Makita BTM40 Technical Information page 5

R
epair
[3] DISASSEMBLY/ASSEMBLY
[3] -2. Bearing Box Section and Crank Housing Section
DISASSEMBLING
(1) Disassemble Crank housing complete from Motor housing. (Fig. 3)
(2) Remove Bearing box section from Crank housing complete, then remove Crank shaft from Bearing box. (Fig. 6)
Note:
1. No need to remove Battery housings (R) and (L) and Handle cover.
2. You must replace Crank housing complete as a unit, because it is a
factory-assembled part and cannot be disassembled.
Fig. 6
1. Remove O ring 8 from Crank shaft, then remove Bearing retainer
by unscrewing three M4x12 Hex socket head bolts.
Crank housing section
O Ring 8
Crank shaft
3. Remove Retaining ring S-7 from Crank shaft with 1R291,
then remove Crank section from Bearing box using
arbor press and 1R232.
1R291
Retaining
ring S-7
Bearing box
ASSEMBLING
Bearing box section can be assembled by reversing
the disassembly procedure. (Fig. 6)
Note in Assembling:
Do not forget to mount O ring 8 onto Crank shaft.
(Fig. 7)
2. Insert the tips of 1R003 into the pin holes
M4x12 Hex socket
head bolt (3 pcs.)
Bearing retainer
Crank housing
complete
4. From Crank shaft, remove Sphere bearing 706,
then remove Ball bearing 6000DDW with 1R269.
Sphere bearing 706
Crank section
Crank shaft
Ball bearing 6000DDW
1R232
Crank shaft
Fig. 7
O ring 8
of Bearing box, then pull out Bearing box
from Crank housing complete while
turning it with 1R003.
1R269
P 5/ 10
1R003
Bearing box