Makita MAKSTAR BTW250 Series Technical Information page 5

R
epair
[3] -1. Disassembling/Assembling Hammering Mechanism (cont.)
ASSEMBLING
Do the reverse of assembling steps.
Note:
1) Assemble by piling up component parts on Bearing box complete as illustrated in Fig. 10.
2) Make sure that twenty-four 3.5 Steel balls are in place inside Hammer.
3) Make sure that O ring 40 is assembled to Bearing box complete before assembling Internal gear 51. (Fig. 11)
4) Internal gear 51 is not reversible when assembled to Bearing box complete. Make sure that the stepped end of
Internal gear 51 is positioned on the Bearing box complete side. (Fig. 11)
5) Assemble Hammer case complete to Bearing box as illustrated in Fig. 12.
Fig. 10
Fig. 12
Fit Hammer case complete over Internal gear 51
while aligning the four grooves on the inside of
Hammer case complete with the corresponding
projections on Internal gear 51.
134848-9
Bearing box complete
Hammer case complete
Hammering mechanism
Internal gear 51
O ring 40
Bearing box complete
Hammer case complete
four grooves on
the inside surface
Internal gear 51
four projections
Fig. 11
stepped end
O ring 40
Fasten Hammer case complete to Bearing box
complete to the recommended torque of
30 - 40 N.m by turning counterclockwise
using 1R224 and No.1R223,
P 5 / 8
Internal gear 51
Bearing box complete