New Holland PL6011, Service Manual

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Hydraulic systems - Hydraulic systems
Lines connected to the reservoir usually are drawn from
the top, regardless of where the actual connection is. This
symbol shows a line which returns fluid above the level in
the reservoir.
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If the hydraulic line returns fluid below the level in the
reservoir, it is drawn all the way to the bottom of the sym-
bol.
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A hydraulic line connected to the bottom of the reservoir
may be drawn from the bottom of the symbol if the bottom
connection is essential to the systems operation.
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If the pump inlet (B) must be charged or flooded with fluid
above the inlet port, the reservoir symbol (A) appears
above the pump symbol, and the suction line is drawn out
of the bottom of the reservoir symbol.
Every system reservoir has at least two hydraulic lines
connected to it, and some may have many more. Often
the components that are connected to the reservoir are
spread all over the schematic. Rather than multiplying
lines all over the schematic, individual reservoir symbols
are drawn close to the components. The reservoir is usu-
ally the only component symbol pictured more than once
on a diagram.
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Lines, tubes and hoses
A hydraulic line, tube, hose or any conductor that carries
the fluid between components is shown as a line. A work-
ing line, such as an inlet pressure or return, is shown as
a solid line.
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Working lines with arrows show direction of flow. In the
first example
(A) , fluid flows in one direction only; in the
second example (B) , fluid can flow in both directions.
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