DirectFlo DF1400
Chapter 4: Maintenance
Comco Inc.
4-7
Issue Date: January 2009
General Maintenance
Tank Cover
The tank cover seals the abrasive tank and allows for replenishing the abrasive powder.
Always fill the tank through the flapper valve and refrain from removing the tank
cover unless absolutely necessary.
Whenever the tank cover is removed to change
powder, excess powder must be wiped off the top of the tank and the tank cover O-rings.
Always check to make sure the tank cover is firmly tightened. If the tank cover is not
firmly seated so that the O-ring seals properly, abrasive can be forced out by the system
pressure and seriously damage both the tank and tank cover. Inspect the tank cover
monthly for worn O-rings (4 places) and worn Feedthru Bushings (2 places).
Cabinet and Cables
At six-month intervals, unplug the power cord and inspect it for cracks or cuts. Also
check the footswitch cable. Remove the cabinet cover and inspect the inside of the
DirectFlo for obvious leaks. Clean thoroughly with a small brush and vacuum hose
(never use air or try to blow off abrasive).
Filter Bowl
The filter is part of the Air Pressure Regulator assembly and is designed to trap abrasive
that may othe
rwise be forced back into the “clean air” side of the DF1400, causing major
component failures. Check and empty the filter bowl (unscrew it) every six months. If at
any time the filter bowl is more than 1/4 full, it could be an indication of a check valve
failure and the whole regulator assembly may need to be replaced. See Chapter 5
–
“Check Valve”.
Leaks
During normal operation, air may be used at the rate of 3 to 6 cubic feet per minute,
depending on nozzle size and air pressure. Small leaks can increase air usage
considerably and reduce the efficiency of the DirectFlo. A large drop in air pressure
while the machine is operating might be an indication of an air leak.
Leaks usually begin to occur first in the tank cover O-rings. Inspect the O-rings often
and make sure the cover is firmly sealed. See the previous discussion on “
Tank Cover
”,
in this chapter. See Chapter 5 for further information on leaks.
