THRUSH AIRCRAFT, INC – MODEL S2R-G10
AIRCRAFT MAINTENANCE MANUAL
Page
6-16 Effective: 03/26/2010
B. Inspect felt grease seals. Replace if
surface is hard or contaminated, or
shows evidence of excessive wear.
Lightly saturate grease seal felts with
SAE 10wt. Oil (3-in-ONE oil) (do not
soak).
C. Inspect tire for cuts, anomalies,
internal damage and deterioration.
D. Inspect inner tube for cuts, wrinkles,
anomalies and deterioration. Do not
use a used inner tube with a new tire.
Tubes grow in service, taking a
permanent set of about 25% larger
than original size. This makes a used
tube too large to use in a new tire,
which could cause a wrinkle and lead
to tube failure.
E. Inspect wheel bearing grease for
contamination and solidification at
each periodic inspection. Repack
bearings with MIL-G-81322 (Aeroshell
22) or equivalent grease. Note: Do not
exceed 500 wheel miles or on annual
inspection whichever comes first
between repacking intervals.
F. Clean and inspect bearing cups and
cones. Note: Do not spin dry bearings
or handle bearing components with
bare hands. The bearing cup should
not be removed except when
replacement is necessary due to
scratches, nicks, pitting, spalling,
corrosion, brinelling, or evidence of
overheating. Note: If bearing cup is
replaced, its companion bearing cone
must also be replaced.
G. Bearing cup removal: Heat wheel half
in an oven not exceeding 212°F for 15
minutes. Remove wheel half from heat
source and immediately remove
bearing cup by carefully tapping out
evenly from the inside with a fiber drift.
H. Bearing cup installation: Place wheel
half in oven not exceeding 212°F for
15 minutes. Chill new bearing cup in
an atmosphere of -25°F to -65°F for no
less than 4 hours. Chilling can also be
accomplished by placing the bearing
cup in dry ice for a minimum of 15
minutes. Dry cup thoroughly and
install chilled bearing cup into bore of
heated wheel half using a thin coat of
zinc chromate primer for protection
and lubrication. Tap gently into place
with fiber drift making sure bearing cup
is evenly seated against shoulder of
wheel half. Avoid cocking bearing cup
during installation. If bearing cup will
not seat properly in wheel half, repeat
above said procedures or replace
wheel half assembly.
I. Replace any wheel casting that is
distorted, corroded, or has visible
cracks.
TAIL LANDING GEAR WHEEL & TIRE
REASSEMBLY AND INSTALLATION
Ref. figure 6-8
To assemble and reinstall tail wheel,
proceed as follows:
A. Wipe tire and tube (serviceable or
new) with denatured alcohol, followed
by soap and water, then dry
thoroughly.
B. Inflate the inner tube just enough to
round it out; dust tube lightly with tube
talc.
C. Place tube in tire and align balance
marks. If tube has no balance mark,
place valve stem adjacent to tire
balance red dot.
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