Cessna 188 Series Service Manual page 112

MODEL 188 & T188 SERIES SERVICE MANUAL
5-24.
DISASSEMBLY AND REASSEMBLY OF TAIL
force. A minimum of four springs are used.
WHEEL ASSEMBLY. (See figure 5-7.) o. On the 10-inch tailwheel assemblies from serial
Figure 5-7 may be used as a guide during disassembly 18800573 thru 18800618, torque nut to 7 lb. ±1 lb.
replacement of parts and reassembly of the tail wheel, break-away force.
p. On the 10-inch tailwheel assemblies, from serial
NOTE 18800619 thru 18802745, locate springs left and right,
opposite each other and torque nut to 8 lb. ±2 lb.
The bearing cups are a press fit in the wheel
break-away force.
halves and should not be removed unless re-
q. On the 10-lnch tailwheel assemblies, beginning
placement is necessary. To remove bearing
with serial 18802746, when assembly operations on
cups, heat wheel halves in boiling water for 15
tailwheel assembly is completed, torque nut before
minutes.
Using an arbor press, if available,
lubrication to attain approximately 12 to 15 lb. pull
press out bearing cup and press in new one at tailwheel steering cable attach point on steering
while wheel is still hot. arm assembly.
It may be necessary to use washers
(P/N S1450-9S14-012), available from the Cessna
a. After removal, deflate tire by removing valve
Supply Division, as required, to attain 12 to 15 lb.
core. pull. Refer to paragraph 5-26 for adjustment of the
b. Grease seals, retainers, and bearing cones need anti-shimmy mechanism.
not be removed to replace a tire, although their re-
moval for cleaning, inspection, and lubrication is NOTE
recommended.
c. Remove bolts fastening wheel halves together,
The six friction adjustment springs must not
then separate wheel halves, removing tire, tube, and engage the friction plate assembly.
gasket between wheel halves.
a. Clean all metal parts and grease seal felts in
r. Inflate tire to seat beads, then adjust to correct
solvent and dry thoroughly.
pressure, specified in figure 1-1 of this manual.
e. Inspect wheel halves for cracks.
Cracked wheel
halves must be replaced.
Sand out nicks, gouges, 5-25. INSTALLATION OF TAIL WHEEL.
and corroded areas. Where protective coating has a. Make sure spacers, washers, and lockwashers
been removed, area should be cleaned, primed, and
are in place as tailwheel is positioned in fork, then
painted. install axle bolt.
f. Replace felt seals if after normal cleaning
b. Tighten axle nut until a slight bearing drag is
they are embedded with foreign matter, the felt is obvious as wheel is turned. Back off nut to the near-
not pliable, or the material is broken or does not re- est castellatlon and install cotter pin.
tain shape necessary for proper sealing. Oil felts c. Lubricate tailwheel at grease fitting.
lightly at installation. d. Remove padded stand placed under tailcone.
g. Bearing cups and cones should be repacked if
damaged or discolored. After cleaning, repack 5-26. ADJUSTMENT OF ANTI-SHIMMY MECHANISM.
bearing cones before installation. (See figure 5-7.)
h. Place tube in tire.
Position wheel halves in
tire, with gasket in place, so that valve stem and
NOTE
bolt holes are properly aligned.
i.
Hold wheel halves together, making sure that Prior to adjusting anti-shimmy mechanism,
tube is not pinched, and install and tighten the bolts check torque on spindle nut for a reading of
evenly. 12 to 15 lbs. when measured at the tailwheel
NOTE steering cable attach point. Failure to do so
could result in bearing failures and improper
During reassembly, torque bolt on tailwheel
friction setting of anti-shimmy mechanism.
assembly until gear has the following break-
away force, and measured at the cable attach Adjustment of the anti-shimmy mechanism on the 10"
hole.
tailwheel assembly is to be accomplished by turning
the six setscrews clockwise, maintaining approxi-
j. On the 8-inch tailwheel assemblies thru serial
mately equal number of turns for each screw until
18800572, torque bolt to 10 lb. ±1 lb. breakaway force.
a friction level of 16 lb. ±1 lb. is reached when
k. On the 8-inch tailwheel assemblies from serial
measured by the use of a stick-force gauge or fish
18800573 thru 18800618, torque bolt to 7 lb. ±1 lb. scale at the tallwheel steering cable attach point on
1. On the 8-inch tailwheel assemblies from serial
the tailwheel steering arm.
18800619 thru 18802745, torque bolt to 8 lb. ±2 lb.
m. On the 8-inch tailwheel assemblies from serial 5-27. TAIL WHEEL BALANCING.
Refer to para-
18800670 thru 18801034, install (2) #3233 Scott springs
graph 5-17 of this manual.
diametrically opposed to each other to obtain 8 lb ±2
lb break-away force. 5-28. TAIL WHEEL LOCK SYSTEM. (See figure
n. On the 10-inch tailwheel assemblies thru serials
5-7, sheet 3 of 3 and figure 5-8.)
18800572, torque bolt to 15 lb. ±1 lb. break-away
force. Beginning with serial 18800517, friction 5-29.
DESCRIPTION. The steerable tail wheel in-
springs are installed to obtain desired break-away corporates a manual anti-swivel locking system which
5-30 Revision 1