Grex Power Tools X1000 User Manual

Grex Power Tools Tools

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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.


Turn off the air and fluids to the gun and release pressure by triggering the gun before disassem-

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


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
: 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
: 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.


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.


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.









Technical Specifications

Operating Instructions

Maintenance Information

Troubleshooting Guide

Parts Diagrams

Large Format Spray Gun