Colour Coding
The following colour coding, used on illustrations to denote various conditions of oil pressure and flow, is standardised
throughout JCB Service publications.
9803/3280 Issue 1
A390940
Full Pressure
Pressure generated from operation of a service. Depending on application this may
be anything between neutral circuit pressure and M.R.V. operating pressure.
Pressure
Pressure that is above neutral circuit pressure but lower than that denoted by red.
Servo
Oil pressure used in controlling a device (servo).
Neutral
Neutral circuit pressure.
Exhaust
Cavitation
Oil subjected to a partial vacuum due to a drop in pressure (cavitation).
Lock Up
Oil trapped within a chamber or line, preventing movement of components (lock up).
Red
Pink
Orange
Blue
Green
Light
Green
Yellow
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