Assembly And Installation Of Brake Assembly - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
CAUTION
Rust Veto is highly flammable. Observe all fire precautions when
using this material.
d.
Torque tube (10) repair is limited to blending out indentations in drive keys if they don't exceed
0.545 of an inch.
e.
Housing (18) repairs are as follows:
1.
Blend and polish out burrs, nicks, and scratches not deeper than 0.030 of an inch on the
outside of the housing with 320-360 grit (wet-or-dry) aluminum oxide cloth.
2.
Blend and polish out scratches in piston cavities not exceeding 0.003 of an inch deep with
fine 320-360 grit (wet-or-dry) aluminum oxide cloth. Also remove burrs and rough edges from seal grooves
to a 0.010 to 0.015 of an inch radius with 320-360 grit (wet-or-dry) aluminum oxide cloth.
f.
Piston (16) repairs consists of blending out and polishing scratches, nicks, and burrs on edges and
seal contacting surfaces of the piston to 0.003 of an inch deep. Blend repairs to avoid local indentation of
piston seal surfaces. Replace pistons damaged deeper than 0.003 of an inch.
g.
Retreating and Repainting Housing, proceed as follows:
1.
Rinse reworked areas with hot water and dry thoroughly with filtered, dried compressed air.
2.
Re-treat reworked areas with Dow No. 1 solution MIL-M-3171, Type I.
3.
Repaint reworked areas with two coats of zinc chromate primer, Specification MIL-P-8585,
and two coats of aluminum lacquer, Specification TT-L-32.
7-80. ASSEMBLY AND INSTALLATION OF BRAKE ASSEMBLY. (Refer to Figure 7-27.)
a.
Lubricate the piston O-ring packing (11), piston cylinder walls, and cylinder contacting surfaces
of the piston (10) with hydraulic fluid MIL-H-5606.
CAUTION
Assemble brake parts with care to avoid damaging.
b.
Install lubricated piston packings (11) in packing grooves in cylinders in brake housing, being
careful not to stretch or twist packings.
c.
Install insulator (9) in recess in pistons and install pistons in cylinders in housing (15). Bottom
the pistons in the cylinders.
CAUTION
To avoid damaging or displacing O-ring packings during piston
installation, a slight twisting of the piston will aid installation.
d.
Lubricate the threads of the adapter (13) and O-ring packing (14) with a light coat of hydraulic
fluid MIL-H-5606. Install the packing on the bleeder adapter and screw the adapter into the bleeder port in
the housing (15) and tighten.
NOTE
Both the inlet and bleeder ports on the housing are identical to
permit mounting the brake on either side of the airplane.
Reissued: 9/23/80
LANDING GEAR AND BRAKE SYSTEM
2G8