Cessna T188C - Air Filler Valve; Electrically-Driven Agitator Installation; Description; Removal

MODEL
188
& T188
SERIES
SERVICE
MANUAL
the clamp
on reservoir
body lug.
19-53.
REMOVAL
AND
INSTALLATION.
d.
Connect
all lines
at reservoir.
a-
Remove
clamp
and
hose.
e. Fill
reservoir to
FULL mark on
dipstick with
b. Unscrew
filter
assembly from
coupler.
DEXRON-type
automatic
transmission
fluid, and
c. Reverse
preceding
steps
for installation.
pressurize
to 15
psi.
19-54.
ELECTRICALLY-OPERATED
SPRAY
VALVE
19-47.
RIGGING.
(See
figure
19-21,
sheet
9.)
SYSTEM.
(See
figure
19-24.)
a.
Remove
on-off
control
from
lever at
reservoir
An electrically-operated
spray
valve
is available
to
and shut
valve
off.
replace
the manual
valve
on the
remote
pump
spray
b.
Push bottom
of
on-off control
in
cockpit
to full-
system.
The
spray handle
and
push-pull
control
of
forward
position.
the
manual
system
are replaced
by an electrical
c.
Attach control
to
valve lever
at reservoir.
switch
mounted
on the control
stick.
The vernier
d. Check
operation
of control
for freedom
of move-
setting
of
the valve
is
accomplished
by
a stop
on the
ment.
valve actuated
from
the cockpit
through
a flexible
drive shaft.
19-48.
AIR
FILLER
VALVE.
Due
to the
deterior-
ating
effect
that
hydraulic
fluid has
on
rubber,
the
19-55.
REMOVAL
AND
INSTALLATION.
Figure
air filler
valve
should
be
inspected
under
criteria
19-24
may
be used
as a guide
for
removal
and
given
in Section
2.
installation
of system
components.
19-49.
REMOVAL.
(See
figure
19-23.)
19-56.
RIGGING.
(See
figure
19-24.)
a.
Depressurize
reservoir
by depressing
air
filler
a.
Disconnect
flexible
control
(4) at aft
end of
valve
core
(52),
and
remove
core
after
pressure
is
valve
(13).
released.
b. Rotate
stop (18)
to full
FORWARD
position.
b.
Remove
reservoir
filler
cap
(41)
and
screen
(42).
c.
Turn
on master
switch.
Thread
a piece
of
safety
wire
through
air filler
valve
d.
Using
switch
(9)
on control
stock,
actuate
arm
stem,
reservoir,
and oil
filler
port.
on
valve
(13) to
full FORWARD
position
(FULL-
c. Cut
air
filler valve
stem
(52),
and
remove
in-
OPEN),
then
turn master
switch
off.
ternal
portion
with
safety wire.
e.
Rotate
nut on forward
end of
shaft (16)
until
stop (18)
rests against
valve
arm.
19-50.
INSTALLATION.
f.
In cockpit,
turn
knurled
knob
on shaft
to move
a.
Wet
new air
filler
valve
stem
around
groove
with
stop
(5) to
full AFT
position
to line
up with
'20"
on
clean hydraulic
fluid (DEXRON
Automatic
Transmis-
placard
(FULLY-OPEN)
mounted
adjacent
to control.
sion Fluid),
and
wrap safety
wire around
threaded
end.
g. Connect
flexible
control
at aft end
of valve (13).
b. Insert
safety
wire
wrapped
valve
stem
through
filler
port,
and align
with air
valve
mount
port.
Pull
19-57.
ELECTRICALLY-DRIVEN
AGITATOR
IN-
valve
stem
through
port
with
long nosed
pliers
or
with
STALLATION.
(See figure
19-25.)
tire valve
installing
tool.
Beginning
with serial
18800833,
an electric-driven
agitator
is available.
The previous optional
agitators
NOTE
for the gate box, which
are still available, were
air-
driven fans
causing some
drag loss and
operational
Use
care when
installing
air valve
stem.
Re-
vibration.
The
electric-driven
agitator
is a
part of
move safety
wire
while
holding
stem,
and pull
the
gate box
assembly
and
is available
in 12 or
24
stem
through
orifice
carefully,
because metal
volts.
Activation
of the agitator
motor
is controlled
edge of reservoir
top may
cut through valve
by a microswitch
attached to
the metering gate
con-
stem creating
a hazard condition.
trol.
When the hopper
is opened
for dry dispersal,
the agitator automatically functions.
e. Reinstall
filler
screen (42) and
cap (41), pres-
surize
reservoir
to approximately
15 psi with
clean
19-58.
RIGGING.
(See figure
19-25.)
air source,
and install
air valve
cap.
a.
Move gate
box control
handle
to full aft
position
(gate
box
closed).
19-51.
SPRAY PUMP
STRAINER.
(See
figure
b. Adjust
switch
roller to
contact bellcrank
as
19-22.)
lever is moved
forward
to open gate
box.
c. Electric
motor should
start as
gate box opens.
19-52.
DESCRIPTION.
A strainer
may
be
mounted
between
the gate
box
outlet
and the
spray
pump
of
liquid
dispersal
systems
to strain
out
undissolved
liquid
dispersal materials
and to
catch foreign
ob-
jects
before
they
reach the
spray
pump.
Removal
of the
strainer
screen
for
cleaning
or daily
inspec-
tion
is accomplished
by cutting
the safety
wire
and
turning
the
handle
at the
bottom
of the
strainer
in a
counterclockwise
direction.
If necessary,
a screw-
driver
or suitable
tool positioned
through
the
handle
will give
added
leverage
for
loosening
the
strainer
cap and screen.
19-52