Repair Angle Grinders Makita GA7050/ GA9050

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Repair Angle Grinders Makita GA7050/ GA9050

 

 

1. NECESSARY REPAIRING TOOLS

 

 

2. LUBRICATIONS

 

Apply Makita grease SG.No.0 to the following portions designated with the black triangle to protect parts and product from unusual abrasion.

 

 

3. DISASSEMBLY/ASSEMBLY

 

Armature, Spiral bevel gear (small), Ball bearing 6201DDW, ball Bearing 6000DDW

 

Each model has different gears as illustrated below, and they are not interchangeable.

 

DISASSEMBLING

 

Disassemble Armature assembly and Small spiral bevel gear as illustrated in Figs. 2 and 3.

 

 

Note: If the work is very difficult due to the seizing of Small spiral bevel gear, spray 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.

 

 

Disassemble Ball bearing 6201DDW as illustrated in Figs. 4 and 5.

 

 

Disassemble Armature section as illustrated in Fig. 6.

 

 

ASSEMBLING

 

Assemble Gear housing section by setting Felt ring 16, Ball bearing 6201DDW and Retaining ring (INT) R-32 in place of Gear housing complete in accordance with the following steps.

(1) Set Felt ring 16 in place as illustrated in Fig. 7 when disassembling Ball bearing 6201DDW.

 

 

Assemble Ball bearing 6201DDW to Armature temporarily. After setting Ball bearing 6201DDW in place of Gear housing complete, pull off Armature. Then, fit Retaining ring (INT) R-32 into the groove of Gear housing complete to secure Ball bearing 6201DDW. (Fig. 8)

 

Assemble Armature and small Spiral bevel gear to Gear housing complete by reversing the step shown in Fig. 3.

 

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

 

 

DISASSEMBLING

 

Large spiral bevel gear can be disassembled as illustrated in Figs. 9, 10R and 11.

 

 

Ball bearing 6202DDW can be disassembled as illustrated in Fig. 12A or Fig. 12B.

 

 

ASSEMBLING

 

Reverse the disassembling step shown in Fig. 11, 10R and 9.

 

Note: 1) Do not deform the labyrinth ring of Spindle complete when pressfitting Spindle complete to Ball bearing 6202DDW. (Fig. 13)

 

Putting Large spiral bevel gear on 1R165, press Spindle into arbor hole of Large spiral bevel gear with Arbor press. (Fig. 14)

 

 

Shaft lock mechanism DISASSEMBLING

 

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. 15 and 16.

 

 

ASSEMBLING

 

1) Be sure to use a new Pin cap for replacement and to remove all the plastic dust on Shoulder pin 11. (Fig. 17)

2) Assemble the parts for Shaft lock mechanism as illustrated in Fig. 18.

 

 

Circuit diagram

 

 

Wiring diagram