Manual Hitachi NV50A1 (page 10 of 46) (English, German, Dutch, French, Italian, Spanish)

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4. Inspecting the drive bit

If the top end of the drive bit is slightly rounded to an

extent that nail heads slightly float above the work

surface, or the nails are often bent, remove the drive

bit and finish off the top end with a file or grinder.

(1) Removing procedures

(a) Remove four hexagon socket hd. bolts to

disassemble the exhaust cover, whereby the piston

is exposed. (See Fig. 10)

(b) Insert an appropriate rod into the nail outlet to

withdraw the piston from the opposite side. (See

Fig. 11)

(2) Grinding procedures

(a) When grinding the top end by using a grinder, to

avoid wear, gradually grind it while cooling the

grinding part with water. Excessive grinding may

shorten the Nailer service life.

(b) If nail heads still float above the work surface even

though the top end is ground, replace the drive bit

with a new bit. (Replace the drive bit when

projection beyond the top of tail cover is reduced

to approximately 3 mm (.12”).) Drive bits are

available from the dealer where you ordered the

nailer.

(3) Reassembling procedures

Effect reassembling procedures in reverse order to

those of disassembling. Confirm that the drive bit is

fully inserted the nail outlet. Then reassemble the

exhaust cover. Finally apply a thin coat of grease

(Attolub No. 2 Grease) to the O-ring and interior

surface of the cylinder. (See Fig. 12)

CAUTION

⅜ A cracked drive bit may cause damage. Prior to

reassembling the drive bit, be sure to check for such

cracks.

5. Inspecting the piston

A depletion of cylinder oil or a worn O-ring may

restrict smooth operation. In such instances remove

the piston as illustrated in Figs. 10, 11 and 12 and clean

the cylinder interior. Then apply 2cc of the

recommended oil over the cylinder interior surface. If

the piston still refuses to offer smooth operation,

replace the worn O-ring.

Also, apply a thin coat of grease (Attolub No. 2 Grease)

to the cylinder interior and the O-ring.

CAUTION

⅜ Never clean the O-ring with gasoline, thinner, or

similar substance.

6. Inspecting the feeders

(1) Occasionally clean the knob sliding part and then

apply the recommended oil. (See Fig. 13)

(2) Open the nail guide and remove dust, etc., as shown

in Fig. 14. Apply lubricant to the sliding groove of the

feeder and feeder shaft. Check the main nail stopper

and sub nail stopper slide smoothly by pushing them

with your finger.

(3) Also, apply the recommended oil to the feeding sur-

face of the nose and nail guide after cleaning. This

promotes smooth operation and retards corrosion.

CAUTION:

Check for smooth movement of the feeders and

stoppers before use. If movement is uneven, nails

could be fired at an irregular angle, presenting a

hazard to the operator and others nearby.

Type of lubricant Name of lubricant

Recommended oil SHELL TONNA

Motor oil SAE10W, SAE20W

Turbine oil ISO VG32 – 68

(#90 – #180)

7. Service parts list

A : Item No.

B : Code No.

C : No. Used

D : Remarks

CAUTION:

Repair, modification and inspection of Hitachi Power

Tools must be carried out by an Hitachi Authorized

Service Center.

This Parts List will be helpful if presented with the tool

to the Hitachi Authorized Service Center when re-

questing repair or other maintenance.

In the operation and maintenance of power tools, the

safety regulations and standards prescribed in each

country must be observed.

MODIFICATIONS:

Hitachi Power Tools are constantly being improved

and modified to incorporate the latest technological

advancements.

Accordingly, some parts (i.e. code numbers and/or

design) may be changed without prior notice.

COMPRESSOR

CAUTION:

When the maximum, operating pressure of the air

compressor exceeds 8.3 bar (120 psi.), be sure to

provide a reducing valve between the air compressor

and nailer. Then, adjust the air pressure within the

operating range of 4.9 ~ 8.3 bar (70 ~ 120 psi.). If the air

set is installed, lubrication is also possible, thus

providing additional convenience.

OILER-FILTER-REDUCING VALVE (Air Set)

So that the equipment can be operated under an optimum

condition to ensure extended service life, it is advisable to

use an oiler filter reducing valve. Please limit the length of

the hose between the unit and the air set to within 10m

when using.

APPLICABLE LUBRICANTS

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Hitachi NV50A1 Manual

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