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Section 1 - General Information
1 - 31
1 - 31
9803/4180-08
Terms and Definitions
Colour Coding
Hydraulic Schematic Colour Codes
T11-006
The following colour coding, used on illustrations to denote
various conditions of oil pressure and flow, is standardised
throughout JCB Service Publications.
Red
Full Pressure:
Pressure generated from operation of a service. Depending on application this
may be anything between neutral circuit pressure and MRV operating pressure.
Pink
Pressure:
Pressure that is above neutral circuit pressure but lower than that denoted by Red.
Orange
Servo:
Oil pressure used in controlling a device (servo).
Blue
Neutral:
Neutral circuit pressure.
Green
Exhaust
Light Green
Cavitation:
Oil subjected to a partial vacuum due to a drop in pressure (cavitation).
Yellow
Lock Up:
Oil trapped within a chamber or line, preventing movement of components (lock up).
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