HITACHI NR 83A User guide
MODEL NR 83A
1. PREAUTIONS IN DISASSEMBLY AND REASSEMBLY:
For general reference purposes, the Model NR83A can be said to consist of three major sections: the
Output Section, the Valve Section and the Magazine Section. The descriptions below explain important
points in the disassembly and reassembly of these sections. The circled numbers in the descriptions
correspond to the item numbers in the Parts List and exploded assembly diagram.
[CAUTION] Prior to disassembly/reassembly, ensure without fail that the air hose is disconnected from
the Nailer, compressed air is completely discharged, and all nails are removed.
1 -1. Disassembly and Reassembly of the Output Section:
(1) Piston Damper
31
, Packing (A) 32, and Related Parts:
Tools Required:
z#
8 mm, 6 mm and 5 mm Hexagon Bar Wrenches
z#
3 mm Roll Pin Remover
z#
5 mm Spanner
(a) Disassembly:
z#
Loosen the two M5 x 25 Hexagon Socket Hd. Bolts 72 and two M6 x 20 Hexagon Socket
Hd. Bolts
33
which fix the Magazine Base Ass’y 69, and remove the Magazine Base Ass’y
by withdrawing it from the Tail Cover
38
.
−#1#−
Body (B) Ass’y
26
Cylinder O-Ring
28
Cylinder Damper
29
31
Piston Damper
Damper Ring
30
32
Packing (A)
[CAUTION] Prior to loosening the t wo M6 x 20 Hexagon Socket Hd. Bolts 33, shift the
Nail Feeder
remove the front-side M6 x 20 Hexagon Socket Hd. Bolts
Extract the D3 x 30 Roll Pin 47, remove the four M8 x 25 Hexagon Socket Hd. Bolts
z#
which fix the Tail Cover 38, and remove the Tail Cover 38 and Push Lever Ass’y
64
to the Tail Cover 38 side without fail. Also, do not fully
33
.
50
from the Body (B) Ass’y 26.
On completion of the above disassembly procedures, Packing (A) 32, the Piston Damper
z#
31
, Damper Ring 30 and Cylinder Damper 29 can be taken out from the lower portion
of the Body (B) Ass’y
assembled as described in Pare. 1 -1 (2) below, the Cylinder O-Ring
from the Body (B) Ass’y
26
. Please note that if the Cylinder 19 has not been already dis-
28
cannot be removed
26
at this time.
47 D3 x 30 Roll Pin
58
Plunger (B)
14
Piston Ass’y
72 M5 x 25 Hexagon
Socket Bolt
40
Tail Cover
38
40
M7 x 25 Hexason
Socket Hd. Bolts
50
Push Lever Ass’y
66 Ribbon Spring Ass’y
64
Nail Feeder
65
Spring Shaft
37
Washer
33
M6 x 20 Hexagon
Socket Bolts with
Bonding Agent
Fig. 7 Disassembly and Reassembly of the Piston Damper, Packing (A), etc.
(b) Reassembly:
Reassembly can be accomplished by following the disassembly procedures in reverse. However,
special attention should be given to the following items:
Ensure that the Piston Ass’y 14 is positioned so its semicircular groove faces toward the
z#
Magazine side (see Fig. 8 below).
Plunger (B) 58 may drop out during disassembly. Ensure it is properly assembled.
z#
Assemble the Body (B) Ass’y 26, Tail Cover 38, and Magazine Ass’y 81 in the following
z#
manner:
50
I) With the Push Lever Ass’y
Fig. 7, assemble the Tail Cover
Hexagon Socket Hd. Bolts
properly mounted on the Tail Cover 38 as illustrated in
38
to the Body (B) Ass’y 26 with the four M8 x 25
40
, and tighten them to rated torque (see para. 1-4).
69
Magazine Base Ass’y
−#2#−
[CAUTION] Please note that the Push Lever Ass’y 50 cannot be assembled after the
Tail Cover
II) Connect the Push Lever Ass’y
47
.
III) Temporarily attach the Ribbon Spring Ass’y
38
with the M6 x 20 Hexagon Socket Hd. Bolts 33 (please note that this step is not
necessary if the front-side M6 x 20 Hexagon Socket Hd. Bolt
38
has been assembled to Body (B) Ass’y 26.
50
to the Body (B) Ass’y 26 with the D3 x 30 Roll Pin
66
and Nail Feeder 64 to the Tail Cover
33
was only loosened and
not fully removed during reassembly [refer to Fig. 16] ), and assemble the Magazine Base
Ass’y
69
(refer to Para. 1-3- (1)).
[NOTE] Please refer to Para. 1-4 below for appropriate tightening torques for nuts
and bolts.
Semi-circle Groove
Drive bit
Piston
Piston Ass’y
Fig. 8 Semi-circle groove of piston ass’y
19
(2) Cylinder
, Piston Ass’y 14 and Related Parts:
Tool Required:
6 mm Hexagonal Bar Wrench
z#
(a) Disassembly:
Loosen the four M6 x 25 Hexagon Socket
z#
Hd. Bolts
Cover
Packing (G)
piston Ass’y
4
, and remove the Exhaust
5
from the Body (B) Ass’y 26.
25
14
(see Fig. 9)
As illustrated in Fig. 10, screw two of the
z#
M6 x 25 Hexagon Socket Hd. Bolts
partially into their matching holes on the
Cylinder Plate
the Cylinder Plate upward while turning
it to remove it from the Body.
, Packing (B) 6, and the
can then be removed.
4
17
. Using the bolts, pull
M6 x 25
Hexagon
Socket Hd.
4
#
Bolt
Piston
14
Ass’y
Packing (B)
6
Cylinder
17
Plate
Fig. 9 Disassembly of Upper
Exhaust Cover
Packing (G)
Cylinder
Body (B) Ass’y
Part of Main Body
M6 x 25 Hexagon
Socket Hd. Bolt
M6 Threaded Hole
Cylinder Plate
#
5
25
19
26
4
17
−#3#−
Fig. 10 Removal of cy linder plate
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