New Holland PL6011, Service Manual

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Hydraulic systems - Hydraulic systems
Pilot or control lines (A) are broken into long dashes.
Drain lines (B) for leakage oil are broken into short
dashes.
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A flexible line is shown as an arc between two dots and is
always represented by a solid line.
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An enclosure outline indicates that there are several sym-
bols that make up a component assembly such as a valve
or a valve stack. The enclosure outline is rectangular and
is broken with dashes on all sides.
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Lines between components are drawn differently when
they are crossing or connected. There are lines that cross
other lines but are not connected. There are several ways
to show crossing lines which are not connected.
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Lines that are connected are shown with a dot that repre-
sents the connection or shown as a tee connection. The
dot connection is the most commonly used when drawing
schematic diagrams.
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Pumps
There are many basic pump designs. A simple fixed dis-
placement pump
(A) is shown as a circle with a solid ar-
row that pointing outward. The arrow points in the direc-
tion that the fluid flows. If the pump is reversible
(B) or
designed to pump in either direction, the symbol has two
arrows which point in opposite directions. The pump nor-
mally has a pressure port and line
(1) from which pressur-
ized fluid is discharged and a suction port and line (2) into
which fluid is drawn from the reservoir.
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