NEPTUNE

Operation Manual

Read and follow all instructions and SAFETY PRECAUTIONS before
using this equipment.

Table of Contents
MODELS ....................................................................................................... 3
SPECIFICATIONS .............................................................................................. 3
PARTS LIST .................................................................................................. 3
SAFETY PRECAUTIONS ................................................................................ 4
INSTALLATION .................................................................................................. 5
OPERATION .................................................................................................... 5
PREVENTIVE MAINTENANCE ..................................................................... 5
REPLACEMENT OF PARTS ............................................................................. 6
SERVICE CHECKS ............................................................................................ 7
ACCESSORIES .................................................................................................. 82MODELSNEPTUNE – Air Cap No. – Fluid Tip Size – Type of Feed CG : Center Gravity(Ex.) : NEPTUNE-110B-1.3-CG ← (110B Air Cap - Size1.3mm – Center Gravity)

SPECIFICATIONS

Maximum Working Air Pressure: 0.69 MPa, Maximum Working Fluid Pressure: 0.69 MPa
Weight: 379g (excl. cup)
Fluid inlet : G3/8 Air inlet :G1/4
Chart. 1
Air Cap No.
Part Number
110B
NEP-3-110B
Chart. 2
Fluid Tip
Part Number
NEP-4-1.2
NEP-4-1.3
NEP-4-1.4

Type of Feed

Air consumption
Gun inlet pressure

Pattern width (mm)CG

192ｌ/min
0.15MPa300

Needle Part Number

Tip size (mm)Application

NEP-41-1.2
NEP-41-1.3
NEP-41-1.4

1.2
1.3
1.4

Automotive Refinishing
Automotive Refinishing
Automotive Refinishing

PARTS LIST
Chart 3

Ref No. Part No.
Description
1NEP-6
Retaining Ring
2
NEP-50-K5 Cap Seat Kit of 53NEP-55-K5 Ring Gasket Kit of 5
4NEP-3-110B Air Cap5See Chart.2 Fluid Tip
6NEP-7Baffle
7NEP-100
Baffle Tube
8NEP-8-K5 Baffle Gasket Kit of 5
9N/AGun Body
10 NEP-44
Pattern ValveQTY Ref No.
Part No.
113NEP-25-K5
14NEP-12
15
See Chart.2
116
NEP-14-K5
117NEP-13
118
NEP-463
19NEP-45-K5
20NEP-108
121NEP-42
122NEP-30

11NEP-443-3P Air Seal Kit

112NEP-43

1Air Valve233

SN-26-K4

Description
QTY
Valve Spring Kit of 5
1Air Valve Bushing
1Needle1Needle Spring Kit of 5
1Needle Adjustment Knob1Needle Packing Kit
1Bearing Stud Kit
1Trigger1
Cheater Valve
1Air Connector
1Color ID Ring Kit
1(4 Colors)

SAFETY PRECAUTIONSThis manual contains information that is important for you to know and understand. This
information relates to USER SAFETY and PREVENTING EQUIPMENT PROBLEMS. Read andfollow SAFETY PRECAUTIONS before using this equipment.

■ FIRE OR EXPLOSION HAZARD
1.

When spraying, adequate exhaust must be provided to keep air free of accumulations offlammable vapors which may cause fire or explosion.

2.

Smoking must never be allowed in the spray area.

3.

Static electricity is generated and a static spark could be produced in the spray area. To
prevent the risk of fire or explosion, ground without fail all conductive objects in the sprayarea.

4.

Make it sure to use and ground hoses with static wire for spray gun operation. If
improperly grounded, a static spark possibly produced may cause fire or explosion.

5.

Fire extinguishing equipment must be provided in the spray area.

6.

Solvents used for cleaning must have a flash point equal to or higher than that of thecoating. Those for general cleaning must have flash points above 37.8°C (100°F) toprevent the risk of fire.

■ INHALING TOXIC SUBSTANCES
1.

Toxic vapors and liquids are harmful to health. When spraying, adequate exhaust must be
provided to keep the air free of accumulations of toxic materials and the use at all times of
respiratory protective equipment must be set compulsory.

2.

Always wear eye protection when spraying or cleaning the equipment.

3.

Certain materials may be harmful if there is contact with the skin. Read carefully all thelabels and safety performance data of the materials and solvents to be used. Appropriate
clothes and gloves must be worn for spraying or cleaning the equipment.

■ MISUSE
1.

Operators should be given adequate and appropriate training in the safe use andmaintenance of this equipment.

2.

Pressured liquids may injure eyes. Do not point the spray gun to any person.

3.

Gravity or suction feed gun must not be used for pressure feed gun.

4.

Parts with compressed air may damage the human body. Connect air hoses tightly byusing a spanner so that air never leaks. If tightened loosely, hoses can be removed which
may result in damaging the human body, objects to be coated and other equipment used
together.

5.

Parts with compressed air or under spring pressure may injure the human body.

Whenreplacing such parts, clean the spray gun by discharging the materials, discharge the air,remove air hose and fluid cup and then replace such parts by placing the gun flat. Eyeprotection must be worn when repairing the spray gun.
6.

Do not use the gun at no more than maximum working pressure (0.69MPa).

4

INSTALLATION
1.
2.

The air supplied to spray gun must be cleaned air which any water, oil and solid material
removed. To set up the Mist Separator and Air Transformer near the gun is recommended.
The use of air not cleaned may cause coating troubles.
Connect fluid cup and air hoses tightly. If tightened loosely, hoses can be removed which
may result in damaging the human body, objects to be coated and other equipment used
together.

OPERATION
1.

The recommended pressure of air supplied to gun inlet is in a range of 0.15MPa-0.25MPa.
Do not supply to gun the air pressure in excess of the gun’s maximum working pressure(0.69MPa).

2.

Try with the pressure starting from 0.15MPa – 0.25MPa or around as the spraying
pressure varies depending upon the inner diameter of gun, triggering distance, materials
etc.

3.

The recommended spray distance is 150-200mm. If the spray distance is too far, goodresult does not appear.

4.

In order to get uniform finishing, the spray gun should be hold vertically toward the painting
surface.

PREVENTIVE MAINTENANCE
1.

Daily lubrication and cleaning is necessary to maintain the best condition of the gun.

2.

To clean the gun body, wipe exterior with solvent dampened cloth. Do not submerge thegun body in solvent as any solids may get into the air passage and cause troubles.

3.

Do not leave the gun with solvent in fluid cup. Clean the spray gun after used with clean
solvent and empty the cup. To clean the fluid cup, after removing extra paint, through theappropriate solvent and flush down the residual paint.

4.

The Air Cap can be immersed in solvent and brushed down for cleaning. If orifices areclogged, use a toothpick to remove obstruction. Never use a steel wire or hard instrument.
This will damage air cap and result in a distorted spray pattern.

5.

Do not immerse any plastic parts in solvent for long time.

6.

Certain portions of gun should be lubricated. Do not lubricate to any portion where notinstructed. For lubrication, SSL-10 Gun Lube* is recommended (*sold separately,vegetable not repelling materials).

7.

The following portions should be lubricated regularly; Bearing Stud (19), Pattern Valve(10), threads of cheater Valve (21) and Needle Adjusting Knob (17), Air Valve (12) stem,
portion of Packing Gland (18) here Needle (15) comes in and out.

8.

When installing Air Cap (4), make sure no foreign materials adhered on Retaining Ring (1)and thread of body and then oil one drop of Gun Lube SSL-10.

9.

Apply non-silicone grease lightly on Needle Spring (16) and Air Valve Spring (13). Do not
apply too much grease as it may clog the air passage.

5REPLACEMENT OF PARTS
Before replacing gun parts, remove materials from the gun for cleaning. Then release the airpressure in the gun and disconnect air hoses. All repairs should be made on a clean flat surface.
Use only appropriate tools indicated for replacement of parts.

Fluid Tip (5) and Needle (15)1.

It is recommended to replace Fluid Tip (5) and Needle (15) as a set.

2.

Loosen completely Pattern Valve (10) by turning the knob counterclockwise.

3.

Remove Needle Adjusting Knob (17) and Needle Spring (16) and then withdraw Needle(15) from the gun body.

4.

Remove Retaining Ring (1) and Air Cap (4).

5.

Remove Fluid Tip (5) by using socket wrench or offset wrench.

6.

Recommended torque of Fluid tip is 8N·m when you re-assemble.

Air Connector (22)
Air Connector (22) is fixed together by sealing material. Do not disassemble these connectors if
it is not necessary. It may become a cause of problem.

Pattern Valve (10) and Cheater Valve (21)When disassembling and reassembling Pattern Valve (10) and Cheater Valve (21), turn the knobs
completely counterclockwise and then disassemble or reassemble them.

Air Seal Kit (11), Air Valve(12), Valve Spring(13), Air Valve Bushing(14)1.

Remove Needle Adjusting Knob (17) and Needle Spring (16) then withdraw Needle(15) from the Gun Body (9).

2.

Remove Air Valve Bushing (14), Valve Spring (13), Air Valve (12).

3.

From the back of the Trigger (20), push the front part of the Air Seal Kit toward the back of
the gun to remove it, and remove the seal in the center.

4.

Hook the rear part of the Air Seal in the Air Valve Bushing (14) using a thin wire to remove it.

5.

Do not reuse the removed Air Seal because usually it has been damaged.

6.

Attach the new Air Seal and insert it into the body with insert tool and Bushing. See theexploded view and be careful of the installation direction when attaching.

Needle Packing Kit (18)1.

Remove Bearing Stud kit (19) and Trigger (20) using flat-blade screwdriver.

2.

Remove Fluid Adjusting Knob (17) and Needle Spring (16) from gun, and then remove
Needle (15).

3.

Loosen and remove the Needle Packing Kit (18) using wrench.

4.

Re-assembling the Needle Packing Kit (18). Assemble into gun body by hand and thentighten using the wrench.

5.

Insert Needle (15), Needle Spring (16), and Needle Adjusting Knob (17).

6.

Re-assembling Bearing Stud kit (19) and Trigger (20) using flat-blade screwdriver.

7.

Trigger the gun several times to verify correct operation and adjust the packing by usingthe wrench.

6

SERVICE CHECKSNormal spray patternproblemWill not spray

Cause
No pressure to gun.

Correction
Check air and material lines.

Needle Adjusting Knob (17) not properlyadjusted.
Improper spray pattern A,B : Material build up on the Air Cap orFluid Tip.

Jerky or fluttering
sprayC,D : Adjust.

Insufficient material in the cup or Looseconnector.

Fill cup or tighten the Connector.

Worn Needle Packing (18).

Dripping from fluidtip(5)

A,B : Clean the Air Cap or Fluid
Tip.

C,D : Incorrect fluid delivery or viscosity.

Gun material passage plugged.

Fluid leaking fromneedle packing(18)Adjust.

Loose or damaged Fluid Tip (5).
Loose of Needle Packing (18)

Clean.
Replace.
Tighten or replace.
Tighten Needle Packing (18).

Worn or damaged Needle Packing (18).
Wor n o r damaged Fluid Ti p (5) o r
Needle (15).

Tighten or replace.
Replace.

Stuck Needle Packing (18) or Needle (15).

Lubricate.

Incorrect adjustment of Needle Packing (18) Hold the end of the Needle (15)with your hand to adjust. Fix it but
leave some space so that it canstill move a little bit.
Loose Needle Adjusting Knob (17)7Adjust.

ACCESSORIESPart No.
GFC-501

Description
568ml(1 pint) acetal gravity cup assembly

GFC-402
GFC-440-K
GFC-400
KGP-509-1
KGP-401
KGP-5-K5
KGP-5-440-K5

Lid assembly for GFC-501
400ml Anodized Aluminum Gravity cup assembly with Multi-Lid
Multi Lid (Lid assembly for GFC-440, KGL-400-FA-ST, KGL-400-FA-JT,
KGL-400-FA-JPRO, KG-400C-FA, KGL-400, KG-400, KG-400T
284ml(1/2 Pint) Nylon gravity cup
Lid assembly for KGP-509-1 Gravity cup
Gravity cup filters (kit of 5) for GFC-501 / KGP-509-1
Gravity cup filters (kit of 5) for GFC-440

SN-26-K4
KGP-13-K5

Color ID Ring Kit (4 colors)
Cup Gasket kit (Kit of 5)2020.03-NEPTUNE-E08

8