Cessna 188 Series Service Manual page 145

MODEL 188 & T188 SERIES SERVICE MANUAL
9-3. TROUBLE SHOOTING (Cont).
TROUBLE
PROBABLE CAUSE REMEDY
TRIM INDICATOR FAILS Pointer incorrectly positioned Re-rig system in accordance
TO INDICATE CORRECT during rigging. with paragraph 9-12.
TRIM POSITION.
INCORRECT TAB TRAVEL. Stop-blocks loose or incorrectly Rig system in accordance
adjusted on control cables, with paragraph 9- 12.
9-4. TRIM TAB. b. Disassemble actuator assembly (1) as illustrated
in Detail A as follows:
9-5. REMOVAL AND INSTALLATION. (See 1. Remove chain guard (3) if not previously re-
figure 9-1.) moved in step "d" of paragraph 9-7.
a. Disconnect push-pull tube (22) at horn assem- 2. Using suitable punch and hammer, remove
bly (21). groove pins (8)securing sprocket (5) to screw (9) and
remove sprocket from screw.
NOTE
3. Unscrew threaded rod end (15) and remove
rod end from actuator.
If trim system is not moved and actuator 4. Remove groove pins(10)securing bearings
screw is not turned, rigging of system (6 and 14) at the housing ends.
should not be necessary after installation 5. Lightly tap screw (9) in the opposite direc-
of tab. tion from sprocket end, remove bearing (14), O-ring
(13) and collar (7).
b. Drill out rivets securing trim tab hinge to ele- 6. Lightly tap screw (9) toward the sprocket
vator and remove trim tab. end of housing, remove bearing (6) and collar (7).
7. It is not necessary to remove retaining rings
NOTE (11).
After tab has been removed and if hinge 9-9. CLEANING, INSPECTION AND REPAIR.
pin is to be removed, it is necessary to (See figure 9-4.)
spread the crimped ends of the hinge a. DO NOT remove bearing (16) from threaded
before driving out pin. When a pin has rod end (15) unless replacement of bearing is neces-
been installed, crimp ends of hinge to sary.
prevent pin from working out. b. Clean all component parts, except bearing (16),
by washing in Stoddard solvent or equivalent. Do not
c. Reverse preceding steps for reinstallation. Rig clean sealed bearing (16).
system, if necessary, in accordance with paragraph c. Inspect all component parts for obvious indica-
9-16. tions of damage such as stripped threads, cracks,
deep nicks and dents.
9-6. TRIM TAB ACTUATOR. d. Check bearings (6 and 14), screw (9) and thread-
ed rod end (15) for excessive wear and scoring.
9-7. REMOVAL AND INSTALLATION. (See Dimensions of the parts are as follows:
figure 9-1.) BEARING (6)
a. Remove access plate from left side of tailcone INSIDE DIAMETER 0. 373" MIN.
and from lower side of right stabilizer. INSIDE DIAMETER 0. 374" MAX.
b. Remove safety wire and relieve cable tension at
turnbuckle (17), BEARING (14)
c. Disconnect push-pull tube (22) at actuator rod INSIDE DIAMETER
end (23). SMALL HOLE 0.248" MIN.
d. Remove chain guard (25) and disengage chain SMALL HOLE
0. 249" MAX.
(27) from sprocket (26). LARGE HOLE 0.373" MIN.
e. Remove screws securing clamps (28) and care- LARGE HOLE 0. 374" MAX.
fully remove actuator (24) through access opening.
f. Reverse the preceding steps for reinstallation. THREADED ROD END (15)
Rig system in accordance with paragraph 9-12, OUTSIDE DIAMETER
safety turnbuckle and reinstall all items removed (SHANK) 0. 245" MIN.
for access. 0. 246" MAX.
SCREW (9)
9-8. DISASSEMBLY. (See figure 9-4.)
OUTSIDE DIAMETER 0. 369" MIN.
a. Remove actuator in accordance with paragraph 0.370" MAX.
9-7.
9-2