Section 1 - General Information
Use
Hydraulic Schematic Codes
1-8
1-8
9813/3850-2
Hydraulic Schematic Codes
Colour Codes
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 LSRV operating pressure.
Pink
Pressure: Pressure that is above neutral circuit pressure but lower than that denoted by Red.
Orange
Pilot: Oil pressure used in controlling a device (Pilot).
Blue
Neural: 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).