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Attachment - Boom Up
Pressurised oil from port A2 (rear pump) enters port 4P
of the control valve. Pressurised oil from port A1 (front
pump) enters port 5P of the control valve.
When operating boom up with the hand controls, the
pilot pressurised oil flows through the cushion valve into
port 4Pb3 of the control valve and switches boom spool
(1) and boom spool (2).
Pressurised oil flows into port 4P, through the load
holding valve and into the boom ram instigating boom
up operation. Pressurised oil entering port 5P merges
with the pressurised oil from the boom spool (1) inside
the control valve and high speed can be achieved.
Section E Hydraulics
9803/6020
Section E
3 - 22
Issue 1
Schematics
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