Cessna 188 Series Service Manual page 473

MODEL 188 & T188 SERIES SERVICE MANUAL
19-59 AUTOMATIC FLAGMAN. (See figure b. Keep water from entering and running down into
19-59. AUTOMATIC FLAGMAN. (See figure) the solenoid. if the solenoid should fail because of
excessive foreign material or water, it can be taken
19-60. DESCRIPTION.
The Automatic Flagman
apart, cleaned and reassembled.
The plunger should
have a shiny outside surface. If this should become
dispenser is located on top of the right stub wing, just have
a outside become
outside of the catwalk.
The unit ejects a disposable rusted, it should be taken apart and polished with
paper streamer attached to a piece of cardboard
very fine sandpaper. The use of liquid fertilizers,
which serves as a weight. The flag lands in the which may come in contact with the solenoid, will
center of the swath being sprayed upon actuation adversely affect its operation. Protect the solenoid
of an electric solenoid by the pressing of a trig-
by spraying the inside with silicone spray if using
ger on the control stick. Air pressure is fed in liquid fertilizers.
Generally, the solenoid should be
from the slipstream through a hole in the front of
cleaned each 50 hours or more often if under dirty
the nose cone and is transmitted onto the flags in field conditions.
dispenser and feeds them to the rear, holding them c.
The contact points of the electrical switch should
firmly against the rear stops.
be cleaned each 100 hours.
CAUTION.
DO NOT USE THE AUTOMATIC FLAGMAN WHEN
Be sure that switching of the solenoid is so
USING SULPHUR DUSTS AS THE SOLENOID
as not to have continuous current to the
COULD CAUSE A FIRE IN THE DUST.
solenoid or it will burn out. A momentary
button on top of the control stick will burn
19-61. REMOVAL.
(See figure 19-8.)
up solenoids when erroneously activated
a. Remove screws and washers attaching nose cone by pilots lacing hard hats on top of the
(9) to bracket (11).
stick while away from the aircraft.
b. Remove (13) screws attaching nose cone (9) to
dispenser (3); remove nose cone.
c. Disconnect electrical leads (14) at socket and
housing (19) and remove bolts and nuts attaching
This information supplements vendor instructions
solenoid (1); remove solenoid. stowed in
the arcraft
d. Remove bolts and washers attaching dispenser
19-84. BOOM PRESSURE VALVE AND CONTROL
to bracket (12).
KNOB. (See figure 19-21, sheets 9 and 10.)
e. Remove bolts attaching supports (5) to support
(18): remove dispenser (3).19-65.
DESCRIPTION. (18801375 thru 18801682), a
f. Remove two access covers under stub wing and boom pressure valve n the hydraulic system is used
disconnect electrical leads at terminals.
disconnect electrical leads at terminals.
to regulate dispersal system boom pressure to a pre-
g. Pull tubing (16) and leads (14) out through grom-
scribed setting. When the hydraulic system is op-
met (15). erating and the boom pressure valve is closed, all
19-62. INSTALLATION. (See figure 19-8.)
pressure being developed in the system is directed to
the hydraulic motor and the motor drives the spray
a Place dispenser (3) on right stub wing and in- the hydraulic motor and th motor drives the spray
pump at maximum output. This condition would re-
stall bolts and washers attaching dispenser to bracket pump by rotating
the boom pressure control knob lo-
(12).
. cated below the left side of the instrument panel, to
b. install bolts attaching supports (5) to support (18). an index setting of 9. If less boom pressure is re-
c. Position nose cone (9) and install screws and
an index setting of 9. If less boom pressure is ro-
quired, the boom pressure control knob can be ro-
washers attaching nose cone to bracket (11); install tated back to any index from 9 to 0. The index num-
(13) screws attaching nose cone to dispenser.
bers do not indicate a specific pressure but are for
d. install solenoid (1) on dispenser.
index purposes only, and are useful in establishing
e. Remove two access covers under stub wing,
similar pressures on successive spray runs.
A stop
route tubing (16) and leads (14) through grommet (15); bolt normally limits the amount the boom pressure
connect leads at terminals inside stub wing.
valve is open, as indicated by an index setting of 0.
f. Connect electrical leads at socket and housing(l
9
). Under some conditions where the operator is using
22 nozzles with small orifices, he may want to back
19-63. INSPECTION AND MAINTENANCE.
out the stop bolt to allow more opening of the boom
a. The inside surface of the dispenser is waxed and
pressure valve for a greater reduction of boom pres
contains a smooth, dirt-free finish.
Care should be sure. The stop bolt is attached to the boom pressure
taken to prevent entry of foreign material or water.
valve bracket and is accessible by removing the left
The inside of the dispenser should be waxedfuselage
side panel.
occasionally.
19-55