Assembly And Installation Of Main Wheel; Bearing Cup Replacement - Piper APACHE PA-23-235 Service Manual

a. Bearing Cup Replacement:
1. Heat wheel half in boiling water for one hour, or in an oven not exceeding
250°F (121
°
C) for 30 minutes.
2. Remove wheel half from source of heat. Bearing cup should be loose enough to
fall out of the bearing bore when wheel half is inverted. If the cup does not drop out, tap
evenly from bore with a fiber drift pin.
3. To install new bearing cup, repeat step 1, and chill the bearing cup in dry ice.
4. Remove wheel half from source of heat and bearing cup from dry ice.
5. Dry chilled bearing cup and coat contacting surface with zinc chromate primer.
6. Install the chilled bearing cup in the heated wheel half. Tap gently and evenly
into place, using a fiber drift pin or suitable arbor press.
b. Repainting of of Main Wheel Repaired Surfaces:
1. Thoroughly clean any repaired surfaces and areas of the wheel from which paint
has been removed.
2. Paint the exposed areas with one coat of primer and one coat of aluminum
lacquer.
CAUTION
Never paint the working surfaces of the bearing cups.
7-56. ASSEMBLY AND INSTALLATION OF MAIN WHEEL. (Refer to Figure 7-22.)
a. Ascertain that the bearing cup (3) in each wheel half (1 and 2) is fully seated in the
wheel housing. Install the through bolts with the bolt heads opposite the brake disc side and
torque to 90 inch-pounds. Inflate the tire. (Refer to paragraph 7-76 for Tire Balancing.)
NOTE
Visually inspect thread protrusion on assembled and torqued
wheel assembly. Thread protrusion should be flush to .125
maximum. Bolts that are below flush or beyond maximum
should be replaced with P/N AN4-7A tie bolt (Refer to figure
7-22).
b. Lubricate the bearing cones (4). Install cone, grease seal (9) and seal washers (8) in
inner wheel half (2) and secure with lock ring (10).
c. Place the wheel on the axle and install axle nut. Tighten to allow the wheel to run
free yet not fit loose on the axle. Safety nut and install the hub cap (1 1) and dust cover (12)
securing with lock rings (10 and 13).
d. Install the brake assembly by installing the brake cylinder on the torque plate,
positioning the spacer, lining back plate, and installing the six bolts securing assembly. If the
brake line was disconnected, reconnect and bleed brakes.
LANDING GEAR AND BRAKE SYSTEM
Reissued: 218 81
215
PIPER AZTEC SERVICE MANUAL