Makita GA7020R Handbuch

Model No.

Description

CONCEPT AND MAIN APPLICATIONS

P 1/ 9

Standard equipment

Optional accessories

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

GA7020R/ GA9020R

Models GA7020R/ GA9020R are developed as sister tools of

GA7020S/ GA9020S.

Additionally to the benefits of models GA7020S/ GA9020S,

GA7020R/ GA9020R feature:

- Anti-restart function

- Large trigger switch with a lock lever having two different

actions for releasing the switch from Lock-off position and

locking the switch on in order to comply with the requirement

of the new IEC Regulations

Wheel size is:

180mm (7'') for Model GA7020R

230mm (9'') for Model GA9020R

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

Side grip 36 ...................... 1 pc

Dimensions: mm (")

Width (W)

Height (H)

Length (L)

Model No. GA7020R GA9020R

473 (18-5/8)

200 (7-7/8) 250 (9-7/8)

140 (5-1/2)

Vibration absorbing side grip

Toolless quick adjustable wheel cover

Toolless lock nut

Dust cover attachment

Plastic carrying case

GA7020R: Accessories for 180mm angle grinder

GA9020R: Accessories for 230mm angle grinder

Specification

Continuous Rating (W)

Cycle (Hz) Input Output Max. Output (W)

50/ 60

1,650

---

2,200

1,100

1,400

2,750

3,300

Voltage (V)

110

120

220

230

240

10.5

9.6

Current (A)

Angle Grinders 180mm (7'')/ 230mm (9'')

PRODUCT

TECHNICAL INFORMATION

Net weight*3: kg (lbs)

Power supply cord: m (ft)

GA7020R GA9020R

6,6008,500

Yes

180 (7)

22.23 (7/8)

230 (9)

2.0 (6.6)*1/ 2.5 (8.2)*2

5.6 (12.4) 5.8 (12.8)

Specification

Soft start feature

Anti-restart function

Double insulation

No load speed: min-1= rpm.

Wheel size: mm (") Diameter

Model No.

Hole diameter

*1 for Brazil, Australia

*2 for all countries except the two listed above

*3 Weight according to EPTA-Procedure 01/2003, with Side grip, Wheel cover, Inner flange, Lock nut

P 2/ 9

Repair

[1] NECESSARY REPAIRING TOOLS

[2] LUBRICATIONS

Fig. 1

Code No. Description Use for

1R004 Retaining ring pliers ST-2 Removing Retaining ring 15 from Spindle ass’y

1R252 Round bar for arbor 30-100 Assembling Felt ring 18 to Gear housing complete

1R269 Bearing extractor Assembling / disassembling Ball bearings

1R005 Retaining ring pliers RT-2N Removing Retaining ring R-42 from Gear housing complete

Assembling large Spiral bevel gear to Spindle ass’y

1R165 Ring spring setting tool B

Item No.

Apply the following lubricant to protect parts and product from unusual abrasion.

Description Portion to lubricate AmountLubricant

5Gear housing complete Gear room

not grooved

grooved

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

60g

Makita grease SG No.0

[3] DIFFERENCE BETWEEN GA7020R AND GA9020R

Item No. Parts of GA7020R

Spiral bevel gear 16 Spiral bevel gear 12

Parts of GA9020R

In addition to Wheel cover and available Wheels, the following parts are different.

Spiral bevel gear 53B Spiral bevel gear 53A

Small spiral bevel gear

Description in Technical information

Large spiral bevel gear

P 3/ 9

Repair

[4] DISASSEMBLY/ASSEMBLY

[4]-1. Armature, Small spiral bevel gear, Ball bearing 6301DDW

DISASSEMBLING

5x35 Tapping screw (4pcs.)

(1) Disassemble Armature and Small spiral bevel gear as illustrated in Figs. 2 and 3.

(2) Disassemble Ball bearing 6301DDW as illustrated in Figs. 4 and 5.

M6x22 Hex socket head bolt

(4pcs.)

Brush holder cap

Carbon brush

Armature

Turn Armature counterclockwise while

holding M8 Hex nut with Wrench 13.

M8 Hex nut can be removed.

Remove Carbon brushes. And then

remove 5x35 Tapping screws.

Remove Gear housing complete

together with Armature.

Remove Bearing box and M6x22

Hex socket head bolts.

Wrench 13 for locking M8 Hex nut

M8 Hex nut

Pull off Armature while

holding Small spiral bevel gear.

Small spiral

bevel gear

Armature

Fig. 2

Fig. 3

Remove Retaining ring R-42 with 1R005,

then remove Flat washer 20.

Fig. 4 Fig. 5

Retaining ring

R-42

Flat washer 20

Ball bearing 6301DDW

M8 Hex nut Small spiral bevel gear

Ball bearing 6301DDW

Felt ring 18 (a component of Gear housing complete)

Rubber ring 38

Gear housing complete

Set Armature and Small spiral bevel gear to Gear housing complete.

And set M8 hex nut in place temporarily by reversing the step of

Fig. 3.

Tap the end of Gear housing complete with a plastic hammer.

Ball bearing 6301DDW can be removed from Rubber ring 38 in

Gear housing complete. Felt ring 18 falls off at that time.

Gear housing complete

Note: If the above work is very difficult

due to the seizing of Small spiral

bevel gear, spray a lubricant

between Armature shaft and Small

spiral bevel gear. And then turn

and pull Armature while holding

Small spiral bevel gear with pliers

and a cloth.

P 4/ 9

Repair

[4] DISASSEMBLY/ASSEMBLY

[4]-1. Armature, Small spiral bevel gear, Ball bearing 6301DDW (cont.)

DISASSEMBLING

ASSEMBLING

(3) Disassemble Armature as illustrated in Fig. 6.

Assemble Gear housing section by setting Felt ring 18, Ball bearing 6301DDW, Flat washer 20 and Retaining ring R-42

in place of Gear housing complete.

(1) Set Felt ring 18 in place as illustrated in Fig. 7 when disassembling Ball bearing 6301DDW.

Remove M8 Hex nut and small Spiral bevel gear again.

Ball bearing 6301DDW can be removed by hand.

Remove Ball bearing 6200DDW with 1R269.

Fig. 6

Fig. 7

M8 Hex nut

1R269

Ball bearing 6301DDW Ball bearing 6200DDW

Small spiral bevel gear

Felt ring 18

V-block

Felt top portion

Steel cup portion

1R252

Cross-section of the bottom

of the bearing room

1R252 Rubber ring 38

Felt ring 18

Flat washer

0.5mm

Put a Flat washer (illustrated above) temporarily on Felt ring 18.

Then press down the Flat washer with arbor press and 1R252

carefully to move the Flat washer to only 0.5mm downwards.

Remove the Flat washer after setting Felt ring 18 in place.

Bottom step in Gear housing complete

28mm in outer

diameter

0.5mm in

thickness

Flat washer as a jig

Hold Gear housing complete with two

V-blocks, and pressfit Felt ring 18 into

the hole of Gear housing complete so that

the felt top portion and the bottom step of

Gear housing complete is in line.

P 5/ 9

Repair

[3] DISASSEMBLY/ASSEMBLY

[3]-1. Armature, Small spiral bevel gear, Ball bearing 6301DDW (cont.)

ASSEMBLING

(2) Assemble Ball bearing 6301DDW to Gear housing complete as illustrated in Fig. 8.

(3) Assemble Armature and small Spiral bevel gear to Gear housing complete as illustrated in Fig. 9.

Fig. 8

Armature with Ball

bearing 6301DDW Armature

Assemble Ball bearing 6301DDW to

Armature temporarily.

After setting Ball bearing 6301DDW in

place of Gear housing complete, pull off

Armature.

Retaining

ring (INT) R-42

Flat washer 20

Make sure that Rubber

ring 38 is set in place.

(Refer to Fig. 7)

Putting Flat washer 20 on Ball

bearing 6301DDW, secure them

with Retaining ring (INT) R-42.

Rubber ring 38

1R005

Small spiral

bevel gear M8

Hex nut

Armature

Ball bearing

6301DDW

Insert Armature shaft through Small spiral bevel gear

and Ball bearing 6301DDW in Gear housing.

Set M8 Hex nut to

Armature shaft.

Holding M8 Hex nut with Wrench 13,

turn Armature clockwise by hand firmly.

Fig. 9

(4) Assemble Gear housing complete to Motor housing, And assemble Bearing box section to Gear housing complete.

Reverse the disassembling step in Fig. 2.

Ball bearing

6301DDW

P 6/ 9

Repair

[3] DISASSEMBLY/ASSEMBLY

[3]-2. Large spiral bevel gear, Ball bearing 6203DDW, Ball bearing 6000LLB

DISASSEMBLING

1R269

Remove Bearing box from Gear

housing complete.

Remove Ball bearing 6000LLB

with 1R269.

Remove Spindle ass’y by pressing with Arbor press.

Ball bearing 6203DDW in Bearing box has a damage in this step.

Do not reuse Ball bearing 6203DDW after removal of Spindle ass’y.

Ball bearing

6000LLB

M6x22 Hex socket

head bolt (4pcs.) Ring spring 11

1R004

Spindle ass’y

Bearing box

Turn table of Arbor press Turn Table of Arbor Press

Bearing

retainer 50

Slotted screwdriver

Enlarging the clearance of Ring spring 11

with 1R004, lift up the opposite side

with slotted screwdriver.

Ring spring 11 can be removed.

Fig. 10

Fig. 11R

Correct setting The following wrong settings causes deforming.

Fig. 11F

Fig. 12

Large spiral bevel gear

Bearing box

M5x16 Pan head

screw (3pcs.)

Remove Bearing retainer 50 by

unscrewing three M5x16 Pan

head screw.

(1) Large spiral bevel gear can be disassembled as illustrated in Figs. 10, 11R and 12.

Ball bearing

6203DDW

The brim portion of Bearing

box is received with Turn table

of arbor press.

Labyrinth ring portion of Spindle

ass’y is received with Turn table

of arbor press.

Receive the cylindrical portion

of Bearing box with Turn table

of arbor press.

Cylindrical portion

1R165

Large spiral bevel gear

P 7/ 9

Repair

[3] DISASSEMBLY/ASSEMBLY

[3]-2. Large spiral bevel gear, Ball bearing 6203DDW, Ball bearing 6000LLB (cont.)

DISASSEMBLING

ASSEMBLING

Assemble new Ball

bearing 6203DDW.

Assemble Bearing

retainer.

Assemble Spindle ass’y.

Receive not only the brim portion

but also the cylindrical portion of

Bearing box with Turn table of Arbor

press when assembling Spindle ass’y.

(2) Ball bearing 6203DDW can be disassembled as illustrated in Fig. 13A, or Fig. 13B.

(1) Assemble Ball bearing 6203DDW and Spindle as illustrated in Fig. 14.

(2) Assemble large spiral bevel gear to Spindle as illustrated in Fig.15.

Bearing

retainer 50

M5x16 Pan head

screw (3pcs.)

Fig. 13A Fig. 13B

Fig. 14

If it is difficult to remove as illustrated

in Fig. 13A, remove Ball bearing

6203DDW with the appropriate

diameter round bar and Arbor press.

Remove Ball bearing 6203DDW by striking Bearing box

against Work table.

Ball bearing

6203DDW

Bearing box

Round bar

Ball bearing 6203DDW

Brim

Cylindrical portion of

Bearing box

Spindle

ass’y

Putting Large spiral bevel gear on 1R165, press Spindle into

Arbor hole of Large spiral bevel gear with Arbor press.

Fig.15

(3) Assemble Ring spring 11 and Ball bearing 6000LLB. (Fig. 10)

P 8/ 9

Repair

[3] DISASSEMBLY/ASSEMBLY

[3]-3. Shaft lock mechanism

DISASSEMBLING

Fig. 16

Fig. 18 Fig. 19

ASSEMBLING

(1) Remove Gear housing complete from Motor housing.

Remove Bearing box from Gear housing complete as illustrated in Fig. 2.

(2) Remove Armature from Gear housing complete as illustrated in Fig. 3.

(3) Shaft lock mechanism can be disassembled as illustrated in Figs. 16 and 17.

Applying 1R268 to Shoulder pin 5 through the small hole

on Pin cap, tap 1R268 with Plastic hammer.

Shoulder pin 5 comes out from Gear housing complete.

Release 1R268 from Pin cap while paying

attention that Pin cap would not be slung

by Compression spring 12.

Shoulder pin 5

Pin cap

Note: Do not reuse Pin cap, Removal of

Shoulder pin 5 damages the inside surface

of Pin cap, producing plastic dust.

Pin cap

Compression

spring 12

Pin cap

Compression

spring 12

Fig. 17

(1) Be sure to use a new Pin cap for replacement and to remove all the plastic dust on Shoulder pin 5. (Fig. 18)

(2) Assemble the parts for Shaft lock mechanism as illustrated in Fig. 19.

Plastic dust

O ring 9

Shoulder pin 5

Make sure that O ring 9 is

mounted to Shoulder pin 5

illustrated below.

Assemble Compression spring 12

and Pin cap by pressing them to

Shoulder pin 5.

Insert Shoulder pin 5

through the hole of Gear

housing complete.

1R268

Circuit diagram

Wiring diagram

P 9/ 9

Fig. D-1

Power supply cord Switch Noise

suppressor

Controller

Makita

logo side

Brown lead wire is used

for some countries.

Fig. D-2

Blue lead wire is used for some countries.

Blue lead wire is used

for some countries.

Makita

logo side

Pass Field lead wires (black, white)

by this Hook.

Guide out Field lead wire

(white) by this Hook.

Guide out Field lead wire

(black) by this Hook.

Belly side

(Name plate side)

Belly side (Name plate side)

Back side

(Bumper side)

White

Color index of lead wires' sheath

Black Red

Motor housing

viewed from

Commutator side

Fix Field lead wire (white)

with these Lead wire holders.

Fix Field lead wires (black, white) with this Lead wire holder.

Wiring in Motor housing

on Commutator side

Fig. D-3

Noise suppressor

Power supply cord

Lead wires of

Power supply cord

Put Lead wires of power supply

cord between Switch and Rib.

Controller

Switch

Rib

Sponge sheet

Pass Controller’s Lead wires (black, red) through Sponge sheet.

Pass Controller’s Lead wires

(white, red) by the Rib.

Do not pinch Controller’s lead wires (white, red)

between Switch and inner wall of Handle set.

Wiring in Handle complete (L)

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