Hydraulics
9803/3280 Issue 1
8 - 1 8 - 1
Circuit Descriptions
Section E Section E
Excavator Valve
Component Key: (JCB 'X' Control Pattern)
A Inlet
B Parallel Gallery
C Load Hold Check Valves
4A Slew Spool
4B Boom Spool
4C Stabiliser Spool
4D Stabiliser Spool
4E Dipper Spool
4F Bucket Spool
Note: Machines with ISO control pattern have the boom and
dipper spools interchanged.
Manual Control - Neutral Circuit
Oil from the loader valve enters the excavator valve at A
and flows through the neutral gallery and around the waists
of the solid spools. It also fills the parallel gallery B but is not
at a high enough pressure to open the load hold check
valves C.
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