- NEPTUNE-L LVMP Operation Manual [ Japanese ]
using this equipment.
NEPTUNE-L LVMP
Operation Manual
2
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 .................................................................................................. 8
3
MODELS
NEPTUNE – L - Air Cap No. – Fluid Tip Size PT
(Ex.) : NEPTUNE-L-805MT2-11PT ← (805MT2 Air Cap - Size1.1mm)
SPECIFICATIONS
Maximum Working Air Pressure: 0.69 MPa, Maximum Working Fluid Pressure: 0.69 MPa
Weight: 350g, Fluid inlet : G3/8, Air inlet :G1/4
Chart. 1
Air Cap No.
Part Number
Type of Feed
Air consumption
Gun inlet pressure
Pattern width (mm)
805MT2
AV-1239-805MT2
Pressure
275ｌ/min
0.25MPa
230
807MT2
AV-1239-807MT2
290
Chart. 2
Fluid Tip
Part Number
Tip size (mm) Needle Part Number Application
NEP-4S-11 1.1
NEP-41P-FZ
(Common)
Automotive
Large-sized
Metal plate
NEP-4S-14 1.4
NEP-4S-16 1.6
PARTS LIST
Chart 3
Ref No. Part No. Description QTY Ref No. Part No. Description QTY
1 NEP-6 Retaining Ring 1 14 NEP-12 Air Valve Bushing 1
2 NEP-50-K5 Cap Seat KIT of 5 - 15 See Chart.2 Needle 1
3 NEP-55-K5 Ring Gasket KIT of 5 - 16 NEP-14-K5 Needle Spring Kit of 5 1
4 See Chart.1 Air Cap 1 17 NEP-13 Needle Adjustment Knob 1
5 See Chart.2 Fluid Tip 1 18 NEP-463 Needle Packing Kit 1
6 NEP-7P Baffle 1 19 ----- Needle Packing
7 NEP-8-K5 Baffle Gasket KIT of 5 - 20 NEP-45-K5 Bearing Stud Kit of 5 1
8 NEP-35P Fluid Inlet - 21 NEP-108 Trigger 1
9 N/A Gun Body 1 22 JUP-21 Plug 1
10 NEP-44P Pattern Valve 1 23 NEP-30 Air Connector 1
11 NEP-443-3P Air Seal Kit 1 24 SN-26-K4
Color ID Ring Kit
(4 Colors)
1
12 NEP-43 Air Valve 1 25 NEP-42 Cheater Valve (option) -
13 NEP-25-K5 Valve Spring kit of 5 1 -
4
SAFETY PRECAUTIONS
This manual contains information that is important for you to know and understand. This
information relates to USER SAFETY and PREVENTING EQUIPMENT PROBLEMS. Read and
follow SAFETY PRECAUTIONS before using this equipment.
■ FIRE OR EXPLOSION HAZARD
1. When spraying, adequate exhaust must be provided to keep air free of accumulations of
flammable 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 spray
area.
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 the
coating. Those for general cleaning must have flash points above 37.8°C (100°F) to
prevent 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 the
labels 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 and
maintenance of this equipment.
2. Pressured liquids may injure eyes. Do not point the spray gun to any person.
3. Pressure feed gun must not be used for gravity or suction feed gun.
4. Parts with compressed air may damage the human body. Connect air hoses tightly by
using 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. When
replacing 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. Eye
protection must be worn when repairing the spray gun.
6. Do not use the gun at no more than maximum working pressure (0.69MPa).
5
INSTALLATION
1. 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.
2. 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 well
pulled 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 are
clogged, 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 not
instructed. For lubrication, SSL-10 Gun Lube* is recommended (*sold separately, vegetable
not 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) 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.
6
REPLACEMENT OF PARTS
Before replacing gun parts, remove materials from the gun for cleaning. Then release the air
pressure 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 8Nꞏm 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 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 (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 the
exploded 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 then
tighten 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 using
the wrench.
7
SERVICE CHECKS
problem Cause Correction
Will not spray No pressure to gun.
Needle Adjusting Knob (17) not properly
adjusted.
Check air and material lines.
Adjust.
Improper spray pattern
A,B : Material build up on the Air Cap or
Fluid Tip.
C,D : Incorrect fluid delivery or viscosity.
A,B : Clean the Air Cap or Fluid
Tip.
C,D : Adjust.
Jerky or fluttering
spray
Insufficient material in the cup or Loose
connector.
Gun material passage plugged.
Worn Needle Packing (19).
Loose or damaged Fluid Tip (5).
Fill cup or tighten the Connector.
Clean.
Replace.
Tighten or replace.
Fluid leaking from
needle packing(19)
Loose of Needle Packing Kit (18)
Worn or damaged Needle Packing (19).
Tighten Needle Packing Kit (18).
Tighten or replace.
Dripping from fluid
tip(5)
Wor n o r damaged Fluid Ti p (5) o r
Needle (15).
Stuck Needle Packing (19) or Needle (15).
Incorrect adjustment of Needle Packing Kit
(18)
Loose Needle Adjusting Knob (17)
Replace.
Lubricate.
Hold the end of the Needle (15)
with your hand to adjust. Fix it but
leave some space so that it can
still move a little bit.
Adjust.
Normal spray pattern
8
ACCESSORIES
Part No. Description
KB-555 Pressure Cup (2 Quart)
DPT-20H Pressure Tank (20L)
HGB-509 Fluid Regulator
QDL-4808 Quick Joint (3/8 PF F)
HC-4691 Quick Joint (3/8PF M)
DAH-10 Air Hose Set (10m, G1/4 nut on both sides)
DPH-10-2 Fluid Hose Set (10m, G1/4 nut on both sides)
DTW-2-3 Twin (Air/Fluid) Hose Set (2m)
DTW-6-3 Twin (Air/Fluid) Hose Set (6m)
DTW-10-3 Twin (Air/Fluid) Hose Set (10m)
HAV-503-B Air Adjusting Valve with Gauge
SSL-10 Gun Lube (60ml)
42884-214-K5 Cleaning Brush (kit of 5)
AD-404-J Adapter (1/4 PF M, 3/8 PF F)
OM_HG_NEPTUNE-L-E01_2025.05
