Hydraulics
9803/7130 Issue 1
7 - 1 7 - 1
Circuit Descriptions
Section E Section E
Excavator Valve Neutral Circuit
Component Key: (JCB 'X' Control Pattern)
A Inlet
B Load Hold Check Valves
X Parallel Gallery
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.
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 X but is not
at a high enough pressure to open the load hold check
valves B.
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