NEPTUNE-C

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 – C - Air Cap No. – Fluid Tip Size PT(Ex.) : NEPTUNE-C-777-11PT ← (777 Air Cap - Size1.1mm)

SPECIFICATIONS
Maximum Working Air Pressure: 0.69 MPa, Maximum Working Fluid Pressure: 0.69 MPa
Weight: 378g , Fluid inlet : G3/8, Air inlet :G1/4
Chart. 1
Air Cap No.
Part NumberAir consumption
Gun inlet pressure

Pattern width (mm)487L/min
0.35MPa

300

493L/min
0.35MPa300

Tip size (mm)Needle Part Number

Application

1.1
1.4
1.6

NEP-41P-FZ(Common)

Automotive
Large-sized
Metal plate

Type of Feed

777
31767-777

Pressure797
AV-1239-797

Chart. 2Fluid Tip
Part Number
NEP-4S-11
NEP-4S-14
NEP-4S-16

PARTS LIST
Chart 3
Ref No. Part No.
Description
1NEP-6
Retaining Ring
2
NEP-50-K5 Cap Seat KIT of 5
3
NEP-55-K5 Ring Gasket KIT of 5
4See Chart.1 Air Cap
5See Chart.2 Fluid Tip
6NEP-7P
Baffle Assy
7NEP-8-K5 Baffle Gasket KIT of 5
8NEP-35P
Fluid Inlet
9N/AGun Body
10 NEP-44P
Pattern ValveQTY Ref No.
Part No.
114NEP-12
15See Chart.2
16NEP-14-K5
117
NEP-13
118
NEP-463119----20
NEP-45-K5
121
NEP-108122
NEP-45-K5
123
NEP-30

11NEP-443-3P Air Seal Kit

124

SN-26-K4

1213

NEP-43
Air Valve
NEP-25-K5 Valve Spring kit of 51125

NEP-42

3

Description
QTY
Air Valve Bushing
1Needle1Needle Spring Kit of 5
1
Needle Adjustment Knob
1
Needle Packing Kit
1Needle Packing
Bearing Stud Kit of 5
1Trigger
1
PLUG
1
Air Connector
1Color ID Ring Kit
1(4 Colors)
Cheater Valve (option)-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 ofrespiratory 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. Theuse 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.

3.

Adjust Needle Packing(19) before start using new gun. Tighten the Needle Packing kit(18)gradually and then to adjust the needle moving smoothly, untighten until the Needle(15) is not wellpulled back.

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, good result
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 the gun
body in solvent as any solids may get into the air passage and cause troubles.

3.

Clean the spray gun after used with clean solvent and empty the inside of the hose.
To clean the fluid passage, after removing extra paint, through the appropriate 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, vegetablenot repelling materials).

7.

The following portions should be lubricated regularly; Bearing Stud (20), Pattern Valve (10),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) andthread 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.

Fluid Inlet (8) and Air Connector (23)
Fluid Inlet(8) and Air Connector (23) are 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)When disassembling and reassembling Pattern Valve (10) , turn the knobs completelycounterclockwise 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 (21), 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 (20) and Trigger (21) 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 (20) and Trigger (21) 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

Correction

No pressure to gun.

Check air and material lines.

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

Jerky or fluttering
spray

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

C,D : Incorrect fluid delivery or viscosity.

C,D : Adjust.

Insufficient material in the cup or Looseconnector.

Fill cup or tighten the Connector.
Clean.

Gun material passage plugged.
Replace.
Worn Needle Packing (19).
Tighten or replace.
Fluid leaking fromNeedle Packing Kit(18)
Dripping from fluidtip(5)Loose or damaged Fluid Tip (5).
Loose of Needle Packing Kit (18)Worn or damaged Needle Packing (19).
Wor n o r damag ed Fluid Ti p (5) o r
Needle (15).

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

Stuck Needle Packing (19) or Needle (15). Lubricate.
Incorrect adjustment of Needle Packing Kit Hold the end of the Needle (15)(18)
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.

Description

KB-555
DPT-20H

Pressure Cup (2 Quart)
Pressure Tank (20L)

HGB-509
QDL-4808

Fluid Regulator
Quick Joint (3/8 PF F)

HC-4691DAH-10

Quick Joint (3/8PF M)
Air Hose Set (10m, G1/4 nut on both sides)

DPH-10-2
DTW-2-3

Fluid Hose Set (10m, G1/4 nut on both sides)
Twin (Air/Fluid) Hose Set (2m)DTW-6-3
DTW-10-3

Twin (Air/Fluid) Hose Set (6m)
Twin (Air/Fluid) Hose Set (10m)

HAV-503-B
SSL-10Air Adjusting Valve with Gauge
Gun Lube (60ml)

42884-214-K5
AD-404-J

Cleaning Brush (kit of 5)
Adapter (1/4 PF M, 3/8 PF F)

2020.03-NEPTUNE-C-E01

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