Maintenance Manual (Rev B4)
32-41-01 (Rev Dec 16/02)
MAIN GEAR WHEELS AND TIRES - MAINTENANCE PRACTICES
Warning: When performing maintenance on a hydraulic operated landing gear system, be aware that any movement of a hydraulic
actuator cylinder can displace hydraulic fluid and cause unanticipated movement of other actuator cylinders in the landing gear
retraction system. Servicing of the landing gear hydraulic accumulator can also result in unanticipated movement of an
actuator. Either action can result in an unsafe, unlocked landing gear system. Therefore, place the airplane on jacks prior to
performing any inspection or maintenance. Cycle the landing gear and ensure that all three landing gears are down and locked
prior to removing the airplane from jacks.
Maintenance practices for the left and right wheels are the same.
MAIN GEAR TIRES SERVICING
INFLATION
a. The correct main gear tire inflation is 120 ±5 psig at 70° F (21.1° C) ambient temperature with no load.
b. The tires should be over inflated 2.0 psig for each 10° F (5.56° C) below 70° F (21.1° C).
c. The tires should be under inflated 2.0 psig for each 10° F (5.56° C) above 70° F (21.1° C).
d. Refer to Chapter 12-10-06 for detailed inflation procedures.
MAIN GEAR WHEELS AND TIRES REMOVAL/INSTALLATION
MAIN LANDING GEAR WHEEL AND TIRE ASSEMBLY REMOVAL
FIGURE 201
a. Raise the airplane until the clearance between the and ground is a minimum of 5 in (127 mm). Refer to Chapter 7-10-01, JACKING.
b. Cut the lockwire and loosen three screws (1) and washers (2). Remove hub cap (3).
c. Cut the lockwire and loosen two bolts (4) and washers (5). Remove the axle nut (6) and retaining washer (7).
d. Remove wheel and tire assembly (8), bearing cups (9 and 10), bearing cones (11 and 12) and bearing seals (13 and 14) from the axle
shaft (15).
Caution: Dry-cleaning solvents are toxic and volatile. Use in a well-ventilated room. Avoid contact with skin or clothing. Do not inhale
vapors.
e. Clean all metal parts which removed above steps (b) through (d) with dry-cleaning solvent ( 9, Chart 2, 32-00-00). A soft bristle brush may
be used to remove hardened grease, dust or dirt.
f. Clean the bearing cones (11 and 12) in a separate clean container to avoid contamination.
Caution: Do not spin bearings with compressed air.
g. Dry bearing cones (11 and 12) thoroughly using filtered and dried compressed air.
Note: Examine and repack bearing cones (11 and 12) and bearing cups (9 and 10) with clean bearing grease ( 5, Chart 2, 32-00-00)
immediately after drying.
New bearing cones and bearing cups packaged in preservative need not be degreased prior to use, as the preservative is
compatible with the recommended grease.
h. Wash rubber parts in isopropyl alcohol ( 10, Chart 2, 32-00-00) and dry with a clean, soft cloth.
TIRE REMOVAL
Warning: Do not attempt to disassemble wheel until tire has been completely deflated. Otherwise, serious injury to personnel or
damage to equipment can result.
Caution: Disassemble wheel on a tire changer or a clean, flat surface. Be careful not to nick, scratch or scuff the paint or protective finish
from the wheel halves.
a. Remove valve cap (16) from inflation valve, and release tire pressure completely.
Caution: Do not attempt to remove valve core (17) until tire has been completely deflated. Valve core will be ejected at high velocity if
unscrewed before air pressure has been released.
b. Remove valve core (17) from valve stem (18).
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Maintenance Manual (Rev B4)
32-41-01 (Rev Dec 16/02)
Caution: Do not pry between wheel flange and tire beads to separate the tire from wheel flange as this could damage the wheel and tire.
c. Break tire beads free of both wheel flanges by applying pressure in even increments around entire side wall as close to tire beads as
possible.
Warning: Injury to personnel can result from explosive separation of wheel components if wheel bolt nuts are removed while tire
still contains air pressure.
Caution: Do not use impact or power wrenches to remove wheel bolts or nuts.
d. Remove self-locking nuts (19), washers (20), wheel bolts (21) and countersunk washers (22) from the wheel and separate the wheel
subassemblies (23 and 24).
e. Remove tire from wheel.
Note: It is recommended that a new O-ring wheel packing should be installed at each overhaul. If packing must be reused, mark
position of packing with respect to wheel half so that packing can be reinstalled in same position. Carefully remove packing
and place on a clean, flat surface.
f. Remove O-ring wheel packing (25) from wheel register.
Caution: Dry-cleaning solvents are toxic and volatile. Use in a well-ventilated room. Avoid contact with skin or clothing. Do not inhale
vapors.
g. Clean all metal parts removed in above steps (a) through (f) with dry-cleaning solvent ( 9, Chart 2, 32-00-00). A soft bristle brush may be
used to remove hardened grease, dust or dirt.
h. Wash rubber parts in isopropyl alcohol ( 10, Chart 2, 32-00-00) and dry with a clean, soft cloth.
TIRE INSTALLATION
Caution: Assemble wheel on a clean, flat surface. Be careful not to nick, scratch or scuff the paint or protective finish from the wheel
halves.
a. Check tire for word "TUBELESS" on side wall.
b. Before mounting, make sure that tire is free of foreign material and that bead areas are clean. With emphasis on bead area, visually check
tire for shipping or handling damage.
c. To remove foreign matter, wipe wheel bead seat, tube well and wheel register areas with a clean cloth dampened with isopropyl alcohol (
10, Chart 2, 32-00-00).
d. Clean O-ring wheel packing (25) with isopropyl alcohol ( 10, Chart 2, 32-00-00) and lubricate with a slight coat of grease.
Caution: Packing should be equalized on wheel and not twisted. If packing is to be reused, it should be installed as close as possible to its
original position.
e. Place outboard wheel half (23) with flange down on a flat surface and install O-ring wheel packing (25) in register groove.
f. Place tire on wheel half (23) with red balance dot down and locate at valve stem.
g. Position inboard wheel half (24) in tire so that the bolt holes in both wheel halves are aligned.
h. Lubricate wheel bolts (21), self-locking nuts (19), threads and contacting surfaces of bolt heads, washers (20 and 22) and self-locking nuts
(19) with antiseize compound ( 8, Chart 2, 32-00-00).
i. Install countersunk washers (22) on bolts (21) with countersunk against to the bolt thread.
j. Install bolts with washers through the inboard wheel half (24) and outboard wheel half (23); secure with washers (20) and self-locking nuts
(19).
Caution: Do not use impact or power wrenches to tighten the wheel bolts or nuts.
k. Tighten self-locking nuts (19) evenly in a criss-cross pattern in increments of 8 ft-lbs (10.847 kg-m) to a final torque value of 25 ft-lbs
(33.896 kg-m).
l. Install valve core (17) in valve stem (18).
Warning: Place wheel in an inflation cage for initial inflation before seating beads. Tire and/or wheel failure may occur causing injury
to personnel or damage to equipment if tire is overinflated from any high-pressure source. Tire and wheel assemblies must
be used with inflation equipment specifically designed for this operation.
m. Inflate the tire with just enough nitrogen to seat the beads. Refer to Chapter 12-10-06.
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Maintenance Manual (Rev B4)
32-41-01 (Rev Dec 16/02)
n. Reduce tire pressure to recommended storage pressure and remove wheel assembly from the inflation cage.
o. Install the valve cap (16) on the valve stem (18).
p. Put the slip mark on the tire side wall and wheel rim.
Note: Lubrication of bearings by mechanical or other pressure methods is recommended because it is more efficient, reduce the
possibility of the contamination, and assures more even distribution of grease within the bearing.
q. Pack bearing cones (11 and 12) and coat bearing cups (9 and 10) and lips of bearing seals (13 and 14) with bearing grease ( 5, Chart 2,
32-00-00).
Caution: Handle bearing cones with extreme care. Many bearing failures result from mishandling during maintenance.
r. Install bearing cones (11 and 12) and bearing seals (13 and 14) into wheel assembly.
Note: Cover hub bearings to protect bearings from dirt and moisture contamination until wheel assembly is installed on airplane.
MAIN LANDING GEAR WHEEL AND TIRE ASSEMBLY INSTALLATION
Note: Check the condition of tire, wheel, bearing, seal, axle and brake before installing the wheel and tire assembly on the
airplane.
a. Put the wheel and tire assembly on the axle shaft (15) and install retaining washer (7) and axle nut (6).
b. Tighten axle nut (6) torque to 100 in-lbs (115.2 kg-cm) while manually rotating wheel assembly.
c. Back off axle nut (6) to 0 in-lbs (0 kg-cm) but all parts must be still seated.
d. Re-tighten axle nut (6) torque to 50 in-lbs (57.6 kg-cm) while manually rotating wheel assembly.
Note: If the axle nut lock groove is not matching with the axle shaft lock hole, advance the axle nut to the nearest locking
position but tightening torque should not exceed 100 in-lbs (115.2 kg-cm).
e. Rotate the wheel speed transducer (26) to match with lock hole of axle shaft and lock the axle nut (6) with bolts (4) and washers (5) torque
18 to 20 in-lbs (21 to 23 kg-cm).
f. Install lockwire on bolts (4).
g. Match the hub cap (3) drive clip ( 29, Chart 1, 32-00-00) slit to the wheel speed transducer (26) driven clip, secure hub cap (3) on the
wheel assembly with screws (1) and washers (2).
h. Install lockwire on screws (1).
i. Lower the airplane. Refer to Chapter 7-10-01, JACKING.
MAIN GEAR WHEELS AND TIRES INSPECTION/CHECK
INSPECT TIRE
a. Inspect the tire for excessive wear, damage or deterioration.
1. Removal criteria for tire part number 038-673-1 is defined as tread worn to the bottom of the center most groove or at the first exposure
of fabric in the tread area. The tire should be removed from service when either case occur.
b. Check the tire for proper inflation; service with nitrogen ( 31, Chart 1, 32-00-00).
INSPECT WHEELS
a. Inspect for cracks, scratches or other damage. Replace cracked parts.
b. Check O-ring for damage or excessive deformation. Replace if necessary.
c. Check the bearing cone rollers for wear, overheat or corrosion. Check the roller retainer for damage, replace of necessary.
d. Check the hub cap for wear. Replace if necessary.
e. Check the wheel half bolts, for cracks, deformations and corrosion. Replace if necessary.
f. Replace self-locking nuts for wheel half attaching bolts if the self-locking nuts can be run all the way down by hand on the wheel half bolts
during reassembly.
HUBCAP INSPECTION
FIGURE 202
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Maintenance Manual (Rev B4)
32-41-01 (Rev Dec 16/02)
This inspection must be performed every time the main landing gear hubcap is removed.
a. Inspect the hupcap for damage, wear and cracks.
b. Inspect the drive clip for wear, cracks, evidence of damage and security to the hubcap.
c. Ensure that the drive clip gap does not exceed 0.20 inch (5.1 mm).
d. If required, the drive clip may be adjusted as necessary to maintain the proper gap.
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Maintenance Manual (Rev B4)
32-41-01 (Rev Dec 16/02)
Figure 201 : Sheet 1 : Fig 201 - MLG Wheel/Tire Installation
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Maintenance Manual (Rev B4)
32-41-01 (Rev Dec 16/02)
Figure 201 : Sheet 2 : Fig 201 - MLG Wheel/Tire Installation
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Maintenance Manual (Rev B4)
32-41-01 (Rev Dec 16/02)
Figure 202 : Sheet 1 : Fig 202 - Hubcap Inspection
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