Maintenance Instructions - MW TOOLS CAT420 Mode D'emploi

TOOLS
3 Operating instructions
1. Preparing parts for blasting
All parts processed must be free of oil, grease and moisture. Make sure parts are dry before putting into the cabinet
for cleaning.
2. Air pressure
Operating pressure: from 50 to 80 psi/3.45 to 5.51 bar. Higher pressures (maximum 125 psi/8.61 bar) can be
used but this breaks down some types of media's prematurely (ex. glass beads).
- Set air pressure to 80 psi/5.51 bar. Most parts for blast cleaning can be blasted at 80 psi/5.51 bar. For light
gauge steel, aluminium and other more delicate parts, start at lower pressure and gradually increase the pressure
until the desired finish is achieved.
Warning: Do not connect to high pressure bottle gas, rupture and explosion can occur.
3. Gun angle and distance
Direct gun at parts at 45-60 degree angle with ricochet towards the back of the cabinet. Do not hold gun at 90
degree angle to parts being processed. This will cause the media blast to bounce back into the blast stream and
slow blasting action. Also 90 degree angle will cause excessive wear on gun and viewing window. Hold gun
approximately 6 inches/15 cm from parts being blasted.
Warning: Gun must always be pointed away from the operator and towards items being
processed. Never blast with any of the cabinet doors open. While loading and unloading, no
one should be at the operator station, at the front of the blast cabinet.
Cabinets are available with safety doors so that the gun cannot be operated unless the doors are closed. Contact
your dealer for further information.
4. Media
Media should be of good quality and dry. Moisture will cause the media not to flow and will clog metering valve
and hopper.
Never use sand.
There are many types and sizes of media for different finishes. If you are having a problem selecting a media for a
specific job, contact your distributor for recommendations.
5. Metering valve
The metering valve adjusts the amount of media being pulled into the gun. This valve, located at the bottom of the
hopper, has the media stored on top of it. When the air is sent to the gun from the foot pedal a vacuum is created
that sucks air and media up into the gun through the clear media hose. A 7/6" bolt on the top of the metering valve
can be adjusted to vary the amount of air that is sucked in through the holes. If the holes are too far closed, the
mixture will have too much media and the gun will pulsate. If the holes are too far open, too little media will go to the
gun and production will decrease.
6. Nozzle size
By changing to the next larger size of nozzle, production can increase significantly. Larger sized nozzles produce a
larger cleaning pattern. This, however, requires more air (your compressor must be able to provide this).

4 Maintenance instructions

1. Blasting gun
After 10-12 hours of blasting time, the nozzle should be checked. If it shows uneven wear it should be turned 1/4
turn every 10 hours of use.
2. Caking of media
Media caking is caused by moisture in the air supply or from oily and greasy parts. If this is not corrected, media
will not flow evenly and will plug up in the metering valve and the gun. Check air supply; if water is present, install a
good moisture trap. If oily or greasy parts are being blasted, you should degrease and dry the parts first.
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M1.2.CAT420.NLFREN 24092018
EN