33 - 2
Neutral Circuit (cont’d)
Note: The following description is for that part of the neutral
circuit supplied from pump P1. The neutral circuit supplied
from pump P2 operates in a similar way.
Oil from pump P1 to the inlet port PL passes through the
neutral gallery A over each spool B and returns to tank via
the foot release valve section C.
When no spools are operated a balance of forces acting on
spool D causes it to move to the right. This allows a
pressure signal (based on neutral circuit pressure) to be sent
via port H to the pump controller, which reduces pump
output to a minimum.
Section E Hydraulics
9803/6410
Section E
33 - 2
Issue 1
Control Valve
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