- DA-300 LVMP AUTOMATIC SPRAY GUN Operation Manual [ Japanese ]
Important：Read and follow all instructions and SAFETY PRECAUTIONS before using this equipment.
DESCRIPTION
DA-300 LVMP gun is developed to achieve high transfer efficiency and it can be obtained as well as high atomization with less
air consumption. LVMP stands for Low Volume Medium Pressure.
Small, lightweight LVMP gun is suitable for installing to automatic or semi-automatic machines.
Models and application information follows.
MODELS
Example: DA － 300 － 3□□ － □□□
Basic Part No. Fluid Tip Size 0.8, 1.1, 1.4, 1.8 mm
Air Cap No. 305MT, 307MT, 345
NOTE: The fluid passage is made of Stainless Steel. This gun can be used with waterborne paint.
Chart 1
Air Cap Fluid Tip Size
(mm)
Pattern Size Shape Typical Applications
Marking Part No.
305MT JJ-3-305MT 0.8, 1.1, 1.4, 1.8
250mm
Straight
Most conventional materials
307MT JJ-3-307MT 0.8, 1.1, 1.4, 1.8
300mm
Straight
Most conventional materials
345 JJ-3-345 0.8, 1.1, 1.4, 1.8
320mm
Straight
Most conventional materials
Chart 2
Air Cap Tip Marking (mm)
Part Number
Lapped Set (Tip & Needle)
305MT,
307MT
345
0.8 DA-430-0.8
1.1 DA-430-1.1
1.4 DA-430-1.4
1.8 DA-430-1.8
DA-300 LVMP AUTOMATIC SPRAY GUN
Operation Manual
2
SAFETY PRECAUTIONS
This manual contains important information that ALL users should know and understand BEFORE using this equipment. This information relates to
USER SAFETY and PREVENTING EQUIPMENT PROBLEMS.
To help you recognize this information, we use the following terms to draw your attention to certain equipment labels and portions of this manual.
Pay special attention to any label or information that is highlighted by one of these terms:
WARNING Important information to alert you to a situation that might cause serious injury or loss of life if instructions are not followed.
CAUTION Important information that tells how to prevent damage to equipment.
NOTE Information that you should pay special attention to.
WARNING
The following hazards may occur during the normal use of this equipment. Please read the following chart.
HAZARD CAUSE SAFEGUARDS
Fire
Solvents and coatings can be highly
flammable or combustible, especially
when sprayed.
1. Adequate exhaust must be provided to keep the air
free of accumulations of flammable vapors.
2. Smoking must never be allowed in the spray area.
3. Fire extinguishing equipment must be present in the
spray area.
4. Static discharges must be prevented. Ground(earth)
all conductive objects in the spray area, such as a
cleaning solvent bucket, fire extinguisher, etc.
5. When using solvents for cleaning:
• Those used for equipment flushing must have a
flash point equal to or greater than that of the
coating.
• Those used for general cleaning must have flash
points above 100°F (37.8°C).
Inhaling Toxic Substances
Certain materials may be harmful if inhaled
or if there is contact with the skin.
1. Follow the requirements of the Material Safety Data
Sheet supplied by coating material manufacturer.
2. Adequate exhaust must be provided to keep the air
free of accumulations of toxic materials.
3. Use a mask or respirator whenever there is a
chance of inhaling sprayed materials. The mask
must be compatible with the material being sprayed
and its concentration. Equipment must be as
prescribed by an industrial hygienist or safety expert,
and be NIOSH approved.
Explosion Hazard –
Incompatible Materials
Halogenated hydrocarbon Solvents- for
example:
methylene chloride and
1,1,1-Trichloroethane are not chemically
compatible with the aluminum that might be
used in many system components. The
chemical reaction caused by these
solvents reacting with aluminum can
become violent and lead to an equipment
explosion.
This spray gun can be used with these solvents.
However, aluminum is widely used in other spray
application equipment – such as material pumps, cups,
regulators, valves, etc.
Check all other equipment items before use of these
solvents. Read the label or data sheet for the material
you intend to spray. If in doubt as to where or not a
coating or cleaning material is compatible, contact your
material supplier.
General Safety Improper operation or maintenance may
create a hazard.
Operators should be given adequate training in the safe
use and maintenance of the equipment (in accordance
with the requirements of NFPA-33, Chapter 15 in U.S.).
Users must comply with all local and national codes of
practice and insurance company requirements
governing ventilation, fire precautions, operation,
maintenance and housekeeping (in the U.S., these are
OSHA Sections 1910.94 and 1910.107 and NFPA-33).
Noise Levels
The continuous A-weighted sound pressure
level of this spray gun may exceed
85dB(A) depending on the air cap/nozzle
set-up being used. Sound levels are
measured using an impulse sound level
meter and analyzer, when the gun is being
used in a normal spraying application.
Details of actual noise levels produced by
the various air cap/nozzle set-ups are
available on request.
Wear earplugs when using the spray gun.
3
HAZARD CAUSE SAFEGUARDS
Spraying solvent
Pressured air/fluid passages may be
broken when cleaning or flashing with
solvent.
The solvent may be harmful if contacted
with eyes.
Always wear eye protection when spraying or cleaning
the equipment.
Misuse:
• All spray guns project particles at high velocity and must never be aimed at any part of body.
• Never exceed the recommended safe working pressure for any of the equipment used.
• The fitting of non-recommended or non-original accessories or spare parts may create hazardous conditions.
• Before dismantling the equipment for cleaning or maintenance, all pressures, air and material must be isolated and released.
Disposal of non-metallic materials must be carried out in an approved manner. Burning may generate toxic fumes.
The removal of waste solvents and coating materials should be carried out by an authorized local waste disposal service.
SPECIFICATIONS
Max. Air Pressure 0.69MPa (6.9 bar)
Max. Fluid Pressure 0.69MPa (6.9 bar)
Cylinder Air Pressure Min. 0.35MPa (3.5 bar)
Max. 0.50MPa (5.0 bar)
Weight 507g
Gun Stud Diameter 16.0mm
Fluid Thread G1/4 (M) CAP Thread: G1/4 (M)
CYL Thread G1/4 (M)
INSTALLATION
Figure 1. Dimensions
Mount the gun with the set screw (22).
NOTE:
The air supplied to the gun should be clean air that removed any impurities. Also, the air hose should have enough inner
diameter depending on the length to supply necessary air.
OPERATION
1. Mix, prepare and strain the coating material to be sprayed according to paint manufacturer’s instructions.
2. Adjust the CYL air at 0.35 MPa ~. Please use air regulator for setting the air pressure for the smooth movement of CYL.
3. Turn Needle Adjusting Knob counter-clockwise 3.5 turns from fully closed position. This makes the Needle fully opened.
4. Adjust CAP air at 0.20MPa~0.25MPa.
5. Adjust fluid pressure at about 0.07Mpa~0.1Mpa.
6. Turn on CYL air and test spray. Adjust fluid and air pressure until desired pattern is obtained. Pattern size can be adjusted
by using pattern valve (5). Control fluid pressure at supply source. Always attempt to keep CAP pressure as low as possible
4
to minimize overspray and control the air at air supply source.
WARNING
Risk of injury. Equipment and fluid may be under pressure. Pressure in the system must be relieved before beginning the
cleaning procedure and before replacing any parts. Follow the procedures in the literature provided with the system.
CLEANING
1. Relieve air pressure from pressure tank. Carefully follow instructions in bulletin sent with tank.
2. Replace material in container with a suitable solvent.
3. Repressurize system.
4. Trigger gun and repeat procedure until gun and hose are thoroughly clean. A SolventSaver TM type hose and gun cleaner
which supplies a mixture of air and solvent can be used to most effectively clean gun and hose internal passages. See
Accessories for SolventSaver™ .
5. Wipe exterior of gun with a solvent dampened cloth.
CAUTION
Do not totally submerge gun in solvent. It is possible for wash solids to flow into air operating sections of gun which could
seriously damage piston O Ring seals.
CAUTION
The air cap can be immersed in solvent for cleaning and brush the gun. If orifices are clogged, use a broom straw or
toothpick to remove obstruction. Never use a steel wire or hard instrument. This will damage air cap and result in a distorted
spray pattern.
REPLACEMENT
Tools Required
Crescent Wrench or Spanner
19mm Box Wrench or Hex Wrench (for Item No. 4)
Pliers (for Needle Assy)
Large Minus Screw Driver
Fluid Tip, Fluid Needle (4), Needle Packing Kit (7)
1. Relieve all air and fluid pressure in system.
2. Remove Retaining Ring (1) and Air Cap (3).
3. Remove Fluid Tip (4).
4. Replace Fluid Tip and Needle at the same time with the lapped set. It is recommended to replace Needle Packing Kit (7)
at the same time as replacing the tip and needle.
5. Remove Ratchet Assy. (18) and Pull Needle Assy. out from gun body with Pliers.
6. Remove Cover (20), and then remove needle packing kit (7).
7. Reassemble in reverse order. It is recommended to put Gun lube (SSL-10) slightly between needle and needle packing.
(For solvent base paint)
8. Recommended torque of Fluid Tip: 10~11N.m.
Piston Cup (13), Air Valve (11), O-Ring (8), Gasket (9)
1. Remove Ratchet Assy. (18) and Pull Needle Assy. out from gun body.
2. Screw Needle (from the rear side) in Piston Cup (13) and pull Needle to take out Piston Cup.
3. Turn Air Valve (11) counter-clockwise with proper tool putting in the slot and remove it.
4. Remove O-Ring (8) and Gasket (9).
5. Wipe the inside of cylinder and clean it. Apply non-silicone grease lightly on O-Ring. (For solvent base paint)
6. Reassemble in reverse order.
Fluid Inlet (19), Air Connector (22)
1. When Remove Fittings and reassemble the gun, remove the sealing material from the gun body and fittings completely.
2. Put the new sealing material (Loctite 242, etc.) on the thread part of fittings when reassemble.
5
Figure 5. Gun Exploded View
Ref No. Part Number Description Qty Remarks
1 JJ-6 Retaining Ring (with seat) 1 With JJ-50
2 JJ-50-K5 Seat Kit of 5 1
3 See Chart. 1 Air Cap 1
4 See Chart. 2 Lapped Set (Fluid Tip & Needle) 1
5 DA-44 Pattern Valve Assy. 1
7 DA-463 Needle Packing Kit 1
8 DA-P9P16 O-Ring Kit 1
9 DA-12 Air Valve Gasket 1
10 DA-P10-K5 O-Ring Kit of 5 1
11 DA-43 Air Valve Assy. 1
12 DA-Y20-K3 Y-Packing Kit of 3 1
13 DA-9 Piston Assy. 1 With DA-Y20
14 DA-4993 Spring Kit 1
15 DA-46-K5 E-Ring Kit of 5 1
16 3/16BALL-K5 Ball Kit of 5 1
17 DA-34 Ratchet Spring 1
18 DA-402R Ratchet Assy. 1
19 DA-35 Fluid Inlet 1
20 DA-33 Cover 1
21 DA-2048 Set Screw 2
22 DA-30 Air Connector 2
23 PC6-02
PC8-02
Quick Fitting Joint O.D. 6 (24.7mm)
Quick Fitting Joint O.D. 8 (26.6mm)
1 Option
24 DA-432 Needle Adjusting Knob Assy.
Non-Ratchet type
1
6
SERVICE CHECK
problem Cause Correction
Will not spray. No pressure to gun.
Piston stops moving.
Check air and material lines.
Check CYL air pressure.
Improper spray pattern.
A. Gun not adjusted properly.
A, B. Material build up on the air cap (3)or fluid
tip (4).
A. Re-adjust. See Operation Section.
A, B. Clean the air cap or fluid tip.
See Preventive Maintenance.
Note
To determine where the material build up is, rotate the air cap 180°and test spray. If the pattern
stays in the same position, the condition is caused by material build up on the fluid tip. If the pattern
changes with air cap movement, the buildup is in the air cap.
C, D. Wrong material or material too thick.
Insufficient material or atomizing air
pressure too high.
C, D Adjust material pressure or thin material.
Increase material or reduce atomizing
air pressure.
Jerky or fluttering spray
1. Insufficient material in the tank or an obstruction
in the line.
2. Gun material passage plugged.
3. Worn Needle Seal Kit (7).
4. Loose or damaged fluid tip.
1. Fill tank or clear obstruction.
2. Clean.
3. Replace.
4. Tighten or replace.
Air leaking from
Ratchet Assy. (18).
1. Damaged or worn Piston Cup (12).
2. Damaged cylinder of Gun Body.
1. Replace.
2. Replace.
Dripping from Fluid Tip. 1. Worn or damaged Fluid Tip (4) or Needle (4).
2. Needle Spring (14) damaged or deformed.
1. Replace.
2. Replace.
Air or fluid leaking from
Gun Body.
Damaged or worn Needle Seal Kit (7) Replace.
ACCESSORIES
OM_AG_DA300-E1_2025.04
Part No. Description
SSL-10 Gun Lube (60m)
42884-214-K5 Cleaning Brush (Kit of 5)
AGA-415 Universal Clamp
GC-100-K48 Gun Cover (Kit of 48)
HD-505 Quick Cleaner (5)
83GZ-5200 Solvent Saver (10)
Normal spray pattern
The proper combination of fluid pressure, fan and atomization air pressure,
and fluid tip size should result in a pattern of this shape.
