FINER-CORE

Instruction Manual000

Symbol Marking on the Spray Gun:

Hand Spray Gun

Ⅱ2GExhX

This MEIJI AIR spray gun
complies with 2014/34/eu Directive
relating to equipment and protective
systems intended for use in
explosive potentially atmospheres.

Specific
Marking for
Explosion
Protective

Complies
with
European
DirectiveⅡ2GExhX

Group Ⅱ(Surface)

Category(Zone 1＆2)

Type ofAtmosphere(GAS)

lgnitionProtection(not applied)

Additional conditions:
Any static Electricity
should be discharged
and needs to be
diverted to the ground
via a conductive air
hose not included.

Thank you for purchasing MEIJI Hand Spray Gun.

Installation

Before Using this Product■ To ensure safe and proper use of this product, be sure to read through this operation manual, and understand the contents of this manual thoroughly before using the product.
■ After reading this operation manual, keep it in place for your quick reference whenever required.
■ To lend or transfer this product, attach this operation manual to the product.
■ If this operation manual is lost or damaged, immediately order a new one from our authorized dealer or distributor.
■ To improve the product quality or performance or to ensure safety, the parts used in the product are subject to change. In this case, note that the description and some parts in
the illustrations may be different from those of the actual product.
■ If you have any question or comment about the product, contact the distributor of this product or our authorized dealer or distributor in your district.

Indicates a case where failure in observing the advice on proper handling manners,
or neglecting appropriate precautions may result in injury or death, and/or serious
damage to the product.

WARNING/CAUTION

Other Precaution
1. Do not modify the product.
 Do not modify spray gun.
 If you modify spray gun, it cannot provide sufficient performance. Also, a failure of the machine may result.
2. Stop other equipment.
 To conduct spray work in an operating area of other equipment (robot, reciprocating equipment, etc.), confirm that the equipment has stopped
first.
 If you touch a robot or reciprocating equipment, you may get injury.
3. Do not use spray gun for food and chemicals.
 Do not apply spray gun to food or chemicals.
 Corrosion of paint circuit may result in an accident. Also, mixture of foreign substances may result in health disorder.
4. If an abnormal condition occurs, immediately stop spray gun.
 If you find a problem, immediately stop spray gun, and examine the cause of the problem. Do not use gun until the problem can be solv

Fire and Explosion
1. Keep fire off your paint spray work area.
 Paint is inflammable, causing fire and explosion. To conduct spray work, select a wide, well-ventilated place.
 Be sure to keep an inflammable object (cigarette, ignition equipment, electric equipment, etc.) off your spray work area.
 To clean spray gun, use a solvent whose flash point is equivalent to, or higher than that of the paint being used. Using a general cleaning
solvent may cause a fire. Use a cleaning solvent with 37.8°C or higher flash point.
 Provide a fire extinguisher in your spray work area.
2. Do not use a halogenated hydrocarbon solvent.
 Chemical reaction with the solvent causes spray gun body (aluminum parts) to crack or melt.
 Incompatible solvent: methyl chloride, ethyl chloride, methylene dichloride, ethylene dichloride, carbon tetrachloride, trichloroethylene, 1.1.1
trichloroethane, etc.
 Before using a special paint or paint thinner, thoroughly check if the material is compatible or not.
3. Connect ground cable.
 Ground spray gun securely. For example, use a hose with ground wire.
 If spray gun is not securely grounded, it may generate sparks of static electricity, causing a fire and explosion.

1. Use clean compressed air.
 Use clean compressed air that has passed through an air dryer or air filter. If contaminated air is used, it results in a failure in spray work.
2. Ensure tight connections.
 When connecting a paint cup or an air hose to spray gun, tighten them securely by using a spanner. If the connection is loose, compressed air,paint and other liquids may spatter over human body, painted work pieces and peripheral equipment, resulting in damage.
3. Conform to the rated withstand pressure of a hose.
 Make sure that air pressure supplied to an air hose does not exceed the rated withstand pressure of hose. Do not use an old or adamaged hose.

1. Operating Procedure
1. Mount a paint cup and air hose securely to the spray gun by using a spanner or other tool.
2. Although it varies depending on the paint viscosity, property, and operating conditions, a recommended spraying pressure is between 0.15 to0.25 MPa.
Never use spray gun at a pressure higher than the maximum operating pressure (0.69 MPa).
3. Recommended spraying distance is 150 to 250 mm. If spray gun is too close to a target work piece or it swings like an arc, good finishedquality cannot be obtained.
4. To obtain a uniformly finished condition, always hold spray gun at a right angle to the spraying surface.

Protection of Human Body
1. Ensure thorough ventilation.
 To conduct spray work, be sure to select a well ventilated place with a booth.
 If you conduct spray work in an airtight room or insufficiently ventilated place, you may suffer poisoning caused by organic solvent, or a risk
factor of flammability will increase.
2. Wear appropriate clothes and protective gear.
 During spray and cleaning work, always wear appropriate clothes and protective gear (goggles, G-7-04 masks, and gloves).
 Some kinds of paint cause a hazard if the paint touches eyes or skin. Check the paint and solvent being used. During spray and cleaning
work, wear appropriate clothes and gloves.
3. We recommend users to wear ear plugs for health and safety.
 The product may produce a noise level of 80 dB (A) or higher depending on the use condition or work environment.
4. Take a rest if you get tired during spray work.
 Pulling the trigger many times during long-hours of work may cause tendovaginitis.

5. Tightening the air volume adjusting screw clockwise will decrease the air volume, and loosening the air volume adjusting screw
counterclockwise will increase the air volume.
6. If you tighten the pattern adjusting screw by turning it clockwise completely, paint is sprayed in a spot pattern. As you loosen the patternadjusting screw by turning it counterclockwise, spray pattern area gradually increases.
When you rotate the screw approximately three times, the pattern area becomes the maximum. Adjust the spray pattern depending on thespray work step and the type of paint being used.
7. If you tighten the paint adjusting screw by turning it clockwise, spray volume decreases. As you loosen the screw by turning it
counterclockwise, spray volume gradually increases. When you rotate the screw three to four times, spray volume becomes the maximum.
Set paint volume depending on spray work conditions.

Paint adjusting screw

1. Do not direct spray gun toward people.
 Never attempt to spray paint toward people or animals.
 Failure to observe this instruction may result in inflammations of eyes and skin, or other hazard to human body.
2. Use spray gun within the maximum operating pressure.
 Never use spray gun at a pressure higher than the maximum operating pressure (0.69 MPa).
3. During interruption of work, release compressed air.
 Before cleaning, disassembly or maintenance/inspection of spray gun, or during a halt of spray work, be sure to release compressed air fromspray gun If compressed air is remaining in spray gun, it may accidentally work, or cleaning solvent may spatter, causing a hazard to human body.
 To release compressed air from spray gun, stop supplying compressed air, paint, or paint thinner to spray gun, and pull the trigger lightly.
4. Do not touch the tip of the needle valve and paint nozzle during maintenance.
 The tip of the needle valve and paint nozzle is very sharp and may cause an injury.

Max.

1. Clean and lubricate spray gun everyday to maintain it in the best operating condition
2. Wipe dust off the spray gun body with a cloth damped with a solvent.
If spray gun is soaked in a solvent, lubricant is removed, and an adhering substance enters air circuit, causing a trouble in spray work.
We shall not be liable for any problems resulting from the use of a gun cleaner that causes dust or paint waste to enter the air
circuit of paint nozzle or air cap.
3. After using spray gun, be sure to clean it with a clean solvent, and leave the cup empty.
4. To clean cup, remove surplus paint from cup first, and then pour an appropriate solvent into cup to wash off residual paint completely.
5. If spray gun is used with a cleaning solvent remaining in the gun and cup, and with paint waste or dust adhering to paint circuit, it causes afailure in spray work.
6. After disassembling air cap (3) and paint nozzle (2), clean them with a brush. When disassembling air cap (3) and paint nozzle (2), be careful
not to damage them.
7. To clean paint circuit, spray a small quantity of solvent as in the same manner as spray work.
8. Be sure not to damage each hole of air cap (3), and the center hole and tip periphery of paint nozzle (2).
9. If needle valve ass'y (6) or air valve (26) malfunctions, apply a small quantity of oil (non-silicone oil) to the sliding part from the outside.
10. After cleaning the equipment with water, be sure to eliminate water. Residual water causes the equipment to rust away.
11. Soaking whole spray gun in solvent may cause spray gun malfunction. Also soaking air cap ass’y. itself for extended period may cause a
defective spray pattern.

3. Specifications
Paint nozzle

feedboresystemmm

Gravity

1.3
1.5
1.3
1.5

FINER-CORE-13
FINER-CORE-15
FINER-CORE-HVLP-13
FINER-CORE-HVLP-15

Spraying
Applicable air cap

distancemm

Spraying air
Air
Paint spraying
pressure(Cap internal consumption
volumepressure)L/min
mL/minMPaFINER-CORE

200
FINER-CORE-HVLP

0.20

300

0.18(0.07)

380

Maximum
effectiveConnection

Weightpattern

diametergmm

170
200
135
155

280
300
280
300

G1/4 (Air)G3/8 (Paint)

340* The paint viscosity values are equivalent to 20 seconds for the lacquer enamel paint using Meiji V-1 viscosity cup.

4. Parts List

No.

-3-

Rotation direction ofpattern adjusting screw(Spot pattern)
Counterclockwise(Flat pattern)
Air volume
adjusting screw-2-

2. Maintenance and Inspection

PaintMin.

Rotation direction ofpaint adjusting screw

Clockwise-1-ModelCounterclockClockwisewise

Pattern adjusting screw

Improper Handing of Equipment

NameQuantity

1Body

12

Paint nozzle

15. Parts Replacement
Before replacing spray gun parts, remove residual paint, and clean spray gun. Then, release air pressure from spray gun, and remove the air hoseand paint cup.
To repair spray gun, place it in a clean level place, and wear protective goggles. For parts replacement, use the specified appropriate tools.
 Replacement of paint nozzle and needle valve ass y (It is recommended that these parts should be simultaneously replaced.)
1. Remove paint adjusting screw (35) and needle spring (9), and pull out needle valve ass'y (6) from the spray gun body.
2. Remove air cap set (3).
3. Remove paint nozzle (2) by using a spanner 17 or socket wrench 17.
4. Tighten paint nozzle (2) at a tightening torque of 10 N・m by using a torque wrench.
 Replacement of air volume adjusting valve ass'y and pattern adjusting valve ass'y
1. Before assembling or disassembling air volume adjusting valve ass'y (16) and pattern adjusting valve ass'y (17), turn the knobcounterclockwise completely to loosen it.
 Replacement of valve seat, air valve, valve spring, O-ring presser, and needle cylinder
1. Remove paint adjusting screw (35) and needle spring (9), and pull out needle valve ass'y (6) from the spray gun body.
2. Remove needle cylinder (34) using socket wrench 14.
3. Remove O-ring presser (29), valve spring (27), and air valve (26) from the spray gun body.
4. Remove valve seat (30) by using hexagon wrench 10, so that seat surface on the mounting part will not be damaged.
5. Tighten valve seat (30) by using hexagon wrench 10 until the seat touches the spray gun body. Then, re-tighten the seat lightly.
6. Insert air valve (26) until it reaches the innermost end so as not to damage seat surface. Then, insert valve spring (27) and O-ring presser (29).
7. Tighten needle cylinder (34) using socket wrench 14.
 Replacement of packing presser spring, O-ring presser, packing guide, and O-ring S10 perfluor
1. Following the procedure for “Replacement of valve seat, air valve, valve spring, O-ring presser, and needle cylinder”, remove the relevant parts.
2. Remove packing presser spring (25), O-ring presser (29), packing guide (28), and O-ring S10 (31).
3. If packing guide (28) and O-ring S10 (31) are hard to remove, vibrate spray gun.
4. Insert O-ring S10 (31), packing guide (28), O-ring presser (29), and packing presser spring (25) in this order.
 Replacement of sleeve
1. Remove needle packing screw (23) with spanner 10.
2. Remove sleeve (24).
3. Insert sleeve (24).
4. Tighten needle packing screw (23) with spanner 10.

’

6. Troubleshooting
Trouble condition
Paint breaking

Cause

Corrective action

Lack of paint in the paint cup

Refill paint.

3

Air cap set

1

The paint circuit is clogged.

Clean the air circuit with a solvent.

6

Needle valve ass'y

1

Tightening or replacement

9

Needle spring1

A screw of the paint circuit connecting part, or paint nozzle (2), is loose, or the tapered
seat is damaged.
Sleeve (24) has been worn out, or the needle packing screw (23) is loose.

10

Spring insert

1

Replace sleeve (24) or re-tighten needle packing
screw (23) securely.

Part of the square hole of air cap (3) has been clogged or damaged.

Cleaning or replacement

Paint or dust is adhering to the tip periphery of paint nozzle (2).

Cleaning or replacement

Part of the square hole of air cap (3) has been clogged or damaged,

Cleaning or replacement

11Trigger

1

12Trigger pin

113Trigger screw

1

16

Air volume adjusting valve ass'y

1

17

Pattern adjusting valve ass'y

1

20

U-packing P5

2

22

Trigger presser

123

Needle packing screw24

One-sidedpattern

Crescentpatternor paint or dust is adhering to inside of the center hole, or the center hole has beendamaged.
Paint or dust is adhering to the tip periphery of paint nozzle (2).

Cleaning or replacement

Paint nozzle (2) has been worn out, and nozzle bore diameter increased.

Replacement

1

Spraying air pressure is too low.

Increase spraying air volume and pressure.

Sleeve1

Paint viscosity is too high.

Reduce paint viscosity.

25

Packing presser spring

1

Spraying air pressure is too high.

Reduce spraying air volume and pressure.

26

Air valve1

Dust or paint is adhering to the gap between the center hole of air cap (3) and the
periphery of paint nozzle (2).

Cleaning

Paint leak from the needle
packing screw

Needle packing screw (23) is loose.
Sleeve (24) has been worn out.

Adjust needle packing screw (23).
Replacement

Paint leak from the tip of thepaint nozzle

Paint nozzle (2) or needle valve ass'y (6) has been worn out or damaged.
Sleeve (24) or needle valve ass'y (6) is stuck.
Improper adjustment of needle packing screw (23)

Replacement
Lubrication
Adjustment

27

Valve spring

128

Packing guide129

O-ring presser230

Valve seat131

O-ring S10

132

Hexagon nipple 1/4×M11

134

Needle cylinder

135

Paint adjusting screw

136

Paint adjusting screw cover137

Adjusting screw cover

238

Hexagon socket set screw

339

Head base (with parallel pin)1

Thick in middle

Narrow in middle

2022/06/09 E2022/06/09

Head Office 3-14, 2-chome, Tagawa, Yodogawa-ku Osaka 532-0027, Japan
Tel:+81-6-6309-1227 Fax:+81-6-6309-0157

MEIJI AIR COMPRESSOR MFG. CO., LTD.

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