Hitachi NV 90HMC 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/cm2(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/cm2

(.081 ft3/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/cm2, 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/cm2)

(170 to 320 psi)

4.9 to 8.3 bar

(5 to 8.5 kgf/cm2)

(70 to 120 psi)

12 to 23 bar

(12 to 23 kgf/cm2)

(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 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

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