Piper PA-34-200T Seneca II, Service Manual

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PIPER SENECA II SERVICE MANUAL
7-46. BEARING CUP REPLACEMENT
a. Removal:
1. Insert wheel half into boiling water for 15 minutes or place in an oven not exceeding 250° F
(121°C) for 15 minutes.
2. 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.
b. Installation:
1. To replace a new cup, apply one coat of fluid resistant epoxy primer to wheel half bearing
bore.
NOTE: Never paint working surfaces of the bearing cups.
2. 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.
3. Remove wheel half from source of heat and bearing cup from the dry ice. Install the chilled
bearing cup into the bearing bore of the heated wheel half. Tap gently to seat evenly in place,
using a fiber drift pin or suitable arbor press.
7-47. INSPECTION OF MAIN WHEEL ASSEMBLY.
Inspection of the main wheel assembly is the same as that given for the nose wheel. Paragraph 7-43.
7-48. ASSEMBLY AND INSTALLATION OF MAIN WHEEL. (Refer to Figure 7-13.)
a. Determine that the bearing cup (10) is properly installed in each wheel half.
b. Install the inner tube in the tire, making certain to align the index marking on the tire with the index
marking on the tube, to ensure proper wheel balance.
c. Install the tire and tube on the wheel half with the valve stem hole, inserting the valve stem through
the valve hole.
d. Place the opposite wheel half inside the tire. Align the wheel bolt holes. Position the brake disc (3) in
the inner wheel half and install the wheel bolts (9) with nuts on the valve stem side. Tighten (draw
up) the bolts in a criss-cross fashion. Torque the nuts to 150 inch-pounds and inflate the tire to 70 psi
to seat the tire bead, then deflate the tire to proper inflation. (Refer to Section II, Table II-I.)
e. Lubricate bearing cones (11) and install cones, felt grease seals (14) and grease seal rings (12 and
15). Secure with snap rings (13).
f. Slide wheel on the axle and secure with axle nut. Tighten nut sufficiently to prevent side play, yet
allow the wheel to rotate freely. Reinstall the dust cover (6).
g. Position brake lining back plates between the wheel and brake disc and the brake cylinder on the
torque plate. Insert spacer blocks between the back plates and cylinder, and install four bolts to
secure the assembly. If the brake line was disconnected, reconnect the line and bleed the brakes.
7-49. BRAKE SYSTEM.
7-50. WHEEL BRAKE ASSEMBLY.
Adjustment of brake lining clearance is unnecessary since they are self-adjusting. Inspection of the
lining is necessary and may be inspected visually while installed on the airplane. The linings are of the
riveted type and should be replaced if the thickness of any one segment becomes worn below .099 of an
inch or if signs of uneven wear are evident.
VII - LANDING GEAR AND BRAKE SYSTEM 01/01/09
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