P 2/ 12
Repair
Apply Makita grease to the following portions designated with the black triangle and gray triangle to protect parts and
product from unusual abrasion.
[1] NECESSARY REPAIRING TOOLS
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
Code No. Description Use for
1R045 Gear extractor (Large) separate Armature from Gear housing cover
1R049 Drill chuck remover 15
fixing large Spiral bevel gear when removing Spindle
1R050 Drill chuck remover 22
1R232 Pipe 30 removing Cup ring and Ball bearing 6903ZZ from large Spiral bevel gear
1R258 V block supporting Bearing box
1R268 Spring pin extractor M3 disassembling Shaft lock mechanism
1R269 Bearing extractor removing Ball bearings 627DDW/ 696ZZ from Armature
1R281 Round bar for Arbor 7-50 removing Switch knob from Switch lever
1R286 Round bar for Arbor 12-50 removing large Spiral bevel gear section from Bearing box
1R291 Retaining ring S & R pliers removing Retaining ring S-9
1R340 Bearing retainer wrench removing Bearing retainer 20-33 from Bearing box
1R350 Ring 60 supporting Gear housing when disassembling Shaft lock mechanism
[2] LUBRICATION
Fig. 1
Item No. Description
Gear housing
C-type plate
Lubricant AmountPortion to lubricate
Coupling
Spindle
Model No.
GA4040 GA4540C
GA4540 GA5040C
GA5040 GA4542C
GA4040C GA5042C
GA6040 GA6042C
GA6040C
Smaller spiral bevel gear
(on armature shaft)
Larger spiral bevel gear
(on spindle)
10 teeth 38 teeth
9 teeth 41 teeth
Gear room 15 g
a little
a little
a little
70
56
1
Joint sleeve
Note: As listed below, the grinders use different spiral bevel gears, and they are not interchangeable.
Referring to this list, therefore, be sure to use correct gears for replacement.
Spiral bevel gear (large)
Ball bearing 6903ZZ
56
58
58
Outer surface where 58 Coupling contacts
Drum portion where 58 Coupling contacts
Cylindrical portion where 56 C-type plate contacts
Makita Grease FA No. 2:
Makita Grease FA No. 2:
Makita Grease FA No. 2:
Makita Grease SG No. 0:
1
70
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Note in Disassemble (general)
No load
speed: min.ˉ¹
11,000
9,000
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