Makita AN250HC Technical Information page 6

R
epair
[4] DISASSEMBLY/ASSEMBLY
[4]-3. Trigger valve section
DISASSEMBLING
Note: Trigger valve section can be replaced without removing Magazine section and Driver guide from Housing set.
(1) Remove Contact arm and Holder as illustrated in Fig. 9.
Fig. 9
Remove Contact arm cover by unscrewing
M5x20 Hex socket head bolt.
Contact arm cover
M5x20 Hex
socket head bolt
(2) Trigger valve section can be disassembled as illustrated in Figs. 10 and 11.
Fig.10
Remove the following Spring pins
with 1R268.
Spring pin 3-20
Spring pin 3-32
(For securing Trigger
assembly)
(For securing Trigger valve case)
Fig. 11
Separate Trigger valve case from Trigger valve
guide using slotted screwdriver.
Pilot valve
Trigger valve guide
slotted screwdriver
O ring 3 and two O-rings 3 can be replaced.
Note: O ring 3 is different from two O-rings 3.
They have to be mounted to Trigger valve
stem as illustrated right.
Separate Contact arm from Slide
plate after removing Urethane
ring 3 using slotted screwdriver.
Contact arm
Urethane ring 3
Remove Trigger assembly and
Change rod from Housing set.
Trigger valve guide
O-ring 15
Trigger valve stem
Trigger valve case
2.5mm
slotted
screwdriver
Contact arm
Slide plate of
Adjuster assembly
Pull off Trigger valve stem with pliers.
Trigger valve section can be removed
from Housing set.
Trigger
assembly
Adjuster
Pliers
assy
Change rod
O ring 18
O-ring 7
O-ring 12.5
(2pcs.)
Compression
Pilot valve
spring 4
O ring 3 Trigger valve stem
Remove Holder by unscrewing
M5x12 Hex socket head bolt.
M5x12 Hex
socket head bolt
Adjuster assembly
Trigger valve
stem
Trigger valve section
Trigger valve stem
Trigger valve case
3.0mm
O-ring 3
P 6/14
Holder