Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 828 / 1956

PAGE 2
Feb 28/07
4F2
32-40-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(3) Slide the wheel on the axle. While rotating the wheel, tighten the axle nut from 17 to 25 inch-
pounds. Back off the nut to reduce torque to zero. While rotating the wheel, tighten the axle nut
from 10 to 15 inch-pounds. Rotate the axle nut to align the nearest slot with the cotter pin hole.
Install the cotter pin.
C. Inspection
(1) Visually check all parts for cracks, distortion. defects and excess wear.
(2) Check tie bolts for looseness or failure.
(3) Check internal diameter of felt grease seals. Replace the felt grease seal if surface is hard or
gritty.
(4) Check tire for cuts, internal bruises and deterioration.
(5) Check bearing cones and cups for wear and pitting. Then lubricate.
(6) Replace any wheel casting having visible cracks.
2. Main Wheel Assembly (See Figure 2.)
A. Removal and Disassembly
(1) Place the airplane on jacks (refer to Jacking, 7-10-00).
(2) To remove the main wheel, remove the 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, the cotter pin and flat head pin that safeties the wheel nut, and the
wheel nut. 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 outer half.
(5) The wheel bearing assemblies may be removed from each wheel half by first removing the
retainer snap rings that secure the grease seal retainers, and then the retainers, grease seals
and bearing cone. The bearing cups should not be removed except for replacement. Refer to
Nose and Main Wheel Assembly Repairs, below, for bearing cup replacement instructions.
B. Assembly and Installation
(1) Ascertain that the bearing cup for each wheel is properly installed. Install the tire with tube and
wheel half with the valve stem hole. Ascertain that the index mark is aligned with the index
mark on the tire to ensure proper tire, tube and wheel balance. Join the two wheel halves and
position the brake disc in the inner wheel half. Install the through bolts with nuts on the valve
stem side. Torque the wheel nuts to 150 inch-pounds and inflate the tire.
(2) Lubricate the bearing cones and install the cones, grease seals and seal retainer rings. Secure
retainer with snap ring.
(3) Slide the wheel on the axle and secure with the retainer nut. While rotating the wheel, tighten
the axle nut from 17 to 25 inch-pounds torque. Back off the nut to reduce the torque to zero.
While rotating the wheel, tighten the axle nut from 10 to 15 inch-pounds torque. Rotate the axle
nut to align the nearest slot with the cotter pin hole. Install the cotter pin.
(4) Position the brake lining back plates between the wheel and brake disc and the brake cylinder
on the torque plate. Insert the spacer blocks between the back plates and cylinder, and install
the four bolts to secure the assembly. If the brake was disconnected, reconnect the line and
bleed the brakes.
C. Inspection
(1) Visually check all parts for cracks, distortion. defects and excess wear.
(2) Check tie bolts for looseness or failure.