shoulder Pin 5

Pin Cap

Compression

Spring 12

1R268

1R350

Fig. 9 Fig. 10

ASSEMBLY

Fig. 11 Fig. 12

(1) Be sure to use a new Pin cap for replacement and to remove all the plastic dust on Shoulder pin 5. (Fig. 11)

(2) Assemble the Parts for Shaft lock mechanism as drawn in Fig. 12.

Plastic Dust

Shoulder Pin 5

2. Assemble Compression spring 12

and Pin cap by pressing them to

Shoulder pin 5.

1. Insert Shoulder pin 5 through

the hole of Gear housing complete.

Remove Plastic dust from

the constricted part of

Shoulder pin 5.

Pin Cap

Compression

Spring 12

Circuit diagram

Wiring diagram

P 8/ 9

MT92A, MT92B

Fig. D-1

Fig. D-2

White

Power supply

cord

This Lead wire is black

for some counties.

This Lead wire is white

for some counties.

Switch

Field

Field viewed from

Commutator side

Noise

suppressor

Handle set (L) side

Handle set (R) side

Color index of lead wires' sheath

Black Blue

Brown

Wiring of Field Lead Wires

Hook

Noise suppressor is not used

for some countries.

Pass Field lead wire

through hook.

Pass Field lead wire

through hook.

Wiring diagram

P 9/ 9

Fig. D-3

Fig. D-4

Wiring to Switch

Wiring in Handle Set (L)

Rib A

Rib B

Power supply cord

Rib C

Noise suppressor

(if it is used)

Connect connectors for Field lead wires

to Switch terminals of Handle set (L) side

while facing their Wire connecting portions

to Motor housing side.

Switch

Field lead wire

Noise suppressor

Connect Noise suppressor’s lead wires to Switch terminal

from the same direction as Field lead wires while facing

their wire connecting portions to Handle set(L) side.

Note: Noise suppressor is not used for some countries.

Put Lead wire (black or brown)

between Ribs A and B.

Do not put Noise suppressor’s

Lead wires (2 whites) on

Field Lead wires (2 blacks).

Put the slag portion of Field lead wires in this position.

Note: The slag portion can be also put in the space for

Noise suppressor if it is not used.

Pass Field lead wires (2 blacks)

through the groove.

Do not slag Field lead wires

(2 blacks) in Motor housing.

Put Noise suppressor’s Lead wire

(white) and Field Lead wire (black)

between Ribs A and C.

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