MARSHALLTOWN WS3650 WAL PRO Hopper Gun Instruction Manual

THE WAL-PRO® HOPPER GUN IS A PRECISION TOOL
WS3650 WAL PRO Hopper Gun
Instruction Manual

CAUTION: ALWAYS WEAR APPROPRIATE PROTECTIVE DEVICES, INCLUDING EYE PROTECTION

INCLUDED IN BOX:

• Gun Assembly
• Hopper
• Small, Medium & Large Material Orifices
• Air Shut-Off Valve & Quick Disconnect
• Hopper Clamp

ASSEMBLY

1. Determine the type of compressor you will be using. For use with a Rotary Vane Compressor, thread the Quick Disconnect (40189) into the bottom of the gun handle. For use with a Piston/Tank Compressor, first thread the Air Shut-Off Valve (40198) into the bottom of the gun handle and thread the Quick Disconnect into the Air Shut-Off Valve.
   CAUTION: The Air Shut-Off Valve should only be used with a compressor that has a pressure switch for controlling on/off functions. Improper usage may result in damage to your equipment and personal injury.

2. Attach the hopper gun to the gun body by placing the hopper upside down on the floor or a table. Place the hopper clamp over the neck of the hopper. Position the gun body so the handle is facing toward the rear of the hopper and push down firmly until it is sealed. Tighten the hopper clamp.

SET-UP

Mask off areas you don’t want textured and use heavy-duty drop cloths to protect floors, furniture, etc. Plan how you intend to move during spraying and remove any obstacles in your path. Mix enough material to complete the job or section before starting to spray.

TEXTURE TABLE
This table shows the basic parameters in preparation for spraying. We recommend that you spray test panels using drywall, plywood, or cardboard. Use a compressor that produces 7 CFM at 25 PSI. The air supply must be consistent, or the texture pattern will change accordingly.

DESIRED PATTERN| MATERIAL THICKNESS| MATERIAL ORIFICE| AIR PRESSURE| TRIGGER DISTANCE
---|---|---|---|---
Light Splatter| Thick Paint| Small| 23-25 PSI| 1/3
Orange Peel| Thick Paint| Medium| 20-23 PSI| 1/2
Medium Splatter| Thick Paint| Medium| 17-20 PSI| 2/3
Heavy Splatter| Pancake Batter| Large| 10-15 PSI| Full
Acoustic| Manufacturer’s Spec| Large| 17-20 PSI| Full

MIXTURE THICKNESS: If you are using commercially available wall or ceiling texture mix, follow the manufacturer’s instructions. If you are thinning down all-purpose joint compound or topping mix, you will want a mixture thickness as described above.
MATERIAL ORIFICE: The smaller the material orifice, the finer the texture pattern. The larger the material orifice, the larger the texture pattern. You should always use a large material orifice with acoustic material.
ATOMIZING PRESSURE: A lower PSI will produce a heavier texture, and an increase in pressure will produce a finer texture. The range in pressures will generally be between 10 – 30 PSI.
TRIGGER PULL DISTANCE: If you have consistent air supply and air pressure, adjusting the trigger pull distance allows for the fine control of the texture pattern. To adjust the trigger pull distance, turn the knurled knob on the back of the gun clockwise or counterclockwise. Maximum adjustment is 7 turns or when the trigger touches the handle when pulled. Applying a consistent trigger pull distance is critical to consistent texture patterns.
TEXTURING – VERTICAL SURFACES (WALLS)

1. Fill the hopper 2/3 to 3/4 full with texture material.
2. Start the compressor and open the shut-off valve, if installed, allowing air to discharge through the hopper gun.
3. Stand 3 to 4 feet from the surface to be textured (except horizontal surfaces).
4. Lift your hopper gun toward the top of the surface to be sprayed (at a corner or edge).
5. Pull the trigger and start moving vertically down the surface until you are near the bottom.
6. Without stopping, move sideways and start up the surface vertically, until you are near the top.
7. Without stopping, move sideways and start down the surface vertically, again.
8. Repeat until all the desired surfaces have been sprayed. Refill the hopper as necessary.

If a knockdown texture is desired, wait until the top of the texture pattern changes from glossy to dull (normally 15 to 20 minutes) and gently flatten the texture with a WAL-BOARD knockdown knife, taping knife, or trowel.
TEXTURING – HORIZONTAL SURFACES (FLAT CEILINGS)

1. Fill the hopper 2/3 to 3/4 full with texture material.
2. Start the compressor and open the shut-off valve (if used) allowing air to discharge through the hopper gun.
3. Standing on the floor or other stable surface, lift the hopper gun until it is approximately 18″ below the ceiling. Angle the hopper gun toward the surface between 30 and 50 degrees.
4. Starting in a corner or edge, pull the trigger and move sideways until you reach the opposite corner or edge.
5. Without stopping, take a step backwards and move sideways in the opposite direction until you reach the starting corner or edge.
6. Repeat these procedures until you have textured the entire surface or are nearing a vertical surface.
7. If you are approaching a vertical surface, stop approximately 6 feet from the surface, turn around and repeat steps 3, 4, and 5.

PARTS BREAKDOWN

TO CLEAN

1. Flush out all remaining texture materials with water. Blow air through the gun to remove any texture materials or water that may have seeped into the air stem.
2. Turn the gun upside down and place 5 to 10 drops of light, lubricating household oil (such as 3 in 1®) in the Quick Disconnect with the Air Shut-Off Valve OPEN. This will allow the oil to lubricate the Air Stem and O-Rings.
3. After oiling, pull the trigger several times and close the shut-off valve for storage.

MAINTENANCE/DISASSEMBLE

1. Remove the Material Orifice.
2. Remove the Adjustable Stop by turning it counterclockwise until it is disengaged.
3. From the front of the gun, push the Air Stem toward the rear with your finger. The Air Stem may now be completely removed by pulling it out of the back of the gun.
4. To remove or replace the trigger, remove one of the two “E” clips and slide the trigger retaining pin to one side.

MAINTENANCE/REASSEMBLE

1. Prior to re-assembly, wipe a small amount of grease (such as a wheel bearing grease or any lithium-based grease) on the O-Rings of the Adjustable Stop Assembly and the Air Stem Assembly.
2. Slide the Air Stem into the gun body from the rear of the gun. CAUTION: Avoid damaging the O-Rings when reassembling the Air Stem. The O-Rings can rip on the threads or tear on the inside wall of the gun chamber.
3. Re-attach the Adjustable Stop by turning it clockwise until it is engaged (approximately 2 to 3 turns) and place the desired Material Orifice on the front of the gun and secure it with the Material Orifice Nut.

TROUBLESHOOTING

shut-off valve where the hose enters the gun to regulate and shut off the air. Caution: Use the shut-off valve only with an air compressor with a reserve tank and an automatic shut-off switch.
Material will not properly atomize or shoot out of the gun.| 1. Material is not properly mixed or thinned.
2. The compressor does not have enough CFM/PSI.| 1. Thin all material per recommendations (See “Texture Table”).
2. Replace the compressor with one that delivers a greater available capacity and/or pressure. (The WAL-PRO® Hopper Gun requires 7CFM @ 25 PSI.)
The mud (liquid) separates from the Styrofoam while shooting ceiling acoustic.| 1. Incorrect product is being used.
2. The hopper neck is clogged.| 1. Ensure that the material purchased is for use with hopper guns and mix the material per the manufacturer’s instructions.
2. While spraying, continue to hold the trigger back and place your finger over the front of the material orifice. This will assist in unclogging the hopper neck and mixing the material.
Material is being blown around after reaching the wall or ceiling.| 1. The air pressure is set too high.
2. You are too close to the surface being sprayed.| 1. See the texture table for proper settings. If you are using a tank-type compressor, regulate the air through the compressor.
2. You should be 3 to 4 feet from walls. For ceilings, you should be 18″ below with the hopper angled upward at 30 to 50 degrees.
Excessive wear of material orifice.| 1. Use of a very abrasive material.| 1. Use Stainless Steel Material Orifice (40193) available as a special order part.

WARRANTY INFORMATION: WARRANTY FOR REPAIR OR REPLACEMENT ONLY.
DO NOT RETURN TO PURCHASING LOCATION.
Warranty/Parts assistance contact: 800-433-0320

WAL-BOARD TOOLS
www.walboardtools.com
Marshalltown, IA USA
800-888-0127
U.S. Patent No. 4863104, 2301178
WARNING: Cancer & Reproductive Harm – www.P65Warnings.ca.gov.
WS3650

Documents / Resources

| MARSHALLTOWN WS3650 WAL PRO Hopper Gun [pdf] Instruction Manual
WS3650 WAL PRO Hopper Gun, WS3650, WAL PRO Hopper Gun, PRO Hopper Gun, Hopper Gun, Gun
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References

• P65Warnings.ca.gov
• MARSHALLTOWN | WAL-BOARD TOOLS®

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