DirectFlo DF1400
Chapter 4: Maintenance
Comco Inc.
4-6
Issue Date: January 2009
Parts Subject to Normal Wear
(cont’d)
Modulator
The modulator is an electro-mechanical device that is activated each time the footswitch
is depressed. The stop/start action of the modulator contributes to a consistent flow of
abrasive powder from the tank into the mixing chamber and out the nozzle. The
principles of operation are described in detail in Chapter 1 of this manual.
Due to its constant movement and its close proximity to the abrasive in the mixing
chamber, the mechanical part of the modulator, the modulator housing assembly, is
considered a wear point and should be inspected on a regular basis. The frequency,
with which the modulator should be inspected, depends on machine usage. Applications
that include heavy use, or very aggressive abrasives, may require checking the
modulator on a monthly basis. In normal use, or mild abrasive applications, inspection
should be done every six months. It is recommended to replace the modulator housing
assembly every 2000 hours of operation, which is approximately one year of normal
operation. See Chapter 5 for inspection and repair procedures.
