Brake Adjustment And Lining Tolerance; Wheel Brake Assembly Removal And Disassembly - Piper PA-44-180 SEMINOLE Maintenance Manual

1. 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 zinc chromate primer to wheel half bearing bore.
(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 gearing bore of the heated wheel half. Tap gently to seat evenly in place, using a fiber drift
pin or suitable arbor press.
BRAKES.

BRAKE ADJUSTMENT AND LINING TOLERANCE.

No adjustment of the brake lining clearance is necessary as they are self-adjusting. Inspection of the lining is
necessary, and it may be inspected visually while installed on the airplane. Linings of the riveted type should be
replaced if the thickness of any one segment becomes worn below . 100 of an inch or unevenly worn. The "snap-
on" heavy duty linings should be replaced when the expansion groove is no longer visible.
WHEEL BRAKE ASSEMBLY.
REMOVAL AND DISASSEMBLY OF WHEEL BRAKE ASSEMBLY. (Refer to Figure 32-15.)
1. To remove the brake assembly, first disconnect the brake line from the brake cylinder at the tube fitting.
2. Remove the cap bolts that join the brake cylinder housing and the lining back plate assembly. Remove the
back plate from between the brake disc and wheel.
3. Slide the brake cylinder housing from the torque plate.
4. Remove the pressure plate by sliding it off the anchor bolts of the housing.
5. The piston(s) may be removed by injecting low air pressure in the cylinder fluid inlet and forcing the piston
from the housing.
6. Check anchor bolt for wear.
7. Remove anchor bolt by the following procedure:
A. Position cylinder assembly on a holding fixture. (Refer to Figure 32-16, Step A.)
B. Use a suitable arbor press to remove the anchor bolt from the cylinder body.
8. Install anchor bolt by the following procedure:
A. Support anchor bolt in a holding fixture. (Refer to Figure 32-16, Step B.)
B. Align cylinder body over anchor bolt. (Refer to Figure 32-16, Step C.)
C. Use a suitable arbor press and apply pressure on the spot face directly over the anchor bolt hole. (Refer
to Figure 32-16, Step D.)
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
2H11
3 2 - 4 4 - 0 3
Page 32-43
Revised: May 15, 1989