Figure 4-73. Axle with brake system parts, removed.
mounting nuts, and washers, and actuator from
a. Removal. Block and hold the vehicle by chock
(b) Let the actuator hang free by its hoses and
actuate the tractor protection valve, then drain tractor
(1) To remove the actuator in a locked condition
reservoir. Vehicle will be held by wheel chocks.
when the trailer is disconnected.
(a) Completely drain trailer reservoir.
(c) Disconnect hoses from actuator and
(b) Remove delivery and lock port lines from
actuator (fig. 4-79).
(c) Back off slack adjuster or actuator
mounting nuts until sufficient force has been displaced
Safety actuator must be installed with the
to permit removal of the yoke pin from the clevis (fig.
drain slot pointing down.
(d) Completely remove actuator mounting nuts
(1) With shaft in fully released position, mount
and remove actuators.
actuator to mounting bracket and tighten securely.
(2) To remove the safety actuator in an unlocked or
(2) Fasten actuator push rod yoke to slack adjuster
(a) With the actuator in the released position
with yoke pin. Lock yoke pin with cotter pin.
and the tractor and trailer connected, remove yoke pin,