Makita GA7050 Technical Information page 4

R
epair
[3] DISASSEMBLY/ASSEMBLY
[3]-1. Armature, Spiral bevel gear (small), Ball bearing 6201DDW, Ball bearing 6000DDW (cont.)
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.
Fig. 7
Felt top
portion
Steel cup
portion
1R258 (1set/2pcs.)
Hold Gear housing complete with two V-blocks,
and pressfit Felt ring 16 into the hole of Gear
housing complete so that the felt top portion and
the bottom step of Gear housing complete is in line.
(2) 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)
(3) Assemble Armature and small Spiral bevel gear to Gear housing complete by reversing the step shown in Fig. 3.
(4) Assemble Gear housing complete to Motor housing, And assemble Bearing box section to Gear housing complete.
Fig. 8
Armature with Ball
bearing 6201DDW
1R252
Felt ring 16
Bottom step in Gear housing complete
Armature
Ball bearing
6201DDW
Flat washer as a jig
26mm in outer diameter
0.5mm in
thickness
Cross-section of the bottom
of the bearing room
Flat washer
as a jig
Put a Flat washer (illustrated above) temporarily on Felt ring 16.
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 16 in place.
1R005
Retaining
ring R-32
Note: If O ring 31 has damage,
replacing it is required.
1R252
O ring 31 in Gear housing
complete
0.5mm
Felt ring 16
P 4/ 8
Groove for
Retaining
ring (INT)
R-32