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

, Packing (A) 32, and Related Parts:

Tools Required:

8 mm, 6 mm and 5 mm Hexagon Bar Wrenches

3 mm Roll Pin Remover

5 mm Spanner

(a) Disassembly:

Loosen the two M5 x 25 Hexagon Socket Hd. Bolts 72 and two M6 x 20 Hexagon Socket Hd. Bolts

which fix the Magazine Base Ass’y 69, and remove the Magazine Base Ass’y

by withdrawing it from the Tail Cover

−#1#−

Body (B) Ass’y

Cylinder O-Ring

Cylinder Damper

Piston Damper

Damper Ring

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

which fix the Tail Cover 38, and remove the Tail Cover 38 and Push Lever Ass’y

to the Tail Cover 38 side without fail. Also, do not fully

from the Body (B) Ass’y 26. On completion of the above disassembly procedures, Packing (A) 32, the Piston Damper

, 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

. Please note that if the Cylinder 19 has not been already dis-

cannot be removed

at this time.

47 D3 x 30 Roll Pin

Plunger (B)

Piston Ass’y

72 M5 x 25 Hexagon

Socket Bolt

Tail Cover

M7 x 25 Hexason

Socket Hd. Bolts

Push Lever Ass’y

66 Ribbon Spring Ass’y

Nail Feeder

Spring Shaft

Washer

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

Magazine side (see Fig. 8 below). Plunger (B) 58 may drop out during disassembly. Ensure it is properly assembled.

Assemble the Body (B) Ass’y 26, Tail Cover 38, and Magazine Ass’y 81 in the following

manner:

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

to the Body (B) Ass’y 26 with the four M8 x 25

, and tighten them to rated torque (see para. 1-4).

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

III) Temporarily attach the Ribbon Spring Ass’y

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

has been assembled to Body (B) Ass’y 26.

to the Body (B) Ass’y 26 with the D3 x 30 Roll Pin

and Nail Feeder 64 to the Tail Cover

was only loosened and not fully removed during reassembly [refer to Fig. 16] ), and assemble the Magazine Base Ass’y

(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

(2) Cylinder

, Piston Ass’y 14 and Related Parts:

Tool Required:

6 mm Hexagonal Bar Wrench

(a) Disassembly:

Loosen the four M6 x 25 Hexagon Socket

Hd. Bolts Cover Packing (G) piston Ass’y

, and remove the Exhaust

from the Body (B) Ass’y 26.

25 14

(see Fig. 9) As illustrated in Fig. 10, screw two of the

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.

. Using the bolts, pull

M6 x 25 Hexagon Socket Hd.

Bolt Piston

Ass’y

Packing (B)

Cylinder

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

−#3#−

Fig. 10 Removal of cy linder plate

The Cylinder 19, Cylinder Spring 22, and other components which constitute the Output System (see Fig. 11) can then be removed. As it should be difficult to remove the Cylinder

, first remove the Tail Cover 38 as described in section 1-1-(1), and push the Cylinder upwards and out from below.

(b) Assembly:

Assembly 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 Magazine (see Fig. 8 above). Ensure that Packing (G) 25 is properly fitted

to the shape of its matching hole in the Body (B) Ass’y

, properly aligned with the

assembly as shown in Fig. 11, and properly contacts the base of the Exhaust Piece Ass’y

(see

Cylinder Plate

Cylinder

Cylinder Spring

Cylinder Guide

Packing (G)

Packing (G) Hole (B) Body (B) Ass’y

Fig. 12).

(3) Head Cap Ass’y

Related Parts: Tool Required:

6 mm Hexagonal Bar Wrench

(a) Disassembly;

Remove the Exhaust Cover 5 as described in

section 1-1-(2). Loosen the three M6 x 45 Hexagon Socket Hd.

Bolts

and, as illustrated in Fig. 12, remove

the Head Cap Ass’y

, Exhaust Piece Ass’y 8, Packing (C) 9,

and Packing (F)

(b) Reassembly:

Reassembly can be accomplished by following the disassembly procedures in reverse. However, special attention should be given to the following items.

Packing (C) 9 and Packing (F) 7 should be

replaced with new genuine Hitachi parts. Tighten the M6 x 45 Hexagon Socket Hd. Bolts

to rated torque (see Para. 1-4.).

Exhaust Piece Ass’y 8, and

Valve Rubber Ass’y

Fig. 11 Main body output disassembly

M6 x 45 Hexaton Socket Bolt

Top Cover

Exhaust Cover

Packing (F)

Exhaust Piece Ass’y

Packing (C)

Valve Rubber

Ass’y

8 9

Head Cap Ass’y

Fig. 12 Disassembly of main body ,

upper part

−#4#−

1-2. Dsassembly and Reassembly of the Val ve Section:

Tools Required:

3 mm Roll Pin Remover

Minus-Hd. Screwdriver

(a) Disassembly:

(please refer to Fig. 13)

Remove the Magazine Ass’y 81 as described in

section 1-1- (1). Remove the Push Lever Ass’y 50 as described in

section 1-1- (1). With the 3 mm Roll Pin Remover, take out the D3 x 30

Roll Pin Plunger Insert the minus-Hd. screwdriver into the groove of

the Trigger Valve Bushing

, and remove the Trigger 57, Trigger

, and Plunger (B) 58.

, and loosen it by turning it to the left, being careful not to damage the groove. After removing the Trigger Valve Bushing 62, pull

down strongly on the Valve Bushing the Valve Bushing Plunger Spring

, Plunger (A) 54, and the

to remove

Plunger Spring

Plunger (A)

Valve Bushing

Trigger

Plunger (B)

Plunger (A)

Plunger (B)

Valve Plate Trigger Valve

Bushing

Trigger Plunger

D3 x 30 Roll Pin

Fig. 13 Disassembly of v al ve

(b) Reassembly:

Reassembly can be accomplished by following the disassembly procedures in revese. However, special attention should be given to the following items:

Be very careful in handling the Plunger Spring 52,

as it can become twisted very easily. To prevent the two O-Rings on the outside of t he

Valve Bushing

from being damaged when inserted into the Body, carefully apply grease t o t he Body hole and the outer circumference of the O-Rings prior to assembly.

The Push Lever Ass’y 50 can be adjusted by loosening

the M5 Nut Perform adjustment to a point where the resistance of

Plunger (B)

and turning the Safety Bolt 48.

pushing up Plunger (A) 54 is felt

(see Fig. 14):

when the Push Lever Ass’y is raised. At this point, t he lower end of the Tail Cover

should be separated

Safety Bolt

Tail Cover

3.5 ± 0.5 mm

(.138 ± .020 )

M5 Nut

Push Lever Ass’y

Fig. 14 Push lever assembly adj ustment

from the lower end of the Push Lever Ass’y by 3.5 mm ± 0.5 mm (.138"± . 020").

−#5#−

1-3. Disassembly and Reassembly of the Magazine Section:

(1) Magazine Base Ass’y

, Nail Feeder 64, Ribbon Spring Ass’y 66, and Related Parts:

Tools Required:

6 mm and 5 mm Hexagon Bar Wrenches

5 mm Spanner

(a) Disassembly:

Shift the Nail Feeder 64 to the Tail Cover 38 side in a state where it is held by the Ribbon

Spring Ass’y Remove the two M5 x 25 Hexagon Socket Hd. Bolts 72 and the M6 x 20 Hexagon Socket

Hd. Bolt Loosen the front-side M6 x 20 Hexagon Socket Hd. Bolt 33 (opposite from the Guard

36B

side), and withdraw the Magazine Base Ass’y 69 from the Tail Cover 38. The

Magazine Ass’y

on the Guard

, Ribbon Spring Ass’y 66 and related parts can then be disassembled

36B

side.

(see Fig. 15). Please note that if the front-side M6 x 20 Hexagon Socket Hd. Bolt and not fully removed, the Nail Feeder mounted on the Tail Cover the Magagine Base Ass’y

Spring Shaft

. This facilitates disassembly and reassembly when only

need to be removed.

and Ribbon Spring Ass’y 66 can be kept

33 M6 x 20 Hexagon Socket Bolt

Guard

is only loosened

M5 x 25 Hexagon Socket Hd. Bolt

Ribbon Spring Ass’y

Nail Feeder

Magazine Base Ass’y

37 Washer

33 M6 x 20 Hexagon Socket Hd. Bolt

(with Bonding Agent)

Fig. 15 Disassembly / Reassembly of the Magazine Section

−#6#−

(b) Reassembly:

Reassembly can be accomplished by following the disassembly procedures in reverse. However, special attention should be given to the following items.

As illustrated in Fig. 16, temporarily

fix the Ribbon Spring Ass’y 66,

Spring Shaft 65 and Nail Feeder

onto the Tail Cover 38 with the front-side M6 x 20 Hexagon Socket Hd. Bolt 33, and slide the Magazine Base Ass’y 69 onto the Tail Cover

. Then, secure the assembly by tightening the M6 x 20 Hexagon Socket Hd. Bolt 33 on the Guard

36B

side and the two M5 x 25 Hexagon Socket Hd. Bolts 72 to rated torque (see Para. 1-4). Finally, loosen the front-side M6 x 20

Hexagon Socket Hd. Bolt 33, shift the Nail Feeder 64 fully back into the magazine, ensure the Magazine Base Ass’y 69 is properly aligned, and tighten the front-side M6 x 20 Hexagon Socket Hd. Bolt 33 to rated torque (see Para. 1-4)

(2) Stop Lever 74, Stopper Spring 76, and

Related Parts: Tools Required:

5 mm and 4 mm Hexagon Bar Wrenches

5 mm and 4 mm Spanners

(a) Disassembly: (see Fig. 17)

After removing the M5 x 45 Hexagon

Socket Hd. Bolt 71 and M4 x 15 Hexagon Socket Hd. Bolt 77, the parts illustrated in Fig. 17 can be taken out.

(b) Reassembly: (see Fig. 18)

Reassembly can be accomplished by following the disassembly procedures in reverse. However, special attention should be given to the following items.

As illustrated in Fig. 18, insert the

Collar 75 into the Stop Lever 74, and mount the Stopper Spring

with the M4 x 15 Hexagon Socket Hd. Bolt 77 (see Para. 1-4 for tightening torque). At this time, the Stopper

Washer

M6 x 20 Hexagon Socket Hd. Bolt

Tail Cover

Fig. 16 Mounting of the Nail Feeder

74 Stop Lever

Fig. 17

71 M5 x 45 Hexagon

Socket Hd. Bolt

Fig. 18 Reassembly of the Stop Lever,

Stopper Spring, etc.

70 Sleeve

Collar

70 Sleeve

74 Stop Lever

Stopper Spring

Nail Feeder

65 Spring Shaft

66 Ribbon Spring Ass’y

M5 x 45 Hexagon Socket Hd. Bolt

M4 x 12 Hexagon Socket Hd. Bolt

76 Stopper Spring

M4 x 12 Hexagon Socket Hd. Bolt

Collar

−#7#−

Spring 76 must be assembled so that one of its hooked portions is inserted into the Stop Lever Magazine Base Ass’y

Fix the Sleeve 70 in position with the M5 x 45 Hexagon Socket Hd. Bolt 71 (see Para.

, and the other hooked portion is inserted into the small hole provided on the

1-4 for tightening torque).

1-4. General Precautions on Reassembly:

Apply grease (Hitachi Motor Grease No. 29, Code No. 930035, is recommended) to the O- Rings and t he

O-Ring sliding portions. When reassembling the O-Rings, be particularly careful not to damage them, or permit dust or other foreign matter to enter the mechanism. If the Packings are damaged, replace them without fail and ensure that there is no air leakage after

repair. Be particularly careful not to permit dust or other foreign matter to enter the Valv e Section.

Coat a small amount of grease (or sliding oil) on the sliding portions of the Nail Feeding Section.

Rated tightening torques for fastening bolts, nuts, screws and t he Pist on Ass’y are as follows:

Bolt / Nut type Rated Tightening Torque

Hexagon Socket Hd. Bolt M8 ................

260 ± 20 kg-cm (18.8 ± 1.4 ft-lb)

Hexagon Socket Hd. Bolt M6 ................1, 4,

Hexagon Socket Hd. Bolt M5 ................45, 71,

Hexagon Socket Hd. Bolt M4 ................

Nut M5....................................................

77 51

33 72

100 ± 8 kg-cm (7.2 ± 0.6 ft-lb)

65 ± 5 kg-cm (4.7 ± 0.4 ft-lb) 45 ± 3 kg-cm (3.2 ± 0.2 ft-lb) 35 ± 3 kg-cm (2.5 ± 0.2 ft-lb)

1-5. Inspection and confirmation After Reassembl y or Repair:

Confirm that the Nail Feeder 64 and Stop Lever 74 move smoothly.

Operate the Nailer with an air pressure of 4 kg/cm2 (60 psi), and confirm that there is no abnormal

driving or bending of nails. With appropriate torque wrenches and / or torque drivers, confirm the correct tightening torque of all

nut, screws and bolts.

−#8#−

HITACHI NR 83A User guide

Specifications and Main Features

Frequently Asked Questions

User Manual