Hitachi Koki NV 38AB2, Handling Instructions Manual

7

English

2. Inspection and maintenance

Periodically inspect the device.

(1) Remove the four hexagon socket hd. bolts securing

the exhaust cover and remove the exhaust cover.
Then, cylinder, piston, and other parts can be removed
in respective assembly groups.
Wipe the drive bit, the piston sliding part and the
body interior with a cloth to remove deposited dirt.

(2) Confirm that the piston damper offers normal

operation. A damaged piston damper may cause
damage to other component parts.

(3) Prior to reassembling the device, apply recommended

oil to the piston-ring. Also, lubricate the device with
the recommended oil.

3. Check on mounting screws for each part

At regular intervals check every part for loose
mounting screws and whether or not there are any
air leaks. Retighten any loose screws. Operating the
equipment with loose screws untightened will incur
a hazard.

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. 17

).

(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. Apply a thin coat of recommended oil
to the Piston-ring and interior surface of the cylinder.
(See 

Fig. 19

)

Cylinder

Piston Ring

Piston

Fig. 19

CAUTION:

䡬

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 Piston-ring may
restrict smooth operation. In such instances remove
the piston as illustrated in 

Figs. 17, 18

  and 

19

  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 Piston-ring.

CAUTION:

䡬

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. 20

)

Knob

Fig. 20

Nail Guide

Fig. 18

Insert a rod into
the nail outlet.

Piston
withdrawable here

Fig. 17

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

withdraw the piston from the opposite side.

Piston

Exhaust Cover

Hexagon socket
Hd. Bolt