Makita GA7020S Technical Information

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Repair
[2] LUBRICATION
Put approx. 60g of Makita grease SG No.1 in the gear room of Gear housing complete to protect parts and product from
unusual abrasion.
[3] DISASSEMBLY/ASSEMBLY
[1] NECESSARY REPAIRING TOOLS
CAUTION: Remove the wheel from the machine for safety before repair/ maintenance !
Model No. No load speed: min-1
GA7020
GA7020S
8,500
6,600
(USA, Guam: 6,000)
Spiral bevel gear 16 Spiral bevel gear 53B
Spiral bevel gear 53ASpiral bevel gear 12
GA9020
GA9020S
GA7021
Small spiral bevel gear
(Gear on Armature shaft)
Large spiral bevel gear
(Gear on Spindle)
Number of teeth: 16
Number of teeth: 12
Number of teeth: 53
Number of teeth: 53
1R048 Drill chuck remover 11 Removing Spiral bevel gear 53
1R049 Drill chuck remover 15 Removing Spiral bevel gear 53
1R269 Bearing extractor Removing Ball bearings
1R005 Retaining ring R pliers Removal/installation of Retaining ring R-42
Assembling Spiral bevel gear 53 1R165 Ring spring setting tool B
Code No. Description Use for
grooved
not grooved
[3] -1. Armature, Small spiral bevel gear, Ball bearing 6301DDW
Fig. 2
DISASSEMBLING
Fig. 1
Hex nut M8
1) After removing Carbon brush, separate the assembly of Gear housing complete with Armature from Motor housing
complete by unscrewing four M5x35 Tapping screws.
2) Separate Bearing box from Gear housing complete by unscrewing four M6x22 Hex socket head bolts.
3) With Armature securely held by hand, remove Hex nut M8 from the drive-end of Armature shaft by turning
counterclockwise with wrench 13. (Fig. 1)
4) Hold Small spiral bevel gear by hand, then pull off Armature from Gear housing complete. (Fig. 2)
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 cloth to protect the gear teeth.
3. Using water pump pliers or the like, firmly grip the gear wrapped with cloth, then turn the gear.
Gear housing complete,
viewed from the wheel
installation side
Small spiral bevel gear
Important: As listed below, different gears are used for GA7020/GA7020S and GA9020/GA9020S/GA7021,
and they are not interchangeable between the models. Be careful not to confuse them.

Makita GA7020S Specifications

General

Brand	Makita
Model	GA7020S
Category	Grinder
Language	English