Makita GA7020R Technical Information page 4

R
epair
[4] DISASSEMBLY/ASSEMBLY
[4]-1. Armature, Small spiral bevel gear, Ball bearing 6301DDW (cont.)
DISASSEMBLING
(3) Disassemble Armature as illustrated in Fig. 6.
Fig. 6
Remove M8 Hex nut and small Spiral bevel gear again.
Ball bearing 6301DDW can be removed by hand.
Small spiral bevel gear
M8 Hex nut
ASSEMBLING
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.
Fig. 7
Felt top portion
Steel cup portion
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.
Ball bearing 6301DDW
1R252
Felt ring 18
Bottom step in Gear housing complete
V-block
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.
Remove Ball bearing 6200DDW with 1R269.
Ball bearing 6200DDW
Flat washer as a jig
28mm in outer
diameter
0.5mm in
thickness
Cross-section of the bottom
of the bearing room
Flat washer
P 4/ 9
1R269
1R252 Rubber ring 38
0.5mm
Felt ring 18