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Congratulations on your purchase of the Grex X1000 Spray Gun; a multi-purpose, reliable and high
performance spray gun designed for the demanding professional. Precision machining and carefully
selected materials are employed in the manufacturing process of each Grex spray gun to insure
consistent high performance and adherence to Grex’s high quality standards. To maintain your
X1000 at its peak performance, proper care and attention must be observed.
Paint Preparation
Proper preparation and filtering of paint through a nylon mesh is recommended for best performance.
Paint should always be thinned with its proper solvent. It is best to prepare the paint relatively thin
and make repeated passes across the work to achieve the desired shade. This will also improve the
quality of your work and decrease the cleaning time of your spray gun.
Pattern Width Adjustments
Pattern widths produced by the spray gun are controlled by adjusting the distance the gun is held
from the work surface and adjusting the Fluid Adjustment Knob on the rear of the spray gun. Turning
the knob clockwise helps produce finer patterns, while turning the knob counter clockwise helps
produce wider patterns.
The gun should be held so that it is perpendicular to the surface of the work piece at all times. Then,
the gun should move in a straight and horizontal line. Arcing the gun causes uneven painting.
Your X1000 spray gun is a durable precision instrument and as with any precision instrument it is
susceptible to damage if handled improperly. It is essential to take care to prevent damaging the
components of this highly sensitive tool in order to assure its peak performance during its lifetime.
Proper maintenance of the X1000 spray gun demands appropriate cleaning and requires correctly
replacing and adjusting the parts. Daily and thorough maintenance of your spray gun will result in
spraying that is smooth, consistent and hassle-free.
Warning
Turn off the air and fluids to the gun and release pressure by triggering the gun before disassem
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bling, cleaning or servicing.
Pay attention when disassembling spray gun since you may be touching sharp internal parts.
Do not disassemble the spray gun without receiving enough knowledge and education about the
equipment.
Cleaning the Spray Gun
It is only necessary to clean areas of the spray gun which come in contact with paint namely, the paint
reservoir, around the tip of the needle and the head cap assembly. These areas must be kept clean
for optimum performance of the spray gun.
Before each use
At the beginning of every session, spray water or appropriate paint solvent through the spray gun to
make sure the tool is working properly.
Cleaning spray gun between color changes
Empty out remaining paint in the container and spray out any excess paint. Wipe off as much residual
paint as possible with a paper towel. Partially fill the paint reservoir with appropriate cleaning solution
and spray the cleaner at a heavy spray setting into a paper towel or similar material. Repeat rinse
and spray until spray gun is flushed free of color.
Periodic Cleaning
The cleaning procedures described above are recommended before intermittent breaks during your
work session to prevent paint from drying inside the spray gun’s internal parts. Always empty paint
out if the spray gun is not used for relatively long periods of time and spray appropriate cleaning
solution until the spray gun is flushed free of color. Blockages caused by dried paint are the biggest
problem when using a spray gun. Any time the spray gun becomes clogged, increase the air
pressure and spray appropriate cleaning solution through the spray gun for a short period of time.
After each use
At the end of every session, follow the same cleaning procedures as those described for cleaning
between color changes. Then remove and clean only those parts which come into contact with paint.
Remove fluid nozzle after removing fluid needle set or while keeping fluid needle pulled, in order to
protect seat section. Carefully wipe clean the needle, nozzle and needle cap assembly with the
appropriate cleaning solution. It is not necessary to dismantle the entire spray gun. While keeping
fluid needle set inserted, tighten the fluid needle packing set by hand. Then tighten gradually with a
spanner. Adjust packing set while pulling trigger and watch movement of fluid needle set, since too
much tightening will slow down movement of fluid needle and result in leakage from the tip of nozzle.
If tightened too much, turn counterclockwise to a sufficient position until the needle is not stuck and
there is no fluid leakage.
Before replacing the needle, apply a light coat of lubrication to the needle to facilitate smooth
triggering. After the spray gun parts have been removed and cleaned, they must then be carefully
replaced and adjusted in their designated positions. Failure to align each part correctly will prevent
the spray gun from functioning properly. In many instances, when a spray gun fails to perform
correctly, these problems result from improper cleaning and/or alignment of parts.
Caution: Never soak entire spray gun in any solvent and/or cleaning solution to avoid damaging of
o-rings and spray gun packaging. Never use commercial or other parts instead of Grex original spare
parts. Never damage holes of air cap, fluid nozzle and fluid needle.
Lubrication of Spray Gun
Caution: Do not use light machine oil or W-40 for lubrication. Doing so will cause the needle to stick
as it moves through the needle packing.
To insure smooth operation, lubricate the needle and trigger mechanism regularly. Periodically
remove the fluid needle and coat with high quality lubricant. Then wipe the needle with a soft clean
cloth, leaving a light coat of lubricant. Several drops of lube should also be placed in to the trigger
slot of the spray gun body to lube the trigger mechanism and air valve.
Caution: Do not over-lube the needle or the main lever mechanism. Doing so may transfer excess
lube into the nozzle causing severe paint flow problems.
Replacement Parts
Caution: If it is necessary to disassemble the spray gun DO NOT use pliers. In most cases, no tools
are required to disassemble the spray gun except those provided in the kit.
Even though Grex spray guns are manufactured with precision machining and high quality materials,
several delicate parts require replacement due to normal wear and tear. These include the fluid
nozzle, fluid needle and o-rings.
Fluid Nozzle –Before replacing the fluid nozzle, be sure that the needle is slightly pulled back in the
spray gun. Simply turn the width adjust knob counter-clockwise. Remove the needle cap and nozzle
cap then carefully unscrew the nozzle using the wrench supplied with your kit. Replace with a new
nozzle and reassemble the spray gun. Do not over tighten any parts of the spray gun.
Note: It is recommended to change the fluid needle at the same time to insure even wear
Fluid Needle – Grex needles are made of precision ground and hardened stainless steel and will
withstand prolonged use. However, because of their fine tip and long taper, they are easily subject to
physical damage. This is a highly delicate part and any small deformations to the needle tip will
compromise the performance of the spray gun. If the tip is severely bent, it must be straightened
before being removed to prevent damage to the fluid nozzle.
MAINTENANCE
Important
1. This gun should only be operated by adequately trained operators.
2. Ensure that the spray gun has not been damaged.
3. Only clean and dry air should be supplied to the spray gun.
4. When using the spray gun for the first time, adjust the fluid needle packing set for smooth movement.
Compressors and Air Pressures
Choosing an appropriate air compressor that can supply sufficient pressure for your X1000 spray
gun insures optimal operation and performance. Working pressures vary from 30 to 50 psi,
depending on the type of work being done and what textures are desired. In general, higher
pressures are needed to take full advantage of the versatile spray characteristics of the spray gun.
Viscosity of the paint also effects which pressures are ideal. In general, larger volumes and/or thicker
paints require higher pressures.
Assembling Spray Gun for Use
Attach an air hose to the compressor and spray gun. Adjust the air pressure according to type of
paint used and desired spray characteristics. Check for any air leaks from the compressor and/or air
hose. Fill the container with some cleaning solvent and securely attach the container to the spray
gun. Pointing the spray gun away from you, pull back on the trigger to open the nozzle of the airbrush
allowing cleaner to spray out.
Caution: The fluid nozzle and needle are very delicate parts. Even the slightest physical damage can
adversely affect the spray pattern.
GENERAL OPERATION
Fire or Explosion Hazard
Fluid and solvents can be highly flammable or combustible. Use in well-ventilated spray booths
and avoid any ignition sources such as smoking, open flames, electrical hazards, etc.
NEVER use halogenated hydrocarbon solvents. They can chemically react with aluminum and
zinc parts causing an explosion. Be sure that all fluids and solvents used are chemically
compatible with aluminum and zinc parts.
To reduce the risk of static sparking, grounding continuity to the spray equipment and object
being
sprayed must be maintained.
Misuse Hazard
NEVER point spray gun in the direction of human body.
NEVER exceed the maximum safe working pressure of the equipment.
ALWAYS release air and fluid pressures before cleaning, disassembling, or servicing. A ball
valve
installed near the spray gun is recommended to stop air supply in case of an emergency and to
prevent unintended operation.
Hazard created while coating materials are atomized and sprayed
Toxic vapors produced by spraying certain materials can create intoxication & serious damage
to
health. Always use the gun in well ventilated areas & wear protective eyewear, gloves,
respirator,
etc to prevent toxic vapors, solvents & paint from coming into contact with your eyes & skin.
Depending on the noise level due to operation, wear ear plugs if necessary.
Other Hazards
NEVER modify this product for any applications.
NEVER spray foods or chemicals through the spray gun.
If something goes wrong, immediately stop operation and find the cause. Do not use spray gun
until all problems have been found and solved.
SAFETY WARNINGS
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Technical Specifications
Operating Instructions
Maintenance Information
Troubleshooting Guide
Parts Diagrams
Large Format Spray Gun
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