Makita MakStar BFT120F Technical Information page 6

R
epair
< 6 > Disassembling gear assembly
( 1 ) After removing bit holder section, remove spring holder section (front cover, spring holder A, thin washer 30,
compression spring 30, thin washer 24 and torque plate).
1. Take off front cover, and remove spring holder A by turning it anti-clockwise. See Fig. 11.
2. Then, the following parts can be separated from gear case complete. See Fig. 11.
* Thin washer 30
* Compression spring 30
Fig. 11
Front cover
Spring holder A
Thin washer 30
( 2 ) Remove lock washer by turning it with small screwdriver anti-clockwise. See Fig. 12.
( 3 ) Remove 3 pcs. of spur gears 31 and spur gear 10 complete. And then, remove internal gear case
by unscrewing 4 pcs. of tapping screws 3x12. See Fig. 12.
( 4 ) Remove flat washer 18, 38 pcs. of steel balls 3, spur gears 17 and carrier complete A.
Remove inner gear 46, clutch ring and 3 pcs.of steel balls 4. See Fig. 13.
( 5 ) Take off retaining ring S-12. Then, 2 pcs. of flat washers 12 and 16 pcs. of steel ball 3 can be removed from
spindle. See Fig. 14.
Fig. 13
Carrier
complete A
Spur gears 17
Flat washer 18
<Note>
After removing, make sure, whether 38 pcs of steel balls 3
are remain, or not.
* Thin washer 24
* Torque plate
Gear case complete
Compression
spring 30
Thin washer 24
Lock washer
Spur gear 10
complete
38 pcs. of
Steel balls 3
Clutch ring
Inner gear 46
Torque plate
Fig. 12
Spur gears 31
Tapping
screws 3x12
3 pcs. of
Steel balls 4
Retaining
ring S-12
< Note >
After removing, make sure, whether 16 pcs of
steel balls 3 are remain, or not.
Internal gear case
Fig. 14
2 pcs. of flat
washers 12
16 pcs. of steel balls 3
P 6 / 12