The ornamental design for a yoke for an automaticslack adjuster, as shown and described.
FIG. 1 is a right perspective view of a yoke for an automatic slack adjuster according to our novel design, the left perspective view being mirror symmetrical;
FIG. 2 is a right side view thereof, the left side view being mirror symmetrical;
FIG. 3 is a front view thereof; and
FIG. 4 is a rear view thereof.
FIG. 5 is a right perspective view of the yoke for an automatic slack adjuster according to our novel design shown in an alternate environment of use, the left perspective view being mirror symmetrical;
FIG. 6 is a right side view thereof, the left side view being mirror symmetrical;
FIG. 7 is a front view thereof; and,
FIG. 8 is a rear view thereof.
The broken line drawing is for the purpose of depicting alternate environments only and forms no part of the claimed design.