Illustration Task Sequence
Components that must be removed or installed in a specific sequence are identified with a numbered callout. Any associated step text is numbered accordingly.
Simple procedure example showing color-coding and task sequence.
Black arrows are used to draw attention to components (usually fasteners). Arrows with multiples specified (here, x2) identify an identical number of fasteners or items. Callouts (numbers inside circles) show a required sequence or tightening torque.
In the illustration, the callouts indicate the removal sequence, which is reversed for installation . The yellow coloring of the hose indicates it is to be positioned aside (not removed). Two identical (magenta-colored) fasteners are indicated by the x2 arrow. The fasteners in this illustration require different torques (same torque for the x2 fasteners) so numbered callouts are used to identify them with torque values in the associated step text. The (magenta-colored) hose clamp is another fastener to be removed.
Examples of fastener removal sequence and an identical service action for 12 fasteners. Other possible symbols are shown on the right.
Example of fastener sequence information with two persons required for the service action