THRUSH AIRCRAFT, INC – MODEL S2R-G10
AIRCRAFT MAINTENANCE MANUAL
6-5
INSPECTION OF MAIN WHEEL
ASSEMBLY
Ref. figure 6-2
Clean all parts in cleaning solvent and dry
thoroughly. A soft bristle brush may be
used to remove hardened grease, dust or
dirt.
CLEANING SOLUTIONS ARE
TOXIC AND VOLATILE. USE
IN A WELL VENTILATED
AREA. AVOID CONTACT WITH
SKIN AND CLOTHING. DO
NOT INHALE VAPORS.
I. Inspect bearing cones for nicks,
scratches, water staining, spalling,
heat discoloration, roller wear, cage
damage, cracks or discoloration.
J. Inspect wheel-bearing grease for
contamination and solidification (see
Inspection Intervals Chart in Section
2). When repacking wheel bearings,
use MIL-G-81322 (Aeroshell 22).
K. Inspect wheel halves for cracks,
corrosion and other damage. A
cracked or badly corroded casting
should be replaced. Small nicks
scratches or pits can be blended out
using fine 400-grit sandpaper.
* NOTE *
Wheel halves can be replaced
individually. Wheel sets no
longer have to be replaced as
matched pairs.
L. Inspect snap rings and grease seals
for distortion or wear. Replace parts, if
damage or deformed. Saturate grease
seal felts with SAE 10 oil (do not
soak).
M. Inspect bearing cups for looseness,
scratches, pitting, corrosion, or
evidence of overheating. The bearing
cups are pressed into the wheel
halves and should not be removed
unless replacement is necessary due
to the above conditions. If
replacement is necessary, proceed as
follows:
1. Insert wheel half into boiling water
for one (1) hour or place it in an
oven at 250 degrees Fahrenheit for
30 minutes.
WARNING!
2.
Remove wheel half from source of
heat and invert wheel half. If
bearing cup does not drop out, tap
the bearing cup evenly from the
axle bore with a fiber drift pin or
suitable arbors press.
3. When replacing a bearing cup,
repeat step 1, and chill bearing cup
in dry ice for a minimum of 15
minutes.
4. Remove wheels half from source of
heat and bearing cup from the dry
ice.
5. Dry the chilled bearing cup and coat
its contacting surfaces with zinc
chromate primer.
6. Install the chilled bearing cup into
the bearing bore of the heated
wheel half. Tap bearing cup gently
and evenly into place, using a fiber
drift pin or suitable arbor press.
N. Inspect wheel brake disc assembly for
cracks, excessive wear or scoring,
coning, and rust or corrosion (see Fig.
6-3). Remove corrosion and blend out
small nicks using fine (400 grit)
sandpaper. Replace brake disc if
worn below wear limit of .395 inch.
Coning of disc in excess of 0.015 inch
is cause for replacement of disc.
O. Inspect self-locking nuts for self-
locking feature. Replace nuts if they
can be turned onto the bolt past the
self-locking section by finger.
Effective: 03/26/2010 Page
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