Rockwell Commander 112 - Main Wheel Reassembly and Installation; Nose Wheel Reassembly and Installation

ROCKWELL
COMMANDER
112/B/TC/TCA
MAINTENANCE MANUAL
SECTION VI
LANDING GEAR,
WHEELS
AND BRAKES
INSPECTION OF MAIN WHEEL ASSEMBLY
a. Visually check all parts for cracks, distortion,
defects and excessive wear.
b. Check internal diameter of felt grease seals.
Replace felt grease seal if surface is hard or
gritty.
c. Check tires for cuts, internal damage and de-
te rio rat ion.
do Check bearing cones and cups for wear and
pitting;
relubricate.
e. Replace any wheel casting having visible cracks.
MAIN WHEEL REASSEMBLY AND INSTALLATION
The main landing gear wheel assemblies and the tires
and tubes are individually balanced at the time of
manufacture. The tire balance mark is a red dot
. placed on the casing sidewall. The tube balance mark
is yellow. Align the red dot with the yellow mark
when mounting tires on wheels.
a. Assuming bearing cup is installed in each
wheel, install tire with tube on outer half and then
join two wheel halves.
b. Install wheel through-bolts and brake disc.
Torque nuts to 90 inch-pounds. Inflate tire to seat
beads, then adjust to correct pressure (see Figure
6-9) .
c. Lubricate bearing cones with MIL-G-S1322
grease. Install bearing cones, grease seals, and
seal retainer rings, and secure with snap rings.
d. Slide wheel on axle and install axle nut. Lubri-
cate axle nut with MIL-G-81322 grease.
e. While rotating wheel, torque nut to 50 inch-
pounds. While rotating wheel back off nut to 0 inch-
pounds. While rotating wheel retorque nut to 20-25
inch-pounds. If not in locking position, advance nut
to next
poSition (not to exceed 30
0
rotation) while
rotating wheel and install cotter pin and dust cover.
f. POSition brake lining back plate between wheel
and brake disc and install two cap bolts joining cylin-
der housing and back plate assemblies.
A tire will lose one pound of pressure for each five
degrees drop in temperature; therefore, tire pres-
sure should be checked frequently and especially
after wide variations in local temperature. Do not
inflate tires in a warm hangar and then move the air-
craft outside in the cold, as a significant loss in tire
pressure will occur. Operating an aircraft with
underinflated tires will cause rapid tire wear and may
result in hidden tire damage and internal failure (see
Figure 6-9 for proper tire and strut pressures).
NOSE WHEEL REMOVAL AND DISASSEMBLY
To remove and disassemble a nose landing gear wheel
refer to Figure 6-3 and proceed as follows:
a. Jack aircraft as outlined in Section II.
b. Remove self locking nut, washer and axle bolt.
c . Remove axle cups and axle and drop wheel out
from fork. Axle spacers are now free for removal.
d. Wheel halves may be separated by first com-
pletely deflating tire. With tire completely deflated,
remove wheel through-bolts.
e. Pull wheel halves from tire by removing
wheel half opposite valve stem first and then other
half (see Figure 6-S).
f. Wheel bearing assemblies may be removed
from each wheel half by first removing snap rings
that secure grease seal retainers.
g. Remove retainers, grease seals and bearing
cones. Bearing cup may be removed by tapping out
evenly
from inside. Bearing cup should not be re-
moved except when replacement is necessary.
INSPECTION OF NOSE WHEEL ASSEMBLY
a. Visually check all parts for cracks, distortion,
defects and excess wear.
b. Check internal diameter of felt grease seals •
Replace the felt grease seal if surface is hard or
gritty.
c. Check tire for cuts, internal damage and de-
terioration.
d. Check bearing cones and cups for wear and
pitting;
relubricate.
e. Replace any wheel casting having visible cracks.
NOSE WHEEL REASSEMBLY AND INSTALLATION
Tires, tubes and wheels are individually balanced at
the time of manufacture. The tire balance mark is a
red dot on the outside of casing sidewall. The tube
balance mark is usually white. Always assemble
tire and tube with marks aligned.
a. Install bearing cup in each wheel half, in-
stall tire with tube on wheel half containing valve
stem hole and then join two wheel halves. Install
wheel through-bolts with washers and nuts to valve
stem side. Torque nuts to 90 inch-pounds and inflate
tire. See Figure 6-9.
b. Lubricate bearing cones and install cones,
grease seals, felt rings and seal retainer rings.
Secure with snap rings.
c. Position wheel between fork, insert axle and
axle spacers and install axle cups.
d. Install axle bolt, washer and nut, tighten axle
nut to 50 inch-pounds and back off nut one-half turno
Check axle cups for movement. Ifaxle cups move,
install one AN960D416 washer under bolt head. Check
wheel
for free rotation. There should be a O. 000 to
O. 004-inch total clearance between fork and each
axle spacer.
A tire will lose one pound of pressure for each five
degrees drop in temperature; therefore, tire pres-
sure should be checked frequently and especially after
wide variations in local temperature. Do not inflate
tires in a warm hangar and then move the aircraft
outside in the cold, as a significant loss in tire pres-
sure will occur. Operating an aircraft with under-
inflated tires will cause rapid tire wear and may re-
sult in hidden tire damage and inte rnal failure (see
Figure 6-9 for proper tire and strut pressures).
6-17
Copyright Commander Owners Group 2013 All Rights Reserved
**unofficial copy**