Piper PA-24 Comanche, Service Manual

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PIPER COMANCHE SERVICE MANUAL
04/01/09 VI - LANDING GEAR AND BRAKE SYSTEM
1K11
6-76.
Assembly and Installation of Main Wheel
. (Goodrich) PA-24-400 (Refer to Figure 6-27 )
a. To assemble the main wheel, mount the tire and tube on the wheel and inflate the tube slightly to
prevent pinching
b. Install the tie bolts (7). instruction plate washers and nuts and torque the bolts to the specification
given on the instruction plate.
c. Ascertain that the bearing cup (3) is properly installed.
d. Lubricate the wheel bearings (4) and install with the grease seals (6) and seal retainers (5)
e. Install the torque key (14), disc retainer (15) and safety.
f. Install wheel assembly on axle and secure with nut and cotter pin.
g. Install dust cover (II) and secure with snap ring (12).
6-77.
Brake System
.
6-78.
Removal and Disassembly of Wheel Brake Assembly.
(Cleveland 3000-250 (30-12)) PA-24-180 and
PA-24-250, S/N’s 24-1 thru 24-3295. (Refer to Figure 6-28.)
a. To remove the brake assembly, disconnect the brake line from the brake cylinder (12) and cap it to
prevent contamination.
b. Remove the four cap bolts (22) that join the brake cylinder housing (12) and the lining back plate
assemblies (2). Remove the back plates from between the brake disc and wheel.
c. Slide the brake cylinder housing from the torque plate.
d. Remove the adjustment nut (21) and washer and the retraction spring (19) and sleeve (18) from the
cylinder housing.
e Slide the pressure plate (7) and lining off the anchor bolts (11) of the cylinder housing.
f The pistons (8) may be removed by injecting low air pressure in the cylinder fluid inlet and forcing
the pistons from the housing
g. The lining (6) can be removed from the pressure plate (7) and back plate (2) by removing the
attaching rivets.
6-79.
Cleaning, Inspection and Repair of Wheel Brake Assembly.
a. Clean the assembly with a suitable solvent and dry thoroughly.
b. Check the walls of the cylinder housing and pistons for scratches, burns, corrosion, etc., that may
damage "O" rings.
c. Check the general condition of the brake bleeder screw and lines.
d. Check the brake disc for grooves, scratches or pits. A single groove or isolated grooves up to .031
of an inch deep would not necessitate replacement, but a grooving of the entire surface would
reduce lining life and should be replaced. Should it be necessary to remove the wheel disc, refer to
Paragraph 6-87.
e. Lining may be removed from the backing plates by drilling or punching out the old rivets, and
installing a new set using the proper rivets and a rivet set that will properly stake the lining and form
a correct flair of the rivet.
NOTE: Linings should be replaced when the thickness of any one segment is 3/32 inch or less, or
the lining is worn uneven.