Hitachi NV 90HMC Technical Data And Service Manual

Brand: Hitachi

Model: NV 90HMC

Category: Nail Gun

Type: Technical Data And Service Manual

The new Model NV 90HMC is a high-pressure type [3-1/2" (90 mm)] of coil nailer. High-pressure nailer series

products have already been introduced to the Japanese market and become popular nationwide. This new

product offers higher punching force about three times greater than that of conventional nailers, in order to

reduce its size and weight. The new Model NV 90HMC also features strong punching force, a nose switch

mechanism, blow nozzle, dual action trigger, and a tool-less adjuster. Please expand sales of the new Model

NV 90HMC Nailer.

PRODUCT NAME

Hitachi 3-1/2” High Pressure Coil Nailer

Model NV 90HMC

• Floor and wall framing

• Truss and window built-up

• Subflooring and roof decking

• Crate and pallet construction

MARKETING OBJECTIVE

APPLICATIONS

SELLING POINTS

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

LIST No.

NV 90HMC: E061

Dec. 2009

International Sales Division

[NEW FEATURES]

Lightweight and Compact

Powerful

Nose switch mechanism

Blow nozzle

Dual action trigger

Tool-less adjuster

Easy nail loading

Lock mechanism of trigger

REMARK:

• For more information about HANDLING INSTRUCTIONS, visit our website at:

http://www.hitachi-koki.com/manual_view_export/

• Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(are) used in the place of

company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here is(are) as follows:

Competitors

Symbols Utilized

Company Name Model Name

PMAXHN90

CONTENTS

Page

SELLING POINTS -------------------------------------------------------------------------------------------------------------- 1

SPECIFICATIONS -------------------------------------------------------------------------------------------------------------- 3

1. Specifications------------------------------------------------------------------------------------------------------ 3

2. Nail Selection------------------------------------------------------------------------------------------------------ 4

3. Nail Punching Force --------------------------------------------------------------------------------------------- 4

4. Adjusting the Nailing Depth ------------------------------------------------------------------------------------ 6

5. Dual Action Trigger----------------------------------------------------------------------------------------------- 6

COMPARISON WITH SIMILAR PRODUCTS---------------------------------------------------------------------------- 7

1. Comparison of Specifications --------------------------------------------------------------------------------- 7

PRECAUTIONS ON SALES PROMOTION ------------------------------------------------------------------------------ 8

1. Safety Instructions ----------------------------------------------------------------------------------------------- 8

TROUBLESHOOTING GUIDE -------------------------------------------------------------------------------------------- 10

1. Troubleshooting and Repair -------------------------------------------------------------------------------- 10

2. Possible Causes and Corrections of Air Leakage------------------------------------------------------ 15

REPAIR GUIDE---------------------------------------------------------------------------------------------------------------- 18

1. Precautions on Disassembly and Reassembly --------------------------------------------------------- 18

Assembly Diagram for NV 90HMC

-1-

Lightweight and Compact

Thanks to higher punching pressure about three times greater than that of conventional nailers, both nailer

size and weight are reduced.

Powerful

Powerful punching force about 1.3 times greater than that of our conventional NV 90AH Nailer.

High pressure nailer Conventional nailer High pressure nailer

Model NV 90HMC NV 90AB P

Weight 2.5 kg (5.5 lbs.) 3.0 kg (6.6 lbs.) 2.5 kg (5.5 lbs.)

Height 322 mm (12-11/16”) 389 mm (15-5/16”) 327 mm (12-7/8”)

Punching force ratio 1.3 11.1

Nose switch mechanism

Capable of changing outlet sizes (“Small” and “Large”) according to nail head sizes for using various kinds

of nails. (Select a nose according to the head size of nails you use.)

Outlet size ”Small” Outlet size ”Large”

Nail head

diameter

ø 6.0 to ø 7.5 mm

(0.236” to 0.295”)

ø 7.5 to ø 8.6 mm

(0.295” to 0.339”)

Nose

switch

Blow nozzle

Equipped with a blow nozzle, which is very convenient in keeping the work area clean.

SELLING POINTS

Turn down the

switch lever.

Turn up the

switch lever.

7.0 mm

(

0.276”

)

9.0 mm

(

0.354”

)

-2-

Dual action trigger

This function automatically switches between "Single sequential actuation mode" and "Contact actuation

mode" according to the operation sequence. This function can prevent unwanted double firing in "Single

sequential actuation mode."

Tool-less adjuster

Rotating this adjuster adjusts the nailing depth (sink quantity of the nail head).

Easy nail loading

When you open the nail magazine cover, the nail holder automatically tilts toward you so that you can easily

change nail rolls.

Lock mechanism of trigger

This lock mechanism locks the trigger so that it cannot be pulled.

Shallow

Deep

djuste

-3-

1. Specifications

Model

Item

NV 90HMC

Punching system Reciprocating piston type

Operating pressure 12 to 23 kgf/cm

(170 to 320 psi, 12 to 23 bar) (Gauge pressure)

Punching speed Min. 3 pcs./sec.

Weight 2.5 kg (5.5 lbs.)

Dimensions

(Length x Height x Width)

281 mm x 322 mm x 132 mm

(11-1/16" x 12-11/16" x 5-3/16")

Nail feed system Reciprocating piston type

Nail capacity 150 to 300 (1 roll)

Air consumption

2.3 ltr/cycle at 20 kgf/cm

(.081 ft

/cycle at 280 psi) (2.3 ltr/cycle at 20 bar)

Air inlet Air plug for high pressure nailer

Air hose

Air hose for high pressure nailer

(Inner diam.: 5 to 6 mm (13/64” to 15/64”))

Packaging Corrugated cardboard box (sleeve type)

Packaging dimensions

(Length x Height x Width)

355 mm x 410 mm x 170 mm

(14" x 16" x 6-11/16")

Standard accessories

• Case (Code No. 886432)

• Eye protector (Code No. 875769)

• Oiler (30 cc) (Code No. 883136)

• Nose cap (A)(Code No. 886889)

Optional accessories

• Pneumatic tool lubricant (1 oz oil feeder) (Code No. 877153)

• Pneumatic tool lubricant (4 oz oil feeder) (Code No. 874042)

• Pneumatic tool lubricant (1) (Code No. 876212)

NOTE: The Model NV 90HMC applies higher punching force than that of conventional nailers. The

customer must therefore procure an air compressor and an air hose designed for high-

pressure nailers.

The air plug of the Model NV 90HMC is exclusively designed for high pressure and cannot be

connected to any air hoses and compressors that are generally used at much lower air

pressures. Never modify the air plug for lower pressure.

SPECIFICATIONS

-4-

2. Nail Selection

The Model NV 90HMC utilizes common wire-collated and sheet-collated nail coils of 150 to 300 round-head

nails. Applicable nail dimensions are shown below. However, genuine HITACHI nail coils should be used to

assure satisfactory nailing quality.

CAUTION: Ensure that nails are as specified in Fig. 1. Using other nails will cause nail jams and

consequent nailer damage.

Fig. 1

• Dimensions of nails

Wire-collated coil nails Sheet-collated coil nails

Min. Max. Min. Max.

3. Nail Punching Force

Fig. 2 shows by type of wood and nail the nailer output energy provided by the supply pressure, and the

nailing energy required for punching nails flush. Air pressure exceeding the intersecting point between

nailer output energy and the required nailing energy for punching nails ensures fully punched nails.

For example, when punching a nail measuring 3.8 mm in dia. x 90 mm in length (0.148" x 3-1/2") into a

workpiece of hemlock with the Model NV 90HMC, pressure of about 19.6 bar (20 kgf/cm

, 280 psi) enables

the nailer to punch the nail flush with the wood surface. Any higher pressure causes the nail head to sink

below the wood surface.

Fig. 2 should be used only as a reference because the values indicated vary depending on the type of

wood, moisture content, and grain of wood.

6 mm

(0.236”)

2.5 mm

(0.099”)

45 mm (1-3/4”)

8.6 mm

(0.339”)

3.8 mm

(0.148”)

90 mm (3-1/2”)

6mm

(0.236”)

2.5 mm

(0.099”)

45 mm (1-3/4”)

6.5 mm

(0.256”)

3 mm

(0.118”)

50 mm (2”)

-5-

Required nailing energy

Nailer output energy

Fig. 2 • Required nailing energy and nailer output energy

-5-

-6-

Fig. 3 Fig. 4

4. Adjusting the Nailing Depth

The nailing depth can be adjusted by simply turning the adjuster.

* Adjusting the adjuster (Fig. 3)

• Conduct test punching. If the nail sinks too deep, turn the adjuster knob toward the Shallow position

(

mark). If the nail sinks too shallow, turn the adjuster knob toward the Deep position ( mark)

(see Figs. 3 and 4). The nail sink quantity is changed 1 mm per rotation of the adjuster knob.

• Do not push up the pushing lever when turning the adjuster.

• Set the lock lever to the "FREE" position when punching nails.

5. Dual Action Trigger

The Model NV 90HMC is equipped with an automatic mode switching mechanism that automatically

switches between "single sequential actuation mode" and "contact action mode".

(1) Punching operations (automatic switching between single sequential actuation mode and contact action mode)

(1) (2)

Nail

driven

(3)

Nail

driven

Single

sequential

actuation

mode

Depress the pushing

lever.

Pull the trigger.

Driven

Depress the pushing

lever.

Not driven

Contact

action

mode

Pull the trigger. Depress the pushing

lever.

Driven

Depress the pushing

lever.

Driven

(2) Precautions on using the dual action trigger

• Nails are not punched even with the pushing lever again pressed against the workpiece and the trigger

pulled in single sequential actuation mode. To punch nails continuously, remove your finger from the

trigger and operate according to the contact action procedure.

• Note that when you raise the Model NV 90HMC from the floor (after pressing the pushing lever against

the floor) with the trigger pulled, single sequential actuation mode is automatically selected. Therefore,

nails are not punched even when you press the pushing lever against the workpiece. Release the

trigger and operate according to the procedure of the desired mode.

Shallow

Deep

djuste

Lock

Lock leve

Free

Flush

Too deep

(Turn the knob

toward shallow

side.)

Too shallo

(Turn the

knob toward

deep side.)

-7-

1. Comparison of Specifications (Superior specifications:

)

HITACHI

Maker

Model

Item

NV 90HMC

(High pressure nailer)

NV 90AB

(Conventional nailer)

(High pressure nailer)

Operating pressure

12 to 23 bar

(12 to 23 kgf/cm

)

(170 to 320 psi)

4.9 to 8.3 bar

(5 to 8.5 kgf/cm

)

(70 to 120 psi)

12 to 23 bar

(12 to 23 kgf/cm

)

(170 to 320 psi)

Weight

2.5 kg (5.5 lbs.) 3.0 kg (6.6 lbs.) 2.5 kg (5.5 lbs.)

Dimensions (L x H x W)

281 mm x 322 mm x 132 mm

(11-1/16” x 12-11/16” x 5-3/16”)

292 mm x 389 mm x 132 mm

(11-1/2” x 15-5/16” x 5-3/16”)

294 mm x 327 mm x 129 mm

(11-1/2” x 12-7/8” x 5”)

Punching force ratio 1.3

11.1

Nail capacity

300 nails 300 nails 300 nails

Magazine type

Top loading

(Easy nail loading)

Top loading Top loading

Blow nozzle Provided

None

Driving depth

adjustment mechanism

Tool-less

Tool-less Tool-less

Single actuation/contact

actuation selector

Automatic

Manual Automatic

Nose cap Provided

Provided Provided

Free angle plug None

None

Provided

Outlet (size)

Switching type

(ø 7 mm, ø 9 mm)

Fixed type

(ø 8 mm)

Fixed type

(ø 8 mm)

Exhaust direction

Forward

360° changeable Side

Handle grip Rubber Rubber Rubber

Trigger lock Provided None Provided

Collation Wire and Sheet

Wire Wire and Sheet

Head dia.

8.6 mm (0.339") 7.9 mm (0.311") 7.7 mm (0.303")

Shank dia.

3.8 mm (0.148") 3.8 mm (0.148") 3.8 mm (0.148")

Applicable

nails

Length

45 mm to 90 mm

(1-3/4" to 3-1/2")

45 mm to 90 mm

(1-3/4" to 3-1/2")

45 mm to 90 mm

(1-3/4" to 3-1/2")

COMPARISON WITH SIMILAR PRODUCTS

-8-

1. Safety Instructions

In the interest of promoting the safest and most efficient use of the Model NV 90HMC Nailer by all of our

customers, it is very important when concluding a sale that the salesperson carefully ensure that the buyer

seriously recognizes the importance of the Instruction Manual, and fully understands the precautions listed

on the Warning Label attached to each tool.

A. Instruction manual

Although every effort is made in each step of design, manufacture, and inspection to provide protection

against safety hazards, the dangers inherent in the use of any pneumatic tool cannot be completely

eliminated.

Accordingly, the Instruction Manual lists general precautions and suggestions on the use of pneumatic tools,

and specific precautions and suggestions on use of the pneumatic nailer, in order to enhance the safe,

efficient use of the tool by the customer.

Salespersons must be thoroughly familiar with the contents of the Instruction Manual to be able to offer

appropriate guidance to customers during sales promotion activities.

B. Warning Label

Each Model NV 90HMC unit is provided with a Warning Label (illustrated below) that lists basic safety

precautions on tool use. Carefully ensure that customers fully understand and follow these precautions

before using the tool.

PRECAUTIONS ON SALES PROMOTION

-9-

C. Related laws and regulations

As nailers and staplers are designed to instantaneously punch nails and staples, there is an ever-present

danger of misfiring and subsequent possible serious injury. Accordingly, close attention to handling is

absolutely necessary at all times. Carefully ensure that the customer is fully aware of the precautions listed

in the Instruction Manual provided with each unit.

While there are no specific safety regulations, there are related items in various general safety regulations

with which the salespersons should be familiar, in order to properly advise the customer. Please check your

national and/or local regulations for applicable items. Some applicable items are outlined below.

Europe:

EN 792-13:2000 Hand-held-non-electric power tools-Safety requirements-Part

13: Fastener punching tools

The USA:

OSHA 1926.102 Eye and face protection

1926.302 Power-operated hand tools

ANSI SNT-101-2002 Portable, Compressed-Air-Actuated,

Fastener Punching Tools-Safety Requirements for

D. Precautions on operation

(1) Pay special attention to the pressure, capacity and piping of the air compressor, in order to regulate air

pressure supplied to the Model NV 90HMC within the range from 12 kgf/cm

(170 psi, 12 bar) to 23

kgf/cm

(320 psi, 23 bar). Otherwise the performance, service life and safety of the Model NV 90HMC

may be adversely affected. Be sure to install a regulator when using a high-pressure air compressor

with pressure set to 23 kgf/cm

(320 psi, 23 bar) or more. In this case, adjust the air pressure to 23

kgf/cm

(320 psi, 23 bar) or less.

(2) If the dust in compressed air accumulates on the sliding portion, the Model NV 90HMC will not operate

properly. Lubrication effectively removes dust and also prolongs the service life of the Model NV 90HMC

in terms of maintaining good performance. Therefore, the Model NV 90HMC should be lubricated daily.

Supply five to ten drops of lubricant into the air plug on the Model NV 90HMC.

When not using the tool for an extended period, be sure to supply lubricant and perform idle punching

two or three items to lubricate inside, and then apply a thin coating of lubricant to the steel parts to avoid

rusting.

• The table below shows the applicable lubricant. Please recommend the use of Hitachi nailer/tacker oil

to all customers.

Type of oil Brand or product name

Hitachi pneumatic tool lubricant

Shell sliding oil, Tonna S32

(Old Tonna T32);

Code No. 877153 (1 oz. oil feeder)

Code No. 874042 (4 oz. oil feeder)

Code No. 876212 (1 L (1 quart) can))

(3) Be sure to fully drain the compressor’s tank to prevent deteriorated performance or malfunction of the

Model NV 90HMC due to rusting.

(4) Instruct the customers (especially heavy users) to properly conduct inspection and maintenance.

-10-

1. Troubleshooting and Repair

Problem

Possible cause

( *: Most-common cause)

Inspection method Corrective action

<Nails>

• Magazine is not loaded

with specified genuine

nails.

• Magazine is loaded with

abnormal nails (e.g., bent

nails, too large or too

small nail heads,

abnormal collation).

• Nails or link pieces are

jammed.

• Link pieces are deformed

or broken.

• Check that the magazine

is correctly loaded with

specified nails.

• Use specified nails.

• Remove abnormal nails

and load the nailer with

proper nails.

<Punching section: Nose,

feeder, feed piston, etc.>

• Sliding resistance of the

feed piston is too high.

• Remove the feed piston

and check the feed piston

sliding surface of the

nose.

• Apply grease to the sliding

surface.

• Polish the scratched

portion with sandpaper.

Replace the parts.

• Nail guide face of the nose

is abnormal (deformed,

burrs or damaged).

• Feed spring or feeder

spring is abnormal

(damaged or fatigued).

• Feeder is abnormal

(damaged or worn).

• Check that the punching

section is not abnormal

(burrs, deformed,

damaged or worn).

• Deburr the nail guide face.

• Correct the deformed part.

• Replace abnormal parts.

• Nails are not correctly

loaded in the groove of the

nose.

• Check that nails are

correctly loaded in the

groove of the nose.

• Load nails in the correct

position in the nose.

• Dust adheres to the feeder

sliding portion of the nose,

or lubrication is needed.

• Remove dust and then

lubricate the sliding

surface.

• Air pressure is too low. • Adjust the air pressure to

12 to 23 bar (12 to 23

kgf/cm

, 170 to 320 psi).

Nails cannot

be punched.

*• Air passage is clogged

with broken pieces of

piston bumper, etc.

*• Feed piston chamber

contains foreign matter

such as broken pieces of

piston bumper, etc.

• Open the nail guide and

perform idle punching to

check the feeder's

operation.

• Remove foreign matter.

Replace the piston

bumper with new one.

• Body

---Remove foreign

matter in the return

air chamber.

• Nose

---Remove foreign

matter in the air

passage and feed

piston chamber.

TROUBLESHOOTING GUIDE

-11-

Problem

Possible cause

( *: Most-common cause)

Inspection method Corrective action

• Air leaks from the gap

between the body and the

nose.

• Tighten screws and check

the O-rings.

• O-rings are worn or

deformed.

• Replace the O-rings.

• O-rings need lubrication. • Apply grease or lubricant.

• Nail guide face is

abnormal (deformed,

burrs or damaged).

• Check that the nail guide

is not abnormal (worn,

deformed or damaged).

• Correct or replace the

parts.

• Dust adheres inside the

nail guide groove, or

lubrication is needed.

• Remove dust and then

lubricate.

*• Spring is abnormal

(missing, damaged or

fatigued).

• The claw ridge section of

the nail stopper is

abnormal (damaged, worn

or burrs).

• Check the operation of nail

stopper (A) and nail

stopper (B).

• Replace abnormal parts.

• Magazine • Check that a nail does not

catch on another nail in

the magazine.

• Check that a nail does not

catch on any part of the

magazine.

• Check the height of the

nail holder.

• Collate the nails correctly

and then reload the nailer.

• Remove burrs or

deformed parts. Replace

the parts.

• Adjust the height of the

nail holder correctly.

• Pushing lever • Check the operation of the

pushing lever.

• Correct or replace the

parts.

<Output section: piston,

driver blade, etc.>

• Air pressure is too low. • Adjust the air pressure to

12 to 23 bar (12 to 23

kgf/cm

, 170 to 320 psi).

*• Piston O-ring is abnormal

(worn or damaged).

• Replace the piston O-ring.

*• Piston bumper is

abnormal.

• Replace the piston

bumper.

• O-ring in the cylinder is

abnormal (removed,

deformed or damaged).

• Reassemble or replace

the parts.

Nails cannot

be punched.

(continued)

• Driver blade is abnormal

(deformed, burrs or

damaged).

• Open the nail guide and

perform idle punching to

check that the driver blade

is returned.

• Correct or replace the part.

-12-

Problem

Possible cause

( *: Most-common cause)

Inspection method Corrective action

• Cylinder inner surface is

abnormal (packed with

dust or worn).

• Check that nails can be

punched at 4.9 bar (5

kgf/cm

, 70 psi).

• Remove dust and then

lubricate.

• Replace the part.

• Sleeve valve sliding

surface is abnormal

(seized or damaged, or

lubrication needed).

• Perform idle punching to

check punching operation.

• Replace the part.

• Apply grease.

• Sleeve valve rubber is

abnormal (removed or

damaged).

• Sleeve valve spring is

abnormal (fatigued or

damaged).

• Replace the part.

• Plunger, valve piston,

valve bushing (A) or valve

bushing (B) is abnormal

(seized or damaged).

• Perform idle punching to

check that the driver blade

is not held in the down

position.

• Replace abnormal parts.

Nails cannot

be punched.

(continued)

• O-rings or sliding surfaces

are worn or need

lubrication.

• Disassemble the control

valve section and check

the O-rings.

• Replace abnormal parts.

• Apply grease.

*• Adjuster is raised too high

for short nails.

• Check that the adjuster is

not raised too high.

• Turn the adjuster lower

(lower the pressure).

• Nails are not completely

fed into the injection port.

*• Unspecified nails are

used.

• See item 1). • See item 1).

*• Driver blade is worn. • Check that the driver

blade tip is not abnormally

worn.

• Replace the part.

Nails are

punched but

bent.

• Workpiece is too hard. • Check if a nail is bent even

when punched into soft

wood.

• Nailer cannot be used

because the material is

beyond its applicable

range.

• Adjuster is incorrectly set. • Set the adjuster to the

optimum position.

• Air pressure is too low.

• Turn the adjuster to the

lowest position and then

punch nails.

• Adjust air pressure to

12 to 23 bar (12 to 23

kgf/cm

, 170 to 320 psi).

Nails cannot

completely

punched

into the

workpiece:

the heads

cannot be

made flush.

• Workpiece is too hard. • Check if a nail is bent even

when punched into soft

wood.

• Nailer cannot be used

because the material is

beyond its applicable

range.

-13-

Problem

Possible cause

( *: Most-common cause)

Inspection method Corrective action

*• Driver blade is worn. • Perform idle punching to

check whether the driver

blade protrudes from the

nose tip.

• Replace the part.

*• Piston O-ring is abnormal

(worn or damaged).

• Cylinder inside surface is

abnormal (worn or rough).

• Disassemble the output

section and check the

piston O-ring and inside

the cylinder for

abnormality.

• Replace abnormal parts.

Nails cannot

completely

punched

into the

workpiece:

the heads

cannot be

made flush.

(continued)

• Sleeve valve sliding

surface is abnormal

(seized or damaged, or

lubrication needed).

• Check the sliding surface

for abnormality and

lubrication.

• Replace abnormal parts.

• Apply grease.

• Check whether the

specified nails are used.

• Check the nails as follows:

• Use specified nails.

• Remove abnormal nails

and load the nailer with

proper nails.

Nails jam.

<Nails>

*• Unspecified nails are

used.

*• Abnormal nails are

mixed.

*• Nail heads are too large

or too small.

[Wire-collated nails]

• Collating wires are

abnormal (broken, failed

welding, deformed or

failure at welding

position).

*• Collating wires are

deformed (deformed in

collation angle or

collation pitch).

[Sheet-collated nails]

*• Collating sheets are

abnormal (deformed or

broken).

• Nails are removed from

the sheets.

[Wire-collated nails]

[Sheet-collated nails]

[Wire-collated nails]

[Sheet-collated nails]

Unit: mm (inch)

6 to 8.6

(0.236 to 0.339)

2.5 to 3.8

(0.099 to 0.148)

(0.748)

37.5

(1.476)

Unit: mm (inch)

6 to 6.5

(0.236 to 0.256)

2.5 to 3

(0.099 to 0.118)

-14-

Problem

Possible cause

( *: Most-common cause)

Inspection method Corrective action

<Body: Nail feeding is

incomplete.>

• Feeder is worn and the

sliding section abnormal.

• Nail guide face of the nose

or the sliding section of

the feeder is abnormal

(deformed, burrs or

damaged).

• Feed spring or feeder

spring is abnormal

(damaged, fatigued or

removed).

• Open the nail guide and

check the position of the

feeder claw.

• Replace abnormal parts.

<Body: Nail guide section>

• Nail guide section is

abnormal.

• See item "1) Nail guide

section."

• See item "1) Nail guide

section."

<Driver blade does not

return completely.>

• See item "1) Output

section: piston, driver

blade, etc."

• Perform idle or actual

punching to check

whether the driver blade

returns completely.

• See item "1) Output

section: piston, driver

blade, etc."

Nails jam.

(continued)

• Air pressure is too high. • Nails may be jammed if

punched at high pressure

and high speed. Check

the pressure and

punching speed.

• Adjust air pressure within

the range of 12 to 23 bar

(12 to 23 kgf/cm

, 170 to

320 psi).

-15-

OFF ON

Magnified view of B

Control valve section

• Air leakage repair location

2. Possible Causes and Corrections of Air Leakage

1. Air leakage repair location

Section of A - A

-16-

2. Repair procedure

(1) Check the following parts marked with an asterisk " * " for trouble.

(2) Then check the seal parts (with the

mark) for excessive wear, flaws and breaks.

(3) Next, check the other possible parts.

[Bold] numbers in the description below correspond to item numbers in the Parts List and exploded

assembly diagram for the Model NV 90HMC.

Possible causes

Air leak point

Control valve OFF Control valve ON

Exhaust port

Defects on Sleeve Valve Rubber [18] (worn,

cut or flaws), or defects on seal surface of

Upper Cover [5] (damage, deformation or

flaws of

part).

Defects on O-Ring (I.D 48.5) [12], O-Ring

[16], O-Ring [20], and O-Ring [21] (worn,

cut or flaws)

Defects on seal surfaces of Exhaust Cover

[15], Sleeve Valve [19] and Cylinder [36]

(damage, deformation or flaws on (

parts)

* Defects on seal surface of Sleeve Valve

[19] (damage, deformation or flaws on the

parts)

Defects on Exhaust Rubber [22] (worn,

deformation or cut)

Defects on O-Ring (I.D 48.5) [12] (worn,

cut or flaws)

Exhaust Cover

Loose Nylock Bolt M5 x 65 [4]

Damage on Gasket (C) [17] and Packing

(B) [8]

Defects on seal surfaces of Body Ass'y

[42], Exhaust Cover [15], Plate [9] and

Upper Cover [5] (damage, deformation or

flaws)

Nose1

Loose Nylock High Tension Bolt M7 x 25

[56]

Defects on O-Ring (1AP-3) [106] (worn,

cut or flaws)

Defects on O-Ring (S-34) [46] of Body

Ass'y [42] (cut or flaws) and defects on its

seal part (damage, deformation or flaws on

part)

Nose 2

Defects on O-Ring (S-36) [37] of Cylinder

Plate [38] (worn, cut or flaws)

Defects on O-Ring (S-32) [25] of Cylinder

[36] (worn, cut or flaws)

Defects on seal surfaces of Body Ass'y

[42] and Cylinder Plate [38] (damage,

deformation or flaws of (

parts)

Defects on Piston Bumper [45]

(deformation or crack damage of

parts)

Defects on Piston (H) [11] and Nose [47]

(deformation, dust, or seal surface

defects)

Feed Piston

Defects on Feed Piston O-Ring (I.D. 14)

[108] (worn, cut or flaws) or defects on

sliding surface of Nose [47] (worn,

deformation or flaws)

Defects on O-ring (P-9) [107] of Nose [47]

(worn, cut or flaws) or defect on sliding

surface of Feed Piston [109] (worn,

deformation or flaws)

-17-

Possible causes

Air leak point

Control valve OFF Control valve ON

Control valve

exhaust port

Defect on O-Ring (P7-U) [89] of Valve

Piston [91] (worn, cut or flaws)

Defect on O-Ring (I.D 1.8) [94] of Plunger

[95] (worn, cut or flaws)

Defect on O-Ring (S-14) [86] of Valve

Bushing (B) [88] (worn, cut or flaws)

* Defect on inner surface of Body Ass’y [42]

valve chamber (

part)

Defect on O-Ring (1AP-11) [92] and O-

Ring (P9-U) [90] of Valve Piston [91]

(worn, cut or flaws)

Defect on O-Ring (S-16) [87] of Valve

Bushing (B) [88] (cut or flaws)

Defect on O-Ring (1AP-5) [96] of Valve

Bushing (A) [98] (worn, cut or flaws)

* Defect on Valve Plate [24] seal surface

(breaks, deformation, flaws on

part)

* Defect on the inner surface of Body Ass’y

[42] valve chamber (

part)

Control valve Defect on O-Ring (S-16) [87] and O-Ring

(S-6) [97] of Valve Bushing (A) [98] (worn,

cut or flaws)

Defect on sliding surface of Plunger [95]

O-Ring (S-6) [97] (deformation or flaws on

part)

Defect on O-Ring (S-16) [87] and O-Ring

(S-6) [97] of Valve Bushing (A) [98] (worn,

cut or flaws)

Defect on sliding surface of Plunger [95]

O-Ring (S-6) [97] (deformation or flaws on

part)

Valve Bushing

(air

duster

valve

section

)

Break of Valve Packing [26]

Defect on O-Ring (1AP-3) [30] (worn, cut or

flaws) or defect on Valve Bushing [33] seal

surface (flaws or breaks on

part)

Loose Valve Bushing [33] screw (left-

handed thread)

Cap (Defects on O-Ring (I.D 37.2) [61] (worn,

cut or flaws))

Loose Cap (Gold) [62] screw (left-handed

thread)

Defects on seal surface of Body Ass'y [42]

and Cap (Gold) [62] (damage, deformation

or flaws on

part)

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Hitachi NV 90HMC Technical Data And Service Manual

Brand: Hitachi

Model: NV 90HMC

Category: Nail Gun

Type: Technical Data And Service Manual

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Hitachi NV 90HMC Technical Data And Service Manual

Hitachi NV 90HMC Technical Data And Service Manual

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