Assembly And Installation Of Nose Wheel; Removal And Disassembly Of Main Wheel; Inspection Of Main Wheel Assemby; Assembly And Installation Of Main Wheel - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
7-45. ASSEMBLY AND INSTALLATION OF NOSE WHEEL. (Refer to Figure 7-15.)
a.
Ascertain that the bearing cup (6) in each wheel half is properly installed. Lubricate the bearing
cones (7) per lubrication chart in Section II. Reassemble the cones, grease seal retainers (8), grease seal felts
(9) and snap rings (10) into the proper wheel halves.
b.
Inflate the tube sufficiently to round it out. Install tube into tire so that balance mark (yellow or
white band) is radially aligned with the tire balance mark (red dot).
c.
Place outer wheel half into tire and pull tube valve stem through valve hole. Turn tire and outer
wheel half over and place inner wheel half into the tire and align the bolt holes with the outer wheel half.
Install bolts through the inner wheel half and washers and nuts on the outer wheel half. Torque wheel nuts
per recommended torque value on name plate of wheel.
d.
Inflate tire to recommended operating pressure per Table II-I.
e.
Flex the fork enough to allow for the installation of the wheel and spacer tubes. Insert the axle
tube, fork caps and tie bolt. Adjust the tie bolt nut to allow the wheel to turn free, yet not fit loose on the
axle.
7-46. REMOVAL AND DISASSEMBLY OF MAIN WHEEL. (Refer to Figure 7-16.)
a.
Place the airplane on jacks. (Refer to Jacking, Section II.)
b.
To remove the main wheels, remove the bolts that join brake cylinder and lining back plate
assemblies.
c.
Remove the brake assembly.
d.
Remove the snap ring (13) that secures the axle hub cap (14). Remove the cotter pin and axle
nut. Slide the wheel off the axle.
e.
The wheel may be disassembled by removing the valve core and completely deflating the tire.
Break tire bead from wheel by using a mallet. Remove the wheel through bolts (10). Separate the wheel
halves from the tire by removing the wheel half opposite the valve stem first and then the other half.
CAUTION
Do not pry between the wheel flange and tire bead with sharp
tools, as this could damage the wheel and tire.
f. Remove the bearing cone (6) by removing snap ring (9) securing the grease seal (8) and seal retainers
(7). The bearing cup (5) should be removed only for replacement. See Paragraph 7-49 for bearing cup
replacement instructions.
7-47. INSPECTION OF MAIN WHEEL ASSEMBLY. Inspect brake disc for cracks, excessive wear or
scoring, rust, corrosion and warpage. Remove rust and blend out nicks, using fine 400 grit sandpaper.
Replace disc if cracked or when disc is worn below minimum thickness. (Refer to Figure 7-18.) Ascertain
that the latest revision of Piper Service Letter 766 is complied with if applicable. In addition also perform the
same inspection given for nose wheel in Paragraph 7-44.
7-48. ASSEMBLY AND INSTALLATION OF MAIN WHEEL. (Refer to Figure 7-16.)
a.
Ascertain that the bearing cup (5) in each wheel half (1 and 2) is fully seated in the wheel
housing. Lubricate the bearing cones (6) per lubrication chart in Section II. Install cone, grease seal retainer
(7), grease seal felt (8), and snap ring (9) into the proper wheel halves.
b.
Inflate the tube sufficiently to round it out. Install tube into tire so that balance mark (yellow or
white band) is radially aligned with the tire balance mark (red dot).
c. Place outer wheel half (I) into tire and pull tube valve stem through valve hole. Turn tire and outer
wheel half (2) over and place the spacer (3) (Refer to Figure 7-16) and inner wheel half into position and align
the bolt holes with the outer wheel half and the brake disc. Install bolts through the brake disc and inner wheel
half and washers and nuts on the outer wheel half. Torque wheel nuts per recommended torque value on name
plate of wheel.
Revised: 3/11/81
LANDING GEAR AND BRAKE SYSTEM
2F6