Bearing Cup Replacement; Brake Disc Minimum Thickness; Repair Of Nose And Main Wheel Assemblies - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
475
MINIMUM THICKNESS
Figure 7-18. Brake Disc Minimum Thickness
d.
Inflate tire to recommended operating pressure per Table II-I.
e.
Place the wheel on the axle and install axle nut. Tighten to allow the wheel to turn free yet not
fit loose on the axle. Safety nut and install the hub cap (14), securing with snap ring (13).
f.
Install the brake assembly by installing the brake cylinder on the torque plate, positioning the
spacer, lining back plate, and installing the bolts securing assembly. If the brake line was disconnected,
reconnect and bleed brakes.
7-49. REPAIR OF NOSE AND MAIN WHEEL ASSEMBLIES. Repairs are limited to blending out small
nicks, scratches. gouges and areas of slight corrosion, plus the replacement of parts which are cracked or badly
corroded.
NOTE
Remove rust and blend out small nicks, using fine 400 grit
sandpaper.
Wheels may also be repainted if the parts have been repaired and thoroughly cleaned. Paint exposed areas
with one coat zinc chromate primer and one coat of aluminum lacquer.
NOTE
Never paint working surfaces of the bearing cups.
a. Bearing Cup Replacement:
1. Removal:
(a) Insert wheel half into boiling water for 15 minutes or place in an oven not exceeding
250°F (121 C) for 15 minutes.
(b) Remove from source of heat and invert wheel half. If the cup does not drop out, tap
the cup evenly from the axle bore with a fiber drift pin or suitable arbor press.
2. Installation:
(a) To replace a new cup apply one coat of zinc chromate primer to wheel half bearing
bore.
(b) Insert wheel half into boiling water for 15 minutes or place in an oven not exceeding
250°F (121°C) for 15 minutes. Chill new bearing cup in dry ice for a minimum of 15
minutes.
(c) Remove wheel half from source of heat and bearing cup from the dry ice. Install the
chilled bearing cup into the gearing bore of the heated wheel half. Tap gently to seat
evenly in place, using a fiber drift pin or suitable arbor press.
Reissued: 9/23/80
LANDING GEAR AND BRAKE SYSTEM
2F7