Hydraulic lines and fittings are not ordinarily removed except for replacement. Bent, kinked, or damaged
rigid lines or fittings must be replaced. Frayed, deteriorated, and broken or cut flexible lines must be replaced.
All lines must be tightly attached and connected.
(1) Disconnect slack adjuster (fig. 4-39) from air chamber push rod by removing cotter pin and clevis
(2) Remove snap ring from splined end of brake camshaft extending through slack adjuster.
(3) Remove washer and slide off slack adjuster.
(1) Coat splined end of brake camshaft with light film of oil and slide slack adjuster into position. A
slight rotary motion of slack adjuster as it reaches camshaft splines wiII allow splines in adjuster
to mesh with splines on camshaft. Install washer and snap ring on camshaft (fig. 4-39).
(2) Connect slack adjuster to yoke of air chamber with 1/2 X 1-13/64-inch clevis pin and 1/8 X 7/8
inch cotter pin.
(3) Adjust brakes (para. 4-39a(2) ).
(1) Unscrew connector nut at rear of air hose coupling (fig. 2-6) and slide nut back on air line tubing.
(2) Unscrew nut at front of crossmember, until pressure has been relieved on Iockwasher.
(3) Unscrew nut (back of crossmember) on nipple connecting air line tubing to coupling.
(4) Withdraw air hose coupling, with nipple, from front crossmember.
(5) Remove nut, Iockwasher, and tag from nipple. Separate coupling and nipple.
b. Cleaning and Inspection. Clean with dry cleaning solvent (PD-680) (item 18, Appendix C). Check
for damage to air hose coupling.
Cleaning solvent (Fed Spec PD-680) is both toxic and flammable. Avoid
prolonged breathing of vapors. Avoid skin contact. Use only in well-ventilated
area. Keep away from open flame.
(1) Apply pipe compound to threads at ends of nipple. Screw nipple into air hose coupling and install
nut and Iockwasher on nipple.
(2) Position tag over opening in front crossmember and insert assembled coupling and nipple through
tag and opening.
Make certain tags are on proper lines. The tag marked SERVICE must be on
right side coupling. The tag marked EMERGENCY must be on left side coupling.