THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
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: 01/01/08
6-5
