| Airless Paint Sprayer |
By The Editors of RenTrain
(NOTE: After reading this article, you may want to take a test on its content. To do so, follow this link: Airless Paint Sprayer Safety Test)
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Operating Instructions
Setting Up to Spray- 1. Be sure motor switch is in "OFF" position. Plug unit into ll5V, 15 amp, grounded circuit. NOTE: If using an extension cord, you MUST use a #14/3-wire grounded cord, up to 50 feet or a #12/3-wire grounded cord, up to 100 feet. DO NOT exceed 100 feet of extension cord. If distance is greater, purchase and install additional lengths of airless spray hose.
- Turn motor switch "on".
- Turn prime valve knob counter clockwise until fully open. Allow thinner to circulate back into the siphon pail for a few minutes. Then turn prime valve knob clockwise to close the valve (close tightly), and direct the flow to the paint hose and gun. Leave the pressure setting low.
- Trigger gun into waste container.
- Pour paint through strainer bag into siphon pail.
- Repeat steps 4 and 5, until paint flows freely. NOTE: Never turn prime valve back to "prime" position when the unit is under pressure.
- Spray a test pattern. Begin by spraying a test pattern onto old newspaper or other scrap material. Increase the pressure, slowly at first, by turning the pressure control knob clockwise. Continue increasing the pressure until the spray pattern is uniformed from top to bottom, with no heavy areas. If heavy areas are still visible at maximum pressure setting, thin the paint with the correct thinner, according to the paint manufacturer's recommendations.
- Spray paint.
Untitled DocumentSpray Tip Selection Chart | Tip Size | Application | .018 | Interior Latex, exterior latex, shake paint, exterior flat paints. | .015 | Alkyd flat enamel, interior latex, semi-gloss enamel, stains. | .013 | Fine ground gloss enamels; good quality stains. | .011 | Clear varnishes and lacquers. | .009 | Clear varnishes and lacquers. |
Flushing the Unit at Shutdown or Color Change
If shutting down for a short period of time, it is sufficient to trigger the gun to relieve pressure. Then set the safety lock on gun to "locked" position with the gun locked closed and immerse the gun in a container of correct thinner for paint you are spraying. If shutting down at job completion, for the night, or to change colors:- Turn pressure control knob counter clockwise to low pressure setting.
- Remove siphon assembly from paint container.
- Trigger gun, back into paint container, until unit runs dry.
- Place siphon assembly in container of correct thinner, and prime the pump. Allow thinner to circulate back into the container for a few minutes to flush the prime valve.
- Trigger gun into waste container until thinner comes through clear.
- Lift siphon assembly and allow pump to run dry.
- Repeat procedure using a gallon of washing solution.
- Switch unit "off" and trigger gun to relieve remaining pressure. .
- Remove and rinse gun handle filter in correct thinner.
Special Notes and Instructions
- NEVER leave the unit under pressure when not spraying (motor turned off). Relieve pressure by triggering gun. NEVER store unit with paint
or water in pump system, even overnight.
- NEVER attempt to start the motor when the unit is under pressure. Relieve pressure and follow instructions in "Setting up to spray"
- NEVER attempt to run the motor on longer or lighter extension cord than specified.
- If motor's thermal overload switch has opened, unplug unit and allow it to cool.
- DO NOT attempt to resume spraying before determining and correcting the cause of overheating.
- If you wish to power the unti with a generator, it must be a 3500 watt minimum, in good operating condition. NOTE: An electric tool must be powered by a generator with an output wattage of at least three times maximum draw of motor under full load.
- Always follow flushing and cleaning instructions exactly.
- In hot weather, locate unit in shade.
- Regularly check level of hydraulic fluid in hydraulic tank. It should be kept near full. Top up as needed.
- Crankshaft eccentric bearing should be greased at regular intervals consistent with hours of use. Use MO-2 grease (ie. common auto grease) approximately every 10 hours of operation.
- Avoid operating the unit while tilted. Keeping it level assures greater operating efficiency.
IMPORTANT SAFETY PRECAUTIONS
NEVER- NEVER PUT FINGERS NEAR SPRAY TIP NOR AIM GUN TOWARD ANY PART OF THE HUMAN BODY.
- NEVER ATTEMPT TO STOP LEAKAGE WITH YOUR HAND OR ANY PART OF YOUR BODY. IF A LEAK OCCURS IN THE PAINT HOSE OR AT ANY FITTING, IMMEDIATELY SHUT OFF THE UNIT
- NEVER OPERATE THE SPRAYER WITHOUT THE TIP GUARD COMPLETE AND IN PLACE.
- NEVER SPRAY IN THE VICINITY OF OPEN FLAME, PILOT LIGHTS, ELECTRICAL OUTLETS, OR ANY OTHER SOURCE OF IGNITION.
- NEVER SPRAY VOLATILE MATERIALS WITH FLASH POINTS LOWER THAN 140° F 60° C).
- NEVER WASH AN ELECTRIC MOTOR DRIVEN UNIT, NOR OPERATE IT IN THE RAIN OR DAMP AREAS.
SURFACES.
- NEVER ALLOW PAINT HOSE TO BECOME KINKED, OR TO VIBRATE AGAINST ROUGH OR SHARP
SURFACES.
- NEVER SPRAY IN AN ENCLOSED AREA THE SPRAYING AREA MUST BE WELL VENTILATED TO SAFELY
REMOVE CHEMICAL VAPORS.
- NEVER LEAVE THE UNIT UNATTENDED WITHOUT FIRST SHUTTING OFF, TRIGGERING THE GUN TO RELIEVE ALL PRESSURE AND SETTING TRIGGER LOCK ON THE GUN IN THE "LOCKED" POSITION.
ALWAYS- ALWAYS FOLLOW ALL SAFETY PRECAUTIONS AND OPERATING INSTRUCTIONS COMPLETELY.
- ALWAYS ENSURE THAT THE MOTOR SWITCH IS IN THE "OFF" POSITION BEFORE PLUGGING IN ELECTRIC UNITS.
- ALWAYS CHECK CONNECTIONS AND FITTINGS FOR TIGHTNESS BEFORE OPERATING THE UNIT.
- ALWAYS LOCATE UNIT IN A WELL-VENTILATED AREA, A MINIMUM OF 25FT. FROM THE SPRAYING AREA
- ALWAYS USE APPROVED 3-PRONG GROUNDED EXTENSION CORD AND APPROVED GROUNDED OUTLETS OF THE VOLTAGE AND FREQUENCY SPECIFIED ON MOTOR. OUTLET MUST BE AT LEAST 25-FT. FROM THE SPRAYING AREA
- ALWAYS GROUND THE UNIT, PAINT CONTAINERS, AND OBJECT BEING SPRAYED TO ELIMINATE STATIC DISCHARGE
- ALWAYS WEAR A FACE FILTER MASK AND SAFETY GLASSES WHEN OPERATING THE UNIT.
- ALWAYS ENSURE THAT FIRE EXTINGUISHING EQUIPMENT IS READILY AVAILABLE IN THE SPRAY AREA
- ALWAYS OBSERVE GOOD HOUSEKEEPING AND KEEP THE SPRAY AREA FREE FROM OBSTRUCTIONS.
- ALWAYS BE AWARE THAT CERTAIN CHEMICALS MAY REACT WITH ALUMINUM, CARBIDE, OR OTHER COMPONENTS IN THE PUMP SYSTEM.
DON'T TAKE CHANCES! READ THE MATERIAL MANUFACTURER’S RECOMMENDATIONS. IF IN DOUBT, CONSULT YOUR MATERIAL SUPPLIER TO BE SURE.
Never Treat Any Injection Injury as a Simple Cut. If Injury Occurs, Obtain Immediate Attention. Be Prepared to Inform the Doctor What Fluid Was Injected.
Airless Spray Painting Suggestions and Techniques
A good airless spray application is the result of many factors Surface preparation, which includes cleaning and de-greasing, priming, material compatibility, quality finish product and correct application technique, all are important to the finished results.
The key to all good applications is a good spray gun technique. The finished results are what the client will look at and base his opinion on. Your skill and abilities are as important as good equipment and good paint. Proper application techniques can easily be learned by using the following simple guidelines.
If you are not familiar with the basic spray techniques we recommend that you study this portion of the manual and practice the techniques shown. Practice your technique on scrap cardboard or old newspaper until you feel confident.
For excellent results, read and practice these techniques:- Always stain all paint through a stainer bag. The most common reason for airless sprayers to malfunction is foreign matter jamming the valves or plugging the tip. Always strain the paint before putting through the pump.
- Always spray at lowest pressure setting to provide a uniform spray fan. (fig. 1) See setting up to spray in the Application Page for this tool.

Adjust pressure contraol knob so that paint is completely atomized from the spray gun. Insufficient pressure will result in "tailing." Too much pressure will result in excessive tip wear and increase sprayer wear and tear.
- Always spray at right angles to the surface being sprayed. (fig. 2.). Angling or arcing the nozzle toward the surface will cause uneven coverage and excessive overspray.

- Always hold spray gun 12-15" from surface. (fig. 3.). Too close and the fan width will be reduced and material will be applied too heavily (runs). Too far from the surface and you will have excesssive overspray and light coverage (transparent).

- Always move the gun parallel to the surface being sprayed, at a consistent speed. This avoids uneven coverage (thick or thin areas).
- Always start the spray stroke before triggering the gun and release the trigger before completing the stroke. (fig. 4). This avoids heavy build-up of paint at either end of the spray stroke.

- Always lap your spray pattern by one half. (fig. 5). This assures full coverage of the surface being painted.

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