5-10. Mechanical Filter (Figure 5-6). To change the
mechanical filter’s head and element proceed as follows:
Make certain that all air pressure has
been relieved from the compressor air
supply
system
by
opening
the
mechanical filter drain valve, dehydrator
bleed valve and service hose bleed
valve.
a.
Disconnect
mechanical
filter-to-dehydrator
number one tube assembly at tee on mechanical
filter.
b.
Unscrew nipple from mechanical filter. Remove
nipple, check valve, and elbow, as an assembly
from mechanical filter.
c.
Place a short bar or similar tool between the
head studs for leverage and unscrew the head
and element from cylinder.
d.
Thoroughly clean the inside of the cylinder, using
a lint free cloth and a hot water and detergent
solution per Federal Specification P-D-220.
Allow cylinder to air dry.
Figure 5-7. Ten Micron Air Filter
When installing new element, make
certain that the head is started into
cylinder squarely so that o-ring, supplied
with the new element, is not damaged.
e. Discard head and element and install a new head
and element.
Screw the element into cylinder for a
firm fit only. Sealing is accomplished by
the o-ring seal, not by tightening. The
leverage bar is used only as a wrench.
f. Screw the element and head firmly into cylinder.
When installing pipe fittings in high pressure points in the
system, use antiseize tape, MIL-T-27730, or equivalent
on threads. Use only one wrap of the tape and do not
overlap ends. Wrap back from fitting end approximately
two threads to prevent cut bits of tape from entering the
air system which will plug filters or small orifice holes
within the system.
g. Remove old antiseize tape from elbow and nipple.
Wrap elbow and nipple with antiseize tape, per Military
specification MIL-T-27730.
h. Screw nipple, check valve, and elbow, as an
assembly, into filter head.
i. Reconnect mechanical filter-to-dehydrator number one
tube assembly to elbow.
5-11. Ten-Micron Filter (Figure 5-7). To change the ten
micron filter’s element, proceed as follows:
Make certain that all air pressure has been relieved from
the compressor air supply system by opening the
mechanical filter main valve, dehydrator bleed valve and
service hose bleed valve.
5-8
