Makita HR4040C Technical Information page 6

(3) Replacement of armature
1. Remove tool holder by sliding down
sleeve 46.
And then the sleeve 46 can be removed
from the machine. (see Fig. 4)
Remove chuck cover by hitting its edge
with plastic hammer slightly. (see Fig.5)
2. Remove compression spring 50 after
removing retaining ring S-50.
And then remove crank housing cover
after taking off pan head screw. (see Fig. 4)
3. Remove handle. (see Fig.6)
< Note >
The upper 2 screws are different
from other 4 screws.
Be careful in assembling / disassembling.
The upper 2 screws : Pan Head Screw M5x20
The other 4 screws : Tapping Screw 5x20
4. Separate terminal (black and white) below
from the controller. (see Fig. 6)
5. Remove pick up coil after taking off
fix rod. (see Fig.8 at the next page)
< Note >
Pull lead wire not so strong. Otherwise it
causes the breakage of lead wire.
6. Remove controller after separating 3 terminals
(black, white and red) from controller. (see Fig. 7)
Tool holder cap
Sleeve 46
Chuck cover
Pan Hd. Screw for
fastening crank
housing cover
complete
Crank housing
cover complete
Controller
Terminal
Controller
Black
Fig. 4
Edge of chuck cover
Plastic hammer
Black
Fig. 6
White
White
Red
Fig. 7
Fig. 5