(2) Tighten nut (7) until hub binds on axle
b. Inspection and Repair.
spindle, then back off nut 1/8 turn. Lock in position
(1) Inspect bearing cones and cups for nicks, pit-
with lock (6) and nut (5).
ted surfaces or excessive wear.
(3) Install the wheel and tire (para 4-40).
(2) Inspect brake drum for excessive wear and
brake shoe contact points.
4-42. Service Brakes Adjustment and Bleeding
(3) Inspect remaining parts for cracks, breaks or
a. Brake Adjustment.
other damage.
( 1 ) Release pressure from the air reservoir by
(4) Discard and replace grease seal and hub cap
opening drain cock (fig. 3-5).
gaskets.
(2) Jack the trailer and block it so the wheels can
(5) Inspect studs and threaded areas for thread
be turned by hand.
damage.
(3) Turn the lower adjusting stud (fig. 4-31)
(6) Replace all defective parts.
counterclockwise until brake lining contacts brake
c. Reassemble and Installation.
drum with slight drag when drum is rotated by
(1) Reassemble and install the wheel hub and
hand. Then turn stud clockwise to allow drum to
brake drum in the reverse of numerical sequence as
rotate freely.
illustrated in figure 4-30.
Figure 4-.31. Service brake adjustment and bleeding.
b. Bleeding Brakes.
(4) Adjust the top adjusting stud in a similar
(1) General. It is necessary to bleed the air from
manner.
the hydraulic portion of service brakes if the system
is opened or a component of the system has been
(5} Adjust the opposite wheel in a similar man-
removed.
ner.
4-41
