Main Wheel Removal And Installation; Main Wheel Inspection; Main Wheel Assembly And Installation - Piper PA-44-180 SEMINOLE Maintenance Manual

On aircraft models which use the Cleveland Wheel Assembly torque nuts to 90 inch-
pounds. Those aircraft models which use the McCauley Wheel Assembly torque nuts
to 140-150 inch-pounds.
On McCauley Nose Wheel Assemblies only, bushing is required to prevent tube
movement.
2. Position the tire and tube so the index mark on the tire is aligned with the index mark on the tube. This will
maintain proper balance of the wheel. Inflate the tire to the specified pressure as given in Chart 600 1 .
3. Lubricate the bearing cones and install the cones, grease seals, felt rings and seal retainer rings. Secure with
snap rings.
4. Install the axle and spacer into the wheel assembly and install the wheel into the fork of the strut assembly.
Secure in place with an axle plug on each end, axle rod, washers and self-locking nuts. Tighten the nuts until
no side play is felt, yet allowing the wheel to rotate freely.
MAIN WHEEL.
REMOVAL AND DISASSEMBLY OF MAIN WHEEL. (Refer to Figure 32-14.)
1. Place the airplane on jacks. (Refer to Chapter 7.)
2. To remove the main wheel, remove the four cap bolts that join the brake cylinder housing and the lining
back plate assemblies. Remove the back plate from between brake disc and wheel.
3. Remove the dust cover and the cotter pin that safeties the wheel nut, remove the wheel nut and slide the
wheel from the axle.
4. The wheel halves may be separated by first deflating the tire. With the tire sufficiently deflated, remove the
wheel through bolts. Pull the wheel halves from the tire by removing the inner half from the tire first, and
then the other half.
5. The wheel bearing assemblies may be removed from each wheel half by first removing the snap rings that
secure the grease seal retainers, and then the retainers, grease seals and bearing cones. The bearing cups
should not be removed only for replacement and may be removed by tapping out evenly from the inside.
INSPECTION OF MAIN WHEEL.
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.
In addition also perform the same inspection given for nose wheel.
ASSEMBLY AND INSTALLATION OF MAIN WHEEL. (Refer to Figure 32-14.)
1. Ascertain that the bearing cup for each wheel is properly installed. Install the tire with tube on the outer
wheel half and then join the two wheel halves. Position the brake disc in the inner wheel half and install the
through bolts with the nuts on the valve stem side. Torque wheel nuts to 150 inch-pounds.
2. Position the tire and tube so the index mark on the tire is aligned with the index mark on the tube. This will
maintain proper balance of the wheel. Inflate the tire to the specified pressure.
3. Lubricate the bearing cones and install the cones, grease seals~ seal retainer rings and felt rings. Secure
with snap rings.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— Note —
2H9
3 2 - 4 2 - 0 3
Page 32-41
Revised: May 15, 1989