Crank Housing; Fig. 9 - Makita HM1205C Technical Information

R
epair
[3] ASSEMBLY/ DISASSEMBLY
[3] -2. Impact bolt, Cylinder, Striker
DISASSEMBLING
(1) Impact bolt can be disassembled as drawn in Fig. 7.
Fig. 7
1. Remove four M8x35 Hex socket head bolts with 1R231
and M5x25 Hex socket head bolt with 1R229.
Housing cover and Barrel section can be separated from
Crank housing without disassembling Chuck mechanism.
M8x35 Hex
socket head
bolt (4pcs.)
M5x25 Hex
socket head
bolt
(2) If Fluoride ring 28 is worn, O ring 23 (orange) appears. In this case,
replace all the rings (X ring 21, Fluoride ring 28 and O ring 23) with new ones.
(3) Disassemble Cylinder 40 from Crank housing, and take out Striker from Cylinder 40 as drawn in Fig. 9.

Fig. 9

1. Tap Crank housing as shown below to remove
Cylinder 40 from Crank housing.

Crank housing

Housing cover
Barrel section
Crank housing
Cylinder 40
2. Insert a screwdriver and tap Impact bolt
with the screwdriver to remove Impact bolt,
two Shoulder sleeves and Rubber ring 24.
Screwdriver
Tool holder cap
Impact bolt
Shoulder
sleeve
Fig. 8
X ring 21
Fluoride ring 28
O ring 23
Impact bolt
2. Remove Striker from Cylinder 40. Then,
O ring 31.5 can be removed from Striker.
Cylinder 40
O ring 31.5
Striker
P 6/ 17
Rubber
ring 24