— 10 —
English
TESTING THE NAILER
DANGER
Always wear eye protector.
WARNING
Never use Nailer unless push lever is operating
properly.
The machine employs a preventive mechanism for
unloaded operation.
The machine enters a state where the push lever stopper
runs into the upper part of the push lever and the push
lever cannot be pushed up. This takes place when the
magazine is not loaded with nails or when the remaining
number of nails becomes less than 5 (This differs by the
type of nail).
CAUTION
Use caution not to throw the push lever tip onto wood
and the like while the push lever stopper is in the
upper part of the push lever.
Before actually beginning the nailing work, test the Nailer
by using the checklist below. Conduct the tests in the
following order.
If abnormal operation occurs, stop using the Nailer and
contact a Hitachi authorized service center immediately.
(1) DISCONNECT AIR HOSE FROM NAILER.
REMOVE ALL NAILS FROM NAILER.
ALL SCREWS MUST BE TIGHTENED.
If any screws are loose, tighten them.
5. Air consumption
Using the Air consumption table and the Air
compressor size formula, find a correct compressor size.
Air consumption table
Air compressor size formula
Amount of air required
=number of Nailers
×
average nails driven each minute per Nailer
×
air consumption at given air pressure
×
safety factor (always 1.2)
Example: 2 Nailers operating at 100 psi driving 30 nails
per minute
Amount of air required
=2
×
30
×
.088 (2.5)
×
1.2
=6.3 CFM (ft
3
/min) (180 ltr/min)
After making the calculations as shown above, you
should find a compressor providing 6.3 CFM of air that
is required.
LUBRICATION
It is important that the Nailer be properly lubricated.
Without proper lubrication, the Nailer will not work
properly and parts will wear prematurely.
Use Hitachi pneumatic tool lubricant.
Do not use detergent oil or additives. These lubricants
will harm the O-rings and other rubber parts. This will
cause the Nailer to malfunction.
Filter-regulator-lubricator units should always be used.
Keep the lubricator filled with Hitachi pneumatic tool
lubricant.
If a lubricator is not available, supply 5 – 10 drops of
Hitachi pneumatic tool lubricant into the air plug on
the Nailer twice a day.
COLD WEATHER CARE
Do not store the Nailer in a cold weather environment.
Keep the Nailer in a warm area until beginning the
work.
If the Nailer is already cold, bring it in a warm area and
allow the Nailer to warm up before use.
1
Reduce the air pressure to 64 psi (4.4 bar
4.5 kgf/cm
2
).
2
Remove all nails from the Nailer.
3
Connect the air hose and free-fire (blank-fire) the
Nailer.
The lowered air pressure will be enough to free-fire
the Nailer.
Slow speed operation tends to warm up the
moving part.
CAUTION
Do not free-fire the Nailer at high pressure.
psi
80
90
100
Operating pressure
(bar)
(5.5)
(6.2)
(6.9)
(kgf/cm
2
)
(5.6)
(6.3)
(7)
Air consumption
ft
3
/cycle
.078
.088
.095
(ltr/cycle)
(2.2)
(2.5)
(2.7)
Push Lever
Push Lever Stopper
5
Summary of Contents for NR 90AC2
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