Makita MAKSTAR BTW250 Series Technical Information page 4

R
epair
[3] -1. Disassembling/Assembling Hammering Mechanism (cont.)
6) Install 1R346 on 1R045. (Fig. 5)
7) Set 1R045 on Hammering mechanism (= assembled unit of Hammer, Spindle,
Spur gears, Steel balls, etc.) as illustrated in Fig. 6.
Then turn the handle of 1R045 clockwise to lower Hammer to the full.
8) Align the notch in Hammer with the top of Cam groove on Spindle.
Then take two 5.6 Steel balls out of spindle using tweezers or a slotted
screwdriver magnetized using 1R288. (Fig. 7)
Fig. 6
Spindle
9) Remove 1R045 by turning the handle counterclockwise.
10) Remove Spindle, Compression spring 25 and Cup washer 14 from Hammer as illustrated in Fig. 8.
Important: Be sure to lower the Hammer side in order to prevent Steel balls in Hammer from scattering around.
11) Now Steel ball 3.5 can removed from Hammer. (There are twenty-four 3.5 Steel balls in the groove on the inside
of Hammer.)
Note: As illustrated in Fig. 9, the groove of Hammer is designed to have a space equivalent to about one 3.5
Steel ball when twenty-four 3.5 Steel balls are set in place.
Fig. 8
Hammer
Fig. 7
Hammer
1R346
1R045
Fig. 9
Hammer
Steel ball 3.5
(24 pcs)
Fig. 5
1R045
Steel ball 5.6
notch in Hammer
top of Cam groove on Spindle
space equivalent to
about one 3.5 Steel ball
P 4 / 8
1R346