Cessna T188C - Electric Butterfly Valve Disassembly; Electric Butterfly Valve Reassembly; Electric Butterfly Valve Disk Clutch Rigging

MODEL 188 & T188 SERIES SERVICE MANUAL
ment screw will increase the suction. The screw NOTE
should be "backed-out" until the nozzle ceases
"dripping".
Back adjustment
screw
out seven turns
To replace seals
and/or inserts,
refer to
from CLOSED position
for maximum "suck-back.
" paragraph
19-82 of 19-83
To adjust limit switching, use slotted 1/4-inch bolt
shown in Detail
"B" in figure 19-28. Use fabricated
19-92. ELECTRIC
BUTTERFLY VALVE DISK
bolt tool on worm shaft assembly
tang so tha. 35-
CLUTCH RIGGING.
(See figure 19-30.)
inch
to .45-inch
overtravel
dimension, when
switch
a Aircraft
switch in
OFF position.
activates,
does
not allow cam
to contact
the positive
b. Install
an ammeter
in series
with the
spray valve
stops
in either direction
when
valve is
in operation.
motor assembly.
c. Monitor
the current
necessary
to run
the valve
19-90.
ELECTRIC BUTTERFLY
VALVE
DISASSEM-
from CLOSED
to OPEN
position. The
motor should
BLY. (See figure
19-30.)
draw 8 amps, once
stop arm (13) reaches stop assem-
a. Remove
bolts and washers
from coupler adapter
bly (17).
(33) and hose adapter (43). d. If the current draw of the motor is not as speci-
b.
Remove coupler adapter (33),
O-rings and pac- fied in
step "c", adjustment of the disk
clutch is ne-
king (34) and (36), and shims (35). cessary.
c. Remove hose adpater (43), O-rings and packings e. Remove safety wire from clutch housing assem-
(42)
and (37),
and
shims
(41).
bly.
f. Holding
clutch
housing
assembly
(4),
adjust
plug
CAUTION
assembly. Turn
plug clockwise (from
motor end,
looking
towards
housing
assembly).
Turn clockwise
Do not intermix
total shim
thickness
from
for a higher
current draw,
or turn clunterclockwise
end-to-end. Insert must be centered to for a lower current draw.
operate
freely.
CAUTION
d. Remove
seal-attaching
screws,
seal
(30)
and
butterfly
halves (27) and (29). If
seal does not meet
A current draw in excess
of 8 amps will
inspection criterion, or is
questinable, discard old
result in damage to
the motor assembly.
seal and install new seal.
e. Check to see that butterfly
halves (27) and (29),
g. Repeat step "c" after each
adjustment of the
shaft (26) and seal
retainer screws
are sealed (Loc-
clutch assembly.
tite Sealant P/N 59231). To ensure proper sealing, h. After proper adjustment has been attained, safety
close butterfly
valve until seat is contacted,
Tighten clutch
assembly as shown in detail
C.
screws
1/4 to
1/2 turn
after
seating
to prevent
de-
forming
seals.
19-91. ELECTRIC
BUTTERFLY
VALVE
REASSEM-
BLY.
(See
figure
19-30.)
a.
Temporarily
install
adapters
(33)
and (43),
less
O-rings
(34) and (42),
bolts (32) and
(44) and washers.
Install
adapters against
packings
(36) and (40).
b. Set valve
upright on one
adapter, and
place a 10-
lb.
weight
on top adapter
to compress
the
packings.
c. Using
a thickness gage,
measure clearance
be-
tween adapters
(33) and (43)
and valve
body (38).
NOTE
Shims
are
available
in
thicknesses
of 0.
005-
inch and
0. 014-inch.
Use combinations
of
shims
to most nearly
meet the
dimensions
measured from each gap.
d.
Remove weight
and adapters
(33) and (43)
and in-
stall
bolts
(32)
and (44)
and
washers.
NOTE
On
1608132-1
Spray
Valves
Shims
(23),
(5) and
(6)
are used as
required to
align worm (22)
and worm
gear (8) and
to line up worm
gear on shaft
(26).
On 1608160-1
Spray Valves
Shims (23) and
(5) are
used
as required
to align worm
(22) and worm
gear
(8).
19-65