Introduction To Hydraulic Schematic Symbols; Basic System Operation - jcb 214e Service Manual

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Section E
3 - 10
Introduction to Hydraulic Schematic
Symbols
Complex hydraulic components and circuits can be
described to the engineer by using graphical symbols. The
following pages illustrate and give a brief description for
some of the more common symbols used.
There are many symbols in use and it would be impossible
to include them all here. However it should be noted that
most are only variations or refinements on the basic
principles explained here. If more detailed information is
required you are recommended to obtain a copy of BS2917
or IS01219.
Once familiar with the symbols, the engineer can use
hydraulic circuit diagrams as an aid to fault finding. It will be
possible to see the complete hydraulic circuit and decipher
the relationship between hydraulic components.
General (Basic & Functional Symbols)
Spring
Flow restriction
affected by viscosity
Direction of flow
Indication of rotation
Indication of direction
and paths of flow
Variable control
Rams
9803/3280
Hydraulics

Basic System Operation

A189660
Single acting
Double acting
Double ended
Double acting with
damping at rod area end
A189670
Purchased from www.WorkshopManuals.co.uk
Pumps & Motors
Variable capacity pump
two directions of flow
Fixed capacity motor
one direction of flow
Fixed capacity motor
two directions of flow
Variable capacity motor
one direction of flow
Variable capacity motor
two directions of flow
Section E
3 - 10
A189680
Issue 1