Cessna T188C - Rigging; Cleaning Dispersal Equipment. 2 J6;19-26

MODEL
188 & T188
SERIES SERVICE
MANUAL
NOTE
CAUTION
Insure that
hopper is clean and drained
prior Exercise
caution, as mount latches
are
to working under aircraft on the dispersal open, because spreader will drop down
system. Even small amounts of agricultural and possibly forward, if not supported.
chemicals can be dangerous.
b. Referring to figure 19-14, set up 2-inch dimen-
a. In cockpit
place gatebox door control
in FULL sion at gate
hinge forks (6) and the 11. 6-inch
dimen-
FORWARD
position. Micrometer
screw stop must
sion on gate box assemblies
(4).
be lifted to
allow control to move to the
dump c. In cockpit,
move gate box control handle
(item
position.
9, figure 19-15)
to the FULL AFT position
b. Disconnect two gate box rod assemblies (4)
from gate
assembly (5), allowing
door (9) to
NOTE
swing free. (See figure 19-15.)
c. Remove four door mount
bolts (8) allowing
Ensure that clearance is
maintained between
removal
of door (9) from gate
box, exposing
control arm and aircraft
belly skin.
agitator.
d.
If seal is to be
replaced, remove
nine bolts (10)
d.
Referring to figure
19-15, align
control rod (3)
securing
seal retainer
(11) and
seal (2) to door
(9).
with arm on
bellcrank assembly
(7).
e. Install
hardware in removal
sequence,
ensuring
NOTE that sufficient belly clearance is maintained and that
bellcrank is locked overcenter.
Seal
is of cast urethane
compound material,
f. Referring
to figure
19-14, tighten
nine gate seal
and
is sell lubricating.
It is secured
by the
mount
bolts (10)
and four door
mount bolts. (8).
retainer
only. Bronze
bushings on
agitator
g. Operate
handle
in cockpit to ensure
smooth
shaft
require occasional
oiling,
operation
throughout
limits of movement
Overcen-
ter should be felt as the handle reaches FULL AFT
e.
If repair or removal
of agitator is
required,
traveL
proceed to step "h".
h. Check seating of gate box
seal by pouring water
f.
Place door in opening of gate box,
and install into the
hopper with the gate closed.
There should
four mount bolts
(8). Loosen two gate hinge
fork be no
seepage around seaL
nuts
(6) as new seal will
be thicker than
old one.
If reinstalling
same seal, above
step may be
NOTE
omitted.
g. Connect
gate box rod assemblies
(4) to door If
leakage is evident, adjust hinge
fork
brackets (5). Since rod ends are not normally bolts or gate box rod as required to seal.
adjusted from
the 11.6 inch
length, re-adjustment
is not necessary, however,
for ease of operation
i. Raise front of spreader,
latch two front mount
rods may be lengthened, when dry chemicals are latches, and install eight mount screws. Tighten
used.
two rear mount bolts (item
13, figure 19-15) at rear
h. Remove four
speed reducer mount
bolts on
of spreader.
agitator drive, and if electrically driven, remove
applicable wiring. Mark wires to aid installation.
Remove
speed
reducer,
separating
drive coupling
19-32.
CLEANING
DISPERSAL
EQUIPMENT.
halves.
This will
allow agitator
removal
from
It is
important
that dispersal
equipment
be
bearing
at non-drive
end
of gate box.
To reassemble
kept clean.
Since
there are
literally
thousands
of
reverse
above steps. Lube agitator
bearing surfaces trade
formulations for chemicals that
may be used
with Electro
Molly,
No.
11.
in
aerial
application,
it is
impractical
to
list clean-
ing compounds for all types. Follow manufacturer
19-31.
RIGGING.
instructions
when
given.
However,
a solution
of household ammonia and water, or a solution of
NOTE
powdered,
activated
charcoal,
laundry
detergent,
and water will generally suffice. Mix the ammonia
To set
up gatebox,
see figure
19-14,
solution
in a ratio
of one quart
of household
am-
and loosen
nine
seal mount
bolts (10)
and
monia to
one gallon
of water.
Prepare
about five
four
door mount
bolts (8).
This will
allow
gallons and
pour into
the hopper,
agitate
vigorously
is closed
With
spray nozzles
removed,
start
the engine
and
operate at 1500 rpm, release the fan brake and
empty the hopper through the system. This will
a. Gate box assembly must be set up prior to rig- empty the hopper through the system. This will
ging
the controls.
To accomplish
this, drop
sprea-
water.
Mix
the charcoal
solution
in
a ratio
of 1/4
der down
for
access.
See
figure
19-15,
remove
pound
of
activated
charcoal
and
1/8 to
1/4 pound
of
eight
screws
along
rear edge
of
gate.
Loosen
two
laundry
detergent
to 10
gallons
of
water.
The
same
rear spreader mount bolts (13),
and open spreader cleaning
and flushing procedure may
be used with
latches 12). this solution. When operating the system, be sure
19-26