Cessna T188C - Description (Beginning with 18801683); Removal (All Models Beginning with 18801683); With 18801683)

MODEL
188
&
T188
SERIES
SERVICE
MANUAL
19-66. REMOVAL.
(AgWagon)
(thru 18801682)
stop
is located
at the bottom
aft side
of support
(9) as
shown in
figure 19-21,
sheets 10 and
11. This stop is
a.
Remove side
panels
on left side
of aircraft,
aft
used
to limit the
travel of
handle (18)
when rotated
of firewall.
to increase
boom pressure.
b. Depress
air valve
core in body
assembly of
hy-
draulic
reservoir
to relieve
system
pressure.
19-70.
REMOVAL.
(All
Models
Beginning
with
c. Disconnect
and
cap or
plug
hoses
at
elbows
on
18801683.)
valve.
a.
Remove side
panels
on left side
of aircraft,
aft
d. Back
out
stop bolt
to clear
shaft
assembly.
of firewall.
e. Loosen
lock
nuts and
run
nut up
to cap;
slide
b.
Depress
air
valve
core in
body
assembly
of
valve inboard
through
bracket
to remove
hydraulic
reservoir
to relieve
system pressure.
c. Disconnect
and cap
or plug
lines
at elbows
on
19-67.
REMOVAL. (AgTruck)
(thru 18801682)
valve.
a. Remove
side
panels on
left side of
aircraft,
aft
d. Referring
to sheets
10 and
11 of figure
19-7,
of firewall.
disconnect
valve
control linkage
(7) at
spools (16).
b. Depress
air valve
core
in body assembly
of
hy-
e. Loosen
setscrews
(11) at
adapter (12);
remove
draulic reservoir to relieve system pressure. linkage from valve (6).
c. Disconnect
and cap
or plug
hoses
at elbows
on
valve.
NOTE
d. Back
out stop bolt
to clear shaft
assembly.
e. Loosen set screws
in shaft assembly.
Setscrews (11) and
packing nut (23) are in-
f. Slide valve
downward through slot in bracket
to stalled after
being primed with Grade
T
remove.
Primer and
sealed with Grade CV Loctite.
19-68.
INSTALLATION.
(thru 18801682)
f. Remove
packing
nut (23),
nuts (19)
and washers
(22) attaching
valve
(6) to bracket
(21);
remove
valve
NOTE
(6).
g. To
remove
remainder
of linkage
(7),
loosen
Install valve so direction of
arrow and
setscrew (11) from handle (18)
and pull linkage for-
direction of flow are the same. ward from support (9).
a. With valve in closed
position and with light valve
19-71. INSTALLATION.
(All Models, Beginning
seat contact, assemble shaft assembly with stop tab with 18801683. )
in most outboard
position (same
side as arrow
on
a. Install
valve (6) with arrow
pointing down,
on
valve.)
bracket
(21) with nuts
(19), washers
(22)
and packing
b. Install
valve without plumbing in mounting
brack- nut (23)
as shown on sheet 11 of figure
19-21.
et assembly with stop tab on lower aft side of stop
bolt (maximum
rotation approximately
30
°
out of BL-
NOTE
plane or when valve contacts outboard side of bracket.)
Assure
that end of
stop bolt
is l-inch
from inboard
After
installing
valve (6),
and nuts
(19) and
edge of bracket.
washers (22), prime
threads of valve with
c. Connect cable
assembly with spline assembled
Grade T
primer and seal with Grade
CV
such
that control knob
in cockpit is
in a position
Loctite before
installing packing
nut (23).
nearest number 9 on placard. Turn packing nut finger tight at this time.
d. Connect
hoses and
check alignment
of valve.
e. Tighten set screws
on AgTruck model.
b. Install lines (1) and
(2) at elbows on valve (6).
f. Tighten stop
bolts.
c. Install forward
hall of linkage assembly (7)
by
threading
adapter
(12)
onto
valve
assembly
(6)
and
19-69.
DESCRIPTION.
(Beginning
with 18801683.)
tightening
setscrews
(11) (alter priming
with Grade
A boom pressure valve in the hydraulic system is T primer and sealing with Loctite Grade CV) into
used to regulate
system boom pressure
to a pre-
valve stem flats.
scribed setting. When the hydraulic system is oper- d. Install aft hall of linkage assembly (7) in support
ating and the boom
pressure valve
is closed, all
assembly (9).
pressure being developed in the system is directed e. With short end of handle (18) pointing to the
to the hydraulic motor and the motor drives the spray number "9" position on support (9), lightly seat valve
pump at maximum output.
This condition would re-
assembly (6) closed (clockwise);
install setscrew (11)
suit
by rotating the boom
pressure control knob,
into handle
(18).
located
below
the left
side
of the instrument
panel,
f.
Install
adjustment
screws
and
nuts into
two
to an index setting of 9. If less boom pressure is spools (16).
required, the
boom pressure
control knob
can be
rotated
back
to any
index from
9 to
0. The
index
NOTE
numbers
do
not indicate
a
specific
pressure
but
are
for index purposes only,
and are useful in establish-
If necessary, rotate
valve seating counter-
ing similar pressures
on successive
spray
runs. A
clockwise
for proper
hole alignment
of
spools.
19-57