Hitachi NT 50AE2 Manual page 2

IMPORTANT SAFETY INSTRUCTIONS
DANGER
READ AND UNDERSTAND THIS MANUAL BEFORE DOING REPAIRS.
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Only service personnel trained by Hitachi, distributor or employer shall
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repair the Nailer[Stapler( in case of N3804AB3)].
Use only parts supplied or recommended by Hitachi for repair.
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Before doing repairs,
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1) WEAR SAFETY GLASSES;
2) DISCONNECT AIR HOSE FROM NAILER[STAPLER]; and
3) REMOVE ALL NAILS[STAPLES] FROM NAILER[STAPLER].
After doing repairs,
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TEST NAILER[STAPLER] PER ITEM No. 11 OF THIS MANUAL
BEFORE USE.
If you have any questions regarding repair, use or safety warnings, call a
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Hitachi authorized service center. If you need to locate a Hitachi autho-
rized service center, please call Hitachi Power Tools U.S.A. Ltd. at 1-800-
546-1666.
CAUTION ON REPAIR
Oily or greasy hands can slip easily.
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Do not allow dust or foreign matter to enter Nailer[Stapler].
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Do not scratch the O-rings or O-ring contacting surface of any parts.
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HOW TO REPAIR ※ Figure uses NT50AE2.
※[ ] are in case of N3804AB3.
1. The tools needed for repair are shown
below.
1
Allen Wrench For
M5 Screw
O-Ring Pick
3. Remove all nails[staples] from the
Stapler[Nailer].
3
5. Remove piston ass'y and cylinder.
5
Cylinder Piston Ass'y
7. Using o-ring pick, remove old o-rings.
Discard old o-rings.
8.Wipe body, exhaust cover, head valve(A),
cylinder and cylinder plate with clean cloth.
Put an adequate amount of grease on
shaded area of body, exhaust cover, head
valve (A), cylinder and cylinder plate. Put an adequate amount of grease on
new o-ring.
8
Body Exhaust Cover
2. Disconnect the air hose from the
Nailer[Stapler].
2
4. Using Allen wrench for M5 screw,
remove four bolts from cap.
Remove cap.
4
Exhaust cover
Bolt
6. Remove head valve(A) from exhaust
cover.
6
Head Valve (A)
Exhaust cover
7
O-Ring Pick
old O-Ring
Cylinder Cylinder Plate
Head Valve (A)
9. Pay attention not to scratch exhaust cover
and body when remove old gasket.
Install new o-rings as shown right.
Install cylinder with cylinder plate and piston
ass'y into body.
Make sure that head valve spring and
head valve o-ring are properly placed in
head valve(A).
Install head valve piston into exhaust cover.
10. Install packing, cap and four bolts.
Using Allen wrench for M5 screw,
tighten four bolts in a staggered sequence.
11.
When reassembled, always conduct
following tests in the following order.
If abnormal operation occurs, stop
using the Nailer[Stapler] and contact
a Hitachi
(1) DISCONNECT AIR HOSE FROM NAILER
[STAPLER]. REMOVE ALL NAILS
[STAPLES] FROM NAILER[STAPLER].
□ALL SCREWS MUST BE TIGHTENED.
If any screws are loose, tighten them.
□THE PUSH LEVER AND TRIGGER
MUST MOVE SMOOTHLY.
(2) Adjust the air pressure to 70 psi
2
(4.9 bar 5 kgf/cm ). Connect the
air hose. Do not load any nails
[staples] in the Nailer [Stapler].
Set the switching device to the
upward position (SINGLE
ACTUATION MECHANISM).
(Set the switching device to the
upward position comnpletely as shown in the diagram.Otherwise, it will not
operate properly.)
□ THE NAILER[STAPLER] MUST NOT LEAK AIR.
(3) Remove the finger form the trigger and press the push lever against the
workpiece.
□ THE NAILER[STAPLER] MUST NOT OPERATE.
(4) Separate the push lever from
the wood. Next, point the nailer
[stapler] downward, pull the
trigger and then wait in that
position for 5 seconds or longer.
□THE NAILER[STAPLER]
MUST NOT OPERATE.
(5) ①Without touching the trigger, depress the push lever against the workpiece.
Pull the trigger.
□ THE NAILER[STAPLER] MUST OPERATE.
②Hold the trigger back while separating the push lever from the wood.
□The nailer[stapler] will remain in operated status (the driver blade will remain
at the bottom).
③Remove the finger from the trigger.
□Nailer[Stapler] operation will end (the driver blade will return to the top).
(6)Set the switching device to the downward
position (CONTACT ACTUATION MECHANISM).
(Set the switching device to the downward position
completely as shown in he diagram. Otherwise, it will
not operate properly.)
With the Nailer[Stapler] off the workpiece, pull the
trigger. Depress the push lever against the workpiece.
□THE NAILER MUST OPERATE.
(7) If no abnormal operation is observed, you may load nails[staples] in the Nailer
[Stapler]. Drive nails[staples] into the workpiece that is the same type to be used
in the actual application.
□ THE NAILER[STAPLER] MUST OPERATE PROPERLY.
12. Change the WARNING LABEL if missing
or damaged.
A new WARNING LABEL is available from
a Hitachi authorized service center.
9
Head Valve
Spring
Head
Valve(A)
Cylinder Plate
Piston Ass'y
Cylinder
10
Exhaust Cover
Bolt
11-(1)
Trigger
Push
Lever
11-(2)(3)
Upward position
Depress
Push Lever
Switching Device
11-(4)
Upward position
Pull Trigger
Switching Device
11-(6)
Switching
Device
Downward position
12
Warning Label
708
Code No. C99521611
Printed in Taiwan
Do not
connect
air hose
Do not pull
Trigger