Maintenance
17
6.
Attach
the
Band
Clamp
(3).
7.
Tighten
the
10
‐
32
screw
(2)
securing
the
band
clamp
to
the
output
end
cover.
See
8.
(Model
8325)
Tighten
the
compression
nut
(1)
connecting
the
pressure
relief
tube
to
the
expansion
tank
using
a
7/16
inch
wrench.
Replace Coolant Tank Input O-ring Seal
To
change
the
input
o
‐
ring
seal,
the
output
end
cover
must
be
removed
and
the
coolant
drained
from
the
coolant
tank.
1.
Remove
the
output
end
cover.
See
2.
Carefully
pour
the
coolant
into
a
clean
container.
If
the
coolant
is
uncontaminated
it
can
be
reused,
otherwise
discard
it.
3.
Loosen
the
10
‐
32
screw
(1)
securing
the
band
clamp
to
the
RF
input.
See
.
Figure 5 Input O-Ring Removal
4.
Remove
the
Band
Clamp.
5.
Lift
the
RF
input
section
out
of
the
attenuator
assembly
far
enough
to
remove
the
o
‐
ring.
If
replacing
the
entire
RF
Assembly,
completely
remove
assembly
from
the
coolant
tank.
6.
Remove
the
o
‐
ring
seal
from
the
input
of
the
RF
Assembly.
7.
Inspect
the
input
o
‐
ring
seal.
The
o
‐
ring
should
be
soft
and
pliable,
and
free
of
surface
cracks.
If
damaged
or
hardened
the
o
‐
ring
should
be
replaced.
See
.
8.
Install
o
‐
ring
seal
on
the
RF
input
section.
9.
Press
the
RF
Input
section
into
the
attenuator
until
seated
against
the
coolant
tank.
10. Attach
the
Band
Clamp.
11. Tighten
the
10
‐
32
screw
(1)
securing
the
band
clamp
to
the
RF
input.
See
.
