The primary purpose of a graphic (schematic)
diagram is to enable the maintenance person to
trace the flow of fluid from component to
component within the system. This type of
diagram uses standard symbols to show each
component and includes all interconnecting
piping. Additionally, the diagram contains a
component list, pipe size, data on the sequence
of operation, and other pertinent information.
The graphic diagram (fig. 12-3) does not indi-
cate the physical location of the various com-
ponents, but it does show the relation of each
component to the other components within the
Figure 12-3.Graphic diagram of LST 1182 class hydraulic steering gear.