Assembly Of Brake Master Cylinder; Installation Of Brake Master Cylinder; Removal Of Parking Brake Valve; Assembly Of Parking Brake Valve - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
7-60. ASSEMBLY OF BRAKE MASTER CYLINDER. (Refer to Figure 7-23.)
a. Install O-ring (9) on the cylinder piston (8). Assemble onto the piston rod (12), the piston (8),
spring (7), washer seal (6) and valve (5). Allow the valve to extend into the base of the piston. Slide the
O-ring and washer (3) in place and secure with self-locking nut (2).
b. Install O-ring seal (14) on the packing gland (15). Onto the piston rod (12), slide spring (10),
washer (11), O-ring (13) and packing gland (15).
c.
Dip the piston assembly in fluid (MIL-H-5606) and install the assembly into the cylinder (1).
Push the packing gland into the cylinder until the snap ring (16) can be installed into the annular slot at the
bottom of the cylinder.
7-61. INSTALLATION OF BRAKE MASTER CYLINDER.
a. Compress the piston within the cylinder and adjust the clevis end of the piston rod to obtain 6.69
inches between attachment holes of the cylinder body and the piston rod clevis. Lock clevis in position
with locknuts.
b. Attach the cylinder to the rudder pedal by securing at the cylinder body with bolt assembly and
at the clevis with clevis pin.
c. Connect the fluid lines to the cylinder.
7-62. PARKING BRAKE VALVE.
7-63. REMOVAL OF PARKING BRAKE VALVE.
a. Disconnect the parking brake cable from the valve actuating arm.
b. Disconnect the fluid lines from the valve.
c. Remove the screws that attach the valve to its mounting bracket.
d.
Place a protective material over the line openings to prevent contamination of the system.
7-64. DISASSEMBLY OF PARKING BRAKE VALVE. (Refer to Figure 7-24.)
a.
Remove the two fittings (2) from the outside of the valve body (1). A valve spring (3) is held in
place by the fittings. Use caution not to loosen these when removing the fittings.
b.
From the valve body, remove the valve spring (3) and valve (4).
c. To remove the valve cam (13), remove the nut (6), washer (7), bushing (8) and spring (9) and pull
the cam from the valve body.
7-65. CLEANING, INSPECTION AND REPAIR OF PARKING BRAKE VALVE.
a. Clean the valve parts with a suitable solvent and dry thoroughly.
b. Inspect valve and seat surfaces of valve body for excessive wear and corrosion.
c. Inspect the cam assembly for burrs, scratches, excess wear, loose operating lever, etc.
d. Check general condition of valves and springs.
e. Repair to the valve is largely limited to smoothing burred or scratched surfaces and replacing
O-rings.
7-66. ASSEMBLY OF PARKING BRAKE VALVE. (Refer to Figure 7-24.)
a. Install O-rings (10, 11 and 12) on valve cam (13).
b. Lubricate O-rings with fluid (MIL-H-5606), insert cam (13) into valve body (1) and secure with
spring (9), bushing (8), washer (7) and self-locking nut (6).
c. Install O-ring (5) on valve (4), insert valve in hole of out port, install valve spring (3) and secure
with outlet fitting (2).
Reissued: 9/23/80
LANDING GEAR AND BRAKE SYSTEM
2F14