Makita HM1801 Technical Information page 8

R
epair
[3] DISASSEMBLY/ASSEMBLY
[3] -3. Disassembling/Assembling Barrel Section
DISASSEMBLING
1) Remove Barrel from Crank housing complete by unscrewing four M12x55 Hex socket head bolts.
Then remove Cylinder liner 62. (Fig. 19)
Note: Use an appropriate steel pipe to extend the grip of hex wrench for easy removal of the bolts securely fastened
with adhesive.
2) Take out Striker from Cylinder liner 62, then remove O ring 52 from Striker. (Fig. 19)
3) Take out Piston and Connecting rod from Crank housing complete, and remove O ring 52 and O ring 55 from the
removed Piston. (Fig. 19)
Fig. 19
Steel pipe
Barrel
Striker O ring 52
ASSEMBLING
Do the reverse of the disassembling steps.
Note:
Striker and Spacer are not reversible when assembled to Cylinder liner 62. Be sure to install as illustrated in Fig. 20.
Fig. 20
CORRECT
WRONG
Do not forget to put Flat washer 63 between Cylinder
liner 62 and Crank housing complete.
When assembling Barrel to Crank housing complete,
first fit Pin 5 in the hole on Barrel, and put the pin
through the hole of Gasket.
Then fit Barrel to Crank housing complete so that
Pin 5 is inserted into the hole on Crank housing
complete. (Fig. 21)
Cylinder liner 62 Spacer
Flat washer 63
Spacer
Striker
[Cross section]
Piston
Piston and Connecting Rod
O ring 52 O ring 55
Cylinder liner 62
Fig. 21
Barrel Gasket
Pin 5
P 8 / 18
Crank housing comp.
Crank housing complete