Makita AN450H Manual

Models No.
Description
PRODUCT
TECHNICAL INFORMATION
CONCEPT AND MAIN APPLICATIONS
P 1/ 16
AN450H
Pneumatic Roofing Coil Nailer
Model AN450H is a pneumatic nailer powered by high pressure air;
designed for roofing shingles - especially for roofing asphalt shingles.
Drives the same wire collated coil nails as used for our normal pressure
air model AN453.
Its main benefits are:
Compact and lightweight design for high maneuverability
Nailing mode selector for providing Bump-fire*1or
Sequential*2capabilities. Dimensions: mm (")
Width 2 (W2)
Height (H)
Length (L) 287 (11-1/4)
142 (5-5/8)Width 1 (W1)
Width 1: with Hook
Width 2: without Hook
117 (4-5/8)
276 (10-7/8)
L
H
W2 W1
Specification
Standard equipment
Optional accessories
Note: The standard equipment for the tool shown above may vary by country.
Hook ................................................................. 1
Safety goggles ................................................... 1
Oil supply (containing 30ml of turbine oil) ...... 1
Hex wrench 4 ................................................... 1
Plastic carrying case ......................................... 1
Air leak repair set
Coil nails
Air hose, etc.
Nails per coil 120 nails
Net weight: kg (lbs)
Magazine capacity
Nail
Operating air pressure: MPa
(kgf/cm2)
[PSI]
2.2 (4.8)
120 nails
1.28 - 2.26
(13 - 23)
[180 - 320]
19, 22, 25, 32, 38, 45
(3/4, 7/8, 1, 1-1/4, 1-1/2, 1-3/4)
Wire collated coil nail
Nail length: mm (")
Nail type
*1: Nails can be fired one after the other continuously first by pulling Trigger
then by bumping Contact arm against workpiece with the Trigger pulled.
*2: One nail is fired first by pushing Contact arm against workpiece, then by
pulling Trigger with the Contact arm kept pushed; nail cannot be fired when
the steps are reversed. Another one can be fired by releasing Trigger,
then by repeating the steps; however, cannot be fired if Trigger is not released
before repetition of the steps.

P 2/ 16
Repair
[1] NECESSARY REPAIRING TOOLS
[2] LUBRICATIONS
Code No.
1R266 Spring pin extractor 2
1R268 Spring pin extractor 3
1R229 1/4” Hex shank bit for M5
1R230 1/4” Hex shank bit for M6
1R247 Round bar for arbor 20-100
1R291 Retaining ring S and R pliers
1R308 Spring pin extractor 4
Disassembling / Assembling Trigger section and Adjuster section
Disassembling / Assembling Trigger base and Trigger valve
Loosening M5 hex socket head bolt
Loosening M6 Hex socket head bolt
Installing Rear cushion
Disassembling / Assembling Retaining ring R-24
Removing Rear cushion from Top cap
Description Use for
Apply a little amount of Isoflex NB52 to O rings and Rubber ring illustrated below to protect parts and
product from unusual abrasion.
Fig. 1 Item No. Description
Trigger valve section
Q’ty
9
12
16
22
23
25
32
34
41
85
88
O ring 50
O ring 42
O-ring 17
O ring 40
O ring 28
O ring 5
O ring 18
O-ring 7
O-ring 12.5
O ring 3
O-ring 3
O ring 18
O-ring 38
O-ring 4
O ring 36
O ring 9
O ring 14
1
2
1
1
1
1
1
1
1
1
1
101
103
105
107
109
110
1
2
1
1
2
1
CAUTION: Disconnect air hose and remove all nails from the machine for safety before
repair/ maintenance in accordance with the instruction manual!
O-ring 15
100 1
90 Rubber ring 16 1
10 O-ring 30 1
25
10
22
41
32
12
9
34
16
23
107
105
100
101
110
103
109
88
85
90
Note: O ring 3 is different from O-ring 3.
Distinguish them by their parts
numbers.

[3] Fastening Torque and Adhesive for Bolts
Fig. 2
Item No. Description
Exhaust cover cap
Top cap
Magazine
Magazine cap complete
Door
Single guide
42
44
36
36
99
11 3.0 - 5.0
7.5 - 8.5
13.0 - 15.0
20.0 - 30.0
20.0 - 30.0
2.0 - 3.0
2.0 - 3.0
4
*M5 Hex socket button head bolt
*M5x35 Hex socket head bolt
*M6x25 Hex bolt
*Inlet cap
One Touch Joint H22PM
5
36
42
44
Fastening torque: N.m
Q’ty Use for
Housing set
Driver guide complete
fastening Top cap to Housing set
4fastening Driver guide complete to Housing set
fastening Magazine cap complete to Door
fastening Magazine to Driver guide complete
fastening Exhaust cover cap to Top cap
1 installing the left handed thread to Housing set
1
2
1
installing the left handed thread to 42 Inlet cap
2.0 - 3.0
M5x20 Hex socket head bolt
99 1 fastening Magazine lock to Magazine
Refer to Fig. 2.
Tighten the bolts to the specific fastening torque.
*Apply Loctite 242 or ThreeBond 1321/ 1342 to the threads of bolts designated with hexagonal marks.
Driver guide complete 53
59
53
59
*M5x12 Hex socket head bolt
*M5x25 Hex socket head bolt
P 3/ 16
Repair
Note: Bind a thread sealant tape to the
thread of One touch joint H22MP
to maintain the positive sealing on
the threaded connection.
Magazine
lock
5
1
5

[4] DISASSEMBLY/ASSEMBLY
[4]-1. Head valve section
DISASSEMBLING
Fig. 3
Fig. 4
M5x35 Hex socket
head bolt (4pcs.)
M5 Hex socket button head bolt
Disassemble Head valve section as illustrated in Figs. 3 and 4.
Top cap
Top cap
Top cap
Exhaust cover cap
Disassemble Head valve section from Housing set
by removing M5 Hex socket button head bolt and
M5x35 Hex socket head bolt (4pcs.).
Head valve and Rear cushion remain in Top cap in
this step.
Head valve
While holding Head valve by hand,
blow the air into Top cap with air duster.
Head valve and Rear cushion can be lifted
from Top cap.
air duster
Exhaust cover
Filter
Top cap gasket
Housing set
Rear housing
guard (2pcs.)
Rear cushion
Flat washer 26
Rear cushion can be completely
removed by pushing with 1R308
through the hole of Top cap.
Head valve section
1R308
Remove Head valve by
turning by hand.
If removing is difficult,
lever up Head valve with
slotted screwdriver.
Head valve
slotted screwdriver
ASSEMBLING
Compression
spring 4 (8pcs.)
Head valve
(1) Assemble Head valve section as illustrated in Fig. 5.
(2) Mount the Head valve section to Housing set. Refer to Fig. 3.
1R247 arbor
press
Assemble Head valve to Top cap carefully
so that Compression spring 4 (8pcs.) does
not fall.
Mount Flat washer 26 to
Rear cushion.
And put Rear cushion on
the center of Top cap.
Finally set Rear cushion in
place in Top cap with 1R247
and arbor press.
Flat washer 26
Rear cushion
Fig. 5
P 4/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-2. Driver complete, Cylinder section
DISASSEMBLING
Fig. 6
Fig. 7
Fig. 8
(1) Disassemble Head valve section from Housing set as illustrated in Fig. 3.
(2) Remove Cylinder section and Driver complete from Housing set, and disassemble them as illustrated in
Figs. 6 and 7.
Remove O ring 5 to prevent being lost. Remove the components of Cylinder section with Driver complete
by Striking the edge of Housing set,
O ring 5
Valve seat
Cylinder stay
Valve seat
Cylinder stay
Valve seat
Cylinder stay
Remove Cylinder stay with Valve seat from Cylinder. Remove Valve seat from Cylinder stay.
Cylinder
Cylinder
Housing set
Driver complete
(3) O- ring 17, O ring 28 and O ring 40 can be removed as illustrated in Fig. 8.
Fig. 9
Cylinder
Driver completeO-ring17 O ring 28 O ring 40
Assemble Cylinder section as illustrated in Fig. 9.
Note: Set O ring 5 in place before assembling Head valve section to Housing set.
Refer to the left illustration in Fig. 6.
ASSEMBLING
Valve seat
Cylinder
stay
Cylinder
Top cap
Assemble Valve seat to Cylinder stay. And setting Cylinder stay to Cylinder,
press the Cylinder toward Top cap.
Cylinder stay can be assembled to Cylinder at the position as it is.
Cylinder stay and Valve seat
have to be assembled to
Cylinder properly.
P 5/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-3. Driver complete, Cylinder section (cont.)
ASSEMBLING
(2) Mount O rings to Cylinder and Driver complete. Refer to Fig. 8.
(3) Assemble the Cylinder section to Housing set. Refer to the right illustration in Fig. 6.
(4) Insert Driver complete into the Cylinder. Refer to the right illustration in Fig. 6..
(5) Assemble O ring 5 to Housing set. Refer to the left illustration in Fig. 6.
(6) Assemble the Head valve section to Housing set. Refer to Fig. 3.
[4]-4. Magazine
DISASSEMBLING
Magazine guard
Magazine guard
Change plate
Change plate
Magazine
M5x25 Hex socket head bolt (2pcs.)
Refer to Figs. 10 to 12.
Remove Magazine and Single guide
from the machine by removing
M5x25 Hex socket head bolt (2pcs.).
Remove Magazine guard
by removing M4x8 Pan
head screw.
Press Change plate until it is attached on the bottom of Magazine.
Single guide
M4x8 Pan head screw
Magazine
Magazine
Magazine
Holder cap
Holder cap
awl
Insert awl into the notch on the bottom
of Magazine and lever up Holder cap.
Pick up Holder cap by finger, then remove
the hook of Tension spring 5 from the
hole on the reverse side of Holder cap
using awl.
Fig. 10 Fig. 11
Fig. 12
Tension spring 5
Holder cap (on change plate)
Tension spring 5
Rubber plate 6-20
Holder cap (on the bottom
of Magazine)
Magazine section can be
disassembled as illustrated right.
P 6/ 16
Repair
notch on the bottom of Magazine

[4] DISASSEMBLY/ASSEMBLY
[4]-4. Magazine (cont.)
ASSEMBLING
Rubber
plate 6-20
Tension
spring 5
Holder cap
(1) Assemble Magazine as illustrated in Fig. 13.
(2) Mount Magazine to the Machine, referring to Fig. 10.
Press Change plate until it
is attached the bottom of
Magazine.
Insert Rubber plate 6-20 into Tension
spring 5. Then assemble Top cap to
Tension spring 5.
Put Holder cap to Change plate while
passing Tension spring 5 through the
center hole of Change plate.
Pull out the Tension spring 5 from
the bottom side of Magazine.
Connect Holder cap with the
hook of Tension spring 5.
Change plate
Holder cap
Holder cap
M4x8 Pan head screw
Assemble Magazine guard
to Magazine.
Magazine guard
Magazine
Fig. 13
P 7/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-5 Magazine cap complete
DISASSEMBLING
DISASSEMBLING
ASSEMBLING
M5x12 Hex
Socket head
bolt (2pcs.)
M5x12 Hex
socket head
bolt
M5x12 Hex Socket head bolt
(shown below) is screwed into
the hole of Lock pin.
Therefore, clamp Lock pin with
vise then remove M5x12 Hex
socket head bolt.
Remove Magazine cap by unscrewing
M5x12 Hex socket head bolt (2pcs.).
Lock lever, Lock pin, etc. still remain
on Magazine cap complete in this step.
Magazine cap complete
Refer to Fig. 14.
Refer to Fig. 15.
Take the disassembling step in reverse.
Compression
spring 6
Lock pin
Lock lever
Magazine cap complete
Remove the other components as
illustrated below.
Lock pin
Lock lever Lock lever Flat washer 6
Lock pin
Magazine cap complete
Fig. 14
Fig. 15
[4]-6 Check claw
Check claw that is held to the inside of Door
with Pin 4 is removed.
Push Pin 4 toward Housing set with slotted screwdriver,
and pull off it with pliers.
Note: Do not lose Urethane ring 3 for holding Pin 4 in Door.
Door
Door
Check claw with
compression spring 4
P 8/ 16
Repair
pliers
Door
Urethane ring 3slotted screwdriver
Pin 4 Pin 4

[4] DISASSEMBLY/ASSEMBLY
[4]-7 Front cushion, Trigger valve
DISASSEMBLING
Fig. 15
Fig. 16
(1) Separate Magazine section from machine as illustrated in Fig. 10.
(2) Remove Magazine cap complete as the left illustration in Fig. 14.
(3) Front cushion can be replaced in the order of Figs. 15 and 16. Driver complete can be replaced in this step
as the right illustration in Fig. 16.
Viewed from Magazine side
Trigger
Contact arm
Urethane
ring 3
Remove Urethane ring 3.
Contact arm can be removed
together with Contact top.
Contact top
Housing set
Cylinder guide, Front
cushion, O ring 40 and
O ring 4 can be replaced.
Cylinder guide
Driver guide complete
Front cushion
O ring 40 O ring 4
M6x25 Hex socket
head bolt
M6x25 Hex socket
head bolt
Driver complete can be pulled
out from Driver guide complete
side.
Driver complete
P 9/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-7 Front cushion, Trigger valve (cont.)
DISASSEMBLING
Spring pin 3-20
Spring pin 3-30
Spring pin 3-32
Trigger
valve stem
Trigger valve section
Trigger base
section
Adjuster
assembly
Change rod
Disassemble Trigger
base section and Change
rod from Housing set.
Remove the following Spring pins
with 1R268.
Pull off Trigger valve stem with pliers.
Trigger valve section can be removed
from Housing set.
Pilot valve
Trigger valve
guide
Trigger valve
case
Separate Trigger valve case
from Trigger valve guide.
Trigger valve guide
Trigger valve stem
Pilot
valve
Trigger valve stem
Trigger valve stem
Compression
spring 4
O ring 15 O ring 12.5O ring 7
(2pcs.)
Trigger valve case
2.5mm 3.0mm
Pay attention that O ring 3 is different from O-ring 3 (2pcs.).
Distinguish them by their parts numbers and do not mistake each
position when assembling.
O ring 3 O-ring 3
O ring 18
Fig. 17
Fig. 18
(4) Trigger valve section can be disassembled in the order of Figs. 17 and 18.
P 10/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-7 Front cushion, Trigger valve (cont.)
ASSEMBLING
Take the disassembling step in reverse. Refer to Figs. 18 and 17.
Trigger valve
guide
Note: 1) When assembling Trigger valve guide to Trigger valve case, press Trigger valve guide to Trigger valve case
until it snaps. (Fig. 19)
2) Fitting Lever to the groove of center of Change rod, assemble Trigger base section. (Fig. 20)
3) Pay attention to the assemble position of Spring pins 3-20 and 3-32. Refer to the left illustration in Fig. 17.
4) Use 1R268 as a guide jig for easy and exact assembly of Spring pins. (Fig. 21)
Fig. 19 Fig. 20
Fig. 21
Trigger
valve case
Trigger base
section
Change rod Lever
Spring pin
1R268
(as a guide jig)
In order to use 1R268 as a guide jig,
insert it to Housing set.
And fit Spring pin’s hole to the protrusion
of 1R268.
Strike Spring pin until !R268
is pushed out from Housing set.
1R268
(as a guide jig)
Spring pin
P 11/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-8 Trigger base section
DISASSEMBLING
ASSEMBLING
(1) Disassemble Trigger base section as per the left and center illustrations in Fig. 17.
(2) The removed Trigger base section are disassembled as illustrated in Fig. 22.
Pin 3 as an axis for Trigger
Lever for Sequential firing
Lever for
Single firing
Pin 3 as an axis for
Stopper plate and Lever
Spring pin 2-12
Spring pin 2-12
Trigger base
Stopper plate
Remove 2 pcs. of Pin 3.
Trigger base section are dissembled as
illustrated right.
Torsion
spring 5
Torsion spring 4
Torsion spring 4
Torsion spring 6
Pin 3 as an axis for
Trigger
Pin 3 as an axis for
Stopper plate and Lever
Trip Lever
Fig. 22
Mount Torsion spring 4 to Lever (for Sequential firing) and assemble them to Trigger base together
with Trigger.
Pass Pin 3 through Trigger, Torsion spring 4 and Lever (for Sequential firing) as illustrated above.
Lever for
sequential firing
Torsion
spring 4
Fig. 23
Trigger
Pin 3 as an axis for
Trigger
(1) Assemble Trigger and Lever for sequential firing to Trigger base as illustrated in Fig.23.
P 12/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-8 Trigger base section (cont.)
ASSEMBLING
Torsion spring 6
wide hook
Torsion spring 6
Torsion spring 6
Hitch Stopper plate with the narrow
hook of Torsion spring 6.
Hitch Lever (for single firing)
with the wide Hook of Torsion
spring 6.
(2) Set Torsion spring 6 to Lever (for single firing), or to Stopper plate.
Aligning the half moon section of Stopper plate to that of Lever (for single firing), put Torsion spring 6
between Stopper plate and Lever (for single firing). Set Torsion spring 5 to Stopper plate as illustrated in Fig. 24.
(3) Assemble Stopper plate, Lever (for single firing) and Torsion springs as illustrated in Fig. 24-S.
Stopper plate
Torsion spring 5
Torsion spring 5
Lever for single firing
Torsion spring 5
Put the one of tail of
Torsion spring 5 on the
boss of Stopper plate.
Lever (for
Single firing)
Stopper plate
Face the wide hook side to Lever (for single firing).
And assemble the Torsion spring 6 as illustrated in
Fig. 24-S.
narrow hook
Lever (for
Single firing)
Fig. 24-S
Fig. 24
Lever (for single firing)
Setting Lever (for single firing) together with Stopper plate to
Trigger base, pass Pin 3 through them.
Lever (for single firing) has to be set
under Trip lever as illustrated below.
Trip lever
Trigger
Fig. 25
Trigger base
Trigger base
Pin 3
Lever (for single firing)
Stopper plate
Fix Torsion spring 5 by
hitching the other Tail
(the opposite of the tail
shown in Fig. 24-S) to
the pin of Trigger base.
the other Tail of
Torsion spring 5
(4) Mount the assembled parts shown in Fig. 24 to Trigger base as illustrated in Fig. 25.
(5) Referring to the center and the left illustration in Fig. 17, assemble Trigger base section to Housing set.
P 13/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-9 Adjuster assembly
DISASSEMBLING
ASSEMBLING
(1) Disassemble Adjuster assembly together with Trigger base section as the left and center illustrations in Fig. 17
(2) Separate Adjuster assembly from Trigger base section as illustrated in Fig. 26.
(3) Disassemble the Adjuster assembly as illustrated in Figs. 27 and 28.
1R266
Spring pin 2-14
Adjuster shaft
Steel ball 2.3
Compression
spring 2
Compression
spring 6
Compression
Spring 6
Slide plate
1R032
Fig. 26 Fig. 27
Adjuster
Assembly
Trigger
Base section
Align Adjuster piece to the side window
of Upper yoke by turning it by 90 degrees.
Remove Adjuster piece.
Slide plate can be removed from Upper yoke.
Adjuster piece
Adjuster piece
Upper yoke
Fig. 28
Remove Adjuster shaft by turning carefully so as not to lose
Steel ball 2.3 and Compression spring 2.
90
degrees
(1) Assemble Adjuster piece to Contact arm by inserting its boss into Slide plate in Upper yoke. Refer to Fig. 28.
(2) Turn Adjuster piece in Upper yoke by 90 degrees so that Adjuster shaft can be driven to Adjuster piece.
Refer to Fig. 28.
(3) Assemble Compression spring 2 and Steel ball 2.3 to Upper yoke. Drive Adjuster shaft into Adjuster piece carefully
so as not to lose Steel ball 2.3 and Compression spring 2. Refer to the right illustration in Fig. 27.
(4) Assemble Spring pin 2-14. Refer to the left illustration in Fig. 27.
P 14/ 16
Repair

Fig. 29
Fig. 30
Fig. 31
[4] DISASSEMBLY/ASSEMBLY
[4]-10 Feeding mechanism
DISASSEMBLING
(1) Separate Magazine section from machine, as illustrated in Fig. 10.
(2) Remove Contact arm and Contact top as illustrated in Fig. 15.
(3) Separate Driver guide complete from Housing set as per the left illustration in Fig. 16.
(4) Remove Door, Piston and Feeding claw from Driver guide complete in the order of Figs. 29 to 31.
Pin 4
Push Pin 4 toward the nail firing
direction with slotted screwdriver
in order to protrude the other end
of Pin 4.
Clamping the protruded end of Pin 4
with pliers, pull it off toward the nail
firing direction.
Disassemble Door and Magazine
cap complete from Driver guide
complete.
Pin 4
Urethane ring 3
Door
Magazine cap
complete
Driver guide
complete
Cup washer 5
Compression spring 7
Piston
Feeding claw
Remove Urethane ring 3, and pull off Pin 4-4.5.
Piston and Feeding claw can be removed from Driver guide complete.
Rubber ring 16
Remove Retaining ring R-24 while pressing
Cup washer 5 with your finger so as not to be
slung by Compression spring 7.
Cup washer 5, Rubber ring 16, Compression spring 7
can be removed from Driver guide complete.
Retaining ring R-24
Feeding claw
Pin 4-4.5
Piston
O ring 14
O ring 9
Urethane ring 3
P 15/ 16
Repair

[4] DISASSEMBLY/ASSEMBLY
[4]-10 Feeding mechanism (cont.)
DISASSEMBLING
ASSEMBLING
ASSEMBLING
(1) Insert Piston into Driver guide complete and connect it with Feeding claw. Refer to the right illustration in Fig. 31.
(2) Secure Feeding claw to piston by passing Pin 4-4.5 through Feeding claw and Piston.
Refer to the center illustration in Fig. 31.
(3) Secure the Pin 4-4.5 with Urethane ring 3. Refer to the left illustration in Fig. 31.
(4) Assemble Compression spring 7, Rubber ring 16 and Cup washer 5, and secure them with Retaining ring R-24.
Refer to Fig. 31. And mount Door with Magazine cap to Driver guide complete. Refer to Fig. 29.
[4]-11 Inlet Cap, One touch joint
flat portion of Inlet cap
When removing Inlet cap,
clamp this flat portion of Inlet cap,
in vise, then turn the machine clockwise
as the right illustration.
When removing One touch joint H22PM,
clamp this hexagonal portion in vise, then
turn the machine clockwise as the right
illustration.
hexagonal portion
of One touch joint
H22PM
Inlet cap and One touch joint can be disassembled as illustrated in Fig. 32.
If it is difficult to remove One touch joint H22PM as illustrated in Fig. 32, One touch joint can be disassembled as
illustrated in Fig. 32A.
Note: Be careful the direction to turn One touch joint H22PM or Inlet cap when disassembling. They have
left handed threads.
Take the disassembling step in reverse. Refer to Fig. 32A / 32.
Note: Be careful the direction to turn One touch joint H22PM or Inlet cap when assembling. They have left handed
threads.
If it is difficult to remove One touch joint H22PM as illustrated in Fig.31, take the following steps.
1. Disassemble Inlet cap together with One touch joint H22PM from Housing set.
2. Heat One touch joint H22PM with gas burner.
3. Turn the One touch joint clockwise.
One touch joint H22PM
One Touch Joint H22PM
Inlet cap
gas burner
Fig. 32
Fig. 32A
Inlet cap
P 16/ 16
Repair